A non-contrast CT scan is a computed tomography scan performed without the use of a special dye intended to make organs show up more visibly, according to Johns Hopkins Medicine. CT scans can be performed with and withou... More »

Patients scheduled for a CT scan, or computed tomography scan, fast to avoid having food in their digestive system; this helps doctors see scan images more clearly and make accurate diagnoses, as stated by Johns Hopkins ... More »

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When undergoing a computed tomography scan without contrast, the patient removes any objects that may interfere with the scanning equipment and then lies on the table that slides into the circular CT scanning machine, ac... More »

The U.S. National Library of Medicine describes that a positron emission tomography, or PET scan, shows how organs and tissues are working, while a magnetic resonance image, an MRI, and a computed tomography, a CT scan, ... More »

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A positron emission tomography scan is conducted by administering a radioactive tracer chemical to the patient and using a full-body scanner to detect how the substance interacts with tissues, organs and blood, states Me... More »

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The main difference between a CT scan and a myelogram is that a CT scan is non-invasive, while a myelogram involves the insertion of a needle into the spinal canal, as explained by Johns Hopkins Medicine. In some cases, ... More »

Doctors perform ultrasounds on kidneys to determine the size, shape and location of the organs, according to Johns Hopkins Medicine. These scans may reveal abnormalities such as tumors, cysts, obstructions, abscesses and... More »

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