The acquisition of Magnetic Resonance Imaging (MRI) is inherently slow. Inspired by recent advances in deep learning, we propose a framework for reconstructing MR images from undersampled data using a deep cascade of convolutional neural networks to accelerate the data acquisition process. We show that for Cartesian undersampling of 2D cardiac MR images, the proposed method outperforms the state-of-the-art compressed sensing approaches, such as dictionary learning-based MRI (DLMRI) reconstruction, in terms of reconstruction error, perceptual quality and reconstruction speed for both 3-fold and 6-fold undersampling. Compared to DLMRI, the error produced by the method proposed is approximately twice as small, allowing to preserve anatomical structures more faithfully. Using our method, each image can be reconstructed in 23 ms, which is fast enough to enable real-time applications.

通过卷积神经网络的深度级联，在MRI数据的欠采样下，提出了一种加速数据采集过程的图像重建框架，与现有的压缩感知方案相比，重建出来的图像具有更小的错误、更好的感知质量和更快的速度。该方法在保留解剖结构的同时，每张图片的重建速度能够达到23毫秒，足以实现实时应用。

深层级卷积神经网络级联重建MR图像