• Acta Optica Sinica
  • Vol. 41, Issue 16, 1611003 (2021)
Zhenzhen Pi1, Haijun Yu2、3, Lei Li1, Zhongjian Tian1, and Fenglin Liu1、2、3、*
Author Affiliations
  • 1State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
  • 2Key Laboratory of Optoelectronic Technology and Systems, 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
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    DOI: 10.3788/AOS202141.1611003 Cite this Article Set citation alerts
    Zhenzhen Pi, Haijun Yu, Lei Li, Zhongjian Tian, Fenglin Liu. Triple-Source Swinging Spiral CT Imaging Method for Security Inspection[J]. Acta Optica Sinica, 2021, 41(16): 1611003 Copy Citation Text show less
    Schematic of TS-SCT. (a) Scanning trace lines; (b) geometric model in xoy plane
    Fig. 1. Schematic of TS-SCT. (a) Scanning trace lines; (b) geometric model in xoy plane
    Motion trajectories of X-ray source in different CT structures. (a) Motion trajectory of single-source spiral CT; (b) expanded view of moving track of single X-ray source in TS-SCT
    Fig. 2. Motion trajectories of X-ray source in different CT structures. (a) Motion trajectory of single-source spiral CT; (b) expanded view of moving track of single X-ray source in TS-SCT
    Geometric model of cone-beam spiral CT in z-direction. (a) p=T; (b) p>T
    Fig. 3. Geometric model of cone-beam spiral CT in z-direction. (a) p=T; (b) p>T
    Structural diagram of TS-SCT scanning
    Fig. 4. Structural diagram of TS-SCT scanning
    Structural diagram of TS-SCT system
    Fig. 5. Structural diagram of TS-SCT system
    Luggage phantom
    Fig. 6. Luggage phantom
    Reconstructed results from simulation experiment. (a) 128th layer original image of phantom in z-direction; 128th layer reconstructed images in z-direction for r of (b) 1/4, (c) 1/2, (d) 3/4, and (e) 1; (f) 154th layer original image of phantom in z-direction; 154th layer reconstructed images in z-direction for r of (g) 1/4, (h) 1/2, (i) 3/4, and (j) 1
    Fig. 7. Reconstructed results from simulation experiment. (a) 128th layer original image of phantom in z-direction; 128th layer reconstructed images in z-direction for r of (b) 1/4, (c) 1/2, (d) 3/4, and (e) 1; (f) 154th layer original image of phantom in z-direction; 154th layer reconstructed images in z-direction for r of (g) 1/4, (h) 1/2, (i) 3/4, and (j) 1
    Simulation experiment. (a) Experimental system; (b) photo of test sample
    Fig. 8. Simulation experiment. (a) Experimental system; (b) photo of test sample
    3D reconstructed pseudo-color images. (a) r=1/2; (b) r=5/8; (c) r=1
    Fig. 9. 3D reconstructed pseudo-color images. (a) r=1/2; (b) r=5/8; (c) r=1
    Reconstructed section images. (a)--(c) 150th layer images in z-direction; (d)--(f) 200th layer images in z-direction
    Fig. 10. Reconstructed section images. (a)--(c) 150th layer images in z-direction; (d)--(f) 200th layer images in z-direction
    ParameterValue
    DSD /mm1000
    DSO /mm500
    T /mm80
    Pixel size /(mm×mm)0.8×0.8
    Size of detector array /(pixel×pixel)250×512
    Number of projections per swing300×3
    Size of reconstruction matrix /(pixel×pixel×pixel)256×256×256
    Table 1. Parameters for simulation
    Layer No.rRMSEPSNRSSIM
    1/40.035828.88850.9933
    1281/20.035928.88840.9933
    3/40.036028.88590.9933
    10.042927.35150.9922
    1/40.036128.84760.9933
    1541/20.036128.84660.9933
    3/40.042127.5120.9914
    10.099420.05490.9503
    Table 2. Quantification indexes of reconstructed images in different layers for different r values
    ParameterValue
    Tube voltage /kV150
    Tube current /μA1500
    DSD /mm1000
    DSO /mm500
    Pixel size /(mm×mm)0.8×0.8
    Pitch /mm40
    Source swing times3
    Number of projections per swing300×3
    Size of reconstruction matrix /(pixel×pixel×pixel)512×512×300
    Table 3. Parameters for simulation experiment
    Zhenzhen Pi, Haijun Yu, Lei Li, Zhongjian Tian, Fenglin Liu. Triple-Source Swinging Spiral CT Imaging Method for Security Inspection[J]. Acta Optica Sinica, 2021, 41(16): 1611003
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