[New detection method for small and very small gastric carcinoma using brightness-curve analysis with double contrast...

The purpose of this study was to find an indexing feature for small gastric carcinoma taken by double contrast radiography, and to propose a new method for detecting lesions. We considered the method from the viewpoint of the detection and diagnosis of lesions. The inclination curve of the density of a small gastric carcinoma, Type IIc + IIa, with a depth of cancerous invasion of M, taken by the double contrast method was investigated. The curve of density that was obtained clearly showed the change and inclination of density that was proper for the shape of the surface of the lesion and seemed to be good for pointing out the lesion and for reproducing a new image of the lesion. Our results were as follows: The area surrounding the depressed lesion appeared as a steep-gradient brightness curve (with or without surrounding raised margin), and the frequency brightness-curve of the bottom of the lesion showed less frequency than that of the surrounding non-cancerous region. These results indicate that this proposed method is effective for the detection of small gastric carcinoma taken by double contrast radiography, although the process of elimination of false positives should be improved.