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Table 1 Gradients of best-fitting lines by linear regression of the absolute passing rates vs. MLC misalignments

From: The sensitivity of gamma-index method to the positioning errors of high-definition MLC in patient-specific VMAT QA for SBRT

  1%/1 mm 1.5%/1.5 mm 1%/2 mm 2%/1 mm 2%/2 mm
Class Out (mm/%)
MapCHECK2 Lung -37.7 -29.8 -30.3 -32.4 -15.5
  Spine -41.5 -16.0 -22.6 -27.8 -5.1
EBT2 Lung -31.6 -36.5 -30.8 -39.5 -26.3
  Spine -28.0 -34.2 -30.9 -35.4 -29.5
Class In (mm/%)
MapCHECK2 Lung -37.9 -26.5 -24.3 -33.1 -10.9
  Spine -41.1 -24.4 -20.4 -35.4 -12.6
EBT2 Lung -30.5 -36.2 -32.6 -38.0 -30.1
  Spine -28.3 -31.4 -28.2 -33.6 -25.8
Class Shift (mm/%)
MapCHECK2 Lung -12.4 -9.6 -7.9 -11.3 -5.2
  Spine -8.3 -3.9 -3.4 -5.9 -2.5
EBT2 Lung -9.4 -8.4 -6.6 -11.0 -5.8
  Spine -7.5 -7.1 -6.0 -8.3 -5.2
  1. Abbreviation: MLC multi-leaf collimator A higher absolute gradient means the test criteria are more sensitive to detect MLC misalignments.