Dear Vasudev,

in order to analyze 3D (voxel) measures on the surface it is necessary to map these measures from 3D space to the surface. This is not yet prepared for DTI data, but works well for fMRI data. Please use the function CAT12 -> Extract & Map Surface Data -> Map Volume (Native Space) to Individual Surface. The default values in newer versions (check that sample function is set to "Absolute Maximum") maps the absolute maximal values inside gray matter from the volume to the individual surface. These mapped values can then be resampled to template space for analysis using the function CAT12 -> Resample & Smooth Surfaces. Please note that it is recommend to rather map unsmoothed to the surface which are then resampled and smoothed on the surface. Smoothing on the surface is of some advantage. However, I have no experience with rfMRI data and don't know whether there any drawbacks to estimate rfMRI maps from unsmoothed data.

The above described procedure allows to separately analyze 3D measures on the surface. However, I am not aware of a software that allows the analysis of multi-modal data to combine these measures.

Best,

Christian

On Tue, 24 Jan 2017 15:33:26 +0100, Dev vasu <vasudevamurthy.devulapally@GMAIL.COM> wrote:

>Dear all,
>
>I have multi modal imaging data (T1w,DTI,rfMRI) and i would like to perform
>surface based preprocessing through SPM 12 , is there any tool box which
>does  such task, I know CAT 12 generates .gii images for Structural Imaging
>data, is there any approach for DTI and rfMRI to generate surface files ?.
>
>
>Thanks
>Vasudev
>