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Table 1 Mechanical performance metrics

From: Mechanical performance of a commercial knowledge-based VMAT planning for prostate cancer

Mechanical performance metrics

Abbreviation

Description

1

Mean field area

MFA

Mean of the field area weighted according to the MU at each control point

2

Mean asymmetry distance

MAD

Mean lateral distance between open MLC leaf pairs apertures and the central axis

3

Cross-axis score

CAS

Proportion of MLC leaf pairs crossing the central axis within the jaw aperture

4

Closed leaf score

CLS

Proportion of MLC leaf pairs entirely closed within the jaw aperture

5

Small aperture score

SAS

Proportion of open MLC leaf pairs separated by less than the given thresholds (2, 5, 10, and 20 mm in this study)

6

Leaf travel

LT

Averaged over all in-field moving leaves

7

Modulation complexity score for VMAT

MCSv

Sum over all control points of the product of the aperture area variability (AAV), leaf sequence variability (LSV), and normalized MU

8

Monitor unit

MU

Sum of monitor unit value for a plan