Extracting SVN revisions used in a review

Generally speaking, we create our reviews based on specific SVN revisions.  Is there a way to extract what SVN revisions are included in a review?  It appears like this information is simply not stored as part of the detailed information of a review.  We're using CC v9.3.9300.

Ultimately, I'm looking to create a script that compares SVN revisions against reviews so that I can determine which revisions have not been reviewed.