<!doctypehtml><html lang=en><meta charset=utf-8><title>
   Computed Tomography (CT) Angiography (Angiogram)
  </title><link href=https://www.radiologyinfo.org/-/media/projects/radinfo/index.ashx rel=icon type=image/x-icon><link rel="shortcut icon"href=https://www.radiologyinfo.org/-/media/projects/radinfo/index.ashx type=image/x-icon><meta content="Radiological Society of North America (RSNA) and  American College of Radiology (ACR)"name=author><meta content="Current and accurate information for patients about Computed Tomography (CT) - Angiography. Learn what you might experience, how to prepare for the exam, benefits, risks and more."name=description><link href=https://www.radiologyinfo.org/en/info/angioct itemprop=url><meta content="CT Angiography (CTA)"property=og:title><meta content="Current and accurate information for patients about Computed Tomography (CT) - Angiography. Learn what you might experience, how to prepare for the exam, benefits, risks and more."property=og:description><meta content=https://www.radiologyinfo.org/-/media/radinfo/gallery-items/images/a-to-d/cta_renal-aort.ashx property=og:image><meta content=360 property=og:image:width><meta content=328 property=og:image:height><meta content=https://www.radiologyinfo.org/en/info/angioct property=og:url><meta content=Radiologyinfo.org property=og:site_name><meta content=Article property=og:type><meta content=summary property=twitter:card><meta content="CT Angiography (CTA)"property=twitter:title><meta content="Current and accurate information for patients about Computed Tomography (CT) - Angiography. Learn what you might experience, how to prepare for the exam, benefits, risks and more."property=twitter:description><meta content=https://www.radiologyinfo.org/-/media/radinfo/gallery-items/images/a-to-d/cta_renal-aort.ashx property=twitter:image><link href=https://www.radiologyinfo.org/en/info/angioct hreflang=en rel=alternate><link href=https://www.radiologyinfo.org/es/info/angioct hreflang=es rel=alternate><meta content=NOODP name=robots><meta content=https://www.facebook.com/radiologyinfo name=article:publisher><meta content=https://www.radiologyinfo.org/-/media/radinfo/gallery-items/images/a-to-d/cta_renal-aort.ashx name=thumbnail><script type=application/ld+json>
   {
  "@context": "http://schema.org",
  "@type": "MedicalWebPage",
  "lastReviewed": "2021-03-23",
  "mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "https://www.radiologyinfo.org/en/info/angioct"
  },
  "headline": "CT Angiography (CTA)",
  "specialty": "Diagnostic Radiology",
  "audience": "patients",
  "image": {
    "@type": "ImageObject",
    "url": "https://www.radiologyinfo.org/-/media/radinfo/gallery-items/images/u-to-z/woman-patient-undergoing-ct.ashx"
  },
  "datePublished": "2018-07-25",
  "dateModified": "2020-06-15",
  "author": "RSNA and ACR",
  "publisher": {
    "@type": "Organization",
    "name": "RadiologyInfo.org",
    "logo": {
      "@type": "ImageObject",
      "url": "https://www.radiologyinfo.org/-/media/radinfo/radiologyinfo_parapacientes.ashx",
      "width": 433,
      "height": 90
    }
  },
  "description": "Información actual y precisa para los pacientes sobre el ultrasonido mejorado con contraste del abdomen."
}
  </script><meta content=637713065261770783 name=VIcurrentDateTime><script src=/layouts/system/VisitorIdentification.js></script><script src=/sitecore%20modules/Web/ExperienceForms/scripts/jquery-2.1.3.min.js></script><script src=/sitecore%20modules/Web/ExperienceForms/scripts/jquery.validate.min.js></script><script src=/sitecore%20modules/Web/ExperienceForms/scripts/jquery.validate.unobtrusive.min.js></script><script src=/sitecore%20modules/Web/ExperienceForms/scripts/jquery.unobtrusive-ajax.min.js></script><script src=/sitecore%20modules/Web/ExperienceForms/scripts/form.validate.js></script><script src=/sitecore%20modules/Web/ExperienceForms/scripts/form.tracking.js></script><script src=/sitecore%20modules/Web/ExperienceForms/scripts/formsextensions.validate.js></script><meta content=width=device-width,initial-scale=1.0 name=viewport><link href=https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css rel=stylesheet><link href=/css/radinfo/radinfo.css rel=stylesheet><link href=/css/radinfo/ri-jwp.css rel=stylesheet><link href=https://www.radiologyinfo.org/en/info/angioct rel=canonical><script>(function (i, s, o, g, r, a, m) {
        i['GoogleAnalyticsObject'] = r; i[r] = i[r] || function () {
            (i[r].q = i[r].q || []).push(arguments)
        }, i[r].l = 1 * new Date(); a = s.createElement(o),
            m = s.getElementsByTagName(o)[0]; a.async = 1; a.src = g; m.parentNode.insertBefore(a, m)
    })(window, document, 'script', '//www.google-analytics.com/analytics.js', 'ga');

ga('create', 'UA-1146997-8', 'auto');
ga('send', 'pageview');</script><style>.error {
        color: #000;
    }

    #thanks {
        display: none;
       /* color: red;
       text-align: center;
        font-weight: 800;
         font-family: Cambria, "Hoefler Text", "Liberation Serif", Times, "Times New Roman", serif;
        font-size: 2.0em; */
    }

    .thanks {
       color: red;
        text-align: center;
        font-weight: 800;
        font-family: Cambria, "Hoefler Text", "Liberation Serif", Times, "Times New Roman", serif;
        font-size: 2.0em;
    }

em {padding-right: 0.15em;}

#spotlight li::before {
    content: "•";
    color: #307287;
    display: inline-block;
    width: 1em;
    margin-left: -1.25em   
}

#page-contents {
margin: -1.5em 0 1.5em;
}
#page-contents ul {
list-style: none;
padding: 0; 
}

#incontentvideo,
#video1-mobile {
margin: .5em .25em 1.5em .25em
}


.head-graphic {
    background: url(https://www.radiologyinfo.org/-/media/radinfo/radinfo%204%20kids/headshot.jpg) no-repeat;
    padding-left: 45px;
    margin: 10px 0;
    min-height: 42px
}

#kids-activities li {
position:relative; z-index:1
}</style><link href=https://www.radiologyinfo.org/en/info/angioct?google=amp rel=amphtml><body><div class=container-fluid><div style="margin-left: 0; margin-right: -20px;"class=row><header class=col-md-12><form class="navbar-form navbar-right hidden-xs"action=/search><div class=form-group><input aria-label=Search autofocus class=form-control name=searchterm placeholder=Search title=Search><button class=searchicon></button></div></form><a href=/en> <img alt="RadInfo Logo"src=https://www.radiologyinfo.org/-/media/radinfo/radiologyinfo_forpatients.ashx?h=90&w=433&la=en&hash=9BBD6D1B658BE942E2ECF7CFD001EACCC47C660B style=max-width:100%;margin-left:-15px;> </a></header></div><div class="navbar navbar-inverse"style="z-index:1; margin-left:-20px !important; margin-right: -20px !important;"role=navigation><div class=container-fluid><div class=navbar-header><button class="navbar-toggle collapsed pull-left"data-target=.navbar-collapse data-toggle=collapse type=button><span class=sr-only> Toggle navigation </span> <span class=icon-bar> </span> <span class=icon-bar> </span> <span class=icon-bar> </span></button></div><div class="navbar-collapse collapse"style="height: 1px; margin-left:5px !important;"><form class="navbar-form navbar-left search-query hidden-lg hidden-md hidden-sm form-inline"><div class=form-group><input style="width:68%; float:left;"aria-label=Search class=form-control name=q placeholder=Search title=Search><input class=searchicon name=btnG type=submit></div></form><ul class="nav navbar-nav"><li><a href=https://www.radiologyinfo.org/en> <span class="glyphicon glyphicon-home"style="font-size: 1em"> </span> </a><li><a href=https://www.radiologyinfo.org/en/test-treatment> Test/Treatment </a><li><a href=https://www.radiologyinfo.org/en/pediatric> Pediatric Care </a><li><a href=https://www.radiologyinfo.org/en/screening-wellness> Screening/Wellness </a><li><a href=https://www.radiologyinfo.org/en/disease-condition> Disease/Condition </a><li><a href=https://www.radiologyinfo.org/en/patient-safety> Safety </a><li><a class=gold href=https://www.radiologyinfo.org/es/info/angioct> En Español </a><li class=dropdown><a class=dropdown-toggle data-toggle=dropdown href=#> More Info <em class=caret> </em> </a> <ul class=dropdown-menu><li><a href=https://www.radiologyinfo.org/en/about-us> About Us </a><li><a href=https://www.radiologyinfo.org/en/downloads> Physician Resources </a><li><a href=https://www.radiologyinfo.org/en/professions> Professions </a><li><a href=https://www.radiologyinfo.org/en/article-index> Site Index A to Z </a></ul></ul></div></div></div><div class=row><div class=col-md-8 id=main><div id=main-inner><div id=share-links><a title="Facebook Share"class=share-facebook-en href=https://www.facebook.com/sharer/sharer.php?u=https://www.radiologyinfo.org/en/info/angioct target=_blank> </a><a class=share-twitter href=https://twitter.com/intent/tweet?original_referer=https://www.radiologyinfo.org/en/info/angioct?ref_src=twsrc%5Etfw&text=CT+Angiography+(CTA)&tw_p=tweetbutton&url=https://www.radiologyinfo.org/en/info/angioct target=_blank title=Twitter> </a><a onclick="if (typeof trackPDFClick === 'function') { trackPDFClick(this); }"class=view-PDF-en href=https://www.radiologyinfo.org/en/info/angioct?PdfExport=1 target=_blank title=PDF> </a></div><h1>CT Angiography (CTA)</h1><script language=javascript>function jwPlayerCallBackPlayer2() {
            var player2 = jwplayer("player2");

            player2.setup({
                file: "https://www.radiologyinfo.org/-/media/radinfo/gallery-items/videos/h264_aac/radiologistexplains/sd/ct-angiography-explained.ashx",
                image: "https://www.radiologyinfo.org/-/media/radinfo/gallery-items/videothumbs/radiologistexplains/ct-angiography-explained.ashx",
                mediaid: "d6qoQIOH",
                width: "100%",
                aspectratio: "16:9",
                skin: {
                    "name": "ri-jwp"
                },
                type: 'mp4'
            });

            player2.on('play',
                function() {
                    pausePlayers(2);
                });
        }</script><div class=row><div class="hidden-lg col-xs-12"id=video1-mobile><div id=player2></div></div></div><p class=snapshot>Computed tomography angiography (CTA) uses an injection of contrast material into your blood vessels and CT scanning to help diagnose and evaluate blood vessel disease or related conditions, such as aneurysms or blockages. CTA is typically performed in a radiology department or an outpatient imaging center.<p class=snapshot>Tell your doctor if there is a possibility you are pregnant and discuss any recent illnesses, medical conditions, medications you are taking, and allergies. You will be instructed not to eat or drink anything several hours beforehand. If you have a known allergy to contrast material, your doctor may prescribe medications to take before the CTA exam to reduce the risk of an allergic reaction. Leave jewelry at home and wear loose, comfortable clothing. You may be asked to wear a gown. If you are breastfeeding, talk to your doctor about how to proceed.<div id=incontentvideo><div class=row></div></div><div id=page-contents><ul><li><a href=#6ebc7a016af242e9847aade61626ed7f> What is CT Angiography? </a><li><a href=#e0c3196cce6a40f4abac9179ebf65ebe> What are some common uses of the procedure? </a><li><a href=#6fb9acac25264096b743f0b077e3f870> How should I prepare? </a><li><a href=#e9d3f2e55a2c47a7b73b33ddbb1a4e85> What does the equipment look like? </a><li><a href=#b981e6392cca4f0789f203a23ffdea64> How does the procedure work? </a><li><a href=#b74eccd524a64304811d3bb488fd73ae> How is the procedure performed? </a><li><a href=#546359ca2120475faefbcf172b23adc0> What will I experience during and after the procedure? </a><li><a href=#3a84c00022104980a2448b676461b281> Who interprets the results and how do I get them? </a><li><a href=#f30d4e1d138c40ea9bc69790641c1efc> What are the benefits vs. risks? </a><li><a href=#6cb1f7bc371f4edea87169ed79ca3788> What are the limitations of CT Angiography? </a><li><a href=#c6b3d6b3692a4d78aa6f329204786702> Which test, procedure or treatment is best for me? </a></ul></div><div class=sectiondiv id=6ebc7a016af242e9847aade61626ed7f><h2 class=dontsplit>What is CT Angiography?</h2><p>Doctors use angiography to diagnose and treat blood vessel diseases and conditions. Angiography exams produce pictures of major blood vessels throughout the body. <span> Some exams use  </span> <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=e0FFRjY2NDY2LTcyQUMtNDc1Ni1BNTY1LTUyMTJBRjZGQzVDQX0= title=Glossary> contrast material </a> .<p class=listleader>Doctors perform angiography using:<ul class=tightlist><li>x-rays with catheters<li>computed tomography (CT)<li>magnetic resonance imaging (MRI)</ul><p>CT angiography uses a CT scanner to produce detailed images of both blood vessels and tissues in various parts of the body. During the exam, contrast material is injected through a small <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=ezM5NkE5N0U4LUUzN0EtNEVBRi1CNDg2LUVERDhBOEU1OEU3Qn0= title=Glossary> catheter </a>  placed in a vein of the arm. A radiologic technologist will capture high-resolution CT images while the contrast material flows through the blood vessels.</div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=e0c3196cce6a40f4abac9179ebf65ebe><h2 class=dontsplit>What are some common uses of the procedure?</h2><p>CT angiography is helpful in examining blood vessels and the organs supplied by them in various body parts, including:<ul><li>brain<li>neck<li>heart<li>chest<li>abdomen (such as the kidneys and liver)<li>pelvis<li>legs and feet<li>arms and hands</ul>   <p>Physicians use CT angiography to diagnose and evaluate many diseases of blood vessels and related conditions such as:<ul><li>aneurysms<li>blockages<li>blood clots<li>congenital (birth-related) abnormalities of the cardiovascular system, including the heart<li>disorganized blood vessels, such as vascular malformations<li>injury<li>tumors<li>vessel rupture or tears</ul><p>Also, physicians use CT angiography to check blood vessels following surgery, such as:<ul><li>identify abnormalities, such as <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=ezdCMEVGMDlGLUIyQjMtNENCOC1BNjdFLUIzQUM5QUFFREM2N30= title=Glossary> aneurysms, </a>  in the aorta, both in the chest and abdomen, or in other arteries.<li>detect <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=ezY4MTg4MDA5LTUxRjUtNDc4NC1BOTE3LUNDN0ExQjkyNjcyQX0= title=Glossary> atherosclerotic </a>  (plaque) disease in the carotid artery of the neck, which may limit blood flow to the brain and cause a stroke.<li>identify a <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=ezU4QTA1REM5LThENDQtNDQyNC1BMTZDLUJCQTk1MTVDRUU5N30= title=Glossary> arteriovenous malformation </a> inside the brain or elsewhere.<li>detect plaque disease that has narrowed the arteries to the legs and help prepare for angioplasty/stent placement or surgery.<li>detect disease in the arteries to the kidneys or visualize blood flow to help prepare for a kidney transplant or stent placement.<li>guide interventional radiologists and surgeons making repairs to diseased blood vessels, such as implanting <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=ezkyRTI2MTBCLUZEMDYtNEJDMi1CQUU5LTk1QTQwNjhFNkYzMX0= title=Glossary> stents </a>  or evaluating a stent after implantation.<li>detect injury to one or more arteries in the neck, chest, abdomen, pelvis, or limbs following trauma.<li>evaluate arteries feeding a tumor prior to surgery or other procedures such as chemoembolization or selective internal radiation therapy.<li>identify <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=e0UwM0VEQzhDLTBENUYtNDkwNS1CMTIyLTdFRkVGNjNBMDc1Mn0= title=Glossary> dissection </a>  or splitting in the aorta in the chest or abdomen or its major branches.<li>show the extent and severity of coronary artery disease and its effects and plan for an intervention, such as a <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=ezMyMEY1NTIwLUQwMzktNDM4MS05OEZDLTQ0MTVCMDIyRTZDQn0= title=Glossary> coronary bypass </a>  and stenting.<li>examine pulmonary arteries in the lungs to detect <a href=https://www.radiologyinfo.org/en/info/pulmonary-embolism> <em> pulmonary embolism </em> </a>  (blood clots, such as those traveling from leg veins) or pulmonary AVMs.<li>look at congenital abnormalities in blood vessels, especially arteries in children (e.g., malformations in the heart or other blood vessels due to congenital heart disease).<li>evaluate <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=e0ZCNUMxNzdFLUYxQkUtNENFRC1BQjQzLTg4NzcwMzlENjVDMX0= title=Glossary> stenosis </a>  and obstructions of vessels.</li>  </ul></div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=6fb9acac25264096b743f0b077e3f870><h2 class=dontsplit>How should I prepare?</h2><p>Wear comfortable, loose-fitting clothing to your exam. You may need to change into a gown for the procedure.<p>Metal objects, including jewelry, eyeglasses, dentures, and hairpins, may affect the CT images. Leave them at home or remove them prior to your exam. Some CT exams will require you to remove hearing aids and removable dental work. Women will need to remove bras containing metal underwire. You may need to remove any piercings, if possible.<p>Your doctor may instruct you to not eat or drink anything for a few hours before your exam if it will use <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=e0FFRjY2NDY2LTcyQUMtNDc1Ni1BNTY1LTUyMTJBRjZGQzVDQX0= title=Glossary> contrast material </a> . Tell your doctor about all medications you are taking and if you have any allergies. If you have a known allergy to contrast material, your doctor may prescribe medications (usually a steroid) to reduce the risk of an allergic reaction. To avoid unnecessary delays, contact your doctor well before the date of your exam.<p>Also tell your doctor about any recent illnesses or other medical conditions and whether you have a history of heart disease, asthma, diabetes, kidney disease, or thyroid problems. Any of these conditions may increase the risk of an adverse effect.<p>Women should always inform their physician and the CT technologist if there is any possibility that they may be pregnant. <em> See the <a href=https://www.radiologyinfo.org/en/info/safety-ct-pregnancy> CT Safety During Pregnancy </a>  page for more information. </em><p>If you are breastfeeding at the time of the exam, ask your doctor how to proceed. It may help to pump breast milk ahead of time. Keep it on hand for use until all contrast material has cleared from your body (about 24 hours after the test). However, the most recent American College of Radiology (ACR) Manual on Contrast Media reports that studies show the amount of contrast absorbed by the infant during breastfeeding is extremely low. <em> For further information please consult the <a rel="noopener noreferrer"href=https://www.acr.org/Clinical-Resources/Contrast-Manual target=_blank> ACR Manual on Contrast Media </a> and its references. </em></div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=e9d3f2e55a2c47a7b73b33ddbb1a4e85><h2 class=dontsplit>What does the equipment look like?</h2><p>The CT scanner is typically a large, donut-shaped machine with a short tunnel in the center. You will lie on a narrow table that slides in and out of this short tunnel. Rotating around you, the x-ray tube and electronic x-ray detectors are located opposite each other in a ring, called a gantry. The computer workstation that processes the imaging information is in a separate control room. This is where the technologist operates the scanner and monitors your exam in direct visual contact. The technologist will be able to hear and talk to you using a speaker and microphone.</div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=b981e6392cca4f0789f203a23ffdea64><h2 class=dontsplit>How does the procedure work?</h2><p>There are many similarities between conventional x-ray imaging and CT scanning. During conventional x-ray imaging, a single x-ray beam source sends x-rays through the body. A detector plate captures the x-rays that come out of the body. Based on the amount of x-rays blocked by the body organs, the image will appear in different shades of gray. For example, bones appear white on the x-ray while air is relatively black.<p>For CT scans, multiple x-ray beam sources and sets of x-ray detectors spin around the body at high speed. The x-ray beam sources send multiple small high-energy x-ray beams through the body. The detectors capture those x-rays that come out of the body. During the examination, you will lie on a table that moves through the CT scanner so that the x-ray beams can examine different areas of the body. Then, a fast computer will take the information gathered from the scanner to produce images of the body. The computer processes a large volume of CT scan data to create two or three-dimensional images of the body.<p>Radiologists will analyze these images using sophisticated computer programs and high-quality monitors to detect diseases in the body.<p>Procedures use contrast material to clearly define the blood vessels being examined by making them appear bright white.</div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=b74eccd524a64304811d3bb488fd73ae><h2 class=dontsplit>How is the procedure performed?</h2><p>Prior to, or on the day of the procedure, you may be asked to complete a questionnaire to ensure your safety during this procedure. A nurse or <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=e0Y3RUNFRTdELTg4NkQtNDMyOC05RDc5LTNBODg5MkQxMkMzRH0= title=Glossary> technologist </a>  will insert an <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=e0ZDMzNFOEY0LTIwRDktNDMxMy1BOTFDLTY5NEY2Q0E0N0U1Q30= title=Glossary> intravenous </a>  (IV) catheter into a vein, usually in your arm or hand. Rarely, a small amount of blood is withdrawn through the catheter or finger stick to test kidney function.<p>The technologist begins by positioning you on the CT exam table, usually lying flat on your back. They may use straps and pillows to help you maintain the correct position and remain still during the exam.</p>   <p>An automatic injection pump connected to the IV will inject contrast material at a specified rate. In some cases, especially in children and patients with fragile and small veins, the contrast may be hand-injected using a syringe. During scanning, the table is positioned at the start point of imaging and will then move through the opening of the machine as the actual CT scanning is performed. A single scan takes approximately one to two minutes, but multiple scans may be required.<p>During CT angiography of the heart, electrocardiogram (ECG) leads (sticky patches) will be placed on your chest to synchronize CT scanning with your heartbeats. If your heart beats too fast, it may be temporarily slowed down with medication to obtain clear images of the heart. If you receive heart rate control medication, you will be closely monitored during and after the procedure.<p>The technologist may ask you to hold your breath during the scanning. Any motion, including breathing and body movements, can lead to <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=e0RBMEVENDUyLTFCRjgtNDdDMC05MzM3LTE4Q0E3NjUwRjIzNn0= title=Glossary> artifacts </a>  on the images. This loss of image quality can resemble the blurring seen on a photograph taken of a moving object.</p>   <div class=ped-graphic><p>Occasionally, sedation is required for children to keep them still during scanning. Your doctor will help determine if sedation is needed and, if so, will arrange it. Preparation for sedation may include no eating and drinking for several hours before the exam to prevent complications. Also, an extended close observation following the scan may be required until the medication used for sedation wears off.</div><p>When the exam is complete, the technologist will ask you to wait until they verify that the images are of high enough quality for accurate interpretation by the radiologist.</p>   <p>Following the exam, the technologist will remove the intravenous catheter and place a bandage over the needle puncture site.<p>The entire CT angiography exam may be over within a few seconds. However, the actual time in the scanner room may be longer, as the technologist will have to appropriately position you on the table, verify placement of the IV line, do preliminary imaging, and set up the scanner and contrast injection pump settings based on the part of the body being imaged.<div class=ped-graphic><p>CT angiography is rarely performed in children as they are more sensitive to radiation than adults. For children and for adults of reproductive age, radiologists administer low radiation dose CT scans with dose reduction measures.</div></div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=546359ca2120475faefbcf172b23adc0><h2 class=dontsplit>What will I experience during and after the procedure?</h2><p>CT exams are generally painless, fast, and easy. Multidetector CT reduces the amount of time that the patient needs to lie still.<p>Though the scan is painless, you may have some discomfort from remaining still for several minutes or from placement of an IV. If you have a hard time staying still, are very nervous, anxious, or in pain, you may find a CT exam stressful. The technologist or nurse, under the direction of a doctor, may offer you some medication to help you tolerate the CT exam.<p>If the exam uses iodinated contrast material, your doctor will screen you for chronic or acute kidney disease. The doctor may administer contrast material intravenously (by vein), so you will feel a pin prick when the nurse inserts the needle into your vein. You may feel warm or flushed as the contrast is injected. You also may have a metallic taste in your mouth. This will pass. You may feel a need to urinate. However, these are only side effects of the contrast injection, and they subside quickly.<p>When you enter the CT scanner, you may see special light lines projected onto your body. These lines help ensure that you are in the correct position on the exam table. With modern CT scanners, you may hear slight buzzing, clicking and whirring sounds. These occur as the CT scanner's internal parts, not usually visible to you, revolve around you during the imaging process.<p class=ped-graphic>You will be alone in the exam room during the CT scan, unless there are special circumstances. For example, sometimes a parent wearing a lead shield may stay in the room with their child. However, the technologist will always be able to see, hear and speak with you through a built-in intercom system.</p>   <p>After a CT exam, the technologist will remove your intravenous line. They will cover the tiny hole made by the needle with a small dressing. You can return to your normal activities immediately.</div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=3a84c00022104980a2448b676461b281><h2 class=dontsplit>Who interprets the results and how do I get them?</h2><p>A <a href=https://www.radiologyinfo.org/en/info/article-your-radiologist> <em> radiologist </em> </a> , a doctor specially trained to supervise and interpret radiology exams, will analyze the images. The radiologist will send an official report to the doctor who ordered the exam.<p>You may need a follow-up exam. If so, your doctor will explain why. Sometimes a follow-up exam further evaluates a potential issue with more views or a special imaging technique. It may also see if there has been any change in an issue over time. Follow-up exams are often the best way to see if treatment is working or if a problem needs attention.</div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=f30d4e1d138c40ea9bc69790641c1efc><h2 class=dontsplit>What are the benefits vs. risks?</h2><h3>Benefits</h3><ul><li>Angiography may eliminate the need for surgery. If surgery remains necessary, it can be performed more accurately.<li>CT angiography is fast, non-invasive and may have fewer complications compared to conventional angiography.<li>CT angiography may provide more precise anatomical details than other angiography exams such as conventional catheter angiography and <a data-target=#glModal data-toggle=modal href=https://www.radiologyinfo.org/glossary?modal=1&id=e0RCRUZCRjZGLTA5RkEtNDE3NC1BMjgyLTg0REU3RDczMTNBRX0= title=Glossary> magnetic resonance imaging (MRI) </a> .<li>For CT Angiography, there is no need for sedation or general anesthesia.<li>CT angiography of the heart is a useful way of detecting blocked coronary arteries.<li>CT angiography may also cost less than catheter angiography.<li>No radiation remains in a patient's body after a CT exam.<li>The x-rays used for CT scanning should have no immediate side effects.</ul><h3>Risks</h3><p>Most patients complete CT angiography with no adverse events.<ul><li>There is always a slight chance of cancer from excessive exposure to radiation. However, the benefit of an accurate diagnosis far outweighs the risk involved with CT scanning.<li>If you have a history of allergy to x-ray contrast material, your doctor may advise you to take special precautionary medication, such as a steroid, for a few hours or the day before CT angiography to lessen the chances of an allergic reaction. Another option is to undergo a different exam that does not require iodinated contrast material.<li>In patients who are at risk for kidney failure and who already have borderline kidney function, administering iodinated contrast material could potentially further damage kidney function. Check with your referring doctor and radiologist to obtain more information regarding this risk.<li>If a large amount of x-ray contrast material leaks out from the vein being injected and spreads under the skin where the IV is placed, it may damage the skin, blood vessels and nerves. If you feel any pain or tingling sensation in this area during or immediately after the contrast material injection, you should immediately inform the nurse/technologist.<li>Women should always tell their doctor and x-ray or CT technologist if there is any chance they are pregnant. <em> See the <a href=https://www.radiologyinfo.org/en/info/safety-radiation> Safety in X-ray, Interventional Radiology and Nuclear Medicine Procedures </a>  page for more information about pregnancy and x-rays. </em><li>IV contrast manufacturers indicate mothers should not breastfeed their babies for 24-48 hours after contrast material is given. However, the most recent American College of Radiology (ACR) Manual on Contrast Media reports that studies show the amount of contrast absorbed by the infant during breastfeeding is extremely low. <em> For further information please consult the <a rel="noopener noreferrer"href=https://www.acr.org/Clinical-Resources/Contrast-Manual target=_blank> ACR Manual on Contrast Media </a> and its references. </em><li>The risk of severe allergic reaction to contrast materials that contain iodine is rare, and hospitals are well-equipped to deal with them.</ul><h3>A Word About Minimizing Radiation Exposure</h3><p>Doctors take special care during x-ray exams to use the lowest radiation dose possible while producing the best images for evaluation. National and international radiology protection organizations continually review and update the technique standards radiology professionals use.<p>Modern x-ray systems minimize stray (scatter) radiation by using controlled x-ray beams and dose control methods. This ensures that the areas of your body not being imaged receive minimal radiation exposure.<p>Every effort will be made to reduce radiation while performing CT angiography, including tailoring the scan parameters specific to your body type. The scanning area will also be limited to the organ of interest to avoid unnecessary radiation to other body parts.</div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=6cb1f7bc371f4edea87169ed79ca3788><h2 class=dontsplit>What are the limitations of CT Angiography?</h2><p>A person who is very large may not fit into the opening of a conventional CT scanner. Or, they may be over the weight limit—usually 450 pounds—for the moving table.<p>It is not advised to administer iodinated contrast material in patients with impaired renal function or who previously exhibited a severe allergic reaction to contrast material.</div><p class=top-link><a class=top href=#top> top of page </a><div class=sectiondiv id=c6b3d6b3692a4d78aa6f329204786702><h2 class=dontsplit>Which test, procedure or treatment is best for me?</h2><ul><li><a href=https://www.radiologyinfo.org/en/info/article-appropriateness-criteria#4170dd37d57443dd8f60ab60d15a2683> <em> Iliac Artery Occlusive Disease </em> </a><li><a href=https://www.radiologyinfo.org/en/info/article-appropriateness-criteria#767388c8857c4b1bb0cc35bf831b5b6b> <em> Imaging of Deep Inferior Epigastric Arteries for Surgical Planning (Breast Reconstruction Surgery) </em> </a> <a href=https://www.radiologyinfo.org/en/info/article-appropriateness-criteria#34166a6a7695406e8acd976a087c3a52> <em> </em> </a><li><a href=https://www.radiologyinfo.org/en/info/article-appropriateness-criteria#34166a6a7695406e8acd976a087c3a52> <em> Transcatheter Aortic Valve Replacement </em> </a></ul></div><p class=top-link><a class=top href=#top> top of page </a><p class=reviewdate>This page was reviewed on March, 23, 2021<form action=/formbuilder?fxb.FormItemId=c5898a94-8203-4a58-a474-3d7a7312cf0e&fxb.HtmlPrefix=fxb.d3510dac-d897-4330-92d8-1442cb12f24e data-ajax=true data-ajax-method=Post data-ajax-mode=replace-with data-ajax-success=$.validator.unobtrusive.parse('#fxb_d3510dac-d897-4330-92d8-1442cb12f24e_c5898a94-8203-4a58-a474-3d7a7312cf0e');$.fxbFormTracker.parse('#fxb_d3510dac-d897-4330-92d8-1442cb12f24e_c5898a94-8203-4a58-a474-3d7a7312cf0e'); data-ajax-update=#fxb_d3510dac-d897-4330-92d8-1442cb12f24e_c5898a94-8203-4a58-a474-3d7a7312cf0e data-sc-fxb=c5898a94-8203-4a58-a474-3d7a7312cf0e enctype=multipart/form-data id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_c5898a94-8203-4a58-a474-3d7a7312cf0e method=post><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_FormSessionId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.FormSessionId type=hidden value=8b096c53-710f-406e-ba06-57feb3f41cfc><input name=__RequestVerificationToken type=hidden value=7BsknXcW6CEw7HjxdbGvKYoBPlEAl9_imZaMDsV8lLa7CGtbkFNkvYMnsf6lPb7UpoH76wDA9mP1vux-CmkdwdUnarEWlv2DJWADFuZCxG41><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_FormItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.FormItemId type=hidden value=c5898a94-8203-4a58-a474-3d7a7312cf0e><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_PageItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.PageItemId type=hidden value=1a4ee31a-099d-4f72-98f1-d41cb7d7de8f><div class=feedback-content><h2 class=dontsplit>Send us your feedback</h2><div><div><div class=radiobutton><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_Index_31d3a273-ebea-4047-9ddb-54dd1f05258c name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields.Index type=hidden value=31d3a273-ebea-4047-9ddb-54dd1f05258c><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_31d3a273-ebea-4047-9ddb-54dd1f05258c__ItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[31d3a273-ebea-4047-9ddb-54dd1f05258c].ItemId type=hidden value=31d3a273-ebea-4047-9ddb-54dd1f05258c><label class=radio-label>Did you find the information you were looking for?</label><label><input data-sc-field-name=DidYouFind data-sc-tracking=True name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[31d3a273-ebea-4047-9ddb-54dd1f05258c].Value type=radio value=Yes> Yes</label><label><input data-sc-field-name=DidYouFind data-sc-tracking=True name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[31d3a273-ebea-4047-9ddb-54dd1f05258c].Value type=radio value=No> No</label><span class=field-validation-valid data-valmsg-for=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[31d3a273-ebea-4047-9ddb-54dd1f05258c].Value data-valmsg-replace=true> </span></div></div><p>Please type your comment or suggestion into the text box below. <strong> Note: </strong> we are unable to answer specific questions or offer individual medical advice or opinions.<div class=feedback-form-group><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_Index_07ddddd8-2ff4-49d3-8489-a68ad70fc985 name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields.Index type=hidden value=07ddddd8-2ff4-49d3-8489-a68ad70fc985><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_07ddddd8-2ff4-49d3-8489-a68ad70fc985__ItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[07ddddd8-2ff4-49d3-8489-a68ad70fc985].ItemId type=hidden value=07ddddd8-2ff4-49d3-8489-a68ad70fc985><label for=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_07ddddd8-2ff4-49d3-8489-a68ad70fc985__Value>Comments:</label><textarea class=form-control data-sc-field-name=ccomments data-sc-tracking=True id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_07ddddd8-2ff4-49d3-8489-a68ad70fc985__Value maxlength=512 name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[07ddddd8-2ff4-49d3-8489-a68ad70fc985].Value placeholder=Comments rows=4></textarea><span class=field-validation-valid data-valmsg-for=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[07ddddd8-2ff4-49d3-8489-a68ad70fc985].Value data-valmsg-replace=true> </span></div><div class="form-group form-group-left"><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_Index_05f0fbaf-19df-4f75-9616-c4635778933a name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields.Index type=hidden value=05f0fbaf-19df-4f75-9616-c4635778933a><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_05f0fbaf-19df-4f75-9616-c4635778933a__ItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[05f0fbaf-19df-4f75-9616-c4635778933a].ItemId type=hidden value=05f0fbaf-19df-4f75-9616-c4635778933a><label class=hp-special for=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_05f0fbaf-19df-4f75-9616-c4635778933a__Value>E-Mail:</label><input data-val-regex="E-Mail: contains an invalid email address."class=hp-special data-sc-field-name=cemail data-sc-tracking=True data-val=true data-val-regex-pattern=^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,17}$ id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_05f0fbaf-19df-4f75-9616-c4635778933a__Value maxlength=255 name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[05f0fbaf-19df-4f75-9616-c4635778933a].Value placeholder=Email type=email><span class=field-validation-valid data-valmsg-for=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[05f0fbaf-19df-4f75-9616-c4635778933a].Value data-valmsg-replace=true> </span></div><div class=form-group><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_Index_3c84793f-344d-4c24-bef6-10886da5510b name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields.Index type=hidden value=3c84793f-344d-4c24-bef6-10886da5510b><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_3c84793f-344d-4c24-bef6-10886da5510b__ItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[3c84793f-344d-4c24-bef6-10886da5510b].ItemId type=hidden value=3c84793f-344d-4c24-bef6-10886da5510b><label class=hp-special for=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_3c84793f-344d-4c24-bef6-10886da5510b__Value>Area Code:</label><input placeholder="Area Code"class=hp-special data-sc-field-name=careacode data-sc-tracking=True id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_3c84793f-344d-4c24-bef6-10886da5510b__Value maxlength=255 name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[3c84793f-344d-4c24-bef6-10886da5510b].Value><span class=field-validation-valid data-valmsg-for=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[3c84793f-344d-4c24-bef6-10886da5510b].Value data-valmsg-replace=true> </span></div><div class=form-group><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_Index_5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields.Index type=hidden value=5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f__ItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f].ItemId type=hidden value=5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f><label class=hp-special for=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f__Value>Phone no:</label><input class=hp-special data-sc-field-name=cphone data-sc-tracking=True id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f__Value maxlength=255 name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f].Value placeholder=Phone type=tel><span class=field-validation-valid data-valmsg-for=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[5de0318d-7a7f-4fd1-9dac-a8f0007d4e2f].Value data-valmsg-replace=true> </span></div><div><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_Index_33256dc9-6aa2-44fe-9b38-2279253a8404 name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields.Index type=hidden value=33256dc9-6aa2-44fe-9b38-2279253a8404><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_33256dc9-6aa2-44fe-9b38-2279253a8404__ItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[33256dc9-6aa2-44fe-9b38-2279253a8404].ItemId type=hidden value=33256dc9-6aa2-44fe-9b38-2279253a8404><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_33256dc9-6aa2-44fe-9b38-2279253a8404__Value name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[33256dc9-6aa2-44fe-9b38-2279253a8404].Value type=hidden><script>var hiddenField = document.getElementById("fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_33256dc9-6aa2-44fe-9b38-2279253a8404__Value");
    hiddenField.value = window.location.href;
    var parent = hiddenField.parentNode;
    if (parent.classList.contains("sc-formdesign-fieldcontainer")) {
        var textDiv = document.createElement("div");
        textDiv.innerHTML = "(Hidden referring URL field)";
        parent.appendChild(textDiv);
    }</script></div><div><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_Index_a0c5b025-8877-4a30-aa49-5669e08fccb1 name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields.Index type=hidden value=a0c5b025-8877-4a30-aa49-5669e08fccb1><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_a0c5b025-8877-4a30-aa49-5669e08fccb1__ItemId name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[a0c5b025-8877-4a30-aa49-5669e08fccb1].ItemId type=hidden value=a0c5b025-8877-4a30-aa49-5669e08fccb1><div id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_a0c5b025-8877-4a30-aa49-5669e08fccb1__CaptchaValue_wrapper></div><input data-val-required="Please confirm you are not a robot."class=fxt-captcha data-val=true id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_a0c5b025-8877-4a30-aa49-5669e08fccb1__CaptchaValue name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[a0c5b025-8877-4a30-aa49-5669e08fccb1].CaptchaValue type=hidden><span class=field-validation-valid data-valmsg-for=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.Fields[a0c5b025-8877-4a30-aa49-5669e08fccb1].CaptchaValue data-valmsg-replace=true> </span><script>var _captchaInput = window.document.getElementById('fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_a0c5b025-8877-4a30-aa49-5669e08fccb1__CaptchaValue');
    var onloadCallback = function() {
        window.grecaptcha.render('fxb_d3510dac-d897-4330-92d8-1442cb12f24e_Fields_a0c5b025-8877-4a30-aa49-5669e08fccb1__CaptchaValue_wrapper', {
            'sitekey': '6LdWABoTAAAAAHi0J9yPV-yoAro2e34-jI9e1Lh3',
            'callback': function(token) {
                _captchaInput.value = token;
            },
            'expired-callback': function (args) {
                _captchaInput.value = '';
            }
        });
    };</script><script async defer src=https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit&hl=en></script><input class="button inverse"name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.bd0091f4-9cdd-433c-b78e-66b3503eed88 type=submit value=Submit><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_NavigationButtons name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.NavigationButtons type=hidden value=bd0091f4-9cdd-433c-b78e-66b3503eed88><input id=fxb_d3510dac-d897-4330-92d8-1442cb12f24e_bd0091f4-9cdd-433c-b78e-66b3503eed88 name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.bd0091f4-9cdd-433c-b78e-66b3503eed88 type=hidden value=1><input class="button cancel"value="Clear form"name=fxb.d3510dac-d897-4330-92d8-1442cb12f24e.a6038e2c-e11b-4ee7-9e01-5822ff7b7e05 type=reset></div></div></div></form></div></div><div class=col-md-4 id=ri-rtcol><script language=javascript>function jwPlayerCallBackPlayer1() {
            var player1 = jwplayer("player1");

            player1.setup({
                image: "https://www.radiologyinfo.org/-/media/radinfo/gallery-items/videothumbs/radiologistexplains/ct-angiography-explained.ashx",
                mediaid: "d6qoQIOH",
                width: "100%",
                aspectratio: "16:9",
                skin: {
                    "name": "ri-jwp"
                },
                sources:
                    [
                            {
                                file: "https://www.radiologyinfo.org/-/media/radinfo/gallery-items/videos/h264_aac/radiologistexplains/hd/ct-angiography-explained.ashx",
                            label: "High-definition",
                                type: 'mp4'
                            }
                                                    ,
                                                    {
                            file: "https://www.radiologyinfo.org/-/media/radinfo/gallery-items/videos/h264_aac/radiologistexplains/sd/ct-angiography-explained.ashx",
                            label: "Standard-definition",
                            "default": "true",
                            type: 'mp4'
                        }
                ]
            });


            player1.on('play',
                function() {
                    pausePlayers(1);
                });
        }</script><div class=row><div class="hidden-md hidden-sm hidden-xs col-lg-12"id=video1><div id=player1></div></div></div><h3 class="colorhead dontsplit">Images</h3><div class="modal fade galModal"style="display: none;"aria-hidden=true aria-labelledby=galleryheading0 id=galModal0><div class=modal-dialog><div class=modal-content><div class=modal-header><button aria-hidden=true class=close data-dismiss=modal type=button>×</button><h2 class="modal-title dontsplit"id=galleryheading1>Image Gallery</h2></div><div class=modal-body><p><img alt="Patient undergoing computed tomography (CT) scan."class=img-responsive src=https://www.radiologyinfo.org/-/media/radinfo/gallery-items/images/u-to-z/woman-patient-undergoing-ct.ashx><p>Patient undergoing computed tomography (CT) scan.</div></div></div></div><a data-target=#galModal0 data-toggle=modal href=#> <div class=photoholder id=friendlyimage0><img alt="Patient undergoing computed tomography (CT) scan."class=img-responsive src=https://www.radiologyinfo.org/-/media/radinfo/gallery-items/images/u-to-z/woman-patient-undergoing-ct.ashx><span class=enlarge> View full size with caption </span></div> </a><div id=pediatric><h3 class="colorhead dontsplit">Pediatric Content</h3><div class=left-pad><p class="ped-graphic small">Some imaging tests and treatments have special pediatric considerations. The teddy bear denotes child-specific content.</div></div><div id=related><h3 class="colorhead dontsplit">Related Articles and Media</h3><div class=left-pad><ul><li class=dontsplit><a class=fullURL href=https://www.radiologyinfo.org/en/info/safety-contrast> Contrast Materials </a><li class=dontsplit><a class=fullURL href=https://www.radiologyinfo.org/en/info/safety-ct-pregnancy> Computer Tomography (CT) Safety During Pregnancy </a><li class=dontsplit><a class=fullURL href=https://www.radiologyinfo.org/en/info/safety-xray> Radiation Dose in X-Ray and CT Exams </a></ul><ul id=related-images-and-videos><li class=dontsplit><a href=https://www.radiologyinfo.org/en/search?usableOn=3df3e8d7561d40d5add91ecf6efa6283&type=2> Images related to CT Angiography (CTA) </a><li class=dontsplit><a href=https://www.radiologyinfo.org/en/search?usableOn=3df3e8d7561d40d5add91ecf6efa6283&type=3> Videos related to CT Angiography (CTA) </a></ul></div></div><div class=left-pad id=kidslink><ul><li class=dontsplit><a href=https://www.radiologyinfo.org/en/for-kids> RadInfo 4 Kids </a></ul></div><div class=aboutsite style=padding-bottom:15px><h3 class="colorhead dontsplit">Sponsored By</h3><div><a aria-label="About RSNA"title="About RSNA"class=sponsored-logo href=https://www.radiologyinfo.org/en/info/about-rsna> <img alt=RSNA src=https://www.radiologyinfo.org/-/media/radinfo/logos/new_rsna_signature_logo_gray-b.ashx?h=50&w=100&la=en&hash=0AB10208655B6098061F9E230671591629EC2570> </a><a aria-label="About ACR"title="About ACR"class=sponsored-logo href=https://www.radiologyinfo.org/en/info/about-acr> <img alt=ACR src=https://www.radiologyinfo.org/-/media/radinfo/logos/acr-logo-gray-b.ashx?h=50&w=100&la=en&hash=1387A96C41AFBF6AFDF6B8F5395E602B0E075C69> </a></div></div><div class="glance small"id=eop-info><h4 class=dontsplit>Please note</h4><p><em> RadiologyInfo.org </em> is not a medical facility. Please contact your physician with specific medical questions or for a referral to a radiologist or other physician. To locate a medical imaging or radiation oncology provider in your community, you can search the <a rel="noopener noreferrer"href=http://www.acraccreditation.org/accredited-facility-search target=_blank> ACR-accredited facilities database </a> .<p><strong> This website does not provide cost information. </strong> The costs for specific medical imaging tests, treatments and procedures may vary by geographic region. Discuss the fees associated with your prescribed procedure with your doctor, the medical facility staff and/or your insurance provider to get a better understanding of the possible charges you will incur.<p><strong> Web page review process: </strong> This Web page is reviewed regularly by a physician with expertise in the medical area presented and is further reviewed by committees from the Radiological Society of North America (RSNA) and the American College of Radiology (ACR), comprising physicians with expertise in several radiologic areas.<p><strong> Outside links: </strong> For the convenience of our users, <em> RadiologyInfo </em> .org provides links to relevant websites. <em> RadiologyInfo.org </em> , RSNA and ACR are not responsible for the content contained on the web pages found at these links.</div></div></div><div class=row style=clear:both;><footer class=col-xs-12><div id=footer-nav><a href=https://www.radiologyinfo.org/en/about-us> About Us </a> | <a href=https://www.radiologyinfo.org/en/contact-us> Contact Us </a> | <a href=https://www.radiologyinfo.org/en/faq> FAQ </a> | <a href=https://www.radiologyinfo.org/en/info/about-privacy> Privacy </a> | <a href=https://www.radiologyinfo.org/en/info/about-terms-of-use> Terms of Use </a> | <a href=https://www.radiologyinfo.org/en/links> Links </a> | <a href=https://www.radiologyinfo.org/en/sitemap> Site Map </a><br><a href=https://www.facebook.com/radiologyinfo?ref=sgm target=_blank> <span class=radinfo-facebook> </span> </a><a href=https://twitter.com/radiologyinfo_ target=_blank> <span class=radinfo-twitter> </span> </a></div><p class=small>Copyright © 2021 Radiological Society of North America, Inc. (RSNA). <br> To help ensure current and accurate information, we do not permit copying but encourage linking to this site.</footer></div><script src=https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js></script><script src=https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js></script><script src=https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.0/jquery.validate.min.js></script><script src=https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.0/additional-methods.min.js></script><script>// PREVENT CACHING OF GLOSSARY PAGE IN MODAL
    $(document).ready(function () {
        $(".modal").on('hidden.bs.modal', function () {
            $(this).data('bs.modal', null);
        });
    });</script><div class="modal fade"id=glModal role=dialog tabindex=-1><div class=modal-dialog><div class=modal-content></div></div></div><script src=https://cdnjs.cloudflare.com/ajax/libs/knockout/3.3.0/knockout-min.js></script><script src=/js/knockout/azindex-model.js></script><script src=/js/knockout/news-listing-model.js></script><script src=/js/knockout/printable-handout-model.js></script><script src=/js/knockout/search-model.js></script><script src=/js/knockout/testimonials-model.js></script><script src=/js/knockout/video-list-model.js></script><script src=/jwplayer/jwplayer-V8/jwplayer.js></script><script src=/js/jquery.columnizer.min.js></script><script>jwplayer.key = "XLd/mxP0C6AKXJ6ApRYrPXfEg3CHc+PSjBXP/e/z0UY=";</script></div><script>function pausePlayers(playing) {
        for (var i = 1; i < 5; i++) {
            if (i != playing) {
                jwplayer("player" + i).pause(true);
            }
        }
    };

 if ($.isFunction(window.jwPlayerCallBackPlayer1)) {
		//execute it
        jwPlayerCallBackPlayer1();
    } 

 if ($.isFunction(window.jwPlayerCallBackPlayer2)) {
		//execute it
        jwPlayerCallBackPlayer2();
    } 

if ($.isFunction(window.jwPlayerCallBackPlayer3)) {
		//execute it
        jwPlayerCallBackPlayer3();
    } 

if ($.isFunction(window.jwPlayerCallBackPlayer4)) {
		//execute it
        jwPlayerCallBackPlayer4();
    }</script><script src=/js/cookie-policy-en.js></script><script>$(document).ready(function(){
  $('#page-contents').not('.no-columnize').columnize({ padding: 50, width: 500,lastNeverTallest: true });
  $('.twoColumns').columnize({ columns: 2,lastNeverTallest: true });
  $('li, h1, h2, h3, h4').addClass('dontsplit'); 
  $('.split').removeClass('dontsplit'); 
  });</script><script>var fileExtensionsToTrack = ["ashx","pdf","docx","doc","ppt", "mp4","zip","xls","xlsx"];
var includedHosts = ["www.radiologyinfo.org","stage.radiologyinfo.org","dev.radiologyinfo.org","auth.radiologyinfo.org","stageauth.radiologyinfo.org","devauth.radiologyinfo.org"]; 

$(document).ready(function () {
    $('body').on('click', 'a', function(event) {
        var isProd = top.location.host.indexOf("stage") === -1 && top.location.host.indexOf("dev") === -1;
        var linkHost = this.host;
        if (linkHost === null || this.getAttribute('href') === null) return;
        var url = $(this).attr('href').split('?')[0]; //remove query parameters

        var l = includedHosts.length;
        var validHost = false;
        for (var i = 0; i < l; i++) {
            if (linkHost.indexOf(includedHosts[i]) > -1) {
                validHost = true;
                break;
            } 
        }
        if (!validHost) return; //make sure the link is to one of the included sites
        if (!url.startsWith('http')) {//fix relative URLs
            url = window.location.protocol + '//' + window.location.hostname + url;
        }

        var lUrl = url.toLowerCase();
        var lastPart = lUrl.substr(lUrl.lastIndexOf('/') + 1);
        var lIndex = lastPart.lastIndexOf('.');
        if (lIndex === -1) return; //exit if the URL has no extension

        var ext = lastPart.substr(lIndex + 1);
        //console.log(ext);
        if (fileExtensionsToTrack.indexOf(ext) > -1) {
            if (!isProd) console.log("Radinfo GA Tracking Event For: " + url.toLowerCase());
            if (isProd) ga('send','event', 'download','click',url.toLowerCase(),0,{'nonInteraction': false});

        }

    });
});
function trackPDFClick(elem) {
	var isProd = top.location.host.indexOf("stage") === -1 && top.location.host.indexOf("dev") === -1;
	var el = jQuery(elem);
	var href = (typeof(el.attr('href')) != 'undefined' ) ? el.attr('href') : '';
	href = href.split('?')[0]; //remove query parameters
	if (!href.startsWith('http')) {
		href = window.location.protocol + '//' + window.location.hostname + href;
	}
	if (isProd) ga('send','event', 'download','click',href.toLowerCase(),0,{'nonInteraction': false});
	if (!isProd) console.log("Radinfo GA Tracking Event (trackPDFClick) For: " + href.toLowerCase());
}</script>