PowerPoint Presentation - Activation Delays in FMRI: Estimation and Variability

7/2/2004 SSCC/NIMH 41

Mapping data: Volume à Surface

•Use 3dVol2Surf to map individual subject data onto each surface

HExample: Mapping functional data onto surface, with thresholding

3dVol2Surf

-spec          ../SurfData/SUMA/DemoSubj_lh.spec   \
   -surf_A        lh.smoothwm.asc                    \
    -surf_B        lh.pial.asc                         \
   -sv            DemoSubj_SurfVol_Alnd_Exp+orig       \
   -grid_parent   DemoSubj_EccExpavir.DEL+orig           \
   -cmask         '-a DemoSubj_EccExpavir.DEL+orig[2] \
   -expr step(a-0.5)'                 \
   -map_func      ave                                 \
    -f_steps       10                            \
-f_index       nodes                       \
     -oom_value     -1.0                                \
    -oob_value     -2.0                                \
     -out_1D        out_Del.1D.dset
by Rick Reynolds