论文标题
基于单通道深度学习
Non-iterative Coarse-to-fine Registration based on Single-pass Deep Cumulative Learning
论文作者
论文摘要
可变形的图像注册是医学图像分析的关键步骤,用于在一对固定图像和移动图像之间找到非线性空间变换。基于卷积神经网络(CNN)的深度注册方法已被广泛使用,因为它们可以快速,端到端的方式执行图像注册。但是,对于具有较大变形的图像对,这些方法的性能通常有限。最近,迭代深度注册方法已被用来减轻这种局限性,在这种限制中,转换是用粗到精细的方式迭代学习的。但是,迭代方法不可避免地会延长注册运行时,并倾向于为每次迭代学习单独的图像特征,从而阻碍特征被利用,以便在以后的迭代时促进注册。在这项研究中,我们提出了一个非详细的粗到精细注册网络(NICE-NET),用于可变形图像登记。在Nice-Net中,我们提出:(i)单个深层累积学习(SDCL)解码器,可以在网络的单个通过(迭代)中累积地学习粗到最新的变换,以及(ii)选择性地促进的功能学习(SFL)编码器,可以学习整个较粗糙的介绍特征的共同图像特征,以实现整个粗到3的注册过程,并选择性地进行了propagation and Propagate和Propagate and Propagate和Propagate and Propagate and Propagate and Propagate and Propagate and Propagate and Propagate and Propagate and Propagate。在3D脑磁共振成像(MRI)的六个公共数据集上进行了广泛的实验表明,我们提出的Nice-NET可以超越最新的迭代深度注册方法,而仅需要与非辅助方法类似的运行时。
Deformable image registration is a crucial step in medical image analysis for finding a non-linear spatial transformation between a pair of fixed and moving images. Deep registration methods based on Convolutional Neural Networks (CNNs) have been widely used as they can perform image registration in a fast and end-to-end manner. However, these methods usually have limited performance for image pairs with large deformations. Recently, iterative deep registration methods have been used to alleviate this limitation, where the transformations are iteratively learned in a coarse-to-fine manner. However, iterative methods inevitably prolong the registration runtime, and tend to learn separate image features for each iteration, which hinders the features from being leveraged to facilitate the registration at later iterations. In this study, we propose a Non-Iterative Coarse-to-finE registration Network (NICE-Net) for deformable image registration. In the NICE-Net, we propose: (i) a Single-pass Deep Cumulative Learning (SDCL) decoder that can cumulatively learn coarse-to-fine transformations within a single pass (iteration) of the network, and (ii) a Selectively-propagated Feature Learning (SFL) encoder that can learn common image features for the whole coarse-to-fine registration process and selectively propagate the features as needed. Extensive experiments on six public datasets of 3D brain Magnetic Resonance Imaging (MRI) show that our proposed NICE-Net can outperform state-of-the-art iterative deep registration methods while only requiring similar runtime to non-iterative methods.