Talks and Conference Presentations
International Society for Magnetic Resonance in Medicine
11th Scientific Meeting & Exhibition
July 10-16, 2003
Evaluating fMRI Spatial Extent in Groups with Different CNR
C. Michelich, S. Huettel, G. McCarthy, J. MacFall
A method to allow comparison of the spatial extent of fMRI activations between two groups with differing CNR was developed. The method was evaluated in two subjects and was found to successfully recover many of the active voxels across a wide range of CNRs. The error in the estimation of the size of the activation was smaller than the uncorrected case for all but the smallest CNRs. The technique increased the number of false positives and consistently overestimated the activation size while the uncorrected data underestimated the size. Further work is necessary to establish the robustness of the technique.