Scintillation Camera Collimators
A collimator is essentially a block of lead larger than the detector, containing an arrangement of holes which allows gamma rays to pass through from a specified direction and form the image. The lead thickness is sufficient to absorb unwanted radiation, so that the radiation reaching the detector face must have originated from a known direction. This is determined by the orientation of the hole in the lead. A typical collimator is shown in Fig. 2–1. There are broadly four types of collimators: parallel hole, converging, diverging, and pinhole. They are described below, with particular attention paid to the principle governing the performance of the parallel hole collimator.
KeywordsModulation Transfer Function Septum Thickness Hole Shape Pinhole Collimator Scintillation Camera
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