“The Anger camera viewed the entire organ of interest at one
time; thus, it provided a marked improvement in gamma ray detection efficiency.”
Design
From the exterior to interior a camera is comprised of 1:
- head cover: usually made from glass
- collimator: usually made from lead with fine holes and septa
- crystal: multiple crystal elements arranged in a large rectangle, usually made from thallium-activated sodium iodide
- photomultiplier tubes
- pre-amplifiers
- electronics including: analog to digital converters, digital summing and positioning circuits and correction circuits
https://radiopaedia.org/articles/gamma-camera?lang=us