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> What I did is to co-register the magnitude of the > complex pixel images and then I got the following > transformation equation. > > X1 = -0.058*X + 0.997*Y + 0.043*z -36.325 > Y1 = -0.187*X + 0.031*Y - 0.982*Z + 249.214 > Z1 = -0.981*X - 0.065*Y + 0.184*Z + 126.613 > > Somebody suggested me to try use these equations to > transfer the original images to the co-registered one. > Can somebody here tell me what these equations mean? When you coregister, SPM asks for a "reference" image, a "source" image, and "other" images. The "source" image is moved to match the "reference" image. If you specify any "other" images, then these are moved in the same way as the "source" image. This would probably have been easier. For more information about the meaning of the affine transform matrix, take a look at: http://www.fil.ion.ucl.ac.uk/~john/thesis/chapter2.pdf Best regards, -John