흉부 전산화단층촬영검사를 위한 최적의 저선량 프로토콜에 관한 팬텀연구

• 영문명: A Phantom Study for the Optimal Low-dose Protocol in Chest Computed Tomography Examination
• 발행기관: 대한방사선과학회(구 대한방사선기술학회)
• 저자명: 김영근(Young-Keun Kim) 양숙(Sook Yang) 왕태욱(Tae-uk Wang) 김은혜(Eun-Hye Kim)
• 간행물 정보: 『방사선기술과학』방사선기술과학 제44권 제2호, 101~107쪽, 전체 7쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2021.04.30

영문 초록

The purpose of this study was to evaluate optimal CT scan parameters to minimize patient dose to the irradiation and maintain satisfactory image quality in low-dose chest computed tomography (CT) scans. In a chest anthropomorphic phantom, chest CT scans were performed at different kVp and mA within reference of 3.4mGy in volume CT Dose Index (CTDIvol). The following quantitative parameters had been statistically evaluated: image noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and figure of merit (FOM). Nine radiographers conducted the blind test to select the optimal kVp-mA combination. Results indicated that the kVp-mA combination of 80kVp-90mA, 100kVp-50mA, 120kVp-30mA and 140kVp-30mA were obtained high SNR and CNR. The 120kVp-30mA combination offered good compromise in the FOM, which showed the quality and dose performance. In the blind test, an image of 80kVp-90mA obtained a high score with 4.7 points, and 120kVp-10mA or 140kVp-10mA with a low tube current were observed severe noise and poor image quality, thus resulting in decreased diagnostic accuracy. On the other hand, in the combination of high kVp and high mA(140kVp-90mA), the image quality was improved, but the radiation dose was also increased. the FOM value of 140kVp-90mA was lower than 120kVp-30mA. The application of appropriate scan parameters in low-dose chest CT scans produced satisfactory results in dose and image quality for the accuracy of the clinical diagnosis.

목차

Ⅰ. 서 론

Ⅱ. 대상 및 방법

Ⅲ. 결 과

Ⅳ. 고 찰

Ⅴ. 결 론

키워드

저선량 CT 대조도 대 잡음비 유효선량 성능지수 신호 대 잡음비 Low-dose CT Contrast-to-noise ratio Effective dose Figure of merit Signal-to-noise ratio