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Fig. 2B —X-ray beam pattern over breast for appendicitis protocol. Exposed film after CT shows black lines (more exposure) when X-ray beam course is anterior to patient alternating with white lines that are produced when X-ray beam is posterior to patient. Note that MOSFET (metal oxide semiconductor field effect transistor) sensor size and location in breast do not permit direct exposure unless helical course brings X-ray beam precisely over detector. Red dots indicate location of MOSFET detectors at 9-, 6-, and 3-o'clock positions.