一种基于椭圆形断层图像分析的左心室模型 - 深圳大学.PDF

162 V o l. 16 No . 2 2001 6 J our nal o f Data A cqu s t on Pr ocess ng Jun . 2001 : 1004 -90 37 ( 200 1) 02-0170 -06 1) 2) 1) 纪　震 　蒋一峰 　张基宏 ( 1) , 518060) ( 2) , 7 10049) 建立了一个新的基于椭圆断层图像的左心室模型。该模型将左心室的断层面采用椭圆来描 述, 整 个左心室就 价于足够密集的椭圆断层之和。将C 臂进行多次旋转, 获得左心室在不同角度 下的投影图, 以数值方法求解出最佳的断层参数, 从而计算出左心室的体积。实验证明了在左心室 造影术中, 该模型能够明显地提高左心室定量分析的计算精度, 优于传统的椭圆体模型。本文详细 讨论了该模型中存在的误差。 : 图像处理; 左心室定量分析; 数字减影 : R 319. 55 : A A Lef t Ventricular Model Based on Elliptic Slice Analysis J i Zhen1) J iang Yif e ng 2) Zhang J ihong 1) ( 1) Colleg e of I nfo rm at o n Eng neer ng , Shenzhen U n v ers tyShenzhen 5 18060, P . R . Ch na) ( 2) , 710049 , . . ) I nst tute of I mage P ro cess ng X an J aoto ng U n v ers ty X an P R Ch na Abstract A novel lef t vent r cular ( L V ) model based on a sl ce-w se project o n t echn que s pro posed . Every sl ce of L V s repr esent ed w th an ell p se, so t he w ho le l ef t vent r cular s equ valent t o a set of t h ck ell pt cal sl ces. T he project al - . mages of L V can be acqu red by rot at ng t he C arm w th cert a n ang les T he best param et ers of each sl ce are calculat ed w t h a com put at onal m et hod . T her ef ore, t he volume of L V s det er m ned . T h s model m pro ves the accuracy of L V vol ume est mat o n t heoret cally and ex per mentall y and per for ms bet t er than t he prev ou s ell pso dal m odel. T he erro rs cau sed by t he mo del are d scussed n deta l. Key words: mag e process ng; l ef t