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Books

• Mark J.T. Smith and Alen Docef. “A Study Guide for Digital Image Processing.” Scientific Publishers, 1997.

Classes Taught

• EGRE 591 Advanced Digital Signal Processing
• EGRE 535 Digital Signal Processing
• EGRE 444 Communication Systems
• EGRE 337 Signals and Systems II
• EGRE 335 Signals and Systems I
• EGRE 150 Introduction to Electrical Engineering

Current Projects

• Tomographic image compression
• Deformable image registration and reconstruction for radiotherapy applications
• Quantitative MR imaging for measurement of water content in the human brain

Education

• Diploma of Engineer, Polytechnic Institute, Bucharest, Romania, 1991
• M.S.E.E., Georgia Institute of Technology, Atlanta, Ga. 1992
• Ph.D. Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Ga., 1998

Patents

• Mark J.T. Smith and Alen Docef. “Video coding system and method for noisy signals.” U.S. Patent No. 5,974,186, October 1999.
• Ismaeil R. Ismaeil, Alen Docef, and Faouzi Kossentini. “Method and apparatus for video coding.” U.S. Patent No. 6,876,703, April 2005.

Refereed Publications

• S.S. Vedam, P.J. Keall, A. Docef, D.A. Todor, V.R. Kini, and R. Mohan. “Improving the long term predictive ability of linear models for respiratory motion in 4d radiation delivery.” American Association of Physicists in Medicine Meeting, July 2004.
• S.S. Vedam, P.J. Keall, A. Docef, D.A. Todor, V.R. Kini, and R. Mohan. “Predicting respiratory motion for four-dimensional radiotherapy.” Medical Physics, August 2004.
• Hong Man, Alen Docef, and Faouzi Kossentini. “Performance analysis of the JPEG 2000 image coding standard.” Multimedia Tools and Applications Journal, May 2005.
• S. Vedam, M. Murphy, A. Docef, R. George and P. Keall. “Long term prediction of respiratory motion with artificial neural network based adaptive filtering techniques.” American Association of Physicists in Medicine 47th Annual Meeting, July 2005.
• S.Vedam, A. Docef, M. Fix, M. Murphy, and P. Keall. “Dosimetric impact of geometric errors due to respiratory motion prediction on dynamic multileaf collimator based 4D radiation delivery.” Medical Physics, 2005.
• Alen Docef, Martin J. Murphy, Paul J. Keall, Jeffrey V. Siebers, and Jeffrey F. Williamson. “Deformed CT reconstruction from limited projection data.” Computer Assisted Radiology and Surgery International Congress and Exhibition, June 2005.

Research Topics

• Signal processor architectures
• Document compression for archiving
• Efficient, error-resilient, network-optimized image and video coding
• Medical image processing