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Related Experiment Videos

A comparative fMRI study: T2*-weighted imaging versus R2* mapping.

A B Wennerberg1, T Jonsson, H Forssberg

  • 1Department of KARO, Division of Diagnostic Radiology, Karolinska Institutet, Huddinge University Hospital, SE-141 86 Stockholm, Sweden.

NMR in Biomedicine
|March 17, 2001
PubMed
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This study compared T2*-weighted imaging and R2* mapping for functional magnetic resonance imaging brain mapping. R2* mapping offers higher functional contrast but lower activation volume due to reduced signal-to-noise ratio.

Area of Science:

  • Neuroimaging
  • Functional Magnetic Resonance Imaging (fMRI)
  • Brain Mapping

Background:

  • Functional magnetic resonance imaging (fMRI) is crucial for brain mapping.
  • T2*-weighted imaging and R2* mapping are common fMRI techniques.
  • Quantitative comparison of these methods is essential for optimizing brain activation detection.

Purpose of the Study:

  • To quantitatively compare T2*-weighted imaging and R2* mapping for human motor cortex brain mapping.
  • To evaluate key parameters: activation volume, functional contrast (FC), signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR).
  • To identify the advantages and limitations of each method for fMRI applications.

Main Methods:

  • fMRI experiments conducted on human motor cortex at 1.5 T.

Related Experiment Videos

  • Acquisition of two successive gradient recalled echo images in a single shot.
  • Quantitative analysis of T2*-weighted imaging and R2* mapping parameters.

    • Main Results:

    • R2* mapping demonstrated higher functional contrast (FC) compared to T2*-weighted imaging.
    • R2* mapping resulted in a smaller activation volume, attributed to reduced signal-to-noise ratio (SNR) and inflow effects.
    • Sensitivity for activation detection strongly correlated with contrast-to-noise ratio (CNR), influenced by both SNR and FC.

    Conclusions:

    • R2* mapping offers superior functional contrast in fMRI, potentially reducing dependence on echo time (TE) and inflow effects.
    • Despite higher FC, R2* mapping's utility is limited by lower SNR and activation volume.
    • Contrast-to-noise ratio (CNR) is a critical determinant of activation detection sensitivity in fMRI brain mapping.