Research on Image Analysis Method of Spectral CT Based on Principal Component Analysis

DI Yunxia; KONG Huihua; NIU Xiaowei

doi:10.15953/j.ctta.2022.077

Volume 31 Issue 6

Nov. 2022

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CT Theory and Applications > 2022 > 31(6): 749-760. > DOI: 10.15953/j.ctta.2022.077

DI Y X, KONG H H, NIU X W. Research on image analysis method of spectral CT based on principal component analysis[J]. CT Theory and Applications, 2022, 31(6): 749-760. DOI: 10.15953/j.ctta.2022.077. (in Chinese).

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Research on Image Analysis Method of Spectral CT Based on Principal Component Analysis

DI Yunxia^{1, 2,},
KONG Huihua^{1, 2, ,},
NIU Xiaowei^{1, 2}

1.
School of Mathematics, North University of China, Taiyuan 030051, China
2.
Shanxi Key Laboratory of Signal Capturing & Processing, North University of China, Taiyuan 030051, China

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Received Date: May 03, 2022
Accepted Date: June 24, 2022
Available Online: July 05, 2022
Published Date: November 02, 2022

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Abstract

Abstract

Spectral computed tomography (CT) based on photon counting detector can simultaneously collect projection data of multiple spectral channels and obtain absorption characteristics of material within corresponding energy ranges, so it can be effectively applied to material identification and material decomposition. Principal component analysis is an excellent multivariate analysis technique, which can be applied to process multi-energy spectral CT data. In this paper, principal component analysis was performed on spectral CT data in projection domain and image domain respectively, and the analysis results were compared systematically. Meanwhile, in order to reduce the influence of noise and improve the color characterization performance of spectral CT images, the method of combining double domain filtering with pixel value square was proposed to denoise the noisy principal component images, and then the selected principal component images were mapped to RGB color channels. The experimental results demonstrate that the principal component analysis can obtain clear CT images and identify the different components of the substance, whether in the projection domain or the image domain. However, compared with the principal component analysis method in the image domain, principal component analysis in the projection domain can retain more details of the substance and acquire clearer color CT images.
- spectral CT,
- principal component analysis,
- material discrimination,
- projection domain,
- image domain

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