Evaluation on repeatability of the aperture sizes of CyberKnife VSITM Iris collimator

VernacularTitle:射波刀Iris可变准直器孔径大小的重复性评价
Author: Jing YANG ; Mi CHEN ; Zhiwen LIANG ; Bin HU ; Junping CHENG ; Qin LI
Publication Type:Journal Article
Keywords: CyberKnife; Iris variable aperture collimator; Film
From: Chinese Journal of Radiological Medicine and Protection 2016;36(4):291-293
CountryChina
Language:Chinese
Abstract: Objective To evaluate the repeatability of the aperture sizes based on the Iris variable aperture collimator (Iris collimator) of CvberKnife VSITM.Methods Radiochromic films were placed at 800 mm of source-to-axis distance (SAD),and Iris quality assurance (QA) software was used to extract the information from the digital images,which were exposured by X-ray beams.Results The average aperture accuracy of Iris collimator was better than 0.11 mm over the beam range 5-40 mm,and the accuracy for 50 mm and 60 mm beams was within 0.19 mm.Conclusions The results suggest a good repeatability of aperture sizes for the CyberKnife VSITM Iris collimator.