A Dynamic Shim Approach for Correcting Eddy Current Effects in Diffusion-Prepared MRI Acquisition Using a Multi-Coil AC/DC Shim-Array.

PURPOSE We developed a dynamic B0 shimming approach using a 46-channel AC/DC shim array to correct phase errors caused by eddy currents from diffusion-encoding gradients in diffusion-prepared MRI, enabling high b value imaging without the SNR loss from the use of a magnitude stabilizer. METHODS A 46-channel AC/DC shim array and corresponding amplifier system were built. Spin echo prescans with and without diffusion preparation were then used to rapidly measure eddy current-induced phase differences. These phase maps were used as targets in an optimization framework to compute compensatory shim currents for multi-shot 3D diffusion-prepared acquisitions. RESULTS The proposed method allows flexible use of the AC/DC shim array to correct undesirable eddy current effects in diffusion-prepared MRI. Phantom and in vivo experiments demonstrate whole-brain, cardiac-gated, multi-shot 3D diffusion-prepared imaging without the use of magnitude stabilizers. The approach enables preservation of full SNR while achieving reliable diffusion encoding at b values up to 2000 s/mm2. CONCLUSIONS This work demonstrates a new strategy for applying an AC/DC shim array to compensate for eddy current-induced phase errors in diffusion-prepared MRI. By eliminating the need for a magnitude stabilizer, it enables efficient high-quality diffusion imaging with full signal sensitivity retained.

• Publication year

  2025

• Venue

  Magnetic Resonance in Medicine

• Publication date

  2025-11-09

• Fields of study

  Medicine, Physics, Engineering

• Identifiers
  DOI 10.1002/mrm.70294arXiv 2511.06178PMID 41668342
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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