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Table 4 Summary of number of acceptable variation and/or unacceptable deviation according to RTOG dosimetric constraints criteria [22]

From: Quality assurance analysis of hippocampal avoidance in a melanoma whole brain radiotherapy randomized trial shows good compliance

  Per protocol
Number (%)
AV
Number (%)
UD
Number (%)
Comment
R hippocampus (n = 22) 16 (73%) 3 (14%) 3 (14%)  
L Hippocampus (n = 20) 17 (85%) 2 (10%) 1 (5%) 1 patient had AV on both hippocampi
Patients (n = 22) 16 (73%) 4 (18%) 4 (18%) 2 patients had UD on one hippocampus and AV on the second hippocampus
Optic nerves (n = 22) 22 (100%) 0 0  
Chiasm (n = 22) 22 (100%) 0 0
Unscheduled break 19 (86%) 3 (14%) 0
  1. AV Acceptable variation, L Left, PTV Planning target volume, R Right, UD Unacceptable deviation