A system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response.A system that provides a defense mechanism to organism, providing defensive measures against antigens which would prove harmful to the organism.
Ultrasound is a type of imaging. It uses high-frequency sound waves to look at organs and structures inside the body. Health care professionals use it to view the heart, blood vessels, kidneys, liver, and other organs. During pregnancy, doctors use ultrasound to view the fetus. Unlike x-rays, ultrasound does not expose you to radiation. During an ultrasound test, you lie on a table. A special technician or doctor moves a device called a transducer over part of your body. The transducer sends out sound waves, which bounce off the tissues inside your body.
An ultrasound technician is a Diagnostic Medical Sonographer. An ultrasound is a form of medical imaging that uses penetrative sound waves to produce images of a patientâs insides. The images produced is used to diagnose diseases and for other purpose such as obtaining an image of your unborn baby. The technician applies gel over the area to be scanned so the sound waves can produce an image of the inside of the body. 2  They operate the imaging machines to obtain images of the inside of the patient. 3  They analyze images to check for errors and quality. 4  They can also make initial determination for physicians.