The endoscopic diagnosis of depressed-type early gastric cancers is difficult because these cancers manifest as subtle changes in color and shape.
The newly developed optimal band imaging system can reconstruct the best spectral images derived from ordinary endoscopic images and enhances the mucosal surface without the use of dyes.
|Optimal band images without magnification identified 96% of cases|
This imaging technique is based on narrowing the bandwidth of conventional image arithmetically by using spectral estimation technology.
Dr Hiroyuki Osawa and colleagues from Japan evaluated the usefulness of the optimal band imaging system for identifying the demarcation line of depressed-type early gastric cancers.
The team identified 27 cases with depressed-type early gastric cancer.
The researchers found that demarcation of the depressed-type early gastric cancer was easily identified by optimal band images without magnification in 96% of cases.
Distinct demarcation was observed endoscopically between the reddish images of the cancerous lesion and the yellowish images of the surrounding noncancerous area.
The team noted that with 40-fold magnification of optimal band images, the demarcation was also clearly recognized in all cases.
Medical students could point out the demarcation line with significantly greater accuracy by observing the new nonmagnified optimal band images than by the conventional images.
Dr Osawa's team concluded, "The new contrasting images of the optimal band imaging system can delineate the depressed-type early gastric cancer more easily than conventional endoscopy."