- The collimator collimates (focuses) the incoming gamma rays (see section called Cross Section of Common Detector Head)
- The detector acts as the "film" of the photographic camera, it detects the gamma rays
- The detector is a scintillator: it emits light when hit by a gamma ray
- The photomultipliers translate the information from the raw (light) form to electric signals
- The electric signals are fed into an acquisition system for corrections, generation of image and further processing
- One can use the analogy that the detector is the analog to the "negative" of photography: an intermediate form of image before "processing" to generate the "color print", the final display form
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