Impact of accelerator's gantry angle on multi-leaf collimator position accuracy
10.3760/cma.j.issn.1004-4221.2009.04.317
- VernacularTitle:加速器机架角度对多叶准直器叶片到位精度的影响
- Author:
Shengpeng JIANG
;
Zhihua LI
- Publication Type:Journal Article
- Keywords:
Intensity modulated radiotherapy;
Gantry angle;
Multi-leaf collimator;
Positionaccuracy
- From:
Chinese Journal of Radiation Oncology
2009;18(4):317-320
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the impact of accelerator's gantry angle on MLC position accuracy. Methods Kodak X-omat-V Films were used, appropriate multi-leaf collimator positions and gantry angles were chosen, precise setup was needed , and the exposal films were analyzed by RIT113 software. Results At all conditions, most of the leaf position errors were less than 0. 5 mm. There were 2 pairs of leaf position errors larger than 1 mm when the gantry angle was 270° and the leaves moved from left to right. Conclu-sions Gantry angle can affect the accuracy of multi-leaf collimator position. Gravity and inertia increase the uncertainty of leaf position accuracy. Prieise setup is critical for the dose measurement.
