Dear SPM Community,

When preprosessing fMRI data, I set the origin in the fl3d-image using three one decimal numbers (then I reorient the image). Then I set the origin in the EPI-images, using three one decimal numbers. After this has been done,  I use the display function to check the images. I have noticed that in the box on the lower right end of the window, the new origin is given but without the decimals that I used when editing the header file. And looking at the image I notice that the crosshairs sometimes seems to have changed position slightly.
My question is: Does spm use the decimals when editing the header file, or should I just give the origin in whole numbers?

And: After I have set a new origin in the fl3d image, I reorient it. When the image has been reoriented, the crosshairs also seems to change position. Does this matter? Should I reorient before I set origin?

Hope you  can help!

sincerely yours,