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Abstract #1181

Model-Based Iterative Reconstruction for Short-Axis Propeller EPI at 7T MRI

Uten Yarach1,2, Frank Godenschweger3, Matt A Bernstein2, Myung-Ho In2, Itthi Chatnuntawech44, Kawin Setsompop5, Oliver Speck3, and Joshua Trzasko2
1Radiologic Technology Department, Associated Medical Sciences, Chiang Mai University, Chinag Mai, Thailand, 2Department of Radiology, Mayo Clinic, Rochester, MN, USA, Rochester, MN, United States, 3Otto-von-Guericke University Magdeburg, Biomedical Magnetic Resonance, Magdeburg, Germany, 4National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Bangkok, Thailand, 5Department of Radiology, Stanford University, Stanford, CA, United States

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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