Keywords: Data Processing, Data Analysis, Geometric Distortion Correction, EPI, fMRI, Functional Mapping Accuracy, Submillimetre resolution, and Ultra-high field
Motivation: Distortion correction in EPI has been utilised in numerous fMRI studies. However, the impact of the distortion correction on submillimetre fMRI analysis remains largely unexplored.
Goal(s): This work performs quantitative and qualitative evaluation of geometric distortion correction with various criteria in submillimetre fMRI at 7T.
Approach: Submillimetre EPI (0.73 × 0.73 mm2) was employed for visual fMRI, and the distortion-corrected data were evaluated in terms of spatial resolution, functional mapping accuracy, and histogram distribution.
Results: This work demonstrates the effectiveness of distortion correction in submillimetre fMRI, revealing substantially enhanced mapping accuracy without significant deterioration in spatial resolution or functional activation distribution.
Impact: The quantitative and qualitative evaluation of EPI distortion correction presented in our work demonstrates the effectiveness of distortion correction in submillimetre fMRI at 7T, revealing substantially enhanced mapping accuracy without a significant deterioration in spatial resolution or functional activation distribution.
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