fMRI retrospective coregistration using external monitoring.
Published: 2004
Language: eng
Number of pages: 110
Description: Head motion during functional magnetic resonance imaging (fMRI) invalidates the key assumption that the image intensity variation within voxels is only due to neuronal activation. For this reason, coregistration is a necessary fMRI post-processing step, commonly achieved using image-based algorithms realigning images through optimization of a similarity measure based on pixels' intensities. However, coregistration can also be accomplished based on external monitoring, whereby head position and orientation are measured directly with an external tracking device.This thesis describes initial development and testing of a coregistration technique that uses an infrared tracking device for head motion monitoring during fMRI. FMRI time-series were coregistered using this external monitoring technique as well as using a common image-based algorithm for comparison. Preliminary results show similar coregistration performance for the two techniques. Importantly, this new external monitoring technique has potential for 3D prospective coregistration, as well as for retrospective and prospective coregistration of individual slices.
Notes: Adviser: Simon Graham.

Thesis (M.Sc.)--University of Toronto, 2004.

Electronic version licensed for access by U. of T. users.

Source: Masters Abstracts International, Volume: 42-06, page: 2262.

MICR copy on microfiche (2 microfiches).