X線骨盤計測撮影による胎児リスクの推定

概要

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X-ray pelvimetric examinations are carried out for the purpose of diagnosing the cephalo pelvic disproportion at terminal pregnancy and they are still an excellent method, being performed more often than other examinations. However the invitable fetal exposure is considered to be a significant dose and makes an estimation of stochastic fetal risk related to X-ray exposure and to investigate the methods of dose reduction. As the methods judging the exposure dose actually made in the hospitals, a questionnarie regarding the main technical factors of an X-ray examination was given to 26 hospitals, including 5 university hospitals, in Kantou district, and the answeres were analyzed. The estimated risks involving genetics, leukemia and malignant diseases were dependent on the exposure dose which could be calculated on the basis of the technical factors obtained. Total risks on the foetus ranged widely from 1.27×10 rad^<-1> to 1.19×10 rad^<-1>. So for as we have investigated, if all the hospitala used a grid ratio of 5 : 1,a tube voltage of 120 kV, intensitying screens with rare earth phosphors and green-sensitive orthomatic medical X-ray films for the X-ray pelvimetric examinations, it would be possible to reduce the present exposure dose by one-fourth. The ratio of the X-ray pelvimetry taken on pregnant patients ranged from 2% to 33%, having a mean value of 15%.
社団法人日本放射線技術学会の論文
1983-11-01