Magnetic resonance imaging (MRI) uses a magnetic field and radio waves to produce a picture of the inside of the body. When you undergo an MRI, you lie on a table that slides into a rounded scanner containing a doughnut-shaped magnet that creates a magnetic field. Radio waves are sent to the part of your body to be viewed. The atoms in your body respond by emitting energy, and a magnetic field detector measures this energy and sends it to a computer, which translates the signal and creates a picture that your doctor can read. The procedure can take from 30 to 90 minutes and is painless, but the magnetic field can interfere with a pacemaker, hearing aid, or metal implants, so your doctor needs to know if you have any of these devices in your body. MRI scanning poses no known health risks.


Ultrasound scanning uses sound waves to produce pictures of internal body structures. Doctors often use an ultrasound scan to diagnose disorders of the heart, kidneys, bladder, gallbladder, and pancreas. If your doctor orders an ultrasound scan, you will be asked to lie on a table, and the ultrasound technician will spread a gel on your skin over the area to be scanned. The technician will then move a handheld instrument called a transducer over the area, sending sound waves into your body. The sound waves bounce off of your internal organs, and the transducer transforms the waves into an image on a screen or on paper. Ultrasound is risk-free and is not painful.

CT Scan

Computed tomography (CT) scans take hundreds of X-ray images of the body from different directions that a computer then converts into cross-sectional pictures on a screen. CT scans can pick up details of abnormalities that a

Healthcare conventional X ray cannot detect. Doctors often order a CT scan to check for 91

tumors or other abnormalities in the brain, liver, spleen, lungs, kidneys, pelvis, Preventive or lymph nodes (a part of the body's immune system). During a CT scan, you lie on a table that moves into a circular machine. A tube revolves around the machine, taking multiple, low-dose X-ray images from many angles. The procedure takes about 20 minutes. Although a CT scan takes a vast number of images, the amount of radiation generated in a CT scan can be the same as or even less than that from a traditional X ray.

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