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학술지 Geometric calibration of a computed laminography system for high-magnification nondestructive test imaging
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저자
채승훈, 손기홍, 이수열
발행일
202210
출처
ETRI Journal, v.44 no.5, pp.816-825
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.2021-0136
협약과제
21IR2800, 3D Navigation 융합형 저선량 C-Arm CT 시스템 개발, 이수열
초록
Nondestructive testing, which can monitor a product's interior without disassembly, is becoming increasingly essential for industrial inspection. Computed laminography (CL) is widely used in this application, as it can reconstruct a product, such as a printed circuit board, into a three-dimensional (3D) high-magnification image using X-rays. However, such high-magnification scanning environments can be affected by minute vibrations of the CL device, which can generate motion artifacts in the 3D reconstructed image. Since such vibrations are irregular, geometric corrections must be performed at every scan. In this paper, we propose a geometry calibration method that can correct the geometric information of CL scans based on the image without using geometry calibration phantoms. The proposed method compares the projection and digitally reconstructed radiography images to measure the geometric error. To validate the proposed method, we used both numerical phantom images at various magnifications and images obtained from real industrial CL equipment. The experiment results confirmed that sharpness and contrast-to-noise ratio (CNR) were improved.
KSP 제안 키워드
Calibration method, Digitally Reconstructed Radiography, Experiment results, Geometric error, Motion artifact, Nondestructive testing, Three dimensional(3D), carrier-to-noise ratio(CNR), geometric calibration, geometric correction, geometric information
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