Figure 3.

Representative ¹⁸F‐DA, ¹¹C‐MRB, and ¹³NH₃ positron emission/computed tomographic (PET/CT) scans. Shown are cell phone screen shots of fused images displayed on the PET/CT scanner monitor, with spectral color scales in each image adjusted so that the minimum radioactivity is black and maximum white. Top images are sagittal, middle transaxial, and bottom coronal views. Images for ¹⁸F‐DA and ¹³NH₃ scans were from the dynamic scanning frames from 5‐10 minutes after initiation of 3‐minute tracer infusion. Images for ¹¹C‐MRB were from a static scan 15‐30 minutes after initiation of 3‐minute tracer infusion. A, ¹⁸F‐DA scans in a control subject and a PAF patient. B, ¹¹C‐MRB scans in the same control subject and PAF patient. C: ¹³NH₃ scans in the same PAF patient as in A and B, documenting normal myocardial perfusion. In the PAF patient septal ¹⁸F‐DA‐derived radioactivity at the bottom of the heart was 28% of control, whereas ¹¹C‐MRB‐derived radioactivity was 94% of control.