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Related Experiment Video

Updated: Oct 4, 2025

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Brain-age estimation accuracy is significantly increased using multishell free-water reconstruction.

Federico Nemmi1, Mathilde Levardon1, Patrice Péran1

  • 1Inserm Unité ToNIC, UMR 1214, CHU PURPAN - Pavillon BAUDOT, Toulouse, France.

Human Brain Mapping
|February 10, 2022
PubMed
Summary

Multishell free-water imaging (FW) more accurately predicts brain age than single-shell FW or diffusion tensor imaging (DTI) in human MRI data. Multishell FW, even with lower b-values, shows superior performance, highlighting caution for single-shell FW interpretation.

Keywords:
DTIbrain agefree-water imagingmultishell DWI

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Area of Science:

  • Neuroimaging
  • Biomedical Engineering
  • Radiology

Background:

  • Diffusion-weighted imaging (DWI) free-water (FW) reconstruction is applicable to single-shell and multishell data.
  • Synthetic data suggests single-shell FW indices require careful interpretation due to initialization parameter influence and inability to differentiate FW from mean diffusivity changes.
  • The efficacy of multishell acquisition protocols for improving FW reconstruction in real human MRI data remains an open question.

Purpose of the Study:

  • To compare the predictive power of canonical diffusion tensor imaging (DTI), single-shell free-water imaging (FW), and multishell FW indices for estimating brain age.
  • To evaluate the performance of these indices using a short, clinically compatible diffusion MRI protocol.
  • To assess the impact of acquisition parameters, specifically b-values, on the accuracy of brain age estimation.

Main Methods:

  • Utilized a data-driven, whole-brain machine learning pipeline for direct comparison of brain age estimation precision.
  • Analyzed data from 89 healthy males aged 20-85 years.
  • Compared canonical DTI, single-shell FW, and multishell FW indices derived from a protocol with b = 500 s/mm² and b = 1,000 s/mm², each with 32 directions.

Main Results:

  • Multishell FW indices demonstrated superior performance in estimating brain age compared to DTI indices.
  • Multishell FW outperformed single-shell FW in brain age prediction, even when utilizing a secondary shell with a low b-value (500 s/mm²).
  • Single-shell FW indices resulted in lower brain age estimation accuracy than canonical DTI indices, indicating potential limitations.

Conclusions:

  • Multishell free-water imaging offers improved accuracy for brain age prediction in human MRI data compared to single-shell FW and DTI.
  • The findings underscore the need for caution when interpreting single-shell FW indices due to their susceptibility to initialization parameters and potential confounding factors.
  • Indices measuring free diffusion of water in white matter were the most discriminant across all reconstruction algorithms, suggesting their importance in neuroimaging analyses.