Hi, You can multiple matrices (or concatenate the transforms) with convert_xfm. Not sure what you mean by multiplying the matrix and an image. You can apply the transform to the image using flirt with the -applyxfm option. I hope that answers your question. All the best, Mark On 21 Nov 2008, at 12:18, Oliver Trebbe wrote: > Hello, > > i first need to multiply 2 matrices comming from FLIRT, > and then use the new matrix to multiply it with my image. > Is it possible to use a programm from FSL (FSLMATHS) or do i need > another > prog? e.g. Matlab or something else? > > regards > > Oliver Trebbe >