Improved virtual colonoscopy

Researchers are developing new techniques to increase the accuracy of virtual colonoscopy. Two new developments include:

• Computer-assisted virtual colonoscopy. Researchers have developed computer software that can read virtual colonoscopy images. These programs are designed to detect suspicious areas and alert the radiologist conducting the exam to take a second look. Computer-assisted virtual colonoscopy can help radiologists examine the many images created for each person, saving time and serving as a "second opinion" for each exam. However, computer-assisted virtual colonoscopy creates a high rate of false-positive results, since computers have difficulty distinguishing normal folds in the colon from polyps. More rigorous study of computer-assisted virtual colonoscopy is needed before this technique can be considered for widespread use.
• Minimal-preparation virtual colonoscopy. The process of clearing stool from the colon is uncomfortable for many people. Doctors hope to develop a way to minimize or eliminate the need to clear your colon before colon cancer screening. In one technique that has been studied, people undergoing virtual colonoscopy drink a smoothie containing barium with each meal the day before the procedure. The barium attaches to the food. When the food is seen as stool during the colonoscopy, radiologists are able to distinguish between stool and potential polyps. This method of screening has the potential to create more false-positive results. More study is needed to determine the best way to label stool.