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Method for efficient fast spin echo Dixon imaging.

Jingfei Ma1, Sanjay K Singh, Ashok J Kumar

  • 1Department of Diagnostic Radiology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA. jma@di.mdacc.tmc.edu

Magnetic Resonance in Medicine
|December 5, 2002
PubMed
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This study introduces a novel fast-spin-echo Dixon imaging method to improve MRI efficiency. The new technique enhances image quality and slice coverage without increasing scan time for water and fat separation.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Biomedical Engineering

Background:

  • Fast-spin-echo (FSE) Dixon imaging previously used time shifts for Carr-Purcell-Meiboom-Gill (CPMG) condition compliance.
  • This approach increased interecho spacing, leading to image blurring and reduced slice coverage in multislice imaging.

Purpose of the Study:

  • To develop a more time-efficient MRI technique for water and fat separation.
  • To overcome limitations of previous FSE-based Dixon imaging methods regarding image quality and scan time.

Main Methods:

  • A novel method was developed to induce echo shift by sandwiching the readout gradient with small, opposing gradients.
  • This modified acquisition strategy collects fractional echoes without increasing echo spacing.
  • Separate water-only and fat-only images are reconstructed using low-resolution and high-resolution data processing, including phase demodulation.

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Main Results:

  • The new technique achieves echo shift without increasing interecho spacing, enhancing time efficiency.
  • Image blurring and reduced slice coverage associated with previous methods are mitigated.
  • Feasibility demonstrated in phantom studies and clinical patient imaging.

Conclusions:

  • The developed method offers a more efficient approach to FSE-based Dixon imaging for water and fat separation.
  • This technique has the potential to improve diagnostic capabilities through enhanced image quality and faster scan times.
  • The findings support the clinical utility of this advanced MRI acquisition strategy.