학술논문
Comparison of Reconstructed Images using CT Filters
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- 영문명
- 발행기관
- 한국방사선학회
- 저자명
- 손정민 천권수
- 간행물 정보
- 『한국방사선학회 학술대회 논문집』한국방사선학회 2017년 추계종합학술대회논문집, 42~42쪽, 전체 1쪽
- 주제분류
- 공학 > 기타공학
- 파일형태
- 발행일자
- 2017.11.10
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국문 초록
전산화단층촬영(Computed Tomography)은 인체 내부를 투과한 투영 데이터를 컴퓨터로 재구성하여 단층 영상을 만들어 내는 기술이다. 영상재구성방법 중 필터보정역투영법(Filtered Back Projection)이 대표적으로 사용된다. 필터보정역투영법은 단순 역투영(Back Projection)의 영상에 잔류하는 Blur(각 픽셀의 값을 주변 값의 평균으로 계산하여 영상이 흐려짐)와 같은 결함을 해결하기 위해 영상을 고속푸리에 변환(FFT, Fast Fourier Transform)하여 주파수영역으로 바꿔준 후 Blur처리가 될 영역을 필터로 보정한다. 필터의 잡음 성능을 개선하기 위해 사용되는 필터는 Ram-Lak, Shepp-Logan, Hamming, Hann, Cosine 등이 있으며 각각의 필터 중 고역 필터(High Pass Filter)는 Ram-Lak, Shepp-Logan 필터가 있으며 저역 필터(Low Pass Filter)는 Cosine 필터와 Hamming 필터가 사용된다.
본 논문은 Visual C++을 이용한 MFC로 영상재구성에 사용되는 5가지 필터를 사용하여 512 × 512 영상을 재구성 하고 대조도와 크기가 다른 팬텀(Circle Phantom)을 복원해 원래의 영상과 복원한 재구성영상의 차이를 비교하였다.
영문 초록
목차
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