SRS Planning
RTOG Gamma Knife Regimens
Pathology Selection
Radiation Therapy Oncology Group (RTOG) Validated Regimens.
Prescription Protocol
< 2 cm
24 Gy
Prescribed to 50% isodose line.
2.1 - 3.0 cm
18 Gy
Prescribed to 50% isodose line.
3.1 - 4.0 cm
15 Gy
Prescribed to 50% isodose line.
> 4.0 cm
FSRT
Consider fractionation or surgery.
Clinical Warning
Final prescription depends on distance to critical structures (OARs) and prior radiation history.
Guidelines & Evidence
Verified
Last Review: 2026
Last Comprehensive Review: 2026
