【作者】 胡瑛；

【导师】 李佳；

【作者基本信息】 天津大学 ， 机械制造及其自动化， 2006， 硕士

【摘要】 为了保证肿瘤放射治疗的效果,要求在治疗肿瘤的同时尽量降低对健康细胞的损害,控制放射线覆盖范围达到一定的精确程度,即采用适形放疗。目前,临床上采用的多叶光栅和铸造铅模适形方法不能保证适形的精确性,同时又有各自的缺点。本文将计算机辅助设计技术应用到数字化适形铅模的设计过程中,克服上述两种方法的缺点,提高适形精度。论文结合数字化射野适形铅模技术的开发,对其中的适形铅模设计技术进行研究。针对适形铅模的几何形状,采用B-样条曲线和直纹面的数学模型表述铅模端面曲线和侧面,结合所使用放疗设备的结构参数,用参数设计的方法,确定铅模上下表面的轮廓,得到适形铅模的数学模型。论文针对制模技师的实际需要开发了基于ACIS的数字化适形铅模设计系统。系统采用面向对象的编程方法进行分析和设计,将问题域的铅模模型和软件系统中的模型直接映射,并使用动态链接库技术实现软件功能,利用精确几何造型平台ACIS强大的造型功能,实现适形铅模的造型和可视化的用户界面。最后,以人体心脏的X光片轮廓为例,实际验证了本文开发的该设计技术和软件,输出结果表明该软件达到了成像可靠,运算速度高,简单易用的目标。更多还原

【Abstract】 Radiotherapy is a branch of medical science which uses radiation, predominantly to treat malignant disease. The aim of radiotherapy technique is to improve the carcinogenic cell destruction while reducing at best the undesirable effects onto the neighboring healthy tissue. Conformal radiotherapy can reach this aim perfectly. One way to treat carcinogenic cell is coupled grating, the other is casting lead block. Unfortunately, there are disadvantages in these two methods respectely. To overcome these problems the digital conformal lead block technology is proposed, and computer aided design technology is applied in the field in this dissertation.The technology for designing the conformal lead block is a part of technique development work of the digital conformal lead block technology. The dissertation points out two important sections in design stage, which includes modeling and ACIS based structuring. According to characters of the conformal lead block shape,ruled surface and B-Spline curve are used to express the side shape of the conformal lead block and profiles of the two end planes, respectively.In the dissertation, the system for ACIS based conformal lead block design technology has been developed and the aim is at the actual demand of the clinic equipment. The system is designed with the object-oriented theory, and is realized by means of programming language Visual C++6.0 and graphics software ACIS.In the last step, with a practical machining sample application to the technology development, the system is prove to be accurate and feasible in this paper.更多还原