I have been working on Single Photon Emission Computed Tomography (SPECT) as a Staff Scientist at Siemens (Science and Technology). My current research is focused on developing a next generation SPECT system and image reconstruction algorithms that change clinically relevant long-lasting challenges ultimately benefiting the ones that I love and their beloved ones.
Before joining Siemens Science & Technology, I had worked at General Electric Global Research Center (GE GRC) as a Lead Scientist working on Computed Tomography physics and model based image reconstruction for improving CT image quality. My role is currently to apply mathematical optimization techniques and signal processing concepts to the problem of CT image reconstruction.
I was a research scientist of Duke Imaging and Spectroscopy Program supervised by David J. Brady at Duke University, working on computational imaging theory and applications. My focus is on applying cutting-edge signal processing theory to imaging problems. In particular, I am interested in solving imaging problems under nonlinear imaging models using compressive sensing and convex optimization theory featuring convex relaxation. I am also interested in solving computational challenges (e.g., large-scale optimization, parallel processing) arising in large-scale problems. 
My practical interests particularly focus on imaging applications that can have direct impact on and contribution to promoting the quality of our lives. For that, I have been interested in imaging in healthcare such as computed tomography and magnetic resonance imaging. Recently, I became very interested in imaging challenges in energy fields such as seismic imaging and noninvasitve imaging modalities for investigating materials (or even some chemicals). Naturally, my background and skills have been concentrated around theory and practice pertinent to these imaging problems. With the background and skills, I hope to strive to solve some of the most important and challenging problems in the areas I am interested in.
I have been also interested in brain signal processing and cognitive neuroscience. In particular, I am interested in mathematical interpretations of brain activities related to visions and medical treatments of brain diseases.
Contact Info

  • Ph.D., Electrical and Computer Engineering, Georgia Tech 2005
  • M.S., Electrical and Computer Engineering, University of Florida, 2002
  • B.S., Electrical Engineering, Inha University 2000 

  • Staff Scientist, Molecular Imaging Science & Technology, Siemens Medical Solution 2012/06-current
  • Lead Scientist, CT, X-ray, and Functional Imaging Lab, General Electric Global Research Center 2011/01-2012/06 
  • Research Scientist, Collaborator: David J. Brady, Duke Imaging and Spectroscopy Program, Department of Electrical and Computer Engineering, Duke University 2010/03-2011/01
  • Postdoctoral Associate, Advisor: David J. Brady, Duke Imaging and Spectroscopy Program, Department of Electrical and Computer Engineering, Duke University 2008/09-2010/02
  • Postdoctoral Fellow, Advisor: Timothy J. Schulz and Michael Roggemann, Department of Electrical and Computer Engineering, Michigan Technological University 2006-2008 

News & Reflections

  • Natiotional Academy of Engineering Grand Challenges Retrospecting one of the earliest motivations I had when I decided to go into grad school, I realize I still strongly hold the hope to make contributions to our daily ...
    Posted Nov 22, 2010, 3:48 PM by Kerkil Choi
  • Controversial business practice: bankrolling lawsuits I read a NYT article on the investment on lawsuits for lucrative returns. It is an interesting business innovation that has seemed to create many controversies and opportunities. It looks ...
    Posted Nov 17, 2010, 7:11 AM by Kerkil Choi
  • Joining GE Global Research Center! After a series of interviews and offers and declinations, I decided to join GE GRC working for the CT Systems and Applications group. It is full of great, competent people ...
    Posted Nov 2, 2010, 4:24 AM by Kerkil Choi
  • My recent article has been selected for publication in VJBO. The paper I wrote with Dr. Horisaki "Generalized sampling using a compound-eye imaging system for multi-dimensional object acquisition" has been selected by the editor-in-chief, Gregory Faris ...
    Posted Oct 22, 2010, 9:46 AM by Kerkil Choi
  • Exemplary leadership Motivated by recent meetings with several people in business, I have come to think about what terrific leaders would need to inspire and encourage his people and organization while handling ...
    Posted Oct 29, 2010, 6:08 AM by Kerkil Choi
Showing posts 1 - 5 of 15. View more »
 Recent Journal Publications
AuthorsTitle/Full-text PDFJournal
Kerkil Choi, Ryoichi Horisaki, Joonku Hahn, Sehoon Lim, Daniel L. Marks, Timothy J. Schulz, and David J. Brady Compressive Holography of Diffuse Objects Applied Optics, Vol. 49, Issue 34, pp. H1-H10  
Ashwin A. Wagadarikar, Daniel L. Marks, Kerkil Choi, Ryoichi Horisaki, and David J. Brady  Imaging through turbulence using compressive coherence sensing Optics Letters, , Vol. 35, Issue 6, pp. 838-840  
Qian Xu, Kebin Shi, Haifeng Li, Kerkil Choi, Ryoichi Horisaki, David Brady, Demetri Psaltis, and Zhiwen Liu  Inline holographic coherent anti-Stokes Raman microscopy Optics Express, Vol. 18, Issue 8, pp. 8213-8219 (Also, in the Virtual Journal for Biomedical Optics, Vol. 5, Issue 8, 2010) 
Showing 3 items from page Journal Publications sorted by edit time. View more »


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