Horizontal Image Shift

[Limitless]

Hi,

I have 16 X-ray grey scale images (8-bit), all of which have been taken at different angles.

I need change the horizontal shift of the images and add them together so I can move through the focal plane.

Here is a link to the 16 images that I am trying to process: http://www.sendspace.com/file/cnwzmk

Any help would be much appreciated.

Thanks.