Related Experiment Videos
Brain mapping with functional MR imaging: comparison of gradient-echo--based exogenous and endogenous contrast
V S Mattay1, D R Weinberger, F A Barrios
1Laboratory of Diagnostic Radiology Research, National Institutes of Health, Bethesda, MD 20892.
Radiology
|March 1, 1995
Summary
Dynamic contrast-enhanced MR imaging shows greater activation than blood oxygenation level-dependent (BOLD) MR imaging in healthy volunteers. This functional MRI technique offers improved signal change and activated area detection.
Area of Science:
- Neuroimaging
- Functional Magnetic Resonance Imaging
Background:
- Functional MRI (fMRI) is crucial for understanding brain activity.
- Dynamic contrast-enhanced (DCE) and blood oxygenation level-dependent (BOLD) are leading fMRI techniques.
Purpose of the Study:
- Directly compare DCE-MRI and BOLD-MRI efficacy.
- Evaluate functional MRI methods for brain activity detection.
Main Methods:
- Five healthy volunteers underwent visual stimulation and dark control states.
- BOLD and DCE-MRI were performed using a 1.5-T MR unit.
- Gradient-echo and echo-shifted gradient-echo sequences were utilized.
Main Results:
- DCE-MRI demonstrated a significantly higher percentage signal change compared to BOLD-MRI.
- The extent of the activated brain area was significantly greater with DCE-MRI.
- Both techniques used standard clinical imagers and gradient-echo sequences.
Conclusions:
- DCE-MRI achieves greater percentage and area of activation than BOLD-MRI.
- DCE-MRI offers enhanced sensitivity for detecting functional brain activation.
- These findings support DCE-MRI as a powerful tool in neuroimaging research.