Table 2 SRS treatment parameters
From: Spinal radiosurgery - efficacy and safety after prior conventional radiotherapy
Parameter | Value |
|---|---|
Prescription dose (Gy) 70% isodose | Â |
   Median | 18 |
   Mean | 18.1 |
   Range | 10-28 |
   95% C.I. | 17-18 |
Dose maximum (GTV) | Â |
   Median | 25.7 |
   Mean | 26.8 |
   Range | 20-43 |
   95% C.I. | 23.9-28.6 |
Dose minimum (GTV) | Â |
   Median | 12.2 |
   Mean | 12 |
   Range | 3.8-20.3 |
   95% C.I. | 11.4-12.7 |
Peripheral isodose (%) | Â |
   Median | 70 |
   Mean | 67 |
   Range | 50-80 |
   95% C.I. | 65-70 |
No. of beams/site or lesion | Â |
   Median | 215 |
   Mean | 207 |
   Range | 64-341 |
   95% C.I. | 182-239 |
10 Gy irradiated volume (cc) | Â |
   Median | 95 |
   Mean | 120 |
   Range | 0.6-479 |
   95% C.I. | 63-132 |
> 8 Gy volume of spinal cord (cc) | Â |
   Median | 0.74 |
   Mean | 1.4 |
   Range | 0-9.3 |
   95% C.I. | 0.4-1.2 |