Table 1.
Suggested NDRL and achievable doses for PET/CT and SPECT/CT examinations according to clinical purpose (Mean DLP data (not weight-derived) normalised to a 16-cm CTDI phantom are given for PET/CT brain; NDRL and achievable doses are not presented for PET/CT oncology diagnostic CT scans as standalone diagnostic NDRLs should be used for comparison)
| Examination | Clinical purpose | Suggested NDRL (75th percentile) | Achievable dose (50th percentile) | ||
|---|---|---|---|---|---|
| CTDIvol (mGy) | DLP (mGy.cm) | CTDIvol (mGy) | DLP (mGy.cm) | ||
| PET/CT oncology | Localisation/characterisation | 2.9 | 310 | 2.6 | 258 |
| PET/CT infection/inflammation | Localisation/characterisation | 3.5 | 431 | 2.5 | 326 |
| PET/CT brain | AC only | 6.4 | 148 | 5.7 | 104 |
| PET/CT and SPECT/CT cardiac | AC only | 2.2 | 53 | 1.6 | 35 |
| SPECT/CT lung | Localisation/characterisation | 2.9 | 117 | 2.5 | 89 |
| SPECT/CT bone (main body) | Localisation/characterisation | 4.0 | 215 | 2.0 | 108 |
| SPECT/CT parathyroid | Localisation/characterisation | 5.7 | 199 | 3.5 | 131 |