In this study, researchers examined 1233 adults who did not have signs of colon disease.
The team found that both optical colonoscopy and virtual colonoscopy missed 10% to 14% of the polyps.
However, the virtual colonoscopies also identified "blind spots" that optical colonoscopies often miss.
The team found that lesions missed by optical colonoscopy were detected by virtual colonoscopy and vice versa.
In an accompanying editorial in the same publication, questions were raised by the evolving technology of virtual colonoscopy.
Until these questions are resolved, says the author, virtual colonoscopy is not ready for "widespread use as a screening test or as a test to monitor polyp growth."