Clinical Study
Stereotactic Body Radiotherapy as an Alternative to Brachytherapy in Gynecologic Cancer
Table 2
Target and OAR definitions.
| Structure | Definition |
| GTV | Gross tumor as visualized on MRI (T2) and physical exam | CTV | Entire cervix for most patients, including extracervical disease if present on pre-SBRT MRI | PTV | CTV plus expansion of 5 mm (using less of an expansion if adjacent to organs at risk) | Rectum | Entire rectum, superior limit will be rectosigmoid junction | Bladder | Entire bladder and contents | Small bowel | Bowel loops up to 2 cm above target |
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