The Radiological Physics Division

The Radiological Physics Division (RPD) was initially established in July 2002 as the Division of Medical Imaging Physics (DMIP) with the recruitment of Benjamin Tsui and his 14 associates — in 2018, George Sgouros became director of the division.  It was rebranded as the Radiological Physics Division to expand its mission beyond imaging so that all of radiological physics, including radionuclide therapy is encompassed.

Mission Statements

  • Conduct state-of-the-art research in medical imaging physics, especially in the areas of nuclear medicine, including PET and SPECT, and X-ray imaging, including CT.
  • Establish a graduate degree program in medical imaging physics within the Department of Radiology and Radiological Science.
  • Provide physics education to residents, fellows and technologists.
  • Provide clinical physics support to various clinical divisions of the Department of Radiology and Radiological Science.      

Our Research

Education Programs

Master’s in Medical Physics

The program is designed for full-time students who wish to pursue a career as a medical physicist either as a researcher, as a certified clinical professional, or in industry. The program will require successful completion of a minimum of 38 credits for Master’s degree and completion of a research thesis (in conjunction with one or more of the faculty). Full-time master’s students will complete the program in two years.

Learn more. 

Prospective Postdocs

The Division employs a number of postdoctoral fellows working on research projects funded by research grants and contracts. Most of the research projects require significant technical skills and knowledge in physics, mathematics, computer science, radiobiology, dosimetry, engineering and/or medical physics. Excellent English language and communication skills are also essential. Applicants with previous skills directly related to the research projects of interest are strongly preferred.

Postdoctoral Fellowship applicants should contact the division faculty staff directly for availability in his/her lab. Previous postdoctoral fellows have gone on to careers in academia, clinical medical physics, and industry.


George Sgouros, Ph.D.

Director and Professor

George Sgouros, Ph.D. headshot
Eric Charles Frey, Ph.D.


Eric Charles Frey headshot
Yong Du, M.S., Ph.D.

Associate Professor

Yong Du headshot
Jingyan Xu, M.S., Ph.D.

Assistant Professor

Jingyan Xu headshot
Tahir Yusufaly, Ph.D.

Assistant Professor

Tahir Yusufaly headshot
Colin Paulbeck, Ph.D.

Assistant Professor

Colin Paulbeck headshot
Troy Zhou, Ph.D.

Radiology Physics and Engineering, Chief Physicist

Troy Zhou headshot
Junyu Chen, Ph.D.


Junyu Chen, Ph.D.

Research Associates

  • Remco Bastiaannet, Ph.D.

Postdoctoral Fellows

  • Mahmud Hasan, Ph.D.
  • Donghyeon Lee, Ph.D.
  • FNU Anupriya, Ph.D.
  • Nouran Rashed Rushdi Zaid, Ph.D.


  • Zhi Li, Ph.D., Sr. Research Specialist
  • Debbie Race, B.S., Administrative Specialist, Master’s Program Administrator
  • Allison Cartee, B.S.

Graduate Students

Shalini Subramanian
Ph.D. student
Biomedical Engineering
(K. Taguchi/advisor)

Michael Blamires
M.S. student
Medical Physics

Kevin C. Whittington, Ph.D.
M.S. student
Medical Physics

Natalie Kania
M.S. student
Medical Physics

Yunjie “Peter” Gao
M.S. student
Medical Physics

Scarlett Wei
Ph.D. student
Biomedical Engineering
(K. Taguchi/advisor)

Sizhuo Meng M.S.
M.S. Student
Medical Physics

Katie Kelly
M.S. student
Medical Physics

Affiliated Faculty

  • Brian Caffo, Ph.D., Associate Professor, Johns Hopkins School of Public Health
  • Jonathan Links, Ph.D., Joint Appointment in Emergency Medicine


  • George Fung, Ph.D., Assistant Professor

Contact Information

Radiological Physics Division
Russell H. Morgan Department of Radiology and Radiological Science
Johns Hopkins Medical Institutions
601 N. Caroline St.
JHOC Room 4263
Baltimore, MD 21287

Contact our administrative coordinator:
Phone: 443-287-2425
Fax: 410-614-1060