1. Hengyong Yu， Yong Wang， Ping Wang， Xuanqin Mou and Yuanlong Cai；A new face detection model；Proceedings of ICIG2000，pp574-577, August 16-18, 2000, Tianjin, China. 
  2. Hengyong Yu, Yong Wang and Xuanqin Mou; Face detection model based on distance measure of regional feature; 2000 5th International Conference on Signal Processing Proceedings, pp1479-1482, August 21~25, 2000, Beijing, China. 
  3. Hengyong Yu, Xuanqin Mou, Yong Wang and Yuanlong Cai；3D reconstruction model of vessel based on object oriented  quantization；Medical Image Acquisition and Processing, Proceedings of SPIE, VOL 4549, pp75-79, Oct 23~24, 2001, Wuhan, China. 
  4. Yong Wang, Xuanqin Mou, Hengyong Yu and Yuanlong Cai；Parametrical model of vessel cross-section reconstruction based on elasticity quality；Medical Image Acquisition and Processing, Proceedings of SPIE, VOL 4549: pp80-85, Oct 23-24, 2001, Wuhan, China. 
  5. Hengyong Yu, Xuanqin Mou and Yuanlong Cai；Relation between the resolution of reconstructed rotary DSA image and the number of projections；Proceedings of 2001 Annual National Conference on Biomedical Electronics, Biomedical Measurement, Biomedical Information & Control, Biomedical Sensor Techniques, pp316-317, Nov.8-11, 2001, Wuhan, China. 
  6. Xuanqin Mou, Hengyong Yu and Yuanlong Cai；Segment self-guide reconstruction algorithm based on object-oriented quantization, Lecture Notes in Computer Science, vol 2657: 457-465, 2003. 
  7. Jiehua Zhu, Shiying Zhao, Hengyong Yu, Yangbo Ye, Seung Wook Lee and Ge Wang; Numerical studies on Feldkamp-type and Katsevich-type algorithms for cone-beam scanning along nonstandard spirals; Developments in X-Ray Tomography IV, Proceedings of SPIE VOL 5535:558-565, Aug 4-6. 2004, Denver, CO, United States. 
  8. Yangbo Ye, Shiying Zhao, Hengyong Yu and Ge Wang; Exact reconstruction for cone-beam scanning along nonstandard spirals and other curves; Developments in X-Ray Tomography IV, Proceedings of SPIE VOL 5535:293-300, Aug 4-6. 2004. Denver, CO, United States. 
  9. Shiying Zhao, Hengyong Yu and Ge Wang; A family of analytic algorithms for cone-beam CT; Developments in X-Ray Tomography IV, Proceedings of SPIE VOL 5535:318-328, Aug 4-6. 2004, Denver, CO, United States. 
  10. Hengyong Yu, Yangbo Ye and Ge Wang; Katsevich-type algorithms for variable radius spiral cone-beam CT；Developments in X-Ray Tomography IV, Proceedings of SPIE VOL 5535:550-557, Aug 4-6. 2004. Denver, CO, United States. 
  11. Hengyong Yu and Ge Wang; Studies on artifacts of the Katsevich algorithm for spiral cone-beam CT；Developments in X-Ray Tomography IV, Proceedings of SPIE VOL 5535:540-549, Aug 4-6. 2004, Denver, CO, United States. 
  12. Jun Ni, Junjun Deng, Hengyong Yu, Tao He and Ge Wang; Analysis of performance evaluation of parallel Katsevich algorithm for 3-D CT image reconstruction; Proceedings of IMSCCS-2006, volume1, p258-265, June 20-24, Hangzhou, Zhejiang, P.R.China. 
  13. Tao He, Jun Ni, Junjun Deng, Hengyong Yu, and Ge Wang; Deployment of one-sided communication technique for parallel computing in Katsevich CT image reconstruction; Proceedings of IMSCCS-2006, volume 1, p416-423, June 20-24, Hangzhou, Zhejiang, P.R.China. 
  14. Ge Wang, Yangbo Ye, Hengyong Yu; Approximate and exact cone-beam reconstruction with standard and nonstandard spiral scanning; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63180F, 11 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  15. Yangbo Ye, Hengyong Yu, Ge Wang; Skew cone-beam lambda tomography; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63180G, 10 pages,, Aug 15-17, 2006, San Diego, CA, United States. 
  16. Hengyong Yu and Ge Wang; In-plane motion estimation for artifact reduction in fan-beam CT; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181J, 14 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  17. Hengyong Yu, Yangbo Ye and Ge Wang; Image reconstruction via lambda tomography; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181K, 9 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  18. Kai Zeng, Hengyong Yu, Lee L. Fajardo, and Ge Wang; Geometrical study on two tilting arcs based exact cone-beam CT for breast imaging; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181M, 10 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  19. Yuchuan Wei, Hengyong Yu, Jiang Hsieh and Ge Wang; General formulation for x-ray computed tomography; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181N, 9 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  20. Junjun Deng, Hengyong Yu, Jun Ni, Lihe Wang and Ge Wang; Parallelism of iterative CT algorithm based on local reconstruction; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181P, 10 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  21. Hengyong Yu, Yangbo Ye and Ge Wang; Practical cone-beam lambda tomography; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181S, 8 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  22. Shaojie Tang, Hengyong Yu and Xuanqin Mou, Analytic simulation scheme for x-ray projections based on physical model, Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181T, 9 pages,  Aug 15-17, 2006, San Diego, CA, United States. 
  23. Xuanqin Mou, Shaojie Tang and Hengyong Yu; A beam hardening correction method with HL consistency, Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181U, 10 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  24. Xuanqin Mou, Shaojie Tang and Hengyong Yu; Comparison on beam hardening correction of CT-based HL consistency and normal water phantom experiment; Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181V, 12 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  25. Kai Zeng, Hengyong Yu, Michael Grasruck, Bernhard Schmidt and Ge Wang, Experimental evaluation of low-resolution CT regulated tomosynthesis using a flat-panel detector,  Developments in X-Ray Tomography V, Proceedings of SPIE, Vol 6318, Paper id:63181X, 7 pages, Aug 15-17, 2006, San Diego, CA, United States. 
  26. Ge Wang, Wenxiang Cong and Hengyong Yu, Development of x-ray computed tomography and bioluminescence tomography, in Mathematical Methods in Biomedical Imaging and Intensity-modulated Radiation Therapy (IMRT), Pisa, Italy, 2007. 
  27. Xuanqin Mou, Shaojie Tang, Tao Luo, Yizhai Zhang and Hengyong Yu, Beam hardening correction based on HL consistency in polychromatic transmission tomography, Physics of Medical Imaging, Proceedings of SPIE, Vol 6913, Feb. 17-21, 2008, San Diego, CA, United States. 
  28. Hengyong Yu, Yangbo Ye and Ge Wang: Interior tomography: theory, algorithms and applications. Proceedings of SPIE, Vol. 7078, 12 pages, Aug. 2008, San Diego, CA, United States. 
  29. Lena Ye, Hengyong Yu and Ge Wang: Determination of the exact reconstruction region in the cone-beam composite-circling scanning mode; Proceedings of SPIE, Vol. 7078, 11 pages, Aug. 2008, San Diego, CA, United States. 
  30. Ge Wang, Hengyong Yu and Yangbo Ye: Interior omography - - practical applications; Reported at the Huangguoshu International Interdisciplinary Conference on Biomedical Mathematics on Nov. 6, 2008; Chapter 25 in special volume "Biomedical Mathematics: Promising Directions in Imaging, Therapy Planning and Inverse Problems" (Editors: Yair Censor, Ming Jiang and Ge Wang). 
  31. Yangbo Ye, Hengyong Yu and Ge Wang: Interior tomography - - mathematical analysis; Reported at the Huangguoshu International Interdisciplinary Conference on Biomedical Mathematics on Nov. 4, 2008; Chapter 27 in special volume "Biomedical Mathematics: Promising Directions in Imaging, Therapy Planning and Inverse Problems" (Editors: Yair Censor, Ming Jiang and Ge Wang).    
  32. Xi Chen, Xuanqin Mou, Hao Han, Hengyong Yu and Lei Zhang, Scatter correction algorithm without extra exposure for dual-energy digital mammography, Proceedings of SPIE, Vol. 7528, Paper id:725840, Feb. 2009, Orlando, FL, United States. 
  33. Jie Zhang, Hengyong Yu, Curt Corum, Michael Garwood and Ge Wang, Exact and stable interior ROI reconstruction for radial MRI, Proceedings of SPIE, Vol. 7528, Paper id: 72585G, Feb. 2009, Orlando, FL, United States. 
  34. Hengyong Yu, Guohua Cao, Laurel Burk, Yueh Lee, Jianping Lu, Peter Santago, Otto Zhou and Ge Wang; Compressive sampling based interior tomography for dynamic carbon nanotube Micro-CT; 10th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, P. 234-237, Sep. 2009, Beijing, China. 
  35. Yang Lu, Alexander Katsevich, Jun Zhao, Hengyong Yu and Ge Wang; Fast exact/quasi-exact FBP algorithms for triple-source helical cone-beam CT, 10th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, P.238-241, Sep. 2009, Beijing, China. 
  36. Shaojie Tang, Xuanqin Mou, Qiong Xu, Hao Yan, Junfeng Wu, Yanbo Zhang, Hengyong Yu; Noise reduction by projection direction dependent diffusion for low-dose x-ray cone-beam CT; 10th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, P.381-384, Sep. 2009, Beijing, China. 
  37. Deepak Bharkhada, Hengyong Yu, Bruno De Man, Ge Wang; Total variation based cone-beam reconstruction using composite-circling scanning trajectory; 10th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, P.134-137, Sep. 2009, Beijing,  China. 
  38. Junjun Deng, Shikui Yan, Mu Chen, Hengyong Yu, Ge Wang; A study on spiral cone-beam scanning mode for preclinical micro-CT; Nuclear Science Symposium and Medical Imaging Conference Record, p. 3660-3663, Oct. 2009, Orlando, FL, USA. 
  39. Ge Wang, Hengyong Yu, Kriti Sen Sharma, Chris Wyatt, Linbing Wang, Tea Andric, Joseph Freeman, Steve Wang, Michael Feser, SH Lau, Wenbing Yun; Interior reconstruction for multi-scale CT facility; First International Meeting on Image Formation in X-ray Computed Tomography, p. 76-79, June 2010, Salt Lake City, Utah, USA. 
  40. Hengyong Yu and Ge Wang; Soft-threshold filtering approach for reconstruction from a limited number of projections, First International Meeting on Image Formation in X-ray Computed Tomography, p.86-89, June 2010, Salt Lake City, Utah, USA. 
  41. Hengyong Yu, Bruno De Man, and Ge Wang; How to define the next generation cardiac CT architecture, First International Meeting on Image Formation in X-ray Computed Tomography, p. 120-123, June 2010, Salt Lake City, Utah, USA. 
  42. Yangbo Ye, Hengyong Yu and Ge Wang; Gel’fand-Graev’s reconstruction formula in the 3D real space,  First International Meeting on Image Formation in X-ray Computed Tomography, p. 61-64, June 2010, Salt Lake City, Utah, USA. 
  43. Hengyong Yu, Qiong Xu, Xuanqin Mou and Ge Wang; Recent progress in local reconstruction; Proceedings of SPIE, Vol. 7804, Article id:78040V, 13 pages, Aug. 2010, San Diego, CA, United States. 
  44. Qiong Xu, Hengyong Yu, Xuanqin Mou and Ge Wang; Statistical interior tomography; Proceedings of SPIE, Vol. 7804, Article id: 780411, 11 pages, Aug. 2010, San Diego, CA, United States. 
  45. Shaojie Tang, Xuanqin Mou, Qiong Xu and Hengyong Yu, Adaptive beam-hardening correction based on projection data consistency condition, Nuclear Science Symposium and Medical Imaging Conference Record, M09-351, p. 2325-2329, Oct.  2010, Knoxville, TX, USA. 
  46. Qiong Xu, Hengyong Yu, Xuanqin Mou and Ge Wang; Interior tomography from low-count low projections and associated Hilbert transform data, SPIE Medical Imaging Conference, Vol. 7961, Article id: 796130, Feb. 2011, Orlando, FL, United States. 
  47. Shaojie Tang, Xuanqin Mou, Yanbo Zhang and Hengyong Yu; Noise reduction by projection direction dependent diffusion for low dose fan-beam x-ray computed tomography, SPIE Medical Imaging Conference, Vol. 7961, Article id: 79613L, Feb. 2011, Orlando, FL, United States. 
  48. Hao Gao, Hengyong Yu and Ge Wang; True-color CT based on a prior rank, intensity and sparsity model (PRISM); 11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, p.124-127, July 2011, Potsdam, Germany. 
  49. Ge Wang, Erik L Ritman and Hengyong Yu; Big Dipper- The first gating-free dynamic micro-CT system design; 11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, p.156-159, July 2011, Potsdam, Germany. 
  50. Bruno De Man, Paul Fitzgerald, Kai Zeng, Maria Iatrou, Zhengmin Li, James Bennett, Hengyong Yu and Ge Wang; Cardiac CT: Advanced architectures and algorithms; 11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, p.191-194, July 2011, Potsdam, Germany. 
  51. Qiong Xu, Hengyong Yu, Xuanqin Mou and Ge Wang; Dictionary learning based low-dose x-ray CT reconstruction; 11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, p.259-263, July 2011, Potsdam, Germany. 
  52. Hengyong Yu and Ge Wang; Finite detector based projection model for super resolution CT; 11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, p.387-390, July 2011, Potsdam, Germany. 
  53. Chuang Miao, Baodong Liu, Qiong Xu and Hengyong Yu; Comparative studies on distance-driven and finite-detector-based projection models for iterative image reconstruction, 2nd CT Meeting, p.25-28, June 24-27, 2012, Salt Lake City, USA. 
  54. Qiong Xu, Hengyong Yu, James Bennett, Peng He, Rafidah Zainon, Robert Doesburg, Alex Opie, Mike Walsh, Haiou Shen, Anthony Butler, Phillip Butler, Xuanqin Mou, Ge Wang, Image reconstruction from hybrid true-color Micro-CT, 2nd CT Meeting, p.421-424, June 24-27, 2012, Salt Lake City, USA. 
  55. Guohua Cao, Baodong Liu, Hengyong Yu and Ge Wang; A new CT architecture with stationary x-ray sources; Proceedings of SPIE, Vol. 8506, Article id: 850613, 11 pages, Aug. 2012, San Diego, CA, United States.  
  56. Baodong Liu, Ge Wang, Bruno De Man, Elizabeth Krupinski and Hengyong Yu;  An RIP-based evaluation method for candidate next generation cardiac CT architectures with carbon nanotube x-ray source; Proceedings of SPIE, Vol. 8506, Article id: 850610, 13 pages, Aug. 2012, San Diego, CA, United States. 
  57. Hengyong Yu and Ge Wang; Spectrography: Volumetric reconstruction form one or two spectral view; Proceedings of SPIE, Vol. 8506, Article id: 85061Y, 7 pages, Aug. 2012, San Diego, CA, United States. 
  58. Yan Xi, Ge Wang, Hengyong Yu, Yuxin Wang and Jun Zhao; Stereo-imaging towards spectrography for 3D analysis from a single spectral view; Proceedings of SPIE, Vol. 8506, Article id: 85061X, 6 pages, Aug. 2012, San Diego, CA, United States. 
  59. Jiansheng Yang, Hengyong Yu, Wenxiang Cong, Ming Jiang and Ge Wang;  High-order total variation method for interior tomography; Proceedings of SPIE, Vol. 8506, Article id: 85061B, 8 pages, Aug. 2012, San Diego, CA, United States. 
  60. Baodong Liu, Alexander Katsevich and Hengyong Yu; Interior tomography in a curvelet frame; 12th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, p.337-340, June 16-21, 2013. 
  61. Chuang Miao, Ge Wang and Hengyong Yu; Few-view CT reconstruction aided by low-resolution projections; 12th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, p.505-508, June 16-21, 2013. 
  62. Junfeng Wu, Xuanqin Mou, Hengyong Yu and Ge Wang; Statistical interior tomography via dictionary learning without assuming an object support;  12th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, p.440-443, June 16-21, 2013. 
  63. Yan Xi, Jun Zhao, Xiaojing Huang, Hengyong Yu, Yuxin Wang and Ge Wang; Spectrography for 3D analysis from a single spectral view; Proceedings of SPIE, Vol. 8845, Article id: 88450I, 8 pages, Aug. 2013, San Diego, CA, United States. 
  64. Hengyong Yu, Chuang Miao, General thresholding representation for the Lp regularization problem, International Symposium on Biomedical Imaging,  p. 201-204, April 28-May 2, 2014. 
  65. Hao Gong, Chuang Miao, Hengyong Yu, Ge Wang and Guohua Cao; Real phantom datasets for the evaluation of reconstruction algorithms at various dose conditions, International Symposium on Biomedical Imaging, p. 65-68, April 28-May 2, 2014.   
  66. Kaijie Lu, Baodong Liu and Hengyong Yu; On dose reduction and view number in computed tomography, National (China) Symposium on Digital x-ray Imaging and CT New Technology,  p. 226-232, May 29-30, 2014. 
  67. Yanbo Zhang, Hengyong Yu, Xuanqin Mou and Ge Wang; Dictionary learning and low rank based multi-energy CT reconstruction, 3rd CT Meeting, p.79-82, June 22-25, 2014. 
  68. Chuang Miao, Hengyong Yu; General thresholding representation for the Lp regularization and its application in computed tomography; 3rd CT Meeting, p.257-260, June 22-25, 2014. 
  69. Rui Liu, Hengyong Yu; GPU-based implementation for interior tomography; 3rd CT Meeting, p.261-264, June 22-25, 2014. 
  70. Xuanqin Mou, Junfeng Wu, Ti Bai, Qiong Xu, Hengyong Yu and Ge Wang; Dictionary learning based low-dose x-ray CT reconstruction; Proceedings of SPIE, Vol.9212, Article ID: 921207, 15 pages, Aug. 2014, San Diego, CA, United States. 
  71. Xuelin Cui, Hengyong Yu, Ge Wang and Lamine Mili; Total variation minimization based multimodality medical image reconstruction; Proceedings of SPIE, Vol.9212, Article ID: 92121D, 11 pages, Aug. 2014, San Diego, CA, United States. 
  72. Rui Liu, Lu He, Yan Luo and Hengyong Yu; 2D Singular value decomposition based interior tomography, 13th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, pp.146-149, 2015. 
  73. Xuanqin Mou, Ti Bai, Xi Chen, Hengyong Yu, Qingsong Yang, and Ge Wang; Optimal selection for regularization parameter in iterative CT reconstruction based on the property of natural image statistics; 13th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, pp.383-386, 2015. 
  74. Yanbo Zhang, Xuanqin Mou, Hengyong Yu and Ge Wang; Ratio of multi-channel representation (rMCR) based spectral CT reconstruction; 13th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, pp.403-406, 2015. 
  75. Yanbo Zhang, Xuanqin Mou, Qiong Xu, Hengyong Yu and Ge Wang; Tensor based dictionary learning for spectral CT reconstruction; 13th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, pp.507-510, 2015. 
  76. Ming Chen and Hengyong Yu; Analytic reconstruction algorithm for triple-source CT with horizontal data truncation; 13th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, pp.678-681, 2015. 
  77. Lu He, Yan Luo, Rui Liu, Hengyong Yu, Yu Cao, Xuzhou Chen and SeungWoo Son; Bisection and twisted SVD on GPU; 2015 IEEE High Performance Extreme  Computing Conference (HPEC’15), Boston, MA,  Article ID: 978-1-4673-9286-0/15, 7 pages, 2015. 
  78. Lu He, Timothy Miskell, Rui Liu, Hengyong Yu, Huijuan Xu and Yan Luo; Scalable 2D K-SVD parallel algorithm for dictionary learning on GUPs, ACM International Conference on Computing Frontiers 2016, Como, Italy, Article ID: 978-1-4503-4128-8/16/05, 8 pages, 2016.   
  79. Rui Liu, Lin Fu, Bruno De Man and Hengyong Yu;  GPU acceleration of branchless distance driven projection and backprojection;   4th CT Meeting, to appear, July 18-22, 2016, Bamberg, Germany. 
  80. Miaoshi Wang, Yanbo Zhang, Rui Liu, Shuxu Guo and Hengyong Yu; An adaptive reconstruction algorithm for spectral CT regularized by a reference image; 4th CT Meeting, to appear, July 18-22, 2016, Bamberg, Germany. 
  81. Yanbo Zhang and Hengyong Yu, Tensor decomposition and nonlocal means-based spectral CT reconstruction; Proceedings of SPIE, Vol. 9967-35, to appear, August 28-September 1, 2016, San Diego, CA. 
  82. Panpna Wu, Kewen Xia, Yanbo Zhang, Xiaohua Qian, Ge Wang, Hengyong Yu, Dictionary learning-based CT detection of pulmonary nodules, Proceedings of SPIE, Vol. 9967-63, to appear, August 28-September 1, 2016, San Diego, CA.. 
  83. Morteza Salehjahromi, Yanbo Zhang, Hengyong Yu; Comparison study of different regularizers for spectral computed tomography,  Proceedings of SPIE, Vol. 9967-64, to appear, August 28-September 1, 2016, San Diego, CA.
    Yuan Yuan, Yanbo Zhang, Wilfred Ngwa, Hengyong Yu; An in-vivo small-animal dual-energy micro-CT study using gold nanoparticle contrast agents; Proceedings of SPIE, Vol. 9967-65, to appear, August 28-September 1, 2016, San Diego, CA.
  84. Yuan Yuan, Yanbo Zhang, Wilfred Ngwa, Hengyong Yu; An in-vivo small-animal dual-energy micro-CT study using gold nanoparticle contrast agents; Proceedings of SPIE, Vol. 9967-65, to appear, August 28-September 1, 2016, San Diego, CA.