Unless the backup is corrupted, then it *should* contain any photos you may be missing. iTunes will backup camera roll photos only. So if they were photos taken with the iPhone then they should be included.
For reasons unknown your iPhone software has crashed so at this point the best bet is to restore this backup. You can double-check what photos may be there first by downloading and running the following software:http://www.iphonebackupextractor.com
When it runs, it should detect this backup. Do NOT extract anything but see what it lists for Photos. It should tell you the number of photos backed up.
Once you do that, assuming it shows photos are in the backup then you can safely plug the iPhone back in and let iTunes Restore the backup. It should lead you through the process and take around 20-30 minutes, give or take, depending on the speed of your internet connection.
If you continue to have questions on this topic, just reply back to this discussion. I will be more than happy to work with you further. Hopefully, this info will answer your question. If so please, please remember that when you are asked to give a rating, you are rating my personal service only and not this website itself or your issue.
Thanks and good luck,