What is a PET scan used for in medical diagnosis?

A PET scan is used to visualize metabolic activity in organs like the brain and heart, helping assess physiological function and detect diseases early by showing how tissues are functioning.

How does a PET scan work to create images?

It works by introducing radioisotopes into the body, which emit gamma rays based on metabolic uptake. A gamma camera detects this radiation, and a computer processes the signals to generate 3D images of the organ.

What do 'hot spots' and 'cold spots' mean on a PET scan?

Hot spots are areas with increased isotope uptake, often indicating active processes like certain tumors. Cold spots show reduced or no uptake, suggesting non-functioning tissue, such as in the liver or thyroid.

What are the common isotopes used in PET scanning?

Common isotopes include iodine isotopes (e.g., 123I, 131I) for thyroid imaging and Technetium-99m (99mTc) for scans of bones, kidneys, and the heart.

How is a PET scan different from other imaging techniques like CT or MRI?

PET scans are functional studies that show metabolic activity, while CT and MRI primarily provide anatomical details. PET uses radioisotopes and gamma cameras to capture physiological processes.

What organs can be studied with a PET scan?

PET scans can visualize metabolic activity in various organs, including the brain, heart, liver, and thyroid, helping detect abnormalities based on their functional uptake patterns.

PET Scan – Metabolism Imaging Explained