Table 4.
The DRLs for adult CT (standard body weight is 50–70 kg)
| Protocol | DRLs 2015 [4] | DRLs 2020 [5] | ||
|---|---|---|---|---|
| CTDIvol [mGy] | DLP [mGy・cm] | CTDIvol [mGy] | DLP [mGy・cm] | |
| General CT | ||||
| Routine brain | 85 | 1350 | 77 | 1350 |
| Routine chest | 15 | 550 | 13 | 510 |
| Chest to pelvis | 18 | 1300 | 16 | 1200 |
| Abdomen and pelvis | 20 | 1000 | 18 | 880 |
| Liver, multi-phase | 15 | 1800 | 17 | 2100 |
| Coronary CTA | 90 | 1400 | 66 | 1300 |
| Acute pulmonary thromboembolism and deep vein thrombosis | n/a | n/a | 14 | 2600 |
| Whole body CT for trauma | n/a | n/a | n/a | 5800 |
| SPECT/CT (attenuation correction only) | ||||
| Brain | n/a | n/a | 13.0 | 330 |
| Heart | n/a | n/a | 4.1 | 85 |
| SPECT/CT (Attenuation correction and image fusion) | ||||
| Whole body | n/a | n/a | 5.0 | 380 |
| Brain | n/a | n/a | 23.0 | 410 |
| Head and neck | n/a | n/a | 5.8 | 210 |
| Chest | n/a | n/a | 4.1 | 170 |
| Heart | n/a | n/a | 4.5 | 180 |
| Abdomen, pelvis | n/a | n/a | 5.0 | 210 |
| Extremities | n/a | n/a | 4.6 | 230 |
| PET/CT (Attenuation correction and image fusion) | ||||
| Whole body (medical examination) | n/a | n/a | 6.1 | 600 |
| Whole body (medical checkup) | n/a | n/a | 5.5 | 550 |
| Brain (medical examination) | n/a | n/a | 31.0 | 640 |
| Heart (medical examination) | n/a | n/a | 9.1 | 380 |