Matlab has countless ways to visualise images loaded into the workspace.
The problem with your file is that .dat sounds like a generic file type and Matlab won't know how to load it. Do you know if the file has an underlying file type like .tiff? Or can you convert your .dat file to an image or text file? What program do you normally use to view your .dat files?
If you upload one of your files we might be able to take a closer look.