Fully 3D geometrical calibration for an X-ray grating-based imaging system

Article type: Research Article

Authors: Chen, Mianyi^{a; b} | Yang, Qingsong^b | Cong, Wenxiang^b | Wei, Biao^a | Wang, Ge^{b; *}

Affiliations: [a] Key Laboratory of Optoelectronics Technology and System, Ministry of Education, Chongqing University, Chongqing, China | [b] Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA

Correspondence: [*] Corresponding author: Ge Wang, Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA. Tel.: +1 5186982500; Fax.: +1 5182764233; E-mail: [email protected].

Abstract: The Precision of geometric parameters is the key requirement for grating-based phase-contrast CT and attenuation-based CT in cone-beam geometry. By extending our fan-beam geometric calibration work via Locally Linear Embedding (LLE) into the cone-beam case, here we calibrate the geometric parameters of our in-house phase-contrast CT system with attenuation projection data. Numerical and experimental studies show that the LLE-based calibration method is feasible to calibrate 8 parameters of the cone-beam geometry that improves reconstruction quality significantly.

Keywords: Geometric calibration, cone-beam, locally linear embedding, phase-contrast CT

DOI: 10.3233/XST-160590

Journal: Journal of X-Ray Science and Technology, vol. 24, no. 6, pp. 821-836, 2016