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Single-shot multi-b-value (SSMb) diffusion-weighted MRI using spin echo and stimulated echoes with variable flip

Guangyu Dan1,2, Kaibao Sun1, Qingfei Luo1,3

  • 1Center for Magnetic Resonance Research, University of Illinois Chicago, Chicago, Illinois, USA.

NMR in Biomedicine
|September 23, 2024
PubMed
Summary
This summary is machine-generated.

A novel single-shot multi-b-value (SSMb) diffusion MRI technique significantly accelerates data acquisition. This method enhances efficiency in diffusion-weighted imaging (DWI) studies, enabling faster scans with comparable results to conventional methods.

Keywords:
diffusion‐weighted imaging (DWI)multiple b‐valuesspin echostimulated echovariable flip angle

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Area of Science:

  • Magnetic Resonance Imaging
  • Diffusion-Weighted Imaging
  • Biomedical Engineering

Background:

  • Conventional diffusion-weighted imaging (DWI) requires multiple sequences to vary b-values and diffusion directions for parameter calculation.
  • This multi-acquisition approach leads to extended scan times, limiting clinical applicability and patient comfort.

Purpose of the Study:

  • To develop and validate a single-shot multi-b-value (SSMb) diffusion MRI technique.
  • To assess the feasibility of SSMb for accelerating DWI acquisition and enabling advanced analyses like intravoxel incoherent motion (IVIM).

Main Methods:

  • Developed a novel SSMb sequence combining spin echo and stimulated echoes with variable flip angles.
  • Acquired multiple diffusion-weighted images with distinct b-values in a single shot using radio frequency pulses and gradient lobes.
  • Validated the technique on a diffusion phantom and healthy human brain, analyzing data with a mono-exponential model.

Main Results:

  • SSMb demonstrated high correlation (r=0.999) with commercial spin-echo EPI in phantom studies.
  • Achieved a fourfold reduction in scan time in human brain imaging.
  • Obtained comparable apparent diffusion coefficient (ADC) values to conventional methods, with slight variations attributed to diffusion time differences.

Conclusions:

  • The proposed SSMb technique substantially increases data acquisition efficiency in DWI.
  • Despite a lower signal-to-noise ratio, SSMb is feasible for rapid DWI and IVIM analysis.
  • SSMb offers a promising approach for faster and more efficient diffusion MRI studies.