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Prospective motion correction of 3D echo-planar imaging data for functional MRI using optical tracking.

Todd N, Josephs O, Callaghan MF, Lutti A, Weiskopf N - Neuroimage (2015)

Bottom Line: Metrics were developed to quantify the amount of motion as it occurred relative to k-space data acquisition.The PMC system did not introduce extraneous artifacts for the no motion conditions and improved the time series temporal signal-to-noise by 30% to 40% for all combinations of low/high resolution and slow/fast head movement relative to the standard acquisition with no prospective correction.The numbers of activated voxels (p<0.001, uncorrected) in both task-based experiments were comparable for the no motion cases and increased by 78% and 330%, respectively, for PMC on versus PMC off in the slow motion cases.

View Article: PubMed Central - PubMed

Affiliation: Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, University College London, London, UK. Electronic address: nicholas.todd@ucl.ac.uk.

No MeSH data available.


Statistical t-score maps of significantly activated voxels (uncorrected p < 0.001) from the task fMRI experiments. Results from 2 × 2 factorial design experiments showing combined activation maps from A) left and right finger-tapping stimulation and B) left and right visual hemi-field stimulation.
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f0045: Statistical t-score maps of significantly activated voxels (uncorrected p < 0.001) from the task fMRI experiments. Results from 2 × 2 factorial design experiments showing combined activation maps from A) left and right finger-tapping stimulation and B) left and right visual hemi-field stimulation.

Mentions: The results from the two task fMRI experiments are shown in Figs. 9 and 10. Fig. 9 shows representative t-score maps of activated voxels (uncorrected p < 0.001) overlaid on a high resolution structural image for each of the four conditions of the 2 × 2 factorial design. The motor task results are displayed in Fig. 9A and the visual task results are displayed in Fig. 9B. For both tasks, the t-score maps indicate that the activation for the two no motion cases is very similar, but the activation appears significantly suppressed for the condition of slow motion and PMC off.


Prospective motion correction of 3D echo-planar imaging data for functional MRI using optical tracking.

Todd N, Josephs O, Callaghan MF, Lutti A, Weiskopf N - Neuroimage (2015)

Statistical t-score maps of significantly activated voxels (uncorrected p < 0.001) from the task fMRI experiments. Results from 2 × 2 factorial design experiments showing combined activation maps from A) left and right finger-tapping stimulation and B) left and right visual hemi-field stimulation.
© Copyright Policy - CC BY
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4441089&req=5

f0045: Statistical t-score maps of significantly activated voxels (uncorrected p < 0.001) from the task fMRI experiments. Results from 2 × 2 factorial design experiments showing combined activation maps from A) left and right finger-tapping stimulation and B) left and right visual hemi-field stimulation.
Mentions: The results from the two task fMRI experiments are shown in Figs. 9 and 10. Fig. 9 shows representative t-score maps of activated voxels (uncorrected p < 0.001) overlaid on a high resolution structural image for each of the four conditions of the 2 × 2 factorial design. The motor task results are displayed in Fig. 9A and the visual task results are displayed in Fig. 9B. For both tasks, the t-score maps indicate that the activation for the two no motion cases is very similar, but the activation appears significantly suppressed for the condition of slow motion and PMC off.

Bottom Line: Metrics were developed to quantify the amount of motion as it occurred relative to k-space data acquisition.The PMC system did not introduce extraneous artifacts for the no motion conditions and improved the time series temporal signal-to-noise by 30% to 40% for all combinations of low/high resolution and slow/fast head movement relative to the standard acquisition with no prospective correction.The numbers of activated voxels (p<0.001, uncorrected) in both task-based experiments were comparable for the no motion cases and increased by 78% and 330%, respectively, for PMC on versus PMC off in the slow motion cases.

View Article: PubMed Central - PubMed

Affiliation: Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, University College London, London, UK. Electronic address: nicholas.todd@ucl.ac.uk.

No MeSH data available.