CAPABILITY OF EACH SPECTRUM OF VISIBLE RAYS REPRESENTING UPPER GASTROINTESTINAL DISEASE

Abstract

In order to study the difference in capability among spectral bands of visible rays to represent a lesion of the upper gastrointestinal tract, pictrial-image output part of videoendoscope system is devised to enable to select one analog signal among R. G. and B components and conventional pictorial image signals at random. The subjects for this study; 18 cases of gastric ulcer, 16 cases of duodenal ulcer, 8 cases of gastric cancer, 17 cases of gastric polyp, 26 cases of various gastritis, and 10 other cases. By comparing each pictorial image on real time from each of 3 components with conventional ones, the following results were obtained. The pictorial image by only G component is superior to representing the fine mucosal structure because of the following reasons. 1) It has more information about the structure. 2) It changes its luminance a lot. 3) A minimun difference threshold of G component exists in the same spectrum. 4) It fits well enough to the spectral luminous efficacy of our eyes. It is difficult for the pictorial image by only B component to represent the fine mucosal structure because of the following reasons. 1) The pictorial image of B component does not have enough signal volume. 2) Adding to 1) biasis of brightness makes the pictorial images dark and unclear. The pictorial images of only R component is not able to represent the fine mucosal structures because of penetrability through tissue of R component is higher than those of G and B components. But it is suggested that the pictorial image of R component produces a line to that of infra-red rays.