Image-Domain Multimaterial Decomposition for Dual-Energy CT Based on Dictionary Learning and Relative Total Variation

Junru Jiang; Haijun Yu; Changcheng Gong; Fenglin Liu

doi:10.3788/AOS202040.2111004

Acta Optica Sinica, Volume. 40, Issue 21, 2111004(2020)

Image-Domain Multimaterial Decomposition for Dual-Energy CT Based on Dictionary Learning and Relative Total Variation

Junru Jiang^1,2,3, Haijun Yu^2,3, Changcheng Gong⁴, and Fenglin Liu^2,3、*

Author Affiliations

¹State Key Laboratory of Mechanical Transmission, Chongqing University,Chongqing 400044, China

²Key Laboratory of Optoelectronic Technology and Systems of the Ministry of Education, Chongqing University, Chongqing 400044, China

³Engineering Research Center of Industrial Computed Tomography Nondestructive Testing, Ministry of Education, Chongqing University, Chongqing 400044, China

⁴College of Mathematics and Statistics, Chongqing Technology and Business University, Chongqing 400067, China

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Figures & Tables(11)

Fig. 1. Dictionaries used in the experiments. (a) Dictionary of physical phantom; (b) dictionary of turtle; (c) dictionary of chicken feet

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Fig. 2. Reconstruction results of mouse thorax phantom by SIRT in high and low energies. (a) High energy reconstruction image; (b) low energy reconstruction image

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Fig. 3. Material decomposition results by different algorithms. (a) Bone; (b) soft issue; (c) iodine contrast agent

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Fig. 4. Reconstruction results of partial turtle projection by PISSC in high and low energies. (a) High energy reconstruction image; (b) low energy reconstruction image

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Fig. 5. Material decomposition results by different algorithms. (a) Bone; (b) soft issue; (c) air

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Fig. 6. Magnified ROI area. (a) DIMD; (b) TVMD; (c) DLMD; (d) RTVMD; (e) DL-RTV

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Fig. 7. Reconstruction results of chicken feet by FBP in high and low energies. (a) High energy reconstruction image; (b) low energy reconstruction image

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Fig. 8. Material decomposition results by different algorithms. (a) Bone; (b) soft issue; (c) iodine

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Fig. 9. Magnified ROI area. (a) DIMD; (b) TVMD; (c) DLMD; (d) RTVMD; (e) DL-RTV

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Table 1. Flow chart of the DL-RTV solution

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Table 1. Flow chart of the DL-RTV solution

Input:θ,ε,T,L,K, and other parameters;
Initialization:F⁽⁰⁾=0,V⁽⁰⁾=0,J⁽⁰⁾=0,k=0。
Step1:Train dictionary
1 Reconstruct dual-energy CT images;
2 Acquire original material images using the DIMD;
3 Train a dictionary employing the K-SVD method.
Step2:Decompose materials
0 For k=1:Kdo
1 Update F⁽^k⁺¹⁾ using Eq.(24);
2 Update J, ${α_{m}}_{m = 1}^{M}$ using Eq.(28);
3Update V using Eq.(29);
4 End for;
Output:Material images tensor F.

Table 2. Quantitative evaluation results of material decomposition by different algorithms

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Table 2. Quantitative evaluation results of material decomposition by different algorithms

Item	Material	Method
Item	Material	DIMD	TVMD	DLMD	RTVMD	DL-RTV
RMSE	Bone	0.0345	0.0460	0.0313	0.0337	0.0304
	Soft issue issue	0.1256	0.0975	0.0909	0.0957	0.0854
	I	0.0952	0.0655	0.0687	0.0444	0.0592
PSNR	Bone	29.243	26.752	30.103	29.437	30.353
	Soft issue issue	18.023	20.224	20.826	20.382	21.375
	I	20.430	23.678	23.256	27.057	24.555
SSIM	Bone	0.9612	0.9716	0.9822	0.9855	0.9855
	Soft issue issue	0.7228	0.9193	0.9325	0.9359	0.9364
	I	0.6754	0.9843	0.9755	0.9542	0.9904
FSIM	Bone	0.8860	0.9434	0.9528	0.9534	0.9628
	Soft issue issue	0.6637	0.8822	0.9036	0.8962	0.9040
	I	0.5907	0.9352	0.9312	0.9213	0.9358

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Junru Jiang, Haijun Yu, Changcheng Gong, Fenglin Liu. Image-Domain Multimaterial Decomposition for Dual-Energy CT Based on Dictionary Learning and Relative Total Variation[J]. Acta Optica Sinica, 2020, 40(21): 2111004

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Paper Information

Category: Imaging Systems

Received: May. 27, 2020

Accepted: Jul. 15, 2020

Published Online: Oct. 25, 2020

The Author Email: Liu Fenglin (liufl@cqu.edu.cn)

DOI:10.3788/AOS202040.2111004

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology