著者

小田 純一 Oda Jun-ichi

出版者

新潟医学会

雑誌

新潟医学会雑誌 (ISSN:00290440)

巻号頁・発行日

vol.109, no.7, pp.315-319, 1995-07

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The photofluoloscopic examination is widely used in Japan for mass screening of lung cancer. But efficacy of mass screening used this method is not sufficient for improve the survival rate of the screened population. So, recently new radiological modalities are proposed for improve the efficacy of mass screening. We tried to evaluate the effectiveness of some of these new modalities, Computed Tomography (CT) and Computed Radiography with energy subtraction method (CR-ES). We used these two new modalities to the outpatients of our department who were detected by mass screening for lung cancer in Niigata City. In the first place, we compared CT with conventional radiography (CONV). These two examinations were done to the 342 outpatients at the same day in the last four years, and 334 abnormal lesions were found out by CT. Among these lesions checked by CT, 234 lesions (70 %) were detected by CONV. As a result, we concluded that if using CT for mass screening, the detectability of abnormal lesions will be improved at least 30 % than now. Next, we compared CR-ES with CONV. These two examinations and CT were done to the 36 outpatients in a last half year, and 43 abnormal lesions were detected by CT. Thirty-one of these 43 lesions (72 %) were detected by CR-ES, and twenty-six (60 %) by CONV. So, we concluded that if using CR-ES for mass screening, the detectability will be improved about 10 % than now.