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NTIS 바로가기한국방사선학회 논문지 = Journal of the Korean Society of Radiology, v.13 no.2, 2019년, pp.159 - 168
이상헌 (동의대학교 대학원 보건의과학과) , 이효영 (동의대학교 대학원 보건의과학과)
We examined the effect of Siemens ADMIRE (Advanced Modeled Iterative Reconstruction) on image quality by measuring changes in HU, noise, and SNR of background air, fat, muscle, and background signals on a chest CT scan. Experimental results show that as the ADMIRE Strength increases, the noise decre...
핵심어 | 질문 | 논문에서 추출한 답변 |
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ADMIRE Strength가 커질수록 나타나는 현상은 무엇인가? | 흉부 CT스캔에서 공기, 지방, 근육, Background의 HU, 잡음 그리고 신호 대 잡음비의 변화를 측정해 영상 화질에 미치는 지멘스 ADMIRE(Advanced Modeled Iterative Reconstruction)의 영향을 조사했다. 실험 결과에 따르면 ADMIRE Strength가 커질수록 잡음은 감소하고 신호는 증가하여, 결론적으로 신호 대 잡음비는 증가하는 것으로 나타났다. ADMIRE는 기존 영상 재구성 알고리즘인 FBP와 비교하여 잡음을 28~61%까지 줄일 수 있으며, 신호 대 잡음비는 16~100%까지 향상시킨다. | |
필터보정 역 투영법(filtered back projection, FBP)의 특징은 무엇인가? | 필터보정 역 투영법(filtered back projection, FBP)은 CT에서 영상 재구성의 표준 알고리즘이었지만, 줄무늬 인공물(streak artifact)을 생성하고 낮은 선량에서 영상의 잡음(noise)이 현저하게 증가하는 단점이 있다.[1] 최근 컴퓨터 기술의 진보로 영상의 인공물(artifact) 및 잡음을 줄이는 목적으로 고안된 반복적 재구성법(Iterative Reconstruction, IR)이 임상에 적용되었다. | |
반복적 재구성법(Iterative Reconstruction, IR)의 정의와 기대효과는 무엇인가? | [1] 최근 컴퓨터 기술의 진보로 영상의 인공물(artifact) 및 잡음을 줄이는 목적으로 고안된 반복적 재구성법(Iterative Reconstruction, IR)이 임상에 적용되었다. 이 재구성 방법은 data를 한 번만 처리하는 FBP와 달리 영상의 잡음을 줄이기 위해 raw dada 또는 reconstructed data를 반복적으로 처리하는데 사용되는 알고리즘(algorithm)을 총칭하며, 다양한 알고리즘이 임상에 도입되고 있으며 상당한 선량 감소의 가능성을 보여준다.[2] IR은 새로운 것이 아니며 1970년대 CT 도입 초기에 데이터 재구성을 위해 처음 제안된 방법이었으나, CT의 많은 양의 데이터와 수학적으로 계산해 낼 수 있는 기술의 한계로 임상에 적용할 수 없었다. |
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