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  • 1King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom.

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Summary

This study introduces a new nonrigid motion corrected reconstruction for faster, free-breathing 3D abdominal MRI. The method achieves similar image quality to standard scans but significantly reduces acquisition time without external sensors.

Keywords:
abdominal MRImotion correctionnonrigid motiontotal variationundersampling

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)
  • Image Reconstruction

Background:

  • Free-breathing abdominal MRI is challenging due to respiratory motion.
  • Traditional motion correction often requires external sensors or additional scans, increasing acquisition time.
  • Accelerated imaging techniques are crucial for improving patient comfort and throughput.

Purpose of the Study:

  • To develop a nonrigid motion corrected reconstruction for highly accelerated free-breathing 3D abdominal MRI.
  • To eliminate the need for external sensors or additional scans for motion correction.
  • To achieve high-quality abdominal images with significantly reduced scan times.

Main Methods:

  • A self-gated 3D golden radial phase encoding trajectory was used for accelerated data acquisition.
  • A two-stage reconstruction process was employed: first, iterative SENSE for motion-resolved images, then nonrigid registration to estimate motion.
  • Motion fields were incorporated into a general matrix reconstruction with total variation regularization for final image generation.

Main Results:

  • The proposed method demonstrated comparable image quality to standard gated reconstructions, with no significant differences in liver sharpness or gradient entropy.
  • Visual assessments by experts showed similar scores for image sharpness and overall quality between the proposed and standard methods.
  • The average acquisition time was reduced from 102 seconds to 39 seconds, a significant acceleration.

Conclusions:

  • The developed nonrigid motion corrected reconstruction is feasible for in vivo abdominal MRI.
  • It achieves diagnostic image quality comparable to gated scans.
  • The method offers substantial reductions in acquisition time, enhancing efficiency in free-breathing 3D abdominal imaging.