Instead of using disk utility (or whatever) to burn the image to the DVD, use finder to copy the 4 image file (presuming a dmg file) to the DVD and burn it. Now after you load the DVD into the driver, mount all 4 images.
If they're already on the computer why would you want to put them on a DVD? why not just mount the images?
A real expert is going to have to answer that but I think not... I can only mount two because of the internal DVD and an external DVD... so if you had four external DVDs that should do it nicely.