Leksell基环模拟固定系统的研制

LEKSELL BASE-RING ANALOG FIXED-SYSTEM

在头部伽玛刀的Leksell基环的固定中,经验的分析判断Leksell基环与该病人的颅脑病灶几何中心,有很重要的临床价值,但是临床中经常遇到病灶很低,或者多个病灶跨度很大等情形,致使很难找到Leksell基环与颅脑病灶几何中心最佳的空间关系和无法实现预定的治疗计划摆位.本文将颅脑耳眦平面以上部位抽象成一个可以等比例收缩的模型,然后借助计算机技术实现Leksell基环和该病人颅脑模型的虚拟模拟。尽可能的避免治疗头盔对Leksell基环的刚性限制,找到Leksell基环和该病人颅脑模型最佳的空间位置,记录相关的数据.然后拿这些数据指导临床.实验表明,该软件可以初步指导Leksell基环的固定.

To fix correctly Leksell Base-Ring of the Gamma Knife,alignment of the ring geometric center and the lesioned foci of the brain is of paramount clinical significance.It often happens,however,that lesioned loci are positioned very low,or there are multiple lesions rather spread out,making it hard to find good alignment of Leksell Base-Ring and the geometric center of lesions for treatment.In the present study,the head portion above the canthus ear line was hypothetically assumed to be proportionally contractable,to achieve computationally virtual Leksell Base-Ring and virtual brain.This will avoid rigidity limit of the Leksell Bese-Ring imposed by the helmet,to find suitable alignment between the Ring and the head.Experiments showed that this software gave a suitable guide for initial fixing of the Leksell Base-Ring.