Quantitative Measures of LV Perfusion
| Parameter | Threshold | Measured | Reported | References | |
| Global (LV) | Defect extent (%LV) | 3%–5% | Always | Frequently | 36–39 |
| No. of SDs below mean normal | 2.5 | Always | Seldom | 36–39 | |
| Defect severity (%LV) | 3%–5% | Always | Seldom | 24 | |
| 17-segment model | SSS | 4 | Always | Frequently | 24 |
| Ischemic burden (%LV) | 10%–12% | Frequently | Frequently | 25 | |
| Viability (%LV) | 7%–20% | Frequently | Frequently | 35 | |
| Vascular territory | Defect extent (% territory) | 3%–12% | Always | Frequently | 36–39 |
| Defect/territory | Stress-to-rest improvement | 2%–10% | Always | Frequently | 36–39 |
| 17-segment model | SDS | 2 | Always | Frequently | 26 |
Ranges in thresholds are due to differences in protocols or software used. Potential for measuring the listed quantitative parameters depends on the specific software used, which also includes version number associated with age of algorithms.