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Table 6 - Correlations between the gamma passing rates and the MU delivery 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

− 0.304

< 0.001

− 0.251

0.003

 2%/2 mm

−0.191

0.024

−0.183

0.030

−0.312

< 0.001

 2%/1 mm

−0.238

0.005

−0.323

< 0.001

 1%/2 mm

−0.211

0.012

−0.305

< 0.001

 1%/1 mm

−0.216

0.010

−0.330

< 0.001

TrueBeam STx (SABR + non-SABR)

 3%/3 mm

−0.270

0.007

 2%/2 mm

0.236

0.018

−0.317

0.001

 2%/1 mm

− 0.336

0.001

 1%/2 mm

0.243

0.015

TrueBeam STx (SABR)

 3%/3 mm

−0.546

< 0.001

− 0.398

0.002

 2%/2 mm

− 0.456

< 0.001

− 0.425

0.001

 2%/1 mm

−0.452

< 0.001

− 0.581

< 0.001

− 0.519

< 0.001

 1%/2 mm

− 0.491

< 0.001

− 0.441

< 0.001

− 0.422

0.001

 1%/1 mm

− 0.625

< 0.001

− 0.583

< 0.001

− 0.496

< 0.001

TrueBeam STx (non-SABR)

 1%/2 mm

0.343

0.030

0.323

0.042

 1%/1 mm

0.369

0.019

  1. Note: Only r values with p ≤ 0.05 are shown