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Figure 2 Representative horizontal and vertical long axes, and short axis slices from the Tc-99m tetrofosmin (TETRO) and Tc-99m sestamibi (MIBI) stress (S) and rest (R) SPECT images of a 64-year-old man with 90% stenosis of the proximal left anterior descending coronary artery. The perfusion abnormality involving the apex, septum, and anterior walls is more severe and extensive on the Tc-99m sestamibi scan.