基于片段融合的医学图像光线投影体绘制技术  

Ray Casting Volume Rendering of Medical Images Using Segment Composition

作　　者：徐玲[1] 钱志余[1] 陶玲[1] 

机构地区：[1]南京航空航天大学自动化学院生物医学工程系,南京210016

出　　处：《生物医学工程研究》2009年第3期171-174,共4页Journal Of Biomedical Engineering Research

基　　金：国家高技术研究发展计划资助(863计划)(2007AA02Z4A9)项目

摘　　要：光线投影算法是医学图像三维可视化中常用的体绘制技术,算法原理简单,具有较高的成像质量,但绘制速度较慢。我们改进算法,利用投射光线与平面簇求交,快速确定融合片段,减少插值计算量,采用基于片段的融合绘制技术,加快融合速度,并且利用包围盒技术减少对无效平面的求交,提高了光线投影的效率。实验结果表明,改进后的算法既能保证绘制质量,又能显著减少计算量,提高体绘制的速度。We presented an improved fast algorithm of ray casting volume rendering. Our algorithm could figure out composition segment fleedy and reduce interpolation caleulation by intersection computation of the ray and a family of planes. Taken advantage of segment composition method, the composition velocity, was accelerated. And utilizing boundary box technique, the algorithm avoided intersection eomputation with useless planes and greatly improved the efficiency of ray casting. The experiment results show that the improved acceleration algorithm can prodoce the required quuality images, at the same time reduces the total operations remarkably, and speeds up the volume rendering.

关 键 词：体绘制 医学图像 光线投影算法 平面簇求交 片段融合 

分 类 号：R318[医药卫生—生物医学工程] TP391.41[医药卫生—基础医学]