Tungsten alloy collimator is used in an anger camera for collimation and absorption of gamma rays. And therefore, it improves imaging quality and protects patients. Anger camera, which is more often known as gamma camera or γ-camera, is a device used to image gamma radiation emitting radioisotopes.
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According to the researchers, a common problem of gamma cameras is their reduced sensitivity. Only the gamma rays that are emitted parallel to the tungsten alloy collimators (for a gamma camera with parallel collimators) or within a certain angular region (for a gamma camera with pinhole collimators) are the ones that reach the detector. In order to increase the sensitivity of a pinhole collimator gamma camera, one necessarily has to increase the number of pinholes and/or the angular aperture. When increasing the number of pinholes one is faced with the overlapping/multiplexing problem. Within the overlapping region one cannot identify unambiguously through which hole the incident gamma ray has previously passed before being detected.
