Dear Rafael, Not sure of this, but the results that you describe may be the result of a misalignment between your statistical map and your surface.
It somehow seems that SPM and CARET are not using the niftii positioning information exactly the same, but for me it works when I coregister&reslice a statistical map to the T1-image (as put in Talairach orientation before segmentation), and then map the resliced statistical image to the surface. Hope this helps. Regards, Mathijs ________________________________ Van: [email protected] namens Raphael Hilgenstock Verzonden: do 19-8-2010 13:56 Aan: [email protected] Onderwerp: [caret-users] SPM8 - Mapping Functionals to Volume problem Dear List, I`ve got a problem mapping SPM8 t- and F-contrasts to Caret surfaces. Unfortunately I even don`t know if it is possible to map SPM8 images to Caret as haven`t found any informationen on the compatibility of both programs (even on the list). Is there a difference between SPM5- and SPM8-space that has to be accounted for when projecting activations?! I`m asking because I ran across the following problem: I processed data to map activations using the Tutorial_Sept_06 (provided on the Sumsdb site) click by click with the Human.PALS_B12.BOTH.TEMPLATE-for-fMRI-MAPPING.73730.spec-file (is this approach still the standard of mapping functional files to volumes?). When I mapped an F-contrast (spm_F.hdr and .nii) on an inflated brain there where more spots (and some spots in strange locations) on my MFM-image than on my SPM. When I mapped a t-contrast (spm_T.hdr and .nii) all activations were gone! When lowering the threshold also this (T-)map is showing activations that can be expected from my SPM but also "new" acitavtions. The MFMs were thresholded with my SPM t/F-treshold and the treshold type in Caret set to "column" (does this acutally mean that just the information (t/F-values) form the the spm_T/F image is read without any changes to the threshold by Caret? I infered that from posts I read but I´m not yet definitively sure). As suggested in another post I also used different algorithms (e.g. Metric-Gaussian). However the result is still the same. I´m most concerned about strange activation foci that I won`t find in my SPMs. Is there anything I did wrong?! Any hint or help would be greatly appreciated. Thanks & best regards Raphael ___________________________________________________________ Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de <http://messenger.yahoo.de/> _______________________________________________ caret-users mailing list [email protected] http://brainvis.wustl.edu/mailman/listinfo/caret-users ------------------------------------------------------------------------------ De informatie opgenomen in dit bericht kan vertrouwelijk zijn en is uitsluitend bestemd voor de geadresseerde. Indien u dit bericht onterecht ontvangt, wordt u verzocht de inhoud niet te gebruiken en de afzender direct te informeren door het bericht te retourneren. Het Universitair Medisch Centrum Utrecht is een publiekrechtelijke rechtspersoon in de zin van de W.H.W. (Wet Hoger Onderwijs en Wetenschappelijk Onderzoek) en staat geregistreerd bij de Kamer van Koophandel voor Midden-Nederland onder nr. 30244197. Denk s.v.p aan het milieu voor u deze e-mail afdrukt. ------------------------------------------------------------------------------ This message may contain confidential information and is intended exclusively for the addressee. If you receive this message unintentionally, please do not use the contents but notify the sender immediately by return e-mail. University Medical Center Utrecht is a legal person by public law and is registered at the Chamber of Commerce for Midden-Nederland under no. 30244197. Please consider the environment before printing this e-mail.
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