Local Accelerator CT Testing of Large-Diameter Rotary Part Shells

Meina Zhan; Song Ni; Haijun Yu; Haixia Xie; Fenglin Liu; Hui Tan

doi:10.3788/AOS241179

Journals >Acta Optica Sinica >Volume 44 >Issue 22 >Page 2211003 > Article

Acta Optica Sinica
Vol. 44, Issue 22, 2211003 (2024)

Local Accelerator CT Testing of Large-Diameter Rotary Part Shells

Meina Zhan^1,2, Song Ni¹, Haijun Yu^1,2, Haixia Xie^1,2..., Fenglin Liu^1,2 and Hui Tan^1,2,*|Show fewer author(s)

Author Affiliations

¹Industrial CT Non-Destructive Testing Engineering Research Center, Ministry of Education, Chongqing University, Chongqing 400044, China

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

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DOI: 10.3788/AOS241179 Cite this Article Set citation alerts

Meina Zhan, Song Ni, Haijun Yu, Haixia Xie, Fenglin Liu, Hui Tan. Local Accelerator CT Testing of Large-Diameter Rotary Part Shells[J]. Acta Optica Sinica, 2024, 44(22): 2211003 Copy Citation Text

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Fig. 1. Schematic diagrams of mL-STCT geometric models. (a) Three-dimensional geometric model; (b) two-dimensional geometric model

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Fig. 2. Two-dimensional geometric model under new coordinate system

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Fig. 3. Projection data distributions of mL-STCT. (a) Single scanning; (b) discontinuous projection; (c) continuous projection

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Fig. 4. Simulation phantom and local magnification image. (a) Simulation phantom; (b) local magnification image

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Fig. 5. Reconstruction results of different projection data distributions. (a)‒(d) Reconstruction results of case1; (e)‒(h) reconstruction results of case2; (i)‒(l) reconstruction results of case3

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Fig. 6. Magnified ROIs in Fig. 5. (a)‒(d) case1; (e)‒(h) case2; (i)‒(l) case3

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Fig. 7. Reconstruction results of different imaging methods. (a) Phantom; (b)‒(e) reconstruction results; (f)‒(j) magnified ROIs in Figs. 7(a)‒(e)

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Fig. 8. Profiles along the 26^th and 44^th rows of reconstruction images of different imaging methods. (a) Profiles along the 26^th row; (b) profiles along the 44^th row

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Fig. 9. Projection data distributions of different imaging methods. (a) mL-STCT; (b) TCT

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Fig. 10. Experimental system of mL-STCT

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Fig. 11. Reconstruction results of mL-STCT for different scanning times. (a)‒(d) Reconstruction results; (e)‒(h) magnified ROIs in Figs. 11(a)‒(d)

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Fig. 12. Reconstruction results of different imaging methods. (a)‒(d) Reconstruction results; (e)‒(h) magnified ROIs in Figs. 12(a)‒(d)

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Fig. 13. Scanning schematic and reconstruction result of resolution test card. (a) Scanning schematic; (b) reconstruction result

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Fig. 14. Reconstruction results of strip defects of different widths. (a) Width is 0.6 mm; (b) width is 1.2 mm; (c) width is 2 mm

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Parameter	Value
Distance from source to object l /mm	1493
Distance from detector to object h /mm	764
Model radius R /mm	700
Source translation distance 2s /mm	800
Detector array number	2048
Detector pixel size /mm	0.2
Number of scans T	5
Critical rotation angle per scan θ_C /(°)	0, 25.8, -27.4, 44.5, -49.8
Offset distance per scan D_t /mm	700, 630.2, 621.5, 499.3, 451.8
Field of view /mm	138.4

Table 1. Parameters of simulation

t	2	3	4	5
case1	35.8	-37.4	64.5	-69.8
case2	30.8	-32.4	54.5	-59.8
case3	25.8	-27.4	44.5	-49.8

Table 2. Rotation angle of object per scan under different projection distributions

T	RMSE of case1	IFC of case1	SSIM of case1	RMSE of case2	IFC of case2	SSIM of case2	RMSE of case3	IFC of case3	SSIM of case3
2	0.8604	1.4113	0.6602	0.8556	1.4421	0.6689	0.8517	1.5384	0.7028
3	0.8264	1.4936	0.6498	0.8323	1.6208	0.6641	0.8336	1.8302	0.7267
4	0.8225	1.5430	0.6572	0.8273	1.6917	0.6727	0.8279	1.9560	0.7378
5	0.8157	1.6808	0.6832	0.8269	1.8733	0.6994	0.8251	2.1915	0.7568

Table 3. Reconstruction image indexes under different projection distributions

Method	L-STCT	TCT	mL-STCT（T=3）	mL-STCT（T=5）
RMSE	0.9046	0.8362	0.8731	0.8251
IFC	1.3701	1.7455	1.4190	2.1915
SSIM	0.6825	0.7243	0.6502	0.7568

Table 4. Reconstruction image indexes of different imaging methods

Parameter	Simulated physical scanning experiment value	Simulated parameter value
Distance from source to object l /mm	196	1493
Distance from detector to object h /mm	107	764
Sample radius R /mm	86.3	700
Source translation distance 2s /mm	98.6	800
Detector array number	398	2048
Detector pixel size /mm	0.127	0.200
Number of scans T	5	5
Critical rotation angle per scan θ_C /(°)	0, 25.8, -27.4, 44.5, -49.8	0, 25.8, -27.4, 44.5, -49.8
Offset distance per scan D_t /mm	80, 72, 71, 57, 51.6	700, 630.2, 621.5, 499.3, 451.8
Field of view /mm	15.5	138.4
Tube voltage /kV	100	—
Tube current /μA	100	—

Table 5. Parameters of simulated physical scanning experiment

Meina Zhan, Song Ni, Haijun Yu, Haixia Xie, Fenglin Liu, Hui Tan. Local Accelerator CT Testing of Large-Diameter Rotary Part Shells[J]. Acta Optica Sinica, 2024, 44(22): 2211003

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