多尺度特征融合网络的磁共振快速重建方法

A Fast MRI Reconstruction Method Based on Multi-scale Feature Fusion Network

  • 摘要: 为了提高磁共振的数据采集效率,提出了一种多尺度特征融合网络。该网络模型由二扩张卷积和三扩张卷积特征融合块组成,采用扩张卷积以较少的参数扩大网络的感受野。在特征融合块中将几个扩张卷积残差模块组合在一起,并通过跳跃连接直接传输每个局部残差分支模块上的特征。使用特征融合块融合局部残差特征来产生更丰富的特征表示,同时引入局部残差学习来提取更多的图片细节。通过多组不同加速倍率下的重建实验并与其他文献中提到的方法相比较,实验结果表明,该网络重建出的磁共振图像具有更高的峰值信噪比和结构相似性。

     

    Abstract: In order to accelerate the acquisition of Magnetic Resonance Imaging (MRI), a multi-scale feature fusion network is proposed. The network consists of two feature fusion blocks (FFB) based on dilated convolution with different dilation scale, the dilated convolution is employed for expanding the receptive field with less network parameters. Furthermore, the FFB groups several dilated convolution modules together and directly propagates the features on each local module branch through skip connections. The feature fusion blocks are used to fuse local residual features and further to produce more representative features, at the same time, the local residual learning is introduced to extract more details. Compared with other algorithms, the comprehensive experiments on different acceleration rates show that the proposed network can reconstruct high quality MR image with higher peak signal noise ratio (PSNR) and structural similarity index (SSIM).

     

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