| DTI扩散张量的一种稳健估计方法 |
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| 引用本文： | 白衡,高玉蕊,王世杰,罗立民.DTI扩散张量的一种稳健估计方法[J].计算机研究与发展,2008,45(7). |
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| 作者姓名： | 白衡 高玉蕊 王世杰 罗立民 |
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| 作者单位： | 东南大学影像科学与技术实验室,南京,210096 |
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| 摘 要： | 为了获得更精确的DTI扩散张量场,提出了一种基于约束M估计子的稳健估计方法,首先对扩散加权图像序列进行双树复数小波降噪预处理,以减少热噪声影响,然后通过试探法找到一个合适的回归起始点,并通过Cholesky分解对扩散张量进行正定约束,最后寻找局部最小获得DTI扩散张量的约束M估计,并在模拟二阶张量场和真实DTI数据集上进行了实验.与最小二乘法和M估计子回归模型相比,该方法可以更有效地排除热噪声和生理性离群点影响,对DTI扩散张量估计很有价值.
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| 关 键 词： | 扩散加权成像 扩散张量成像 张量估计 约束M估计子 生理性噪声 |
A Robust Diffusion Tensor Estimation Method for DTI |
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| Bai Heng,Gao Yurui,Wang Shijie,Luo Limin.A Robust Diffusion Tensor Estimation Method for DTI[J].Journal of Computer Research and Development,2008,45(7). |
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| Authors: | Bai Heng Gao Yurui Wang Shijie Luo Limin |
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| Affiliation: | Bai Heng,Gao Yurui,Wang Shijie,, Luo Limin(Laboratory of Image Science , Technology,Southeast University,Nanjing 210096) |
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| Abstract: | In diffusion tensor imaging(DTI),diffusion tensor maps are typically calculated from a sequence of diffusion weighted images.However,the diffusion weighted imaging is often influenced by both thermal noise and physiological noise such as artifacts caused by physiological motions.A robust estimation method based on the constrained M-estimator with high breakdown point and high asymptotic efficiency is proposed in this paper for acquiring more accurate DTI diffusion tensor field.First,during preprocessing pha... |
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| Keywords: | DWI DTI tensor estimation constrained M-estimator physiologic noise |
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