本文選題：擴充型動態(tài)楔形板　切入點：楔形因子　出處：《南方醫(yī)科大學(xué)學(xué)報》2015年02期 　論文類型：期刊論文

【摘要】：目的研究瓦里安擴充型動態(tài)楔形板楔形因子計算修正方法,比較楔形野中心點處手工和治療計劃系統(tǒng)計算結(jié)果相對測量結(jié)果的劑量/跳數(shù)差異。方法對于瓦里安直線加速器的6 MV、10 MV光子線,使用指形電離室測量水下10 cm處不同動態(tài)楔形野的楔形因子及射野中心點的劑量,采用治療計劃系統(tǒng)計算相應(yīng)射野的劑量/跳數(shù)。使用加速器輸出分割模型手工計算射野的楔形因子,并采用常數(shù)因子修正手工計算結(jié)果。對手工計算、治療計劃系統(tǒng)計算和測量結(jié)果進行比較,分析三種方法下常規(guī)二維治療計劃下動態(tài)楔形野的楔形因子和射野中心點跳數(shù)的誤差。結(jié)果以測量結(jié)果為標準,校正后,手工計算的楔形因子誤差明顯減小。其中,6 MV光子線下,60°楔形角下對稱野最大相對誤差由4.2%減小到1.3%,非對稱野最大相對誤差由-4.7%減小到-1.8%。10 MV所有楔形野相對誤差由最大-3.0%降低到1.1%。手工計算跳數(shù)與測量結(jié)果對比,對稱野相應(yīng)射野跳數(shù)計算相對誤差在2%以內(nèi),但部分非對稱野最大相對誤差超過5%。比較治療計劃系統(tǒng)計算結(jié)果與測量結(jié)果,其最大相對誤差小于1.5%。結(jié)論使用常數(shù)因子可以有效減小輸出分割模型計算楔形因子的誤差。對于常規(guī)二維治療計劃楔形野的跳數(shù)計算來說,校正后對稱野射野中心點的計算結(jié)果符合臨床治療要求,但對于射野邊緣與等中心最短距離小于4 cm的非對稱野來說,需要使用相應(yīng)的非對稱射野處方劑量計算方法,或者采用測量方法或利用治療計劃系統(tǒng)計算相應(yīng)的射野跳數(shù)。
[Abstract]:Aim to study a modified method for calculating the wedge factor of Varian expansion type dynamic wedge plate. The difference of dose / hops between manual and therapeutic planning system calculation results relative to the measured results at the center point of wedge field was compared. Methods for the 6 MV 10 MV photon line of Varian linear accelerator, The wedge factor of different dynamic wedge fields and the dose of the center point of the field were measured by using the finger ionization chamber at the depth of 10 cm below the water. The dose / hops of the corresponding field are calculated by the treatment planning system. The wedge factor of the field is calculated manually by using the accelerator output partition model, and the result is corrected by the constant factor. The calculated and measured results of the treatment planning system are compared, and the errors of the wedge factor of the dynamic wedge field and the number of hops at the center of the field under the conventional two dimensional treatment plan are analyzed under the three methods. The error of wedge factor calculated by hand is obviously reduced, in which the maximum relative error of symmetric field at 60 擄wedge angle is reduced from 4.2% to 1.3, and the maximum relative error of asymmetric field is reduced from -4.7% to -1.8 .10 MV relative error of all wedge fields. From the maximum of -3.0% to 1.1. The number of hops calculated by hand is compared with the measured results. The relative error of the calculation of the corresponding field hops of symmetric field is less than 2%, but the maximum relative error of partial asymmetric field is more than 5. The calculated results of the treatment plan system are compared with the measured results. The maximum relative error is less than 1.5. Conclusion using constant factor can effectively reduce the error of calculating wedge factor in output segmentation model. The calculated results of the center point of the symmetrical field after correction accord with the requirement of clinical treatment. However, for the asymmetric field with the shortest distance from the edge of the field to the isocenter less than 4 cm, it is necessary to use the corresponding method to calculate the dose of the asymmetric field prescription. Either the measurement method or the treatment plan system is used to calculate the corresponding field jump.
【作者單位】： 中山大學(xué)腫瘤防治中心//華南腫瘤學(xué)國家重點實驗室//腫瘤醫(yī)學(xué)協(xié)同創(chuàng)新中心;
【基金】：國家自然科學(xué)基金(81272486) 廣東省教育部產(chǎn)學(xué)研重點項目(2012B091000144)~~
【分類號】：TH774

【相似文獻】

相關(guān)期刊論文 前8條

1 雒書朋;王麗玲;;電動楔形板的楔形因子計算方法[J];醫(yī)療衛(wèi)生裝備;2006年06期

2 朱煜和;易忠誠;肖志季;胡琳;趙艷群;;等中心照射楔形因子變化規(guī)律的分析[J];中國輻射衛(wèi)生;2012年01期

3 柏晗;王麗;崔建國;趙彪;潘香;;Elekta Motorized Wedge 6MV X-ray楔形因子特性的初步研究[J];中國醫(yī)學(xué)物理學(xué)雜志;2012年04期

4 陳亮,李玉民,許紅;瓦里安加速器擴充型動態(tài)楔形板楔形因子特性研究[J];中華放射腫瘤學(xué)雜志;2004年01期

5 胡杰;陶建民;張瑩;張穎;;直線加速器楔形因子的影響因素和修正方法[J];北京生物醫(yī)學(xué)工程;2007年02期

6 劉振桁;楊文;吳弟群;曹洋;唐武兵;;動態(tài)楔形因子在腫瘤放射治療臨床劑量計算中的應(yīng)用[J];中國醫(yī)學(xué)物理學(xué)雜志;2012年03期

7 劉江;;SIEMENS PRIUMS M 5176直線加速器物理楔形及動態(tài)楔形分析[J];航空航天醫(yī)學(xué)雜志;2013年08期

8 李俊萍;王勇;;放療輔助產(chǎn)品對射線的劑量學(xué)影響[J];醫(yī)療裝備;2007年10期

，

本文編號：1583383