Author Affiliations
1State Key Laboratory of Mechanical Transmission, Chongqing University,Chongqing 400044, China2Key Laboratory of Optoelectronic Technology and Systems of the Ministry of Education, Chongqing University, Chongqing 400044, China3Engineering Research Center of Industrial Computed Tomography Nondestructive Testing, Ministry of Education, Chongqing University, Chongqing 400044, China4College of Mathematics and Statistics, Chongqing Technology and Business University, Chongqing 400067, Chinashow less
Fig. 1. Dictionaries used in the experiments. (a) Dictionary of physical phantom; (b) dictionary of turtle; (c) dictionary of chicken feet
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
Fig. 3. Material decomposition results by different algorithms. (a) Bone; (b) soft issue; (c) iodine contrast agent
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
Fig. 5. Material decomposition results by different algorithms. (a) Bone; (b) soft issue; (c) air
Fig. 6. Magnified ROI area. (a) DIMD; (b) TVMD; (c) DLMD; (d) RTVMD; (e) DL-RTV
Fig. 7. Reconstruction results of chicken feet by FBP in high and low energies. (a) High energy reconstruction image; (b) low energy reconstruction image
Fig. 8. Material decomposition results by different algorithms. (a) Bone; (b) soft issue; (c) iodine
Fig. 9. Magnified ROI area. (a) DIMD; (b) TVMD; (c) DLMD; (d) RTVMD; (e) DL-RTV
Input:θ,ε,T,L,K, and other parameters; |
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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, using Eq.(28); | 3Update V using Eq.(29); | 4 End for; | Output:Material images tensor F. |
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Table 1. Flow chart of the DL-RTV solution
Item | Material | Method |
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DIMD | TVMD | DLMD | RTVMD | DL-RTV |
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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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Table 2. Quantitative evaluation results of material decomposition by different algorithms