Comparison Between Parzen Window Interpolation and Generalised Partial Volume Estimation for Nonrigid Image Registration Using Mutual Information
Comparison Between Parzen Window Interpolation and Generalised Partial Volume Estimation for Nonrigid Image Registration Using Mutual Information
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使用互信息的非刚性图像配准的 Parzen 窗插值与广义部分体积估计之间的比较
DOI：
10.1007/11784012_25
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
P. Suetens
中科院分区：
文献类型：
--
作者：
D. Loeckx;F. Maes;D. Vandermeulen;P. Suetens
由于其对各种应用（无论是单模态还是多模态）的鲁棒性和准确性，互信息 (MI) 是一种非常流行的（医学）图像配准相似性度量。 MI的计算基于待配准的两幅图像的联合直方图，表达对应位置的图像强度之间的统计关系。然而，联合直方图的计算并不简单。数字图像的离散性质（在强度域和空间域中采样）阻碍了联合直方图的精确计算。此外，在配准过程中，通常会在浮动图像的非网格位置寻找强度。本文比较了非刚性多分辨率医学图像配准背景下两种常见直方图估计器的鲁棒性和准确性：Parzen 窗强度插值器 (IIP) 和广义部分体积直方图估计 (GPV)。从 BrainWeb 数据和从患者图像获得的真实变形场出发，实验表明 GPV 更稳健，而 IIP 更准确。使用组合方法，模内配准的平均配准误差为 0.12 毫米，联运配准的平均配准误差为 0.30 毫米。
Because of its robustness and accuracy for a variety of applications, either monomodal or multimodal, mutual information (MI) is a very popular similarity measure for (medical) image registration. Calculation of MI is based on the joint histogram of the two images to be registered, expressing the statistical relationship between image intensities at corresponding positions. However, the calculation of the joint histogram is not straightforward. The discrete nature of digital images, sampled as well in the intensity as in the spatial domain, impedes the exact calculation of the joint histogram. Moreover, during registration often an intensity will be sought at a non grid position of the floating image.This article compares the robustness and accuracy of two common histogram estimators in the context of nonrigid multiresolution medical image registration: a Parzen window intensity interpolator (IIP) and generalised partial volume histogram estimation (GPV). Starting from the BrainWeb data and realistic deformation fields obtained from patient images, the experiments show that GPV is more robust, while IIP is more accurate. Using a combined approach, an average registration error of 0.12 mm for intramodal and 0.30 mm for intermodal registration is achieved.