Chinese Journal of Magnetic Resonance ›› 2024, Vol. 41 ›› Issue (3): 341-361.doi: 10.11938/cjmr20243087
• Review Article • Previous Articles
Received:
2023-10-19
Published:
2024-09-05
Online:
2024-08-23
Contact:
*Tel: 13761603606, E-mail: yjusst@126.com.
CLC Number:
YANG Liming, WANG Yuanjun. Research Progress of Denoising Algorithms for Diffusion Tensor Images[J]. Chinese Journal of Magnetic Resonance, 2024, 41(3): 341-361.
Table 1
Details of popular public datasets
数据集 | 成像区域 | 描述 | 网站 |
---|---|---|---|
IXI | 脑 | 600张健康受试者的MRI图像,包括T1图像、T2图像、DWI图像等. | https://brain-development.org/ixidataset/ |
HCP | 脑 | 1200名健康受试者的多模态脑MRI图像,包括DWI图像、DTI图像等. | https://humanconnectome.org/ |
OASIS | 脑 | 正常衰老和阿尔茨海默症的MRI图像,包括T1加权图像、T2加权图像、DTI图像等. | http://www.oasis-brains.org/ |
ADNI | 脑 | 用于阿尔茨海默病的早期检测和跟踪的影像数据,包括DTI图像、功能MRI图像、结构MRI图像等. | https://adni.loni.usc.edu/ |
MASSIVE | 脑 | 8000个三维DWI数据,包括b值为0图像、DWI扫描的噪声图像,及10个三维T1图像、T2加权图像等. | https://www.massive-data.org/ |
fastMRI | 前列腺 | 312次检查的T2加权图像、DWI图像. | https://fastmri.med.nyu.edu/ |
Table 2
Comparison of DTI denoising algorithms based on traditional image processing
方法 | 第一作者 | 优点 | 缺点 |
---|---|---|---|
NLM | Kafali[ | 利用多次采集的共享结构,对凸集投影算法在各次采集中聚合的复值输出进行处理;能够有效校正相位误差并保留DWI图像细节. | 去噪性能受到块组尺寸的限制. |
Liu[ | 使用张量流形来度量扩散张量的相似度,并直接正则化DTI图像;在不模糊图像边界的同时,保留了张量的几何特征,并提高了FA图和纤维束追踪的精度. | 处理时间较长;无法去除原始DWI数据产生的背景噪声. | |
Chen[ | 在x-q空间对DWI数据去噪;在不模糊图像边缘的同时,准确去除了复杂结构(如高度弯曲的白质结构)中的噪声. | 处理时间较长. | |
Chen[ | 基于图框架变换,充分利用DWI数据的冗余,保留图像的边缘. | 需要较大的计算机内存. | |
PCA | Manjón[ | 利用多扩散方向dMRI数据中的冗余,对局部块组奇异值进行阈值化,避免相似块组的搜索过程,减少了处理时间. | PCA阈值的选取存在主观性. |
Chen[ | 在两个独立的通道中,分别沿扩散维度,对具有扩散匹配特性相位校正后的DWI数据的实分量和虚分量进行去噪. | 处理时间较长. | |
Veraart[ | 基于Marchenko-Pastur定律对空间变化的莱斯噪声进行估计,并提出客观的PCA阈值选取方法;利用多扩散方向dMRI数据的冗余. | 去噪性能严重依赖数据冗余量;存在噪声假设. | |
Llordén[ | 在不需要满足Marchenko-Pastur定律假设的同时,充分利用了数据的线性和非线性冗余. | 去噪性能依赖核函数. | |
Olesen[ | 修改Marchenko-Pastur分布,拓宽MPPCA的适用性;利用多维数据固有张量结构的每个维度来表征噪声,并递归估计信号成分,更好地利用多维数据中的冗余. | 去噪性能受到块组尺寸的限制;存在噪声假设, 即每个块组中的噪声是独立同分布的. | |
LRMA | Ma[ | 联合VST和OSVS,对幅值dMRI数据去噪;在有效去除噪声和提高SNR的同时,提高了DTI图及交叉纤维估计的精度. | 基于VST的噪声估计会高估噪声标准差. |
Zhang[ | 通过全局HOSVD预去噪,在一定程度上减少了基于块匹配HOSVD阶段噪声退化对HOSVD基的影响. | 去噪性能依赖VST算法;当图像SNR较低时,会引入伪影. | |
Xu[ | 联合基于HOSVD稀疏约束和莱斯噪声校正模型,直接对每个局部图像块进行去噪,无需VST技术,从原理上解决了伪影问题. | 去噪性能依赖参数设置. | |
Zhao[ | 有效利用不同扩散方向DWI数据的冗余,尤其适用于较少扩散方向或较低b值的DWI数据. | 去噪性能受到块组尺寸的限制. | |
全变分最 小化 | Knoll[ | 通过对扩散张量元素施加全变分约束,直接在目标定量域中进行压缩感知;在加快采集速度的同时,显著减少了参数图中的噪声. | 仅在有限的数据上进行评估. |
贝叶斯 | Krajsek[ | 基于贝叶斯框架对DTI图像进行重建和正则化;在保证张量正定性的同时,考虑了DTI的黎曼几何性质和莱斯噪声的统计特征. | 处理时间较长. |
Liu[ | 采用黎曼相似性度量和高斯混合模型学习块组的先验分布;利用贝叶斯推理自适应去噪的同时,保留了DTI图像的非线性结构. | 块匹配过程耗时,且高度依赖图像的先验知识. | |
稀疏字典 | Kong[ | 利用三维DTI数据相邻切片间的冗余来训练自适应稀疏字典. | 处理时间较长. |
St-Jean[ | 采用角度邻近匹配以提高稀疏性;通过字典学习进行局部去噪. | 处理时间较长. |
Table 3
Comparison of DTI denoising models based on deep learning
方法 | 第一作者 | 模型 | 优点 | 缺点 |
---|---|---|---|---|
监督 | Cheng[ | 1D CNN | 采用SOS-SENSE数据对训练;采用时域去噪,在有效减少训练数据量的同时,更能保留每个体素时间序列的一致性. | 两种重建方式获得的数据的噪声类型不同,影响去噪性能. |
Jurek[ | SRCNN | 采用迁移学习方式训练模型;对复值DWI数据去噪,在一定程度上减少了莱斯偏置的影响. | 容易造成边缘模糊. | |
Muckley[ | U-Net | 对复值DWI数据去噪,显著去除了DTI参数图中的伪影;采用ImageNet数据集训练模型,能够抑制模型的过拟合. | 仅对单幅DWI图像去噪,忽略了图像间的相关性. | |
Wang[ | U-Net | 使用共享连接路径隐式地从多b值DWI数据中提取特征,充分利用图像间的结构相关性. | 容易造成过度去噪. | |
Tian[ | 3D CNN | 充分利用了DWI数据的局部和非局部空间信息及扩散编码方向和图像对比度中的冗余;将MRI图像作为训练集的输入,以防止去噪图像模糊. | 传统张量拟合方法对噪声较为敏感,去噪效果受到限制. | |
Li[ | U-Net | 直接预测高质量DTI参数图,避免了传统张量拟合方法. | 仅预测单个类型DTI参数图. | |
无监督 | Lin[ | CNN | 基于DIP模型对多b值DWI图像同时去噪. | 采用的数据集类型较为单一. |
Jurek[ | SRCNN | 通过N2N范式训练去噪网络,性能优于幅度图像平均法. | 去噪图像存在部分背景噪声. | |
Fadnavis[ | / | 利用多扩散方向DWI数据的冗余,特别适用于较少扩散方向数据;逐体素方式去噪. | 去噪性能依赖噪声假设. | |
自监督 | Tian[ | U-Net | 采用“先去噪后平均”的方法,保证输入图像具有更高的SNR;在有效去除噪声的同时,保留了图像的结构信息. | 去噪性能依赖扩散方向数量. |
Yuan[ | CNN | 采用SSIM匹配算法搜索含噪图像对;引入一种新的边缘加权损失函数,更好地保留纹理细节. | SSIM指标易受原始图像中噪声的影响. | |
Xiang[ | / | 联合自监督统计去噪理论和扩散模型;逐切片方式去噪. | 处理时间较长. |
Fig. 8
Visual comparison of the denoised images, fitted FA maps, color-coded FA maps, noise-free images, and noise images of the GL-HOSVD and VST-OSVS algorithms using the simulated DWI data with 4% noise level and b-value of 1 000 s/mm2. The numbers reported are RMSE values, and the b-values are in s/mm2
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