Evaluation of Image Quality of Breast Phantom Radiographs by Fuzzy Measure Model -A Proposition on Quality Control of Mammographic System

概要

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The purpose of this work presents a method of subjective evaluation for radiographs of RMI -Breast Phantom [Model 156] by using the fuzzy measure model. Furthermore, we also examied the Quality Control (QC) method by using the standard value based on the mammography guideline. For this purpose, a fuzzy measure model which is one of fuzzy theory and a fuzzy integral applying the fuzzy measure were adopted.<BR>We produced three breast phantom radiographs from each of the three screen - film systems respectively, and carried out an examination by eight observers. The observers evaluated the limit of sight for each sham shadow, and gave an evaluation value on the basis of the method of score summation. With the total score average (the average of evaluation value for image quality factor) and the fuzzy measure allocated for each image quality factor, the fuzzy integral is calculated to determine the total evaluation value (fuzzy integral value) of breast phantom radiographs. Fuzzy measure was determined as the contribution ratio of the image quality factor regarding the precision of the breast radiograph by film readers. It was concluded that evaluation of image quality for breast phantom radiographs by using the fuzzy measure based on the fuzzy measure model and its fuzzy integral became possible, and a method for QC was proposed.
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