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Related Experiment Videos

Minimum detectable change in water diffusion using 3-T magnetic resonance imaging.

Raymond W-M Lau1, Bradley G Goodyear

  • 1Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada.

Neuroimage
|May 1, 2007
PubMed
Summary
This summary is machine-generated.

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Diffusion tensor imaging (DTI) can reliably detect changes in white matter using fractional anisotropy (FA), mean diffusivity (MD), and transverse diffusivity (TD). Three DTI scan averages are sufficient for 95% confidence in detecting these changes.

Area of Science:

  • Neuroimaging
  • Diffusion Tensor Imaging (DTI)

Background:

  • Diffusion tensor imaging (DTI) is a neuroimaging technique that measures water diffusion in brain tissue.
  • Fractional anisotropy (FA), mean diffusivity (MD), and transverse diffusivity (TD) are key DTI metrics reflecting white matter integrity.

Purpose of the Study:

  • To determine the minimum detectable change (MDC) in FA, MD, and TD with 95% confidence in repeated DTI sessions.
  • To establish the optimal number of DTI scan averages for reliable detection of white matter changes.

Main Methods:

  • Eight volunteers underwent three DTI sessions, with six DTI sets collected per session using a 3-T MR scanner.
  • Mean FA, MD, and TD values were analyzed in specific brain regions: corpus callosum, corticospinal tract, putamen, optic radiation, and ventricular CSF.

Related Experiment Videos

  • Analysis of variance (ANOVA) was used to calculate the minimum detectable change (MDC).

    • Main Results:

    • MDC decreased with increased data averaging, with no significant improvement beyond three averages.
    • The lowest MDC was observed in the corticospinal tract and putamen with three averages: 0.04 for FA, <30 x 10(-6) mm2/s for MD, and <40 x 10(-6) mm2/s for TD.
    • These findings indicate that DTI is sensitive to subtle white matter alterations.

    Conclusions:

    • DTI is clinically applicable for detecting subtle changes in FA, MD, and TD in individual patients with neurological diseases over repeated sessions.
    • DTI can be utilized in research to investigate white matter changes associated with behavioral modifications, such as learning, in individual subjects.