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Functional MRI for presurgical planning: problems, artefacts, and solution strategies
T Krings1, M H Reinges, S Erberich
1Department of Neuroradiology, University Hospital of the Technical University, Pauwelsstrasse 30, 52057 Aachen, Germany. tkrings@izkf.rwth-aachen.de
Journal of Neurology, Neurosurgery, and Psychiatry
|June 1, 2001
Summary
Functional MRI (fMRI) effectively maps motor function in 85% of patients. Head movement and low signal-to-noise ratio are common artifacts, but can be mitigated through data analysis and optimized tasks.
Area of Science:
- Neuroimaging
- Clinical Neuroscience
- Medical Physics
Background:
- Presurgical mapping of motor function using functional MRI (fMRI) is a critical clinical tool.
- The blood oxygenation level dependent (BOLD) contrast is the basis for fMRI.
- Understanding fMRI limitations and artifacts is essential for accurate presurgical planning.
Purpose of the Study:
- To report on 3 years of experience with 194 fMRI studies in 103 patients for motor function mapping.
- To identify common problems and artifacts encountered during fMRI studies.
- To investigate factors influencing fMRI artifacts and methods for their mitigation.
Main Methods:
- Evaluation of patient data including age, tumor characteristics, and paresis severity.
- Analysis of fMRI study outcomes and artifact presence.
- Correlation of artifacts with specific functional tasks and patient factors.
Main Results:
- fMRI successfully identified motor regions in 85% of investigated paradigms.
- 11% of studies yielded no functional localization information.
- Head movement artifacts were the primary cause of fMRI failure, followed by low signal-to-noise ratio.
- Motion artifacts correlated with paresis severity and task type (proximal vs. distal muscles).
Conclusions:
- Most fMRI artifacts can be detected and managed.
- Mathematical algorithms, optimized pulse sequences, and task design can reduce artifacts.
- Thorough evaluation of fMRI raw data, including MR signal time courses, is crucial for artifact identification and mitigation.