Image Processing for the Evaluation of Gastric Ulcer Scars Using a Personal Computer

Autor: Yoshihiko Oshiumi, Toshihiko Sumii, Tokugen Ro, Toru Muranaka, Kotaro Yasumori, Michiaki Fujiwara
Rok vydání: 1996
Předmět:
Zdroj: Digestive Endoscopy. 8:287-292
ISSN: 1443-1661
0915-5635
DOI: 10.1111/j.1443-1661.1996.tb00441.x
Popis: Image processing of gastric ulcer scars was conducted using a computer-equipped electronic endoscope in order to quantitatively classify the quality of gastric ulcer scars. Frontal images of 66 gastric ulcer scars (red scar stage), in 60 patients, obtained by electronic endoscopy were fed into a desktop computer system. Ulcer scars were classified according to the standard deviation of green signal intensity and unevenness of the scar surface, following repeated application of smoothing, into three groups. Group I: ulcer scars with a standard deviation of green signal intensity less than or equal to 15 and a flat surface after smoothing had been carried out 10 times. Group II: ulcers other than Group I or III. Group III: ulcers with a standard deviation greater than or equal to 25 and markedly uneven features after smoothing had been carried out 20 times. Follow-up gastroscopy examinations were performed at 2-week intervals and the cumulative recurrence rate, as well as the transition from red scar stage to white scar phase, were determined 7 months after initial healing. There were 15 Group I, 28 Group II and 23 Group III ulcer scars. The proportion of ulcer relapse was 6.7% in Group I, 35.7% in Group II and 47.5% in Group III. Regarding the relationship between the transition rate from red scar to white scar and the scar classification, 66.7% of Group I, 28.6% of Group II and 17.4% of Group III ulcer scars progressed to the white scar stage. This classification of gastric ulcer scars provides a representative index of the quality of ulcer healing, which is potentially useful for planning maintenance treatment.
Databáze: OpenAIRE
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