Imaging through the bowel backwards

Colonoscopy is widely regarded as the gold standard for detection of abnormalities in the colon. However, research has revealed that 12-24% of polyps and a significant number of cancers can be missed during colonoscopy due to folds in the colon wall.

Now aninnovative scope developed by Avantis Medical Systems (Sunnyvale, CA, USA) provides a retrograde view or “rear view” to allow a physician to see behind folds in the colon wall, where cancers may be hiding.

According to a study published in the March issue ofGastrointestinal Endoscopy, when used in conjunction with a traditional forward-looking colonoscope, the device -- the Third Eye Retroscope -- has been able to diagnosing adenomas, or pre-cancerous polyps, 23.2% more effectively.

The OV6930CMOS image sensor from OmniVision Technologies (Santa Clara, CA, USA) used in the Retroscope was designed specifically for use in low-light medical devices. Its 1/10-in. array is capable of operating up to 30 frames/s in 400 x 400 HVGA mode or 60 frames/s in 400 x 200 mode.

"With currently more than 150,000 cases of colorectal cancer reported annually in the US, and more than 400,000 in Europe, it is the second-leading cause of cancer-related deaths in the US and Europe," says Doug Gielow, vice president of sales and marketing at Avantis. "However, using today'sadvanced imaging technologies, it can be highly preventable through early detection."

-- By Dave Wilson, Senior Editor,Vision Systems Design