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. 2013 Oct 14;8:237. doi: 10.1186/1748-717X-8-237

Table 4.

Comparison of delivery efficiency in all four radiotherapy plan groups

  VMAT1 VMAT2 dIMRT ssIMRT pGLM-u pVMAT1 -VMAT2 pVMAT1 -dIMRT pVMAT1 -ssIMRT pVMAT2 -dIMRT pVMAT2 -ssIMRT pdIMRT -ssIMRT
MUs
 1232.1 ± 146.2
 1349.9 ± 133.8
 1292.2 ± 120.7
 1090.2 ± 91.1
 <0.001
 0.001
 0.067
 <0.001
 0.079
 <0.001
 <0.001
Time (min)
 2.7 ± 0.2
 3.9 ± 0.3
 5.7 ± 0.2
 14.1 ± 1.0
 <0.001
 <0.001
 <0.001
 <0.001
 <0.001
 <0.001
 <0.001
Mean dose rate (MU/min)
 494.0 ± 38.6
 379.6 ± 30.1
 249.8 ± 17.9
 86.6 ± 5.1
 <0.001
 <0.001
 <0.001
 <0.001
 <0.001
 <0.001
 <0.001
Control points
 161.4 ± 13.1
 187.0 ± 30.9
 126.6 ± 10.2
 138.0 ± 10.4
 <0.001
 <0.001
 <0.001
 <0.001
 <0.001
 <0.001
 0.223
plan calculation time (hour) 5.6 ± 1.4 4.8 ± 1.2 0.8 ± 0.3 0.8 ± 0.4 <0.001 0.092 <0.001 <0.001 <0.001 <0.001 0.945

GLM-u: general linear model-univariate; VMAT1: single arc VMAT, VMAT2: dual arc VMAT; dIMRT: dynamic MLC IMRT; ssIMRT: step-and-shoot IMRT. “Bold numbers” means that p value has a statistically significance.