Comparison of a MLC calibration method using a diode array and electronic portal imaging device

被引:0
|
作者
Simon, T.
Fox, C.
Li, J.
Palta, I.
Simon, W.
Liu, C.
机构
[1] Univ Florida, Gainesville, FL USA
[2] Sun Nucl Corp, Melbourne, FL USA
关键词
D O I
10.1118/1.2760373
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Purpose: Current methods of MLC calibration and quality assurance include the use of graph paper, scanning water tanks, ion chambers, film and EPIDs; these methods can be both laborious and/or non‐quantitative. We propose a convenient and quantitative method for calibrating and performing routine quality assurance for MLCs. Method and Materials: The Profiler 2 (Sun Nuclear Corp., Melbourne, FL), a two dimensional diode array, was visually aligned to the backup jaw and irradiated with an Elekta linac. The backup jaw served as a radiation reference line and was used to determine the positional diode offsets. The MLC was stepped over the Profiler 2 and the 50% position for each diode was determined. Leaf offsets were calculated by offsetting each diodes 50% position by the 50% position of the diode corresponding to leaf pair 20 and subtracting the corresponding positional diode offset. This method was repeated with an EPID for comparison purposes. Results: Linear dose changes of approximately 15%/mm and 13.5%/mm were observed in the penumbras of the backup jaw and MLC, respectively. Leaf positions measured by the EPID and Profiler 2 differed on average by ± 0.12 mm per leaf. Leaf reproducibility of 0.36 mm or better was observed and minimal reproducibility changes were seen with the backup jaw. Conclusion: This work demonstrates the potential of the Profiler 2 as a tool for calibrating and performing quantitative QA for MLC leaf positioning. The Profiler 2 methods are fast, taking an average of 20 minutes to perform and accurately represent leaf positions and reproducibility. Conflict of Interest: This work was supported in part by SBIR Contract No. HHSN261200522014C, ADB Contract No. N43‐CM‐52214, the University of Florida and Sun Nuclear Corporation. © 2007, American Association of Physicists in Medicine. All rights reserved.
引用
收藏
页码:2337 / 2337
页数:1
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