2017_SBRT_Course Book

3D conformal treatment planning

• Isocenter placed in target • 7-11 fields spread as much as possible • Avoid directly opposing fields • Avoid entering a OAR (spinal cod, duodenum, bowel, kidneys). • Fit MLC to help structure

• MLC fit is 2mm longer (sup-inf) and 3 mm tighter (lat and AP) than the PTV

PTV

• Manual adjustements may be necessary, for example to sprare thoracic wall better

MLC fit