What is a PET scan?

An imaging scan that measures the activity or functional level of the brain by measuring its use of glucose.

Positron emission tomography, a process that uses radiation to give you a 3d image of the body.

PET scans are used to view nodules in the lungs or pleural cavity and check other organs for infiltrates or spots, such as a spot on a kidney which can't be seen on regular x-ray equipment. It defines and makes problems clearer to see.