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 »

www.reference.com Health Diagnostics & Imaging

While the chance of a CT scan causing a problem is small, some individuals may experience an allergic reaction to the contrast dye, states WebMD. The material may also cause problems for diabetics or individuals taking m... More »

www.reference.com Health Diagnostics & Imaging

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 »

www.reference.com Health Diagnostics & Imaging

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 »

www.reference.com Health Diagnostics & Imaging

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 »

www.reference.com Health Diagnostics & Imaging