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KMID : 1001220070090010021
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Journal of the Korean Society of Digital Medical Imaging Technology
2007 Volume.9 No. 1 p.21 ~ p.30
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A Method to Obtain the CT Attenuation Coefficient and Image Noise of Various Convolution Kernels in the Computed Tomography
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Kwon Dae-Chul
Yoo Byung-Gu
Lee Jong-Suk
Jang Keun-Jo
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Abstract
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Our objective was to evaluate the CT attenuation coefficient and noise of spatial domain filtering as an alternative to additional image reconstruction using different kernels in abdominal CT. Derived from thin collimated source images was generated using abdomen B10 (very smooth), B20 (smooth), B30 (medium smooth), B40 (medium), B50 (medium sharp), B60 (sharp), B70 (very sharp) and B80 (ultra sharp) kernels. Quantitative CT coefficient and noise measurements provided comparable HU (hounsfield) units in this respect. CT attenuation coefficient (mean HU) values in the abdominal were 60.4~62.2 HU and noise (7.6~63.8 HU)in the liver parenchyma. In the stomach a mean (CT attenuation coefficient) of -2.2~0.8 HU and noise (10.1~82.4 HU) was measured. Image reconstructed with a convolution kernel led to an increase in noise, whereas the results for CT attenuation coefficient were comparable. Image medications of image sharpness and noise eliminate the need for reconstruction using different kernels in the future. CT images increase the diagnostic accuracy may be controlled by adjusting CT various kernels, which should be adjusted to take into account the kernels of the CT undergoing the examination.
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KEYWORD
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Kernel, CT Coefficient, Noise, Computed Tomography
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