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Related Concept Videos

Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Author Spotlight: Optimized Lung MRI Protocol with Computationally Efficient Reconstruction Methods
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Compressed Sensing-Accelerated Free-Breathing Liver MRI at 7 T.

Mitra Tavakkoli1,2, Bobby A Runderkamp3, Matthijs H S de Buck3,4,5

  • 1Department of Electrical and Computer Engineering, McMaster University, Hamilton, Ontario, Canada.

NMR in Biomedicine
|April 29, 2025
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Summary

This study presents a novel free-breathing 7 Tesla MRI protocol for high-resolution liver imaging, achieving detailed anatomical visualization without breath-holding. The advanced technique offers superior vascular contrast and reduced artifacts compared to 3 Tesla MRI.

Keywords:
7 T MRIabdomencompressed sensingfree‐breathinghigh‐resolutionliver

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Area of Science:

  • Radiology
  • Medical Imaging
  • Magnetic Resonance Imaging

Background:

  • Ultra-high field (UHF) MRI, specifically at 7 Tesla (7T), offers potential for high spatial resolution liver imaging.
  • Detailed anatomical and pathological assessment of the liver can benefit from improved imaging capabilities.

Purpose of the Study:

  • To develop and validate a high-resolution, phase-shimmed, free-breathing liver MRI protocol at 7T.
  • To assess the feasibility of detailed structural liver imaging without breath-holding limitations.

Main Methods:

  • Implementation of a phase-shimmed, free-breathing 7T liver MRI protocol using an eight-channel parallel transmission system.
  • Acquisition of prospectively undersampled golden-angle pseudo-spiral k-space data with retrospective respiratory binning via self-gating.
  • Reconstruction using compressed sensing, simultaneous autocalibrating and k-space estimation (SAKE), and N4BiasFieldCorrection.

Main Results:

  • Optimized protocol achieved isotropic resolutions of 1.50 mm and 1.35 mm in 3.5 minutes, clearly visualizing liver anatomy and vasculature.
  • The 7T protocol demonstrated superior vascular contrast and fewer artifacts compared to 3T MRI.
  • Comparable sharpness and SNR were observed between free-breathing 7T and short breath-hold 3T acquisitions.

Conclusions:

  • High-resolution, free-breathing liver imaging at 7T is achievable with homogeneous signal using the developed phase-shimmed protocol.
  • This technique advances ultra-high field abdominal MRI by enabling detailed anatomical depiction without breath-holding constraints.
  • The protocol represents a significant improvement for liver imaging at ultra-high field strengths.