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Improved abdominal T1 weighted imaging at 0.55T.

Bilal Tasdelen1, Nam G Lee1, Sophia X Cui2

  • 1Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, California, USA.

Magnetic Resonance in Medicine
|July 12, 2024
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Summary

New 3D stack-of-spirals Dixon MRI at 0.55T achieves excellent fat suppression and high resolution for abdominal imaging. This technique offers improved definition of organs like the liver and kidneys in a single breath-hold.

Keywords:
0.55 teslaabdominal MRIfat suppressionfat‐water separationmid‐field MRI

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Low-Field MRI

Background:

  • Breath-held fat-suppressed volumetric T1-weighted MRI is crucial for abdominal evaluation.
  • Conventional fat suppression methods (saturation, Dixon) face challenges at low field strengths (<1.5T), causing insufficient fat suppression and poor resolution.
  • Short T1 of lipid limits fat saturation, while long delta TE in Cartesian Dixon imaging reduces spatial resolution at lower fields.

Purpose of the Study:

  • To demonstrate a novel approach for simultaneous excellent fat suppression and high spatial resolution abdominal MRI at 0.55T.
  • To overcome limitations of conventional fat suppression techniques at lower magnetic field strengths.

Main Methods:

  • Application of 3D stack-of-spirals Dixon imaging at 0.55T with concomitant field phase correction during reconstruction.
  • Efficient utilization of echo time difference (ΔTE) through spiral readouts.
  • Comparison with 3D Cartesian Dixon imaging in healthy volunteers and patients with elevated liver fat.

Main Results:

  • 3D stack-of-spirals Dixon imaging at 0.55T effectively utilized the required ΔTE, offering high signal-to-noise ratio (SNR) efficiency.
  • Achieved finer spatial resolution (1.7 × 1.7 × 5 mm³) compared to Cartesian Dixon (3.5 × 3.5 × 5 mm³).
  • Demonstrated successful fat suppression and enhanced visualization of abdominal structures within a 17-second breath-hold.

Conclusions:

  • High-resolution, single breath-hold volumetric abdominal T1-weighted MRI is feasible at 0.55T using spiral sampling and concomitant field correction.
  • This spiral-based method presents an attractive alternative to Cartesian techniques, providing simultaneous high resolution and excellent fat suppression.
  • The technique improves the definition of abdominal organs like the liver, kidneys, and bowel.