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Optimal band imaging with endoscopy facilitates the diagnosis of depressed-type early gastric cancer
Date:2/18/2008

OAK BROOK, Ill. February 18, 2008 A study from the Jichi Medical University in Japan shows that optimal band imaging used with an endoscope provided images that clearly identified depressed-type early gastric cancer without magnification in 96 percent of study participants. The study appears in the February issue of Gastrointestinal Endoscopy, the monthly peer-reviewed scientific journal of the American Society for Gastrointestinal Endoscopy.

Gastric cancer is one of the most prevalent types of cancer in the world. If gastric cancer is found early, the five-year survival rate increases nearly 90 percent. In contrast, most patients with advanced gastric cancer have a poor prognosis. Gastric cancer is classified as elevated, flat and depressed types. Despite improvements in endoscopic technologies, depressed-type early gastric cancer is challenging to diagnose because it manifests as subtle changes in color and shape. Variations in color, however, can also mean inflammation, so it is difficult to determine what is benign and what is malignant. Therefore, biopsies must then be taken.

In our comparative study, the optimal band imaging system with endoscopy showed contrasting images that could delineate the depressed-type early gastric cancers more easily than conventional endoscopy, said the studys lead author Hiroyuki Osawa, MD, Jichi Medical University. A distinct demarcation was observed endoscopically between the reddish images of the cancerous lesion and the yellowish images of the surrounding noncancerous area. This is the first report of optimal band images for early gastric cancer.

Optimal band imaging (OBI) was developed with the aim of enhancing the capillary pattern and pit patterns of lesions in endoscopic images. In contrast to narrow band imaging, in which the bandwidth of spectral transmittance is narrowed by optical filters, the OBI system is based on a new spectral estimation technique that replaces the need for op
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Contact: Anne Brownsey
abrownsey@asge.org
630-570-5635
American Society for Gastrointestinal Endoscopy
Source:Eurekalert

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