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Raj  Shekhar

Raj Shekhar Ph.D.

Academic Title: Adjunct Associate Professor
Primary Appointment: Diagnostic Radiology and Nuclear Medicine
Location: Gray Laboratory, 2nd Floor
Phone: (410) 707-8714
Fax: (410) 328-0641
Lab: (410) 706-4661

Personal History:

Dr. Raj Shekhar is an Associate Professor of Diagnostic Radiology. He is also an Affiliate Professor of Bioengineering and Electrical & Computer Engineering at the University of Maryland, College Park. Prior to his current position, he served as a Staff Scientist at the Cleveland Clinic for six years and as a Senior Engineer at Picker International (now Philip Healthcare) for two years.

Dr. Shekhar received his doctorate in Biomedical Engineering from the Ohio State University in 1997. Dr. Shekhar's research interests are medical image processing, real-time computing, 3D ultrasound and image-guided interventions. His research has received support from both federal and private sources. He has led the Department of Defense sponsored 3D ultrasound imaging initiative. He was also the PI of a Whitaker Foundation research grant on developing advanced cardiac applications using real-time 3D ultrasound and a National Medical Technology Testbed supported project on real-time 3D image registration. He also teaches medical imaging and is currently mentoring five graduate students and post doctoral fellows.

Dr. Shekhar has authored/coauthored over 75 scientific papers, including over 30 in peer-reviewed journals. He holds four US patents.

Research Interests:

Medical Imaging, image registration and fusion, image-guided interventions, high-performance computing

Lab Techniques and Equipment:

  • 8-Node CPU/GPU/FPGA computing cluster
  • Terason Laptop-based ultrasound scanner
  • Polaris optical tracker
  • Microscibe articulated arm (mechanical 3D tracker)


Selected Publications

Dandekar O, Plishker W, Bhattacharyya SS, Shekhar R. Multiobjective optimization for reconfigurable implementation of medical image registration. Accepted by International Journal of Reconfigurable Computing.

Walimbe V, Jaber WA, Garcia M, Shekhar R. Interactive, quantitative multimodality cardiac stress testing: Combining real-time 3D echocardiography and myocardial perfusion SPECT. Accepted by Journal of Nuclear Medicine.

Dandekar O, Shekhar R. FPGA-accelerated deformable registration for improved target-delineation during CT-guided interventions. IEEE Transactions on Biomedical Circuits and Systems 1(2):116-127, 2007.

Zagrodsky V, Phelan M, Shekhar R. Automated detection of a blood pool in ultrasound images of abdominal trauma. Ultrasound in Medicine and Biology, 33(11):1720-1726, 2007.

Dandekar O, Castro-Pareja CT, Shekhar R. FPGA-based real-time 3D image preprocessing for image-guided medical interventions. Journal of Real-Time Image Processing 1(4):285-301, 2007.

Shekhar R, Lei P, Castro-Pareja CR, Plisker WL, D'Souza WD. Automatic segmentation of phase-correlated CT scans through nonrigid image registration using geometrically regularized free-form deformation. Medical Physics 34(7): 3054-3066.

Walimbe V, Garcia M, Lalude O, Thomas J, Shekhar R: Quantitative real-time three-dimensional stress echocardiography: A preliminary investigation of feasibility and effectiveness. Journal of the American Society of Echocardiography 20(1):13-22, 2007.

Walimbe V, Shekhar R: Automatic elastic image registration by interpolation of 3D rotations and translations from discrete rigid-body transformations. Medical Image Analysis 10:899-914, 2006.

Shekhar R, Walimbe V, Raja S, Zagrodsky V, Kanvinde M, Wu G, Bybel B: Automated three-dimensional elastic registration of whole-body PET and CT from separate or combined scanners. Journal of Nuclear Medicine 46(9):1488-1496, 2005.

Zagrodsky V, Walimbe V, Castro-Pareja CR, Qin JX, Song J-M, Shekhar R: Registration-assisted segmentation of real-time 3-D echocardiographic data using deformable models. IEEE Transactions on Medical Imaging 24(9):1089-1099, 2005.

Castro-Pareja CR, Shekhar R: Hardware acceleration of mutual information-based 3D image registration. Journal of Imaging Science and Technology 49(2):105-113, 2005.

Shekhar R, Zagrodsky V, Garcia M, Thomas JD: Registration of real-time 3D ultrasound images of the heart for novel 3D stress echocardiography. IEEE Transactions on Medical Imaging 23(9):1141-1149, 2004.

Shekhar R, Zagrodsky V: Cine MPR: Interactive multi-planar reformatting of four-dimensional cardiac data using hardware-accelerated texture mapping. IEEE Transactions on Information Technology in Biomedicine 7(4):384-393, 2003.

Shekhar R, Zagrodsky V: Mutual information-based rigid and nonrigid registration of ultrasound volumes. IEEE Transactions on Medical Imaging 21(1):9-22, 2002.