Short-Axis Propeller (SAP) EPI enables short echo spacing, thereby minimizing geometric distortion, while providing low resolution in the readout direction of single blades. These multiple low-resolution blades can be combined to create a final high-resolution image. However, off-resonance effect often results in blurring after blade combination. In this work, we extend a model-based framework for reconstructing SAP-EPI to minimize off-resonance induced blurring artifacts. Moreover, locally low rank (LLR) regularization is incorporated to estimate per-blade phase calibrations. As a result, the proposed technique enables high-resolution SAP-EPI images with minimizing blurring artifact and no need for phase calibration of different multi-blade directions.
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