I use this tool a lot as I have lots of ISOs in my Hard Disk, you maybe know it, but for those you don't here it is:
Create the directory where your ISO is going to be mounted
Mount your ISO file
mount -t iso9660 -o loop image.iso /media/ISO
Remember that it is just like a CDROM, so it is a read-only file system, but that is what you need really?