I.I. $B4V@\2hA|$N(JROC$B2r@O$K$*$1$kO"B33N?.EYK!$NM-MQ@-(J

Advantage of the method for continuously$B!>(Jdistributed test results in ROC analysis of I.I. fluorographic images

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Summary

We previously reported that ROC analysis by the method for discrete confidence-rating test results (discrete rating method) was effective for evaluating image intensifier (I.I. ) fluorographic images. In the present study, we carried out receiver operating characteristic (ROC) analysis of the I.I. fluorographic images of a gastric area phantom by the method for continuously$B!>(Jdistributed test results (continuous rating method), and investigated the advantages of this new method for evaluation of I.I. fluorographic images.
Sample images of a gastric area phantom were made by four systems which were a combination of different film sensitivities and iris diaphragms. Images were observed by four radiological technologists, and evaluated by both the discrete rating method (5$B!>(Jcategory rating method) and the continuous rating method (100 points maximum). Data obtainta from the two methods were analyzed by ROCFIT for the discrete rating method's data and by LABROC 1 for the continuous rating method's data.
No significant differences were seen in the shape of the ROC curve as well as the area under the ROC curve (Az) between the two methods, but the continuous rating method had a smaller standard deviation of Az among observers in comparison with the discrete rating method.
It was concluded that the method for continuously$B!>(Jdistributed test results can reduce deviation of Az among observers and produce more effective results for ROC analysis of the I.I. fluorographic images compared with the discrete confidence$B!>(Jrating method.

Key words:I.I. fluorographic images, ROC analysis, Method for discrete confidence$B!>(Jrating test results, Method for continuously$B!>(Jdistributed test results, Standard deviation of Az

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