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Table 1 Evaluation parameters of leaf positioning errors for IMRT and VMAT plans on the three accelerators

From: Comparison of MLC positioning deviations using log files and establishment of specific assessment parameters for different accelerators with IMRT and VMAT

  

95th error (mm)

Max RMS error(mm)

Max leaf speed (mm/s)

Mean leaf speed (mm/s)

Fail leaves number

Trilogy

IMRT

0.65 ± 0.17

0.44 ± 0.10

22.41 ± 2.21

3.50 ± 1.14

4.88 ± 4.40

VMAT

1.08 ± 0.21

0.79 ± 0.07

35.40 ± 2.93

7.88 ± 0.64

21.07 ± 7.01

TrueBeam

IMRT

0.04 ± 0.01

0.03 ± 0.01

22.58 ± 1.95

1.64 ± 0.91

0

VMAT

0.05 ± 0.01

0.03 ± 0.01

23.23 ± 2.60

4.14 ± 1.65

0

Halcyon

IMRT

0.08 ± 0.02

0.05 ± 0.01

55.72 ± 1.29

3.00 ± 1.19

0

VMAT

0.09 ± 0.01

0.07 ± 0.01

58.86 ± 1.06

11.92 ± 3.29

0

  1. IMRT intensity-modulated radiation therapy, VMAT volumetric-modulated arc therapy