基于双树复小波变换的磁共振幅值相位同时重建

Simultaneous Reconstruction of Magnetic Resonance Magnitude and Phase Based on Dual Tree Wavelet Transform

  • 摘要: 为了加快磁共振成像速度及同时获取可信度较高的磁共振幅值和相位信息,提出了一种基于双树复小波变换的磁共振幅值和相位同时重建算法。该算法在传统的压缩感知框架下,借助双树复小波变换的多方向选择性和平移不变性,对幅值和相位分别进行稀疏变换。实验结果表明,在不同的数据集下,该算法均能提高重建磁共振相位图像的质量,并一定程度地改善了幅值图像。

     

    Abstract: In order to speed up the Magnetic Resonance Imaging(MRI) and to obtain the magnitude and phase information with high reliability, an algorithm for simultaneous reconstructing magnitude and phase images of MRI is proposed based on dual tree complex wavelet transform. Under the compressed sensing framework, the proposed algorithm employs the dual tree complex wavelet transform as the sparse representation for magnitude and phase parts, and therefore benefits from the multi-directional selectivity and shift invariance of the dual tree complex wavelet transform. Experimental results show that, for different datasets, the algorithm can improve the quality of the reconstructed phase and magnitude images to some extent.

     

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