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Related Experiment Videos

Spin-echo versus gradient-echo fMRI with short echo times.

P W Stroman1, V Krause, U N Frankenstein

  • 1MR Technology Group, Institute for Biodiagnostics, National Research Council of Canada, Winnipeg, Manitoba, Canada. stroman@ibd.nrc.ca

Magnetic Resonance Imaging
|September 12, 2001
PubMed
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Blood-oxygen-level-dependent (BOLD) signal changes in the visual cortex were studied using spin-echo and gradient-echo EPI. Both methods show similar BOLD signals at short echo times, despite differences in intercept values.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Neuroimaging
  • Functional MRI (fMRI)

Background:

  • Blood-oxygen-level-dependent (BOLD) contrast is a cornerstone of functional MRI (fMRI).
  • Understanding BOLD signal behavior across different pulse sequences and field strengths is crucial for accurate interpretation.
  • Echo time (TE) is a critical parameter influencing BOLD signal characteristics.

Purpose of the Study:

  • To investigate BOLD signal changes in the visual cortex as a function of echo time.
  • To compare spin-echo (SE) and gradient-echo (GRE) echo-planar imaging (EPI) at 1.5 T and 3 T.
  • To evaluate the impact of TE on BOLD signal linearity and intercept values.

Main Methods:

  • Functional MRI (fMRI) using spin-echo (SE) and gradient-echo (GRE) echo-planar imaging (EPI).

Related Experiment Videos

  • Experiments conducted at 1.5 Tesla (T) and 3 T magnetic field strengths.
  • Analysis of BOLD signal changes in the visual cortex across a range of echo times.

    • Main Results:

    • A linear relationship between fractional signal change and echo time was observed for both SE-EPI and GRE-EPI.
    • Relaxation rate changes derived from the slope agreed with published values.
    • Intercept values at zero echo time differed significantly: 0.66%–1.0% for SE-EPI versus 0.11%–0.35% for GRE-EPI.

    Conclusions:

    • Spin-echo EPI and gradient-echo EPI can achieve comparable BOLD signal changes when utilizing sufficiently short echo times.
    • The differing intercept values highlight distinct baseline signal characteristics between SE-EPI and GRE-EPI.
    • This finding has implications for optimizing fMRI acquisition parameters for specific research questions.