Effectiveness of Ultrasonic Examination Using a Still Image Recording System in Mass Screening for Breast Cancer
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概要
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We have been conducting mass screening tests for breast cancer using physical examination combined with ultrasonic examination in Tochigi prefecture since 1987. In this article we describe the system and discuss the efficacy of ultrasonic examination using a still image recording system, which was begun in 1992.<BR>This system involves examination by physicians, followed by ultrasonic examination, which laboratory technicians perform by request based on the result of the physical examination. The ultrasonic image, input to a digital optical-magnet disk, is then forwarded to specialists for interpretation. Persons requiring a more detailed examination are then picked out.<BR>The number of persons investigated over the last six years has been 105, 845. Seventy subjects with breast cancer were found, giving a ratio of 0.07%. The ratio of individuals requiring more detailed examination was as low as 2.1% on average, due to the "squeezing" effect of the ultrasonic examination ; the figure was 1.7% in 1993. Moreover, the ratio of early-stage breast cancer was 46.4% among all cases it was as high as 73.3% for consecutive follow-up on a yearly basis.<BR>The receiver-operating characteristic (ROC) curve for this system was obtained using the results of diagnostic ultrasonography and a questionnaire for more detailed examination. The curve characteristic was good and it was suggested by a further downward shift in the ratio of those requiring more detailed examination that relatively good examination sensitivity was maintained.<BR>It was shown that this screening system, combining physical examination for the presence of a mass with ultrasonic examination for qualitative diagnosis, was efficacious in spite of the relatively small facility and the number of staff.<BR>
- 日本乳癌検診学会の論文
日本乳癌検診学会 | 論文
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