The effect of MLC speed and acceleration on the plan delivery accuracy of VMAT

The British Journal of Radiology
Jong Min ParkK Kim

Abstract

To determine a new metric utilizing multileaf collimator (MLC) speeds and accelerations to predict plan delivery accuracy of volumetric modulated arc therapy (VMAT). To verify VMAT delivery accuracy, gamma evaluations, analysis of mechanical parameter difference between plans and log files, and analysis of changes in dose-volumetric parameters between plans and plans reconstructed with log files were performed with 40 VMAT plans. The average proportion of leaf speeds ranging from l to h cm s(-1) (Sl-h and l-h = 0-0.4, 0.4-0.8, 0.8-1.2, 1.2-1.6 and 1.6-2.0), mean and standard deviation of MLC speeds were calculated for each VMAT plan. The same was carried out for accelerations in centimetre per second squared (Al-h and l-h = 0-4, 4-8, 8-12, 12-16 and 16-20). The correlations of those indicators to plan delivery accuracy were analysed with Spearman's correlation coefficient (rs). The S1.2-1.6 and mean acceleration of MLCs showed generally higher correlations to plan delivery accuracy than did others. The highest rs values were observed between S1.2-1.6 and global 1%/2 mm (rs = -0.698 with p < 0.001) as well as mean acceleration and global 1%/2 mm (rs = -0.650 with p < 0.001). As the proportion of MLC speeds and accelerations >0.4...Continue Reading

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Citations

Oct 30, 2015·The British Journal of Radiology·Conor K McGarryCatharine H Clark
Oct 1, 2015·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Jong In ParkSung-Joon Ye
Sep 1, 2017·Journal of Applied Clinical Medical Physics·Steffi KantzMichael Reiner
Jul 12, 2019·The British Journal of Radiology·Sophie ChiavassaAlexandra Moignier
Sep 1, 2015·Physics in Medicine and Biology·Jong Min ParkHyoungnyoun Kim
Mar 8, 2016·Physics in Medicine and Biology·Joel N K CarlsonSung-Joon Ye
Oct 24, 2018·Journal of Biomedical Optics·Brian W Pogue, Brian C Wilson
Dec 25, 2019·Radiation Oncology·Jong Min ParkSo-Yeon Park
May 1, 2019·Journal of Applied Clinical Medical Physics·Jong Min ParkSo-Yeon Park
Oct 14, 2020·Journal of Applied Clinical Medical Physics·Jiayun ChenJianrong Dai
Nov 28, 2020·Physics in Medicine and Biology·Le WangJing Sui
Aug 19, 2020·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·William M GilesJustus D Adamson

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