放射治疗计划软件中等剂量线跟踪技术

摘要

Background and purpose: To get the best treatment in radiation therapy, it needs to increase the dose delivery to the tumor maximization, while limit the dose to tissues and organs. Isodose lines are the most important indicators in treatment plan evaluation. In order to acquire the isodose lines within the patient scanning slices, it need to calculate the voxels 'dose in the patient's body, which takes large computation time. The aim of the study is to get a rapid isodose lines tracing algorism to meet the requirement of patient's dose distributing evaluation in clinical applications. Methods: This paper mainly analyzed the contour tracing technology based on binary image, and present an 8-connected isodose line tracing algorithm. Applying this algorism, together with a "Calculating While Tracing" method, we realized an isoline dose tracing technology in the radiation therapy plan system. Results: 8-connected algorism can decrease the searching points in contour tracing procedure, worked with the "Calculating While Tracing" method, it can decrease the amount of dose calculating voxels and speed up the isodose line tracing greatly. Conclusions: Experiments show that this improved algorithm can acquire isodose line quickly, and meet the requirements in clinical applications.%背景与目的:放射治疗需要最大限度地提高肿瘤的放射剂量并尽可能减少正常组织所受到的剂量,以达到最佳的放疗效果.在制定治疗计划过程中,等剂量线是评估剂量分布的最重要的指标,为获得病人断层内的等剂量线,需要计算病人体素的剂量,该工作计算量大,耗费时间长.本研究旨在得出一种快速的等剂量线分布跟踪算法,以满足临床上对病体内放射剂量分布进行评价的需要.方法:本文研究了基于二值图的轮廓跟踪技术,采用基于8邻域法的等剂量线跟踪算法,结合"边计算、边跟踪",实现了治疗计划软件中的等剂量线跟踪技术.结果:8邻域法可以减少轮廓跟踪过程中的搜索点,结合"边计算、边跟踪"的方法,减少了剂量计算的体索点数,大大提高等剂量线跟踪的速度.结论:试验表明,使用本研究所提出的等剂量跟踪技术,能够较快地获得等剂量线,完全符合临床应用的要求.