Fully 3D geometrical calibration for an X-ray grating-based imaging system.
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.
Key Laboratory of Optoelectronics Technology and System, Ministry of Education, Chongqing University, Chongqing, China.|Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.
Mianyi
M
Chen
Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.
Qingsong
Q
Yang
Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.
Wenxiang
W
Cong
Key Laboratory of Optoelectronics Technology and System, Ministry of Education, Chongqing University, Chongqing, China.
Biao
B
Wei
Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.
Ge
G
Wang
D002138:Calibration; D003198:Computer Simulation; D054893:Cone-Beam Computed Tomography / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D004867:Equipment Design; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008954:Models, Biological; D019047:Phantoms, Imaging
Geometric calibration; cone-beam; locally linear embedding; phase-contrast CT