Below are a series of short lecture topics which you may find useful.

Epidemiology of colon cancer and screening recommendations
Results of published clinical trials
Review of colon cleansing preparations
Stool tagging agents
Guide to colonic insufflation
Virtual Colonoscopy: Scanner protocols
Virtual Colonoscopy: Radiation issues
Interpretation Strategies: 2D vs. 3D
Software aids and reporting guidelines
Reimbursement issues
How to build a VC program
Training guidelines and resources
Virtual Colonoscopy: Tips for the technologist