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Figure 5 Representative midventricular transaxial FDG PET images of a patient with primary pulmonary hypertension before and after the pulmonary vasodilator therapy with epoprostenol for three months. Before the pulmonary vasodilator therapy, the RV FDG accumulation was highly increased and the corrected RV SUV of FDG was 13.4 (A). After the therapy, the corrected RV SUV of FDG markedly decreased to 7.5 (B). Abbreviations as in Figures 1 and 2.