Radiation Risk to Fetus
| Ranking (highest risk → lowest risk) | |||||||||
| Relative risk | Procedure | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| High | 18F-FDG PET/CT | 171* | 32 | 11 | 6 | 7 | 6 | 3 | 20 |
| Bone scanning with SPECT/CT of lumbar spine | 37 | 131* | 35 | 18 | 7 | 9 | 14 | 2 | |
| 99mTc-sestamibi myocardial perfusion scan | 18 | 49 | 102* | 31 | 21 | 12 | 13 | 5 | |
| Medium | Gated heart pool scan | 2 | 9 | 34 | 85* | 73 | 37 | 9 | 2 |
| Bone scan | 1 | 9 | 38 | 81 | 94* | 26 | 4 | 1 | |
| Low | Renal perfusion scan | 5 | 7 | 23 | 21 | 30 | 105* | 47 | 14 |
| Ventilation and perfusion lung scan | 10 | 12 | 4 | 6 | 12 | 37 | 93* | 81 | |
| 99mTc thyroid scan | 14 | 9 | 7 | 5 | 4 | 19 | 68 | 127* | |
↵* Correct ranking for each procedure, which was also correctly identified by most participants.