During an MRI, you will be enclosed in a tube-like machine for up to an hour. If you are claustrophobic, this experience can cause a great deal of anxiety, and you may need a sedative before the test if you are anxious. Talk to your doctor about your claustrophobia before the exam to see if he or she may be able to prescribe you a sedative for the procedure. Certain metallic implants may effect the MRI scans. Talk to your doctor about any metal implants you have prior to the exam.  Cochlear (ear) implants, clips used for brain aneurysms, metal coils placed within blood vessels, any kind of cardiac defibrillator or pacemaker generally means you cannot be placed in an MRI machine.  Some metallic implants pose a some risk to health and safety and the accuracy of the exam. However, depending on how long the devices have been in place before the exam it might be safe to undergo the exam with some of the following in place: artificial heart valves, implanted drug infusion ports, artificial limbs or metallic joint prosthetics, implanted nerve simulators, metal pins, screws, plates, stents, and surgical staples. Certain health concerns should be taken into consideration before you have an MRI. Talk to your doctor about safety if you have any of the following conditions:  Pregnancy History of kidney problems Allergy to iodine or gadolinium History of diabetes Before your MRI, you should take your medication as normal leading up to the exam unless otherwise instructed. You should strive to maintain as normal a schedule as possible leading up to the MRI exam. Reading up on what happens during an MRI exam can help ease the anxiety of the procedure. Learn what to expect in the days leading up to the exam.  An MRI is a large tube with holes on either end. You'll be placed on a moveable table that slides into the tube while a technologist monitors you from another room.  Magnetic fields and radio waves provide an internal reading of your body, used to detect things like brain tumors or brain cancer, chronic conditions, and...

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Write a summary of the previous text in Indonesian:
Beri tahu dokter jika Anda menderita klaustrofobia. Beri tahukan dokter mengenai implan berbahan logam yang terdapat pada diri Anda. Beri tahu dokter Anda mengenai masalah kesehatan apa pun. Minumlah obat seperti biasa. Ketahui apa yang bisa diharapkan. Ikuti petunjuk spesifik apa pun yang dokter jelaskan kepada Anda.