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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