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Fig. 1. —Schematic diagram illustrates structure of artificial neural network chosen for this study. Each lung was divided into three regions (upper, middle, and lower), resulting in 18 input units. Additional units were number of subsegmental perfusion mismatches, presence or absence of symmetry in the number of mismatches, and size of largest pleural perfusion. Links were defined for every possible pairing of input units between adjacent layers. Vent = ventilation scan, perf = perfusion scan, CXR = chest radiograph, Asymm = asymmetry.