Your DVD player should read the CD, depending on the format it was saved in.
Most picture files (like your x-rays) are saved in .jpg format. If you put
the disk in your computer you should be able to see what the file extension
is (that is the last 3 letters of the file name after the dot) For example
MS Word documents are something.doc, Adobe Reader files are something.pdf.
Once you know the file extension you can tell which program can read it, you
cannot change the extension to read in other programs though because that
program may or may not be able to read the file

In short my guess is that they are .jpg and your DVD should read them just
fine