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자동노출조절장치를 이용한 흉부 방사선검사 시 갑상샘 장기선량 최소화를 위한 새로운 차폐 방법에 관한 연구

A Study on New Shielding Method for Minimizing Thyroid Oran Dose on Chest Radiography Used Automatic Exposure Control

방사선기술과학 2020년 43권 5호 p.323 ~ 329
주영철, 홍동희, 한범희,
소속 상세정보
주영철 ( Joo Young-Cheol ) - Samsung Medical Center Department of Radiology
홍동희 ( Hong Dong-Hee ) - Shinhan University Department of Radiological Science
한범희 ( Han Beom-Hee ) - Radiation Science Technology Laboratory R&D Team

Abstract


The purpose of this study is to investigate the effect of radiation shielding on the thyroid organ dose and image quality during Chest PA examination using automatic exposure control system. This study was conducted in the patient posture and examination conditions such as Chest PA using human model phantom. An experiment without shielding was set as a control group (non) and the cases of using paper coated with a contrast agent (contrast) and bismuth (bismuth) were used as experimental groups. Compared to non-shielded(non), the dose at bismuth increased about 7% in C(cervical vertebrae)5 and C6 and 14% in C7 and contrast showed dose increases of about 17 to 19% in C5 and C6 and about 21% in C7. As a result of the image quality comparison, when measured in the center of the cervical vertebrae, both SNR and CNR in bismuth increased about 40% higher than non, and contrast showed about 8 to 9% improvement. Compared with soft tissues of the cervix, bismuth reduced SNR by about 15% and CNR by about 13%, in contrast, SNR decreased by 11%, and CNR decreased by about 10%. In the Chest PA using AEC, the method of using the shield in front of the collimator has the advantage to observe the anatomical structure of the neck area well compared to the method using the lead. However, the dose at the neck can be increased by 7-21% depending on shielding materials.

키워드

흉부 방사선검사; 갑상샘; 장기선량; 비스무스
Chest radiography; Thyroid; Organ dose; Bismuth

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