改进Demons算法的非刚性医学图像配准

张红颖; 张加万; 孙济洲

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改进Demons算法的非刚性医学图像配准

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- 改进Demons算法的非刚性医学图像配准
- Non-rigid medical image registration based on improved Demons algorithm
- 光学精密工程 2007年15卷第1期页码：145-150
- 作者机构：
  
  天津大学计算机科学与技术学院天津,300072
- 作者简介：
- 基金信息：
- DOI：
  中图分类号： TP391
- 收稿日期：2006-07-13，
  
  修回日期：2006-09-15，
  
  网络出版日期：2007-01-30，
  
  纸质出版日期：2007-01-30
- 稿件说明：
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张红颖, 张加万, 孙济洲. 改进Demons算法的非刚性医学图像配准[J]. 光学精密工程, 2007,15(1):145-150.

ZHANG Hong-ying, ZHANG Jia-wan, SUN Ji-zhou. Non-rigid medical image registration based on improved Demons algorithm[J]. Optics and precision engineering, 2007, 15(1): 145-150.
张红颖, 张加万, 孙济洲. 改进Demons算法的非刚性医学图像配准[J]. 光学精密工程, 2007,15(1):145-150. DOI：

ZHANG Hong-ying, ZHANG Jia-wan, SUN Ji-zhou. Non-rigid medical image registration based on improved Demons algorithm[J]. Optics and precision engineering, 2007, 15(1): 145-150. DOI：

摘要

非刚性配准是医学图像处理的一个重要的研究方向。基于光流场模型的Demons算法由于仅依赖图像灰度梯度使图像变形

当缺乏梯度信息时图像的变形方向不能确定

因而容易造成误配准

且该算法只适合于单模态图像配准。本文针对最大互信息配准方法在多模态刚性配准中的成功应用

提出了一种可用于多模态图像配准的改进Demons算法。该方法在原有驱动图像变形力的基础上

增加两幅图像间互信息对当前变换的梯度作为附加力作用

使浮动图像向两图像间互信息增大的方向变形

正确地配准图像。为避免陷入局部极值并提高算法的运行速度

该方法在多分辨率策略下实现。使用单模态、多模态图像分别进行实验来验证此算法

并与原始Demons算法进行比较

实验表明

该方法能够快速地产生准确的配准变换。

Abstract

Non-rigid registration is one of the important research issues in medical image processing field. An intensity-based automatic deformable image registration algorithm

known as the "Demons" algorithm

only depends on the image intensity gradients of the reference image to drive the floating image transform

it easily results in wrong registration when gradients are small

even being zeros. Moreover

this algorithm is not fit for the registration of multi-modality images. So

an improved "Demons" algorithm is proposed in this paper. The method adds additional external force based on the fact that the two images can make the mutual information between them maximal

and the force is defined as the gradient of mutual information between the two images with respect to the deformation field. Moreover

to avoid local extrema and speed up the registration process

the algorithm is performed in a multi-resolution manner. Experiments are conducted with both mono-modality and multi-modality images

the results show that this improved method can get a accurate registration transformation quickly.

关键词

Keywords

references

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