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 |