Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)
- Volume 31 Issue 1
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- Pages.71-81
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- 2008
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- 2288-3509(pISSN)
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- 2384-1168(eISSN)
Evaluation to Obtain the Image According to the Spatial Domain Filtering of Various Convolution Kernels in the Multi-Detector Row Computed Tomography
MDCT에서의 Convolution Kernel 종류에 따른 공간 영역 필터링의 영상 평가
- Lee, Hoo-Min (Department of Radiologic Technology, Dongnam Health College) ;
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Yoo, Beong-Gyu
(Department of Radiologic Technology, Wonkwang Health Science College) ;
- Kweon, Dae-Cheol (Department of Radiology, Seoul National University Hospital)
- Published : 2008.03.31
Abstract
Our objective was to evaluate the image of spatial domain filtering as an alternative to additional image reconstruction using different kernels in MDCT. Derived from thin collimated source images were generated using water phantom and abdomen B10(very smooth), B20(smooth), B30(medium smooth), B40 (medium), B50(medium sharp), B60(sharp), B70(very sharp) and B80(ultra sharp) kernels. MTF and spatial resolution measured with various convolution kernels. Quantitative CT attenuation coefficient and noise measurements provided comparable HU(Hounsfield) units in this respect. CT attenuation coefficient(mean HU) values in the water were values in the water were
CT 영상은 커널의 종류와 재구성 방법에 따라 다양하게 나타나며, 관심 영역의 CT감약계수 및 노이즈는 정밀도에 영향을 준다. 커널의 종류에 따른 노이즈, 공간분해능 및 MTF를 측정하여 영상을 평가하였다. 다중채널CT 스캐너를 이용하여 팬텀 및 복부를 스캔 하였고, 커널은 B10(very smooth), B20(smooth), B30(medium smooth), B40(medium), B50(medium sharp), B60(sharp), B70(very sharp), B80(ultra sharp)으로 재구성하여 물, 공기, 간의 실질 조직, 근육, 지방 부위를 ROI 기능을 이용하여 평균의 CT감약계수와 표준편차인 노이즈를 정량적으로 측정하여 영상을 비교하였다. 그 결과CT 감약계수는 물(
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