A correction was developed for a misaligned cone beam computed tomography (CT) system. The cone beam CT system was modeled as a pin-hole camera. A camera imaging model was used to describe the mapping information between the 3D voxels and the 2D projection. This information was integrated into the cone beam CT reconstruction to correct the misaligned cone beam CT image. A computing camera calibration technique was used to build the imaging model. This technique is reliable and accurate. Simulations and real system tests show that this method effectively corrects geometric misalignments during cone beam CT reconstruction.
王梦蛟,丁辉,王广志. 基于相机模型的锥束CT重建误差校正[J]. 清华大学学报（自然科学版）, 2015, 55(1): 122-127.
Mengjiao WANG,Hui DING,Guangzhi WANG. Misaligned cone beam computed tomography reconstruction based on a camera model. Journal of Tsinghua University(Science and Technology), 2015, 55(1): 122-127.
Karolczak M, Schaller S, Engelke K, et al.Implementation of a cone-beam reconstruction algorithm for the single-circle source orbit with embedded misalignment correction using homogeneous coordinates[J]. Medical Physics, 2001, 28(10): 2050-2069.
[2]
Sun Y, Hou Y, Hu J. Reduction of artifacts induced by misaligned geometry in cone-beam CT[J]. IEEE Transactions on Biomedical Engineering, 2007, 54(8): 1461-1471.
[3]
Wiesent K, Barth K, Navab N, et al.Enhanced 3-D-recon-struction algorithm for C-arm systems suitable for interventional procedures[J]. IEEE Transactions on Medical Imaging, 2000, 19(5): 391-403.
[4]
Galigekere R R, Wiesent K, Holdsworth D W. Cone-beam reprojection using projection-matrices[J]. IEEE Transactions on Medical Imaging, 2003, 22(10): 1202-1214.
[5]
Navab N, Bani-Hashemi A, Nadar M S, et al.3D reconstruction from projection matrices in a C-arm based 3D-angiography system [C]// Medical Image Computing and Computer-Assisted Intervention—MICCAI'98. Boston, USA: Medical Image Computing and Computer Assisted Intervention Society, 1998: 119-129
[6]
Navab A, Bani-Hashemi A, Mitshke M, et al.Dynamic geometric calibration for 3-D cerebral angiography [C]// Proceedings of SPIE Medical Imaging. Bellingham, USA: SPIE Medical Imaging, 1996: 361-370
[7]
Anne R, Picard C, Ponchut C, et al.Geometrical calibration of X-ray imaging chains for three-dimensional reconstruction[J]. Computed Medical Imaging and Graphics, 1993, 17(4): 295-300
[8]
Li X, Zhang D, Liu B. A generic geometric calibration method for tomographic imaging systems with flat-panel detectors—A detailed implementation guide[J]. Medical Physics, 2010, 37(7): 3844.
[9]
Wang M, Ding H, Wang G. An improved FDK algorithm using camera calibration technique for misaligned CBCT reconstruction [C]// 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. San Diego, USA: IEEE Engineering in Medicine and Biology Society, 2012: 5991-5994.
[10]
Wang M, Ding H, Wang G. A novel method using camera calibration technique for complete geometric calibration of cone-beam CT [C]// IFMBE Proceedings of World Congress on Medical Physics and Biomedical Engineering. Beijing, China: International Federation for Medical and Biological Engineering, 2013, 842-845
[11]
Feldkamp L A, Davis L C, Kress J W. Practical cone-beam algorithm[J]. Journal of Optics Society of American A, 1984, 1(6): 612-619.
[12]
Abdel-Aziz Y I, Karara H M. Direct linear transformation into object space coordinates in close-range photogrammetry [C]// Proceedings of the Symposium on Close-Range Photo-grammetry. Chicago, USA: University of Illinois at Urbana-Champaign, 1971: 1-18.
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