Design and development of an add-on automated multi-leaf collimator for telecobalt therapy machine and study of its characteristics

A. R. Rani, K. Ayyangar, A. R. Reddy, A. Kumar, P. Y. Reddy
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引用次数: 3

Abstract

Purpose: The purpose of the paper is to present the design, development and dosimetric characteristics of an automated Multi-leaf collimator (MLC) integrated along with an inexpensive Treatment Planning System (ROPS), developed for existing telecobalt units as an add-on without making any modifications to the treatment machine. Method: The prototype MLC design consists of 28 tungsten alloy leaves (14 leaf pairs) having a mass density of 18 g cm -3 . Each of the leaves projects 10 mm width at the isocenter, which is at 80 cm from the source. The automation has been achieved with a dedicated linear actuator for each leaf. Radiochromic films and IC PROFILER™ (Sun Nuclear Corporation, Melbourne, FL) were used for the measurement of beam profiles and the profiles were analyzed to arrive at radiation field width, beam flatness, symmetry and beam penumbra. Results: The prototype MLC can define radiation fields of up to 14 × 14 cm² within the prescribed tolerance values of 2 mm. The flatness and symmetry were found to be within the prescribed tolerance value of 3%. The penumbra for a 10 × 10 cm² field size is 9.5 mm which is less than the generally acceptable value of 12 mm for a telecobalt machine. The maximum leakage through the leaf ends in closed condition was observed to be 7.3% which is less than the values reported for other MLCs designed for medical linear accelerators. Conclusion: It is concluded that dosimetric parameters and the leakage radiation of the prototype MLC are well below their recommended tolerance values. The MLC can be used for carrying out conformal radiotherapy with existing telecobalt machines.
远程钴疗机附加自动多叶准直器的设计与研制及其特性研究
目的:本文的目的是介绍一种自动化多叶准直仪(MLC)的设计、开发和剂量学特性,该准直仪集成了一种廉价的治疗计划系统(ROPS),该系统是为现有的远程钴单元开发的,作为附加组件,无需对治疗机进行任何修改。方法:采用质量密度为18 g cm -3的28片钨合金叶片(14对叶片)组成MLC原型设计。每片叶子在离源80厘米的等心处投射出10毫米的宽度。自动化已经实现了一个专用的线性执行器为每个叶片。使用放射致色膜和IC PROFILER™(Sun Nuclear Corporation, Melbourne, FL)测量光束轮廓,并对这些轮廓进行分析,以获得辐射场宽度、光束平坦度、对称性和光束半影。结果:原型MLC可以在2mm的规定公差范围内定义最大14 × 14 cm²的辐射场。平整度和对称性均在3%的公差范围内。10 × 10 cm²场尺寸的半影为9.5 mm,小于远程钴机通常可接受的12 mm值。在封闭条件下,通过叶片末端的最大泄漏量为7.3%,低于为医用线性加速器设计的其他MLCs的报告值。结论:样品MLC的剂量学参数和泄漏辐射均低于推荐容限值。MLC可用于与现有的远程钴机进行适形放疗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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