PET scan

PET or positron emission tomography is a high-tech method designed to take images of the inside of the body. Other methods include X-rays and MRI (magnetic resonance imaging). PET, although highly effective at observing biological processes in action, requires the use of radioactive materials (these are safe), among other processes, and is not as easy to use as MRI.

According to the recent issue of Science News (2/17/96), scientists are working on making injectable compounds that can bring to light, live- action body processes during MRI. When these new contrast agents are perfected, they will help physicians see changes in the body as they happen as well as make crisper images. Crisper images may help physicians distinguish, for example, Alzheimer's, schizophrenia, and manic depression.