SPECT/CT Imaging Protocols and Associated Radiation Exposure
| Protocol | n | Radiotracer dose (MBq) | Radiation exposure (mSv) |
| SPECT | |||
| Rest–stress | 124 (40.4) | 1,698 ± 148 | 11.7 ± 1.0 |
| Stress–rest | 74 (24.1) | 1,480 ± 507 | 12.5 ± 3.0 |
| 2-day | 35 (11.4) | 2,253 ± 570 | 15.5 ± 3.9 |
| Stress-only | 74 (24.1) | 644 ± 374 | 5.5 ± 4.4 |
| Stress–rest or rest–stress | 233 (75.9) | 1,713 ± 448* | 12.5 ± 2.7* |
| Overall, 49 of 307 (16%) patients received <5 mSv | 1,454 ± 629 | 10.9 ± 4.4 | |
| CTA | |||
| Retrospective | 126 (44.7) | 16.4 ± 3.3 | |
| Retrospective with dose modulation | 102 (36.2) | 12.0 ± 2.4 | |
| Prospective | 54 (19.1) | 5.2 ± 0.6 | |
| Overall, 20 of 282 (7.1%) patients received <5 mSv | 12.7 ± 4.9 |
↵* P < 0.0001 stress-only vs. stress–rest.
Data in parentheses are percentages.