arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.01385eess.IVcs.CV
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用于快速磁共振成像中k空间数据插值的自适应卷积神经网络

Adaptive convolutional neural networks for k-space data interpolation in fast magnetic resonance imaging

School of Information and Communication Engineering, Beijing University of Posts and Telecommunications(北京邮电大学信息与通信工程学院);Perelman School of Medicine, University of Pennsylvania(宾夕法尼亚大学佩雷尔曼医学院)

Tianming Du, Honggang Zhang, Yuemeng Li, Hee Kwon Song, Yong Fan

摘要:

在快速磁共振成像(MRI)中,k空间中的深度学习已经证明了从欠采样的k空间数据重建图像重建的巨大潜力。然而,现有的基于深度学习的图像重建方法通常将权重共享卷积神经网络(CNN)应用于k空间数据,而不考虑k空间数据的空间频率属性,导致图像重建模型的无效学习。此外,在现有的深度学习方法中,空间相邻切片的互补信息往往被忽略。为了克服这些限制,我们开发了一种深度学习算法,称为用于k空间数据插值的自适应卷积神经网络(ACNN-k-Space),该算法采用残差编码器-解码器网络架构,通过将空间连续切片作为多通道输入,以及来自多个线圈的k空间数据(如果可用)来插值欠采样的k空间数据。该网络通过自关注层来增强,以自适应地关注不同空间频率和信道的k空间数据。我们在两个公共数据集上评估了我们的方法,并将其与最先进的现有方法进行了比较。消融研究和实验结果表明,我们的方法有效地重建图像欠采样的k空间数据,并实现显着更好的图像重建性能比目前最先进的技术。

英文摘要:

Deep learning in k-space has demonstrated great potential for image reconstruction from undersampled k-space data in fast magnetic resonance imaging (MRI). However, existing deep learning-based image reconstruction methods typically apply weight-sharing convolutional neural networks (CNNs) to k-space data without taking into consideration the k-space data's spatial frequency properties, leading to ineffective learning of the image reconstruction models. Moreover, complementary information of spatially adjacent slices is often ignored in existing deep learning methods. To overcome such limitations, we develop a deep learning algorithm, referred to as adaptive convolutional neural networks for k-space data interpolation (ACNN-k-Space), which adopts a residual Encoder-Decoder network architecture to interpolate the undersampled k-space data by integrating spatially contiguous slices as multi-channel input, along with k-space data from multiple coils if available. The network is enhanced by self-attention layers to adaptively focus on k-space data at different spatial frequencies and channels. We have evaluated our method on two public datasets and compared it with state-of-the-art existing methods. Ablation studies and experimental results demonstrate that our method effectively reconstructs images from undersampled k-space data and achieves significantly better image reconstruction performance than current state-of-the-art techniques.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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