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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: J Magn Reson Imaging. 2012 Jul 12;37(1):243–248. doi: 10.1002/jmri.23750

Figure 1.

Figure 1

Approximate Message Passing (AMP), a variant of iterative soft thresholding, is used in the CS reconstruction. The 2D Fourier transform (in y𒀓z) and Daubechies 4 wavelet transform were used. The soft-thresholding step is data-driven and based on the undersampling factor and signal level in the highest wavelet sub-band. The AMP term (previous iteration’s residual multiplied by AMP weight) enables fast computation. The stopping criterion is met when the normalized difference of the L2-norm of successive residuals is less than 0.1%.