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Table 5 Correlations of the averaged multi-leaf collimator positional errors to the modulation indices (p ≤ 0.05)

From: Assessment of the modulation degrees of intensity-modulated radiation therapy plans

 

TrueBeam STx

Trilogy

r s

p

r s

p

MIs

0.411

< 0.001

0.213

0.032

MIa

0.783

< 0.001

0.489

< 0.001

MIc, IMRT

0.887

< 0.001

0.504

< 0.001

MCS

–

–

−0.727

< 0.001

PA

0.841

< 0.001

0.909

< 0.001

PI

0.861

< 0.001

0.767

< 0.001

PM

–

–

0.751

< 0.001

  1. Note: rs Spearman’s rho, MIs Modulation index considering multi-leaf collimator speed, MIa Modulation index considering multi-leaf collimator acceleration, MIc, IMRT Modulation index considering multi-leaf collimator acceleration and field aperture irregularity for intensity modulated radiation therapy, MCS Modulation complexity score, PA Plan-averaged beam area, PI Plan-averaged beam irregularity, PM Plan-averaged beam modulation
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Radiation Oncology

ISSN: 1748-717X

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