The gamma camera is an imaging technique used to carry out functional scans of the brain, thyroid, lungs, liver, gall bladder, kidneys and skeleton. Gamma camera images the radiation from a tracer or isotope introduced into the patient's body. It is also called scintillation camera and the technique is known as scintigraphy.
A radiopharmaceutical is administered to the patient and it accumulates in the organ of interest. The scintillation is selected by an array of photo multiplier tubes which generate a voltage pulse which ultimately via a complicated pathway leads to formation of an image.