Ultra-Low-Dose Spectral CT Based on a Multi-level Wavelet Convolutional Neural Network.
Spectral computed tomography (CT) based on a photon-counting detector (PCD) is a promising technique with the potential to improve lesion detection, tissue characterization, and material decomposition. PCD-based scanners have several technical issues including operation in the step-and-scan mode and...
| Published in: | Journal of Digital Imaging Vol. 34; no. 6; pp. 1359 - 1376 |
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| Main Authors: | , , , |
| Format: | diagnostic images equations & formulas pictorial research tables/charts Journal Article |
| Published: |
Springer Nature
Dec2021
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=154097220&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 154097220 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 08971889 DOQ jtl: Journal of Digital Imaging issn: 08971889 maglogo: N pubinfo: dt: Dec2021 vid: 34 iid: 6 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 154097220 152703095 154097220 154097220 10.1007/s10278-021-00467-w 154097220 ppf: 1359 ppct: 17 formats: fmt: @attributes: type: P tig: atl: Ultra-Low-Dose Spectral CT Based on a Multi-level Wavelet Convolutional Neural Network. aug: au: Lee, Minjae Kim, Hyemi Cho, Hyo-Min Kim, Hee-Joung affil: Department of Radiation Convergence Engineering, Yonsei University, 1 Yonseidae-gil, 26493, Wonju, Republic of Korea sug: subj: Neural Networks (Computer) Tomography, X-Ray Computed Methods Hyperspectral Imaging Methods Human Tomography, X-Ray Computed Evaluation Comparative Studies Simulations Radiographic Image Enhancement ab: Spectral computed tomography (CT) based on a photon-counting detector (PCD) is a promising technique with the potential to improve lesion detection, tissue characterization, and material decomposition. PCD-based scanners have several technical issues including operation in the step-and-scan mode and long data acquisition time. One straightforward solution to these issues is to reduce the number of projection views. However, if the projection data are under-sampled or noisy, it would be challenging to produce a correct solution without precise prior information. Recently, deep-learning approaches have demonstrated impressive performance for under-sampled CT reconstruction. In this work, the authors present a multilevel wavelet convolutional neural network (MWCNN) to address the limitations of PCD-based scanners. Data properties of the proposed method in under-sampled spectral CT are analyzed with respect to the proposed deep-running-network-based image reconstruction using two measures: sampling density and data incoherence. This work presents the proposed method and four different methods to restore sparse sampling. We investigate and compare these methods through a simulation and real experiments. In addition, data properties are quantitatively analyzed and compared for the effect of sparse sampling on the image quality. Our results indicate that both sampling density and data incoherence affect the image quality in the studied methods. Among the different methods, the proposed MWCNN shows promising results. Our method shows the highest performance in terms of various evaluation parameters such as the structural similarity, root mean square error, and resolution. Based on the results of imaging and quantitative evaluation, this study confirms that the proposed deep-running network structure shows excellent image reconstruction in sparse-view PCD-based CT. These results demonstrate the feasibility of sparse-view PCD-based CT using the MWCNN. The advantage of sparse view CT is that it can significantly reduce the radiation dose and obtain images with several energy bands by fusing PCDs. These results indicate that the MWCNN possesses great potential for sparse-view PCD-based CT. pubtype: Academic Journal doctype: diagnostic images equations & formulas pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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