汪晓妍，郑焕彰，黄晓洁，李军伟，张剑华，管　秋，陈胜勇

(1.浙江工业大学 计算机科学与技术学院，浙江 杭州 310023；2.浙江大学 医学院附属第二医院 滨江院区，浙江 杭州 310009；

3.浙江工业大学 信息工程学院，浙江 杭州 310023)

上下文窄带约束下腹主动脉瘤外轮廓分割

汪晓妍1，郑焕彰1，黄晓洁2，李军伟3，张剑华1，管秋1，陈胜勇1

(1.浙江工业大学 计算机科学与技术学院，浙江 杭州 310023；2.浙江大学 医学院附属第二医院 滨江院区，浙江 杭州 310009；

3.浙江工业大学 信息工程学院，浙江 杭州 310023)

摘要：针对腹主动脉瘤(Abdominal aortic aneurysm，AAA)外轮廓在医学图像中显著性较低，现有算法难以实现精确自动分割的问题，提出一种新型的基于上下文窄带约束的计算机断层扫描血管造影(Computed tomography angiography，CTA)图像序列连续分割算法.首先采用改进的局部二元拟合(Local binary fitting，LBF)水平集方法获取初步腹主动脉瘤外轮廓，然后利用上下文窄带约束实现外轮廓高精度分割.单层的分割结果作为相邻层分割先验实现迭代分割.相关实验表明：提出的算法性能优于传统方法，可以实现图像序列中腹主动脉瘤外轮廓的高精度自动分割.

关键词：上下文信息；窄带约束；水平集方法；局部二元拟合

Automatic abdominal aortic aneurysm outer contour segmentation based

on context information and narrow band constraint

WANG Xiaoyan1, ZHENG Huanzhang1, HUANG Xiaojie2, LI Junwei3,

ZHANG Jianhua1, GUAN Qiu1, CHEN Shengyong1

(1.College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou 310023, China；

2.The Second Affiliated Hospital Zhejiang University School of Medicine, Binjiang Branch, Hangzhou 310009, China；

3.College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China)

Abstract:The outer contour of abdominal aortic aneurysm (AAA) is fuzzy, which make it difficult for recent method getting its accurate segmentation. A novel context information and narrow band constraint based segmentation method for computed tomography angiography (CTA) sequence is provided. Firstly, improved LBF based level set method is used to get the preliminary outer contour of AAA. Then the context information and the narrow band constraint are used to get more accurate outer contour in current slice which would be used as prior of adjacent slice in iterative segmentation. The experimental result on the dataset shows the method proposed in this paper can get better segmentation result than existing method. So this method can get the outer contour of AAA with high accuracy.

Key words:context information; narrow band constraint; level set method; local binary fitting

腹主动脉瘤(Abdominal aortic aneurysm，AAA)是一种中老年人常发的疾病，主要的风险在于其不断扩张导致破裂而危及患者生命[1].获得计算机断层扫描血管造影(Computed tomography angiography，CTA)图像序列上腹主动脉瘤内外轮廓是对瘤体进行精确测量和研究的前提，也为临床诊断提供可靠的依据.随着计算机图像处理技术的发展……