Image hash is being generated based on an image file itself. For example if you and I have the same image file, our image hashes will be equal.
This hash is sent just to get information about your image and show it to you in MountSpace panel.

Mountspace though has to determine unique users to get correct statistics. There is an ID value in registry in HKEY_CURRENT_USER\Software\DT Soft\DAEMON Tools Pro(Lite)\MountSpace. I can assure you that this ID is randomly generated on server without any algorithms that include your personal information..
So there is no way to identify you.