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> I have tried to insert in defaults for normalization > NaN for bb and voxel size. I utilize SPM99. But by > these parameters, I obtain an image completely equal > to 0. > As to voxel size, I can insert the right values from > my CT reference. As to bb, I don't know what to > insert. I have a reference CT by voxel size of > 0.613x0.613x2 and 512x512x65 pixel. How to calculate > the parameters of bb, please? > Another question: do you think that spatial > normalization can work well also for multimodalities > images (CT-3DRA)? The NaN thing only works in SPM2. For SPM99, you can try to figure out a bounding box by: P = spm_get(1,'n*.IMAGE','Select spatially normalised image') V = spm_vol(P); vx = sqrt(sum(V.mat(1:3,1:3).^2)); if det(V.mat(1:3,1:3))<0, vx(1) = -vx(1); end; o = V.mat\[0 0 0 1]'; o = o(1:3)'; bb = [-vx.*(o-1) ; vx.*(V.dim(1:3)-o)]; disp(vx) disp(bb) Best regards, -John -- Dr John Ashburner. Functional Imaging Lab., 12 Queen Square, London WC1N 3BG, UK. tel: +44 (0)20 78337491 or +44 (0)20 78373611 x4381 fax: +44 (0)20 78131420 http://www.fil.ion.ucl.ac.uk/~john