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Abstract #5130

Rigid and multirigid motion-mitigated MRI with self-gated Cartesian acquisition

Zijian Zhou1, Wenchao Yang2, Wenjian Liu1, Haikun Qi1, and Peng Hu1
1ShanghaiTech University, Shanghai, China, 2United Imaging, Shanghai, China

Synopsis

Keywords: Motion Correction, Acquisition Methods

Motivation: Rigid or multirigid motion remains a challenge for brain or musculoskeletal imaging. The unintentional motions can degrade the MR image quality and affect diagnosis.

Goal(s): To apply a self-gated Cartesian acquisition for rigid or multirigid motion-mitigated MRI of the brain and knee.

Approach: A previously developed spoiled gradient echo sequence with self-gated rotating Cartesian k-space acquisition (ROCK) was applied. Motion information can be extracted from the self-gating projections, which can be used for motion-mitigated reconstruction.

Results: The self-gating projections can detect the motion in all three directions with high sensitivity. Quality of the reconstructed image using self-gating is significantly improved.

Impact: The self-gating technique can detect rigid or multirigid motions with high sensitivity. It is also robust for different readout directions. With a minimal acquisition time overhead, this technique enables motion-mitigated reconstruction and the image quality is significantly improved.

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Keywords