TABLE 2
Definitions of Terms Used in Text
| Normal zone | Region of interest (ROI) of LV with 82Rb counts greater than −1.0 SD from the mean of the normal file for those voxels |
| PDZ-early | Average 82Rb counts measured in patient’s defect zone on resting SD polar map in ROI identified by a computer program as those contiguous voxels with counts falling 2.5 or more SDs below the mean of the normal file in this ROI. Early counts are those acquired during the first 90 s. |
| PDZ-late | Similar to PDZ-early; however, late counts are those acquired in the final 100–300 s of acquisition |
| PNZ-early | Average 82Rb counts measured in patient’s normal zone at rest in ROI identified as those voxels with counts greater than −1.0 SD from the mean of the normal file in this ROI. Early counts are those acquired during the first 90 s. |
| PNZ-late | Similar to PNZ-early; however, late counts are those acquired in the final 100–300 s of acquisition |
| Defect severity |  |
| 82Rb Washout | (1.0 − [(PDZ-late/PNZ-late)/(PDZ-early/PNZ-early)]) × 100 |
| PDZ–18F-FDG | Average 18F-FDG counts in same ROI as the defect identified on resting 82Rb images |
| PNZ–18F-FDG | Average 18F-FDG counts in same ROI as the normal zone identified on resting 82Rb images |
| Mismatch | ([(PDZ 18F-FDG/PNZ 18F-FDG)/(PDZ-late/PNZ-late)] − 1.0) × 100 |
| CE | Average 82Rb background cavity counts measured in LV cavity during the first 90 s of resting acquisition |
| CL | Average 82Rb background cavity counts measured in LV cavity after the first 90 s of resting acquisition |
| C-Washout | (1.0 − [(PDZ-late − CL)/(PNZ-late − CL)/(PDZ-early − CE)/(PNZ-early − CE)]) × 100 |