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Technegas Versus ^81mKr Ventilation–Perfusion Scintigraphy: A Comparative Study in Patients with Suspected Acute Pulmonary Embolism

Departments of Radiology and Nuclear Medicine, University Medical Center, Utrecht; Departments of Pulmonary Medicine and Nuclear Medicine, University Hospital Center Universiteit, Amsterdam; and Department of Clinical Epidemiology and Biostatistics, Amsterdam Medical Center, University of Amsterdam, Amsterdam, The Netherlands

View larger version (44K): [in a new window]   FIGURE 1. A 50-y-old man with acute dyspnea and pleuritic chest pain. (A) Perfusion scan in right posterior oblique projection shows segmental defect in anterior segment of right upper lobe (arrow). (B and C) Technegas ventilation scan (B) reveals match with perfusion defect (arrow), whereas 81mKr ventilation scan (C) shows complete mismatch. Pulmonary angiography result was negative for PE.