@Silvio_Grosso I upped afre_compare. It was my private convenience command to crop a subsection of the images and then place the images side-by-side for comparison along the x, y or z axis. Moreover, you may choose not to crop or crop twice for precision.
The neat thing about the cropping is that you could use the mouse wheel to scroll through the images to ensure you are finding the right region. This can be useful if each slice is significantly different, which makes me think that I might want to offer a normalization step to enhance the visualization (Edit done!).