一种基于椭圆形断层图象分析的左心室模型.pdfVIP

一种基于椭圆形断层图象分析的左心室模型一种基于椭圆形断层图象分析的左心室模型* 一种基于椭圆形断层图象分析的左心室模型一种基于椭圆形断层图象分析的左心室模型 纪震 1) 蒋一峰 2) 张基宏 1) (1) 深圳大学信息工程学院 深圳 518060) (2) 西安交通大学图象所 西安 710049) 摘摘 要要 本文建立了一个新的基于椭圆断层图象的左心室模型，该模型将左心室的断层面采用 摘摘 要要 椭圆来描述，整个左心室就等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。 关键词：图象处理、左心室定量分析、数字减影关键词 关键词关键词 中图分类号：中图分类号：R319.55 中图分类号：中图分类号： A Left Ventricular Model Based on Elliptic Slices Analysis Ji Zhen1) Jiang Yifeng2) Zhang Jihong1) (1)College of Information Engineering, Shenzhen University, Shenzhen,518060) (2) Image Processing Center, Xi’an Jiaotong University, Xi’an, 710049) Abstract A novel left ventricular (LV) model based on a slice-wise projection technique is proposed. Every slices of LV are represented with ellipse, so the whole left ventricular is equivalent to a set of thick elliptical slices. The project images of LV can be acquired by rotating the C-arm with certain angles.. Every slice’s best parameters are calculated with computational method., Therefore, the volume of LV is determined. This model improves the accuracy of LV volume estimation theoretically and experimentally and performs better than previous ellipsoidal model. The errors caused by this model are discussed in details. Key words: Image Processing, Left Ventricular Quantitative Analysis, Digital Subtraction Angiography 4 L M N π V = π = LMN 引言引言 3 2 2 2 6 (1) 引言引言 正确评价心脏的功能，在临床医学中显得非常