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APPARATUS AND METHOD FOR NOISE REDUCTION OF SPECTRAL COMPUTED TOMOGRAPHY IMAGES AND SINOGRAMS USING A WHITENING TRANSFORM
APPARATUS AND METHOD FOR NOISE REDUCTION OF SPECTRAL COMPUTED TOMOGRAPHY IMAGES AND SINOGRAMS USING A WHITENING TRANSFORM
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机译:利用白化变换减少光谱计算机断层扫描图像和正弦图像的噪声的装置和方法
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摘要
A method and apparatus is provided to denoise material-decomposition data generated using projection data from a spectral computed tomography scanner. A whitening transform is used to transform the material-decomposition data into uncorrelated components and perform denoising on the uncorrelated components. Using different denoising parameters for the various uncorrelated components, a flattening can be achieved for the standard deviation of the noise as a function of X-ray energy, which can be determined using mono-energetic images derived from the material-decomposition data. The whitening transformation and the denoising can be applied the material-decomposition sinograms and/or to material-decomposition images reconstructed from the material-decomposition sinograms.
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