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Xenon detector arrays are a series of highly directional xenon-filled ionization chambers. As x-rays ionize xenon atoms, the charged ions are collected as electric current at the electrodes. The current is proportional to the x-ray fluence.
DETAILS OF ACQUISITION is about 60 degrees, so fourth-generation scanners (which have detectors placed around 360 degrees) require roughly six times as many detectors as third-generation systems.
re = NZ/A,