On Wed, 17 Aug 2005 15:58:12 +0100, Stephen J. Fromm <[log in to unmask]> wrote: Thank you for your response. But there is still something I do not understand. Are the lower two figures just the result of fusion? In the result screen (while finishing coregister), there is an arrow in each of the lower two figures. When I move the arrow in the left figure, the arrow in the right figure will move with the left one at the same time. Is it just the result of coregister? Are there any steps I can take in order to obtain the "image"(SPECT combined with MR)? Thanks a lot!!