New Methods & MaterialsEffectiveness of the near-infrared electronic endoscope for diagnosis of the depth of involvement of gastric cancers☆,☆☆
Section snippets
Near-infrared electronic endoscopy system
Our near-infrared electronic endoscopy system is composed of a light source, special filters, a distally mounted charge-coupled device (CCD), and a forward-viewing electronic videoendoscope (GIF-Q200 IR; Olympus Optical Co., Ltd., Tokyo, Japan) (Fig. 1).
. Schematic diagram of the near-infrared electronic endoscope system.
Light produced by a xenon lamp (CLV-U20D IR; Olympus) first passes through either an infrared cut filter or an 805 nm band pass filter. The filters can be selected with a switch
Relationship between infrared endoscopic findings and depth of involvement of cancers
The endoscopic infrared appearance of the tumor and the depth of involvement of the tumors were strongly correlated (Table 1).
. Depth of involvement of gastric cancers in relation to the infrared endoscopic findings*Empty Cell Empty Cell Depth of tumor invasion (%) Infrared endoscopic findings Mucosal Submucosal or deeper Total No stain 3 (100) 0 (0) 3 (100) Tumor stain Homogeneous 6 (75) 2 (25) 8 (100) Inhomogeneous 1 (10) 10 (90) 11 (100) Pooling of the dye 0 (0) 2 (100) 2 (100) *Tumors with an inhomogeneous tumor stain or with pooling
Discussion
Our newly developed infrared electronic endoscope system was found in the present study to be useful for diagnosing the depth of involvement of gastric cancers either with or without ulcerative change.
Our previous development of this method of infrared photography of the human gastric mucosa used a fiberoptic gastroscopic camera and infrared film.16 With this technique, the pattern of deep vessels, which could not be seen with conventional methods, could be clearly visualized. However, this
Acknowledgements
We thank Olympus Optical Co., Ltd., for their technical support.
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Cited by (0)
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Supported in part by a Grant-in-Aid for the Cancer Research (No. 10-37) from the Ministry of Health and Welfare of Japan.
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Reprint requests: Kazushige Iseki, MD, Department of Gastroenterology, Osaka Medical Center for Cancer and Cardiovascular Diseases, 3-3, Nakamichi 1-chome, Higashinari-ku, Osaka 537-8511, Japan.