[QUOTE=Broomstick]
I base my statement on a research radiologist who was paid to evaluate such risks. The problem isn’t so much a one-time CAT scan, but the number of such scans a person is likely to get in a given time period.
[/QUOTE]
Broomstick, I am certainly not trying to argue about the appropriateness of an optical colonoscopy for you as an individual, especially given what you have since shared. I was simply disagreeing with your statement, “No, it’s not. Certainly, there are people trying to make such a thing true, but we’re not there yet.”
I think it’s obvious that there is still a place for optical colonoscopy, but to say that virtual colonoscopy is simply not an option as a screening tool in 2007 just isn’t true. Perhaps not for you, but for the general population, it is. It is very similar in sensitivity, specificity, tolerability, and safety. I would argue that it exceeds optical colonoscopy in some of these criteria and will likely improve much faster than optical colonoscopy.
Again, the debate is vigorous, there are advantages to either, but virtual colonoscopy has safety advantages in some respects over optical colonoscopy, and it has cancer risks that optical colonoscopy doesn’t have.
For anyone that is interested, I’ve found this article from to be an exceptional review of the issue of radiation exposure in CT scans. It’s not alarmist, but it does make a fairly convincing arguement that some CT use should be more carefully considered, particularly in pediatric patients and especially when other daignostic modalities are available.
http://content.nejm.org/cgi/reprint/357/22/2277.pdf
For context, optical colonoscopy has a bowel perforation risk of around 1-2 per 1,000 per procedure.