Single-shot quantitative methods with spiral sampling can increase the readout duration to reduce undersampling artifacts in the images and their propagation to the parameter maps. However, a longer readout increases blurring due to the off-resonance field if not accounted for in the reconstruction. We propose an efficient reconstruction that 1. corrects for blurring due to the off-resonance field, and 2. reduces undersampling artifacts by constraining the signal variation in each voxel to a predetermined subspace. The reconstruction method is shown to enable accurate multi-parametric mapping of a single-shot MP-b-nSSFP acquisition with submillimeter resolution in 1.8s.
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