FISTA 压缩感知的图像使用快速迭代shrinkage-thresholding算法(小波sparsifying转换 傅氏域抽样磁共振成像和氡转换断层测量)- FISTA compression perception of image using fast iterative shrinkage- thresholding algorithm (magnetic resonance imaging (fmri) wavelet sparsifying transform fourier-