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Table 2 SRS treatment parameters

From: Spinal radiosurgery - efficacy and safety after prior conventional radiotherapy

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