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a Axial fused perfusion SPECT and CT (240 MBq of Pulmocis®). b Axial fused ventilation SPECT and CT (148 MBq of Technegas®). c Axial perfusion SPECT. d Axial ventilation SPECT. e Axial CT scan. Matched defect in perfusion and ventilation of the posterior segment of the right upper lobe (white arrow), compared to an alveolar filling (black arrow) on the scanner
