My research interests focus on x-ray cone beam CT imaging, including both conventional attenuation-based imaging and novel phase-contrast imaging. The current research projects include:
1. developing flat-panel detector-based cone beam CT systems,
2. applying the cone beam CT technique for breast imaging, vascular imaging, small animal imaging and etc,
3. developing the phase-contrast cone beam CT imaging technique into a practical imaging modality.

Journal publications include:
1. Weixing Cai and Ruola Ning, "Preliminary study of a phase-contrast cone-beam computed tomography system: the edge-enhancement effect in the tomographic reconstruction of in-line holographic images," Opt. Eng. 47(3), 037004 (2008)
2. Weixing Cai, Ruola Ning and David Conover, "A simplified method of scatter correction using beam-stop-array algorithm for cone-beam computed tomography breast imaging," Opt. Eng. 47(9), 097003 (2008)
3. Dong Yang, Ruola Ning and Weixing Cai, "Circle plus partial helical scan scheme for a flat panel detector-based cone beam breast x-ray CT (CBBCT)," Int. J. Biomed. Imag. 2009, 637867 (2009)

Conference publications include:
1. Weixing Cai and Ruola Ning, "Dose efficiency consideration for volume-of-interest breast imaging using x-ray differential phase-contrast CT," Proc SPIE 7258, 72584D (2009)
2. Weixing Cai and Ruola Ning, "Cone-beam reconstruction using retrieved phase projections of in-line holography for breast imaging," Proc. SPIE 6913, 69132Q (2008)
3. Weixing Cai, Ruola Ning, Yan Zhang and David Conover, "Evaluation of a new breast-shaped compensation filter for a newly built breast imaging system," Proc. SPIE 6510, 651039 (2007)
4. Weixing Cai, Ruola Ning and David Conover, "Scatter correction using beam stop array algorithm for cone-beam CT breast imaging," Proc. SPIE 6142, 61423E (2006)
5. Weixing Cai, Ruola Ning and Dong Yang, "Computer simulation of FDK reconstruction with the in-line holographic projection data," Proc. SPIE 6142, 61424G (2006)
6. Ricardo Betancourt-Benítez, Ruola Ning, David Conover, Yan Zhang and Weixing Cai, "Development of a quality control program for a cone beam CT imaging system," Proc. SPIE 6913, 691356 (2008)
7. Ruola Ning, David Conover, Yong Yu, Yan Zhang, Weixing Cai, Ricardo Betancourt-Benitez and Xianghua Lu, "A novel cone beam breast CT scanner: system evaluation," Proc. SPIE 6510, 651030 (2007)
8. Ruola Ning, David Conover, Yong Yu, Yan Zhang, Weixing Cai, Dong Yang and Xianghua Lu, "Flat panel detector-based cone beam CT for dynamic imaging: system evaluation", Proc. SPIE 6142, 61422C (2006)
9. Ruola Ning, David Conover, Yong Yu, Weixing Cai and Xianghua Lu, "Flat panel detector-based cone beam CT lung imaging: Preliminary system evaluation," Proc. SPIE 5745, 147-158 (2005)

• Cai W, Zhao B, Conover D, Liu J, Ning R. Dynamic cone beam CT angiography of carotid and cerebral arteries using canine model. Med Phys. 2012 Jan; 39(1):543.
  View in: PubMed
• Liu J, Ning R, Cai W, Benitez RB. Enhancement of breast calcification visualization and detection using a modified PG method in Cone Beam Breast CT. J Xray Sci Technol. 2012 Jan 1; 20(1):107-20.
  View in: PubMed
• Cai W, Ning R, Conover D. Scatter correction for clinical cone beam CT breast imaging based on breast phantom studies. J Xray Sci Technol. 2011; 19(1):91-109.
  View in: PubMed
• Yang D, Ning R, Cai W. Circle plus partial helical scan scheme for a flat panel detector-based cone beam breast X-ray CT. Int J Biomed Imaging. 2009; 2009:637867.
  View in: PubMed