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Response of single-photon sensitive cameras to stray X-ray noise. Top row: Typical response of a) Gen3 and b) Gen2+ intensified 12-bit CMOS detectors, and c) SPAD QIS accumulated over 18 linac pulses. d) Peak height distribution of X-ray induced impulse noise. Inset: Detected X-ray noise power density at distance 3 m from isocenter; signal intensity expressed in digital numbers.
