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Table 4 - Correlations between the gamma passing rates and the MLC positional errors

From: Reliability of the gamma index analysis as a verification method of volumetric modulated arc therapy plans

Gamma criteria MapCHECK2 measurements ArcCHECK measurements
Global gamma passing rates Local gamma passing rates Global gamma passing rates Local gamma passing rates
r p r p r p r p
Trilogy (C-series linac)
 3%/3 mm 0.213 0.011 − 0.447 < 0.001 – – – –
 2%/2 mm – – − 0.183 0.031 0.307 < 0.001 −0.355 < 0.001
 2%/1 mm – – 0.190 0.025 0.536 < 0.001 − 0.211 0.013
 1%/2 mm − 0.334 < 0.001 – – 0.305 < 0.001 − 0.503 < 0.001
 1%/1 mm – – – – 0.546 < 0.001 −0.374 < 0.001
TrueBeam STx (SABR + non-SABR)
 3%/3 mm – – −0.339 0.001 – – −0.382 < 0.001
 2%/2 mm −0.358 < 0.001 −0.478 < 0.001 0.211 0.035 −0.369 < 0.001
 2%/1 mm −0.328 0.001 −0.394 < 0.001 0.458 < 0.001 −0.230 0.021
 1%/2 mm −0.554 < 0.001 −0.542 < 0.001 – – −0.478 < 0.001
 1%/1 mm −0.531 < 0.001 −0.502 < 0.001 0.316 0.001 −0.364 < 0.001
TrueBeam STx (non-SABR)
 3%/3 mm – – – – – – −0.699 < 0.001
 2%/2 mm −0.336 0.034 −0.475 0.002 – – −0.593 < 0.001
 2%/1 mm −0.507 0.001 −0.470 0.002 0.463 0.003 – –
 1%/2 mm −0.577 < 0.001 −0.584 < 0.001 – – − 0.619 < 0.001
 1%/1 mm − 0.740 < 0.001 − 0.622 < 0.001 0.348 0.028 −0.365 0.021
  1. Note: Only r values with p ≤ 0.05 are shown
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Radiation Oncology

ISSN: 1748-717X

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