Pit Pattern Diagnosis of Colorectal Tumors by Adaptive Band-enhancement Hirotomo Ohtsuka 1 , Masahiro Tada 2 , Seiji Shimizu 3 1Department of Emergency Medicine, Kyoto First Red Cross Hospital 2Division of Gastroenterology, Kyoto Cancer Society 3Department of Gastroenterology, Kyoto First Red Cross Hospital Keyword: 画像解析 , 帯域強調処理 , 腺ロ形態 , 表面型大腸腫瘍 pp.1401-1406
Published Date 1996/10/25
DOI https://doi.org/10.11477/mf.1403104433
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 We employed an image processor (EVIP-230,Olympus) to improve the recognition of pit patterns of colorectal tumors. To reveal the usefulness of adaptive band-enhancement, we compared pit pattern identification-rate when using ordinary observation, edgeenhancement and band-enhacement in 284 cases of colorectal tumors including 224 protruded lesions and 60 superficial ones. Additionaly, we investigated the relation between the characteristics of depression and histological diagnosis in 56 cases of superficial lesions with depression.

 As a result, band-enhancement was shown to be superior to other types of observation in recognizing pit patterns of colorectal tumors, especially for superficaltype lesions. Further improvement in differential diagnosis was able to be achieved by classifying the patterns and measuring the proportion of depression. When the shape of the depression was spicular or asteroid, histological diagnosis was adenoma. In contrast, when it was round to ovoid, histological diagnosis was early cancer in 93.3%. The proportion of depression to the whole lesion (depression index) was 0.17 ± 0.1 in adenomas and 0.48 ± 0.2 in early cancers. Significant difference was observed between the two groups.

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