Indications for CT Contrast Agents in Combined PET/CT
| PET/CT indication | Full-dose CT with intravenous and oral contrast* | Low-dose CT without contrast |
|---|---|---|
| Staging and restaging | ||
| Tumor staging | R | INA |
| Tumor restaging | R | INA |
| Therapy planning | ||
| RT planning: head and neck, abdomen, pelvis | R | INA |
| RT planning: thorax | RTI | R |
| Surgical planning | R | INA |
| Interventional planning: separate contrast-enhanced CT available | INA | R |
| Interventional planning: no contrast-enhanced CT available | R | INA |
| Therapy control | ||
| Chemotherapy/irradiation) | INA | R |
| Surgical/interventional) | INA | R |
R = recommended; RT = radiation therapy; RTI = recommended if tumor invasion into mediastinum is suspected; INA = for indication not appropriate.
↵* Oral contrast applicable when abdomen in the field of view.