An ellipse is a set of points, such that for any point of the set, the sum of the distances | |, | | to two fixed points , , the foci, is constant, usually denoted by , > .
Foods to Eat Before a PET Scan. A PET (positron emission tomography) scan is a powerful process for detecting cancer. Cancer cells grow extremely fast and need a lot of glucose. A doctor will inject the patient with glucose, and the PET scanner detects if any cells are emitting signs of high glucose use. If you eat before your PET scan, you risk throwing your glucose levels off balance and getting inaccurate results.
A PET scan is typically used to evaluate for active metabolism of particular lesions in the body. It uses a radioactive tracer such as either oxygen or sugar to visualize any parts of the body that are using the oxygen or sugar to an increased level over a baseline level. Cancer and active inflammation can cause increased use of oxygen and sugar. metabolic activity is the use of the oxygen and sugar. Ask Your Own Medical Question Customer reply replied 8 years ago