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Figure 2 | Journal of Cardiovascular Magnetic Resonance

Figure 2

From: L1 k-t ESPIRiT: Accelerating Dynamic MRI Using Efficient Auto-Calibrated Parallel Imaging and Compressed Sensing Reconstruction

Figure 2

a) Fully sampled reference x-t image series (top) and G operator x-f eigenvalue images (bottom) derived from the corresponding 5-fold undersampled data set. The eigenvalue maps reveal the x-f support of the object, and thus, can be incorporated before S x,f matrix (composed of corresponding eigenvectors) multiplication as an additional diagonal weighting matrix multiplication to suppress unwanted temporal frequencies. b) Systolic (top) and diastolic (bottom) frames of reference data and IFT, k-t SPIRiT and k-t ESPIRiT reconstructions from 5-fold undersampled k-t data. The sampling pattern in the temporal phase encode plane is depicted on the left. Reconstruction times relative to k-t SPIRiT are also shown, i.e. k-t ESPIRiT was approximately three-times faster. Arrows mark suppressed image artifacts present in the systolic reference and k-t SPIRiT image.

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