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KMID : 0880420210220010086
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Korean Journal of Radiology
2021 Volume.22 No. 1 p.86 ~ p.96
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Spectral Computed Tomography: Fundamental Principles and Recent Developments
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So Aaron
Nicolaou Savvas
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Abstract
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CT is a diagnostic tool with many clinical applications. The CT voxel intensity is related to the magnitude of X-ray attenuation, which is not unique to a given material. Substances with different chemical compositions can be represented by similar voxel intensities, making the classification of different tissue types challenging. Compared to the conventional single-energy CT, spectral CT is an emerging technology offering superior material differentiation, which is achieved using the energy dependence of X-ray attenuation in any material. A specific form of spectral CT is dual-energy imaging, in which an additional X-ray attenuation measurement is obtained at a second X-ray energy. Dual-energy CT has been implemented in clinical settings with great success. This paper reviews the theoretical basis and practical implementation of spectral/dual-energy CT.
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KEYWORD
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X-rays, Computed tomography, Spectral, Dual energy
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