Computer-assisted Diagnostic System for Ultrasonography Using Fuzzy Reasoning : -Consideration of Defuzzification Procedure-

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  • Tanaka Takemasa
    Department of Oral and Maxillofacial Radiology, Faculty of Dentstry, Kyushu University
  • Kawazu Toshiyuki
    Department of Oral and Maxillofacial Radiology, Faculty of Dentstry, Kyushu University
  • Kanda Shigenobu
    Department of Oral and Maxillofacial Radiology, Faculty of Dentstry, Kyushu University

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Other Title
  • ファジィ理論による超音波診断支援システム : 確定法(非ファジィ化)に関する検討
  • ファジィ リロン ニ ヨル チョウオンパ シンダン シエン システム カクテイホウ ヒファジィカ ニ カンスル ケントウ

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Abstract

The authors have developed a computer-assisted diagnostic system for ultrasonograpny using fuzzy reasoning. In this system, we adopted the centroid method of defuzzification for fuzzy reasoning. There have been reported, however, several methods for defuzzidication. Although the computer-assisted diagnosis obtained from fuzzy reasoning might varies with different defuzzification methods, there were few literatures concerning this subject. Hence, the authors considered other defuzzidcation methods;centroid(Cent), bisector(Bis), middle of maximum(MOM), largest of maximum(LOM)and smallest of maximum(SOM)methods. Diagnostic accuracy, sensivity and specificity acquired from these defuzzifications were compared each other. Consequently, Cent, Bis and MOM are adequate procedures. On the other hand, diagnostic accuracy acquired by LOM or SOM is worse than other procedures. However, sensitivity of LOM and specificity of SOM are better than others. Therefore, these methods are useful when sensitivity or specificity is clinically important.

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