부산대학교 도서관

The face guard is located at the height of the head in mammography examination. The purpose of this study is to verify using Monte Carlo simulation how the face guard affects the scattered radiation that the subject can receive when the face guard extends near the compression plate. The target/addition filters were W/Ag and W/Rh, the tube voltage was 30 kV and 35 kV, and the extension length was 20, 30, and 40 cm. As a result, at a tube voltage of 35 kV, it was confirmed that the scattered radiation generated from the breast （phantom） was shielded from 30.7％ to 0.01％ due to the extension of the face guard in the case of the combination of W/Rh in the case of the combination of W/Rh, reducing the exposure. Has been confirmed to be effective. At present, there is no face guard that extends near the breast, but it is suggested that if the face guard extension type proposed by us is implemented, the exposure reduction of the subject will be enhanced.