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Fig. 4. —Bar graph shows relationship between postoperative pulmonary vascular resistance and median number of segments revealed on CT angiography to have abnormal perfusion but normal segmental arteries. Figures shown are average scores for observers 1 and 2. Note that postoperative pulmonary vascular resistance remained abnormal for patients whose preoperative CT angiograms showed more than one segment in which perfusion was abnormal with normal segmental artery.

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