IJCMBS 2022;2(3):179-84 doi.org/ 10.5281/zenodo.7274510 www.ijcmbs.com THE INTERNATIONAL JOURNAL OF CURRENT MEDICAL AND BIOLOGICAL SCIENCES e-ISSN: 2791-8815 Orgınal Article Breast glandular dose and effectiveness of in-plane bismuth breast shield in routine pediatric female chest CT examination Kız çocuklarında rutin toraks bt çekimlerinde meme glandüler dozu ve bizmut koruyucunun etkinliği Osman Dere 1* , Evrim Ozmen 2 , Yasemin Kayadibi 3 , Fahrettin Kılıc 4 , Ibrahim Adaletli 3 1 Harran University Faculty of Medicine, Department of Radiology, Sanliurfa/ TURKİYE 2 Koç University Hospital, Department of Radiology, İstanbul/ TURKİYE 3 İstanbul University,Cerrahpasa Medical Faculty, Department of Radiology, İstanbul/TURKİYE 4 Acibadem Maslak Hospital, Department of Radiology, İstanbul/TURKİYE Corresponding author: Dr. Osman Dere Adress: Harran University Faculty of Medicine, Department of Radiology,63000 Sanliurfa,TURKİYE E-mail:drderectf@hotmail.com Received:14.07.2022 Accepted:18.10.2022 Cite as: Dere.O, Ozmen.E, Kayadibi.Y, Kılıc.F Adaletli.I Breast glandular dose and effectiveness of in-plane bismuth breast shield in routine pediatric female chest CT examination IJCMBS 2022;2(3):179-84 doi.org/ 10.5281/zenodo.7274510 Abstract Background: The aim of our study is to determine the radiation dose to which the breast is exposed in pediatric female undergoing routine thoracic multislice computed tomography (MSCT) and to investigate the effectiveness of bismuth shielding in reducing this dose. Materials and Methods: Twenty patients who were referred to the radiology department for routine thorax MSCT between January 2012 and April 2012 were included in the study. A Thermolucent dosimeter (TLD) (3x3x1mm; Harshaw Lif TLD-100; Saint-Gobain Industrial Ceramics, Solon, Ohio) was placed on both breast skins of the patients to measure the radiation dose. An in-plane bismuth breast shield was placed on the right breast, and the left breast was chosen as the unshielded side. Radiation doses in the shielded and unshielded breast were calculated and compared using the Paired-t test. Results: The mean radiation doses were calculated as 7.0075 mSv and 9.0730 mSv for the shielded right breast and the unshielded left breast, respectively. It was found that in-plane bismuth breast shielding could lower the radiation dose to the right breast by 22.76 %. The difference between the radiation doses of the shielded side of the breast and the unshieldeded side was found to be significant (p<0.001). No deterioration was detected in the image quality of the lung parenchyma on the side where bismuth shield was placed.Conclusions: In-plane bismuth shielding significantly reduces the radiation dose of the breast in pediatric female undergoing routine thoracic MSCT examination without impairing the image quality. Keywords: Bismuth shield, breast shield, pediatric female, multislice computed tomography ÖZ Amaç: Çalışmamızın amacı rutin toraks çok kesitli bilgisayarlı tomografi (ÇKBT) çekilen kız çocuklarında memenin maruz kaldığı radyasyon dozunu belirlemek ve bizmut koruyucunun bu dozu azaltmadaki etkinliğini araştırmaktır.Materyal ve metod: Çalışmaya Ocak 2012- Nisan 2012 tarihleri arasında radyoloji bölümüne rutin toraks ÇKBT çekimi için yönlendirilen 20 hasta dahil edildi. Hastaların her iki meme cildine radyasyon dozunu ölçmek amacıyla birer adet Termolusent dozimetre (TLD) (3x3x1mm; Harshaw Lif TLD-100;Saint-Gobain İndustrial Ceramics, Solon, Ohio) yerleştirildi. Sağ memenin üzerine bizmut koruyucu yerleştirilmiş olup, sol meme korunmamış taraf olarak seçildi. Bu teknikle yüzeyel meme radyasyon dozu hesaplandı. Korunan ve korunmayan memedeki radyasyon dozları hesaplandı ve Paired-t test kullanılarak karşılaştırıldı. Bulgular: Ortalama radyasyon dozları korunan sağ meme ve korunmayan sol meme için sırasıyla 7.0075 mSv ve 9.0730 mSv olarak hesaplandı. Bizmut koruyucunun sağ memenin maruz kaldığı radyasyon dozunu %22.76 oranında azaltabileceği görüldü. Memenin korunan tarafı ile korunmayan tarafının maruz kaldığı radyasyon dozları arasındaki fark anlamlı bulundu (p<0.001). Bizmut koruyucu yerleştirilen tarafta akciğer parankiminin görüntü kalitesinde herhangi bir bozulma saptanmadı. Sonuç: Bizmut koruyucu rutin toraks ÇKBT incelemesi yapılan kız çocuklarında görüntü kalitesini bozmadan memenin maruz kaldığı radyasyon dozunu belirgin miktarda azaltmaktadır. Anahtar Kelimeler: Bizmut koruyucu, meme koruyucu, kız çocuğu, çok kesitli bilgisayarlı tomografi Highlights • Breast tissue exposed to radiation from MSCT of the chest is an area of particular concern in pediatric female. • In-plane bismuth breast shielding offers an additional method of decreasing dose to female pediatric patients undergoing MDCT.