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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Fast, Robust T2-IVIM Quantitative MRI With Distortion and Motion-Corrected Multi-Echo EPI.

Liam Timms1, Mustafa Utkur1, Cemre Ariyurek1

  • 1Department of Radiology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts, USA.

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|January 24, 2026
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This study introduces a faster multi-echo MRI method for accurate T2-IVIM parameter estimation. The new technique significantly reduces scan time for diffusion-weighted imaging, improving liver coverage and robustness.

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Area of Science:

  • Magnetic Resonance Imaging
  • Diffusion-Weighted Imaging
  • Quantitative MRI

Background:

  • Intravoxel Incoherent Motion (IVIM) imaging provides insights into tissue microdynamics.
  • T2-IVIM modeling offers compartment-specific T2 estimates, enhancing IVIM analysis.
  • Robust parameter estimation is crucial for clinical translation of IVIM techniques.

Purpose of the Study:

  • To develop a motion- and distortion-corrected T2-IVIM parameter estimation method.
  • To achieve clinically feasible scan times for abdominal diffusion-weighted MRI.
  • To enable robust estimation of T2-IVIM parameters.

Main Methods:

  • Utilized a single-shot, multi-echo spin-echo EPI sequence for abdominal diffusion-weighted MRI.
  • Implemented time-efficient sampling of b-value and TE pairs.
  • Applied motion and distortion correction, followed by joint T2-IVIM model fitting across b-value and TE dimensions.

Main Results:

  • Achieved motion- and distortion-corrected T2-IVIM mapping in under 5 minutes.
  • Demonstrated comparable per-voxel uncertainty to a minimal single-echo protocol.
  • Showcased improved liver coverage and reduced scan time by over 50% compared to prior protocols.

Conclusions:

  • The multi-echo sequence design and artifact correction enable stable T2-IVIM fitting.
  • This advanced method supports broader clinical applicability of T2-IVIM imaging.
  • Reduced acquisition burden enhances artifact correction and parameter robustness for T2-IVIM.