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Quantifying head motion associated with motor tasks used in fMRI.
1Imaging/Bioengineering Research, Sunnybrook & Women's College Health Sciences Centre, Toronto, Ontario, M4N 3M5, Canada.
Neuroimage
|July 27, 2001
Summary
Stroke patients exhibit significant head motion during functional magnetic resonance imaging (fMRI) scans, complicating data analysis. This study quanties head motion in stroke subjects, controls, and young adults to inform better fMRI experimental designs and motion correction techniques.
Area of Science:
- Neuroimaging
- Biomedical Engineering
- Clinical Neuroscience
Background:
- Head motion is a significant source of artifacts in functional magnetic resonance imaging (fMRI) studies.
- Existing motion correction techniques are insufficient for certain populations, particularly stroke patients.
- Understanding head motion characteristics is crucial for optimizing fMRI experimental design and data analysis.
Purpose of the Study:
- To investigate and quantify head motion characteristics in stroke subjects, age-matched controls, and young adults during motor tasks.
- To identify factors influencing head motion, including subject group and task type.
- To provide recommendations for improving head restraint designs and motion correction strategies in fMRI.
Main Methods:
- Utilized an MR simulator and a high-accuracy position tracking system to measure head motion.
- Recorded position data during hand and foot motor tasks.
- Employed Analysis of Variance (ANOVA) to assess the statistical significance of group and task effects on head motion (P < 0.05).
Main Results:
- Head motion was significantly dependent on the subject group (P < 0.05), with less dependence on task conditions.
- Stroke subjects demonstrated approximately twice the head motion of age-matched controls.
- Age-matched controls exhibited about twice the head motion of young adults.
- Stroke subjects' head motion averaged 2 +/- 1 mm, primarily in superior-inferior translation and pitch (nodding) rotation.
Conclusions:
- Stroke patients exhibit substantially greater head motion during fMRI than control groups.
- Head motion characteristics vary significantly across different subject populations.
- Improved motion correction strategies and optimized head restraint designs are necessary for accurate fMRI studies in patient populations, especially stroke survivors.