Research Article

Similar-Case-Based Optimization of Beam Arrangements in Stereotactic Body Radiotherapy for Assisting Treatment Planners

Table 3

Mean standard deviation of the planning evaluation indices in 50 treatment plans of 10 test cases obtained from the dose distributions of similar-case-based beam arrangements without and with the beam direction optimization.

Similar-case-based
beam arrangement
Optimized similar-case-based beam arrangementP value

PTV
 D95 (Gy) 0.135
 Homogeneity index 0.023
 Conformity index 0.001
 TCP (%) 0.259
Lung
 V5 (%) 0.248
 V10 (%) < 0.001
 V20 (%) < 0.001
 Mean dose (Gy) < 0.001
 NTCPlung (%) 0.020
Spinal cord
 Maximum dose (Gy) 0.291
 NTCPspinal cord (%) 0.532

PTV: planning target volume; TCP: tumor control probability; NTCP: normal tissue complication probability.