Anger camera

a device used to form an image of the distribution of a gamma ray–emitting radionuclide in a patient. The radiation is passed through a collimator to reduce scatter and interacts with a sodium iodide crystal, resulting in the production of pulses of light, which are detected and converted to amplified electrical signals by an array of photomultiplier tubes behind the crystal. A pulse height analyzer then discards all but those signals arising from the photopeak of the nuclide being imaged, and the remaining signals are used to form an image of the distribution of the radionuclide on a cathode ray tube. It was the original, and is by far the most commonly used, form of scintillation camera (or gamma camera), and the terms are often used interchangeably.