1993 Volume 42 Pages 77-80
Images processed by adaptive enhancement using an Olympus image input and processing system (IP system) were studied to determine the extent of superficial spread of early gastric cancer.
Analog signals input via a change coupled device (CCD) were converted into digital signals and the target frequency components were amplified to maximum levels of 2, 3 and 5 times for three-level enhancement processing. Discolored and reddish lesions produced the highest quality images at a frequency enhancement maximum of 2 (Peak 2) , resulting in improved image clarity.
The color tone, capillary networks and borders of discolored lesions (9 cases) were clearly visualized in all cases and the system effectively defined the extent of superficial in about 80% of lesions. For one discolored lesion, the gastric mucosal pattern and lesion margin were more clearly defined compared with before processing. The capillary network and lesion margin of all reddish lesions (5 cases) could be defined, and the system was effective for all cases.
However, problems currently exist in regard to processing time and image quality, necessitating the development and improvement of peripheral instrumentation.
