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Radiation Oncology UCLA



Medical Physics Faculty:

Letter from the Medical Physics Team

Nzhde Agazaryan, Ph.D., DABR Nzhde Agazaryan, Ph.D., DABR
Professor of Radiation Oncology and Chief of Clinical Medical Physics

Dr. Agazaryan is a Professor of Radiation Oncology and the Chief of Clinical Medical Physics at the UCLA Radiation Oncology. He is also a Professor of Biomedical Physics Graduate Program. His appointment in the Department of Radiation Oncology involves research, teaching and clinical practice. His research and clinical interests include stereotactic radiosurgery (SRS/SRT), stereotactic body radiotherapy (SBRT), small field dosimetry, image-guided radiotherapy (IGRT), functional image-guided radiotherapy, gated radiotherapy, eye plaque brachytherapy. Dr. Agazaryan is a Diplomate of The American Board of Radiology (DABR) - board certified in Therapeutic Radiologic Physics. He is also California State licensed to conduct therapy machine calibration and radiation protection surveys.

Minsong Cao, Ph.D., DABR
Assistant Professor

Dr. Cao received his Ph.D. in Medical Physics from Purdue University in 2007.  Prior to joining UCLA, he was appointed as an Assistant Professor in the Department of Radiation Oncology at the Indiana University. He is certified by the American Board of Radiology in radiation therapy physics. His research interests include image guidance in radiation oncology, functional and physiological imaging and stereotactic body radiation therapy. 

Phillip Chow, M.S. Phillip Chow, M.S., DABR
Medical Physicist

Phillip Chow graduated from UCLA with a Bachelor of Science degree in Physics in 1990.  While attending graduate school in Astrophysics, he began working as a Medical Dosimetrist in 1992.  He received his certification from the Medical Dosimetrist Certification Board (MDCB) in 1995.  He then moved to Bangor, Maine in 1996 where he worked for two years as a Certified Medical Dosimetrist before being offered a position at Kaiser Permanente in Southern California.  He stayed with Kaiser from 1998 to 2000 when he was accepted to the Biomedical Physics Graduate Program here at UCLA, starting in September of that year.  He earned his Master of Science degree in Biomedical Physics in 2004 and shortly thereafter began working as a Medical Physicist here in the UCLA Department of Radiation Oncology.  He is currently working on his Ph.D. in Biomedical Physics while working full-time as a Medical Physicist at UCLA.

James Lamb, Ph.D. James Lamb, Ph.D.
Assistant Professor in Residence

Dr. Lamb is an Assistant Professor in Residence in the UCLA Department of Radiation Oncology. He received his Ph.D. in experimental high-energy particle physics from the University of California at Santa Barbara in 2009. After completing his Ph.D., Dr. Lamb was a post-doctoral researcher in the Department of Radiation Oncology at Washington University in Saint Louis. His research interests include respiratory-correlated imaging (4D-PET/4D-CT), lung cancer functional imaging, Monte Carlo simulation, and data mining. His clinical interests include episcleral plaque radiotherapy for ocular melanoma, automation of patient-specific quality-control, and the use of cutting-edge software technologies in radiation oncology.

Chul Lee, M.S., DABR Chul Lee, M.S., DABR
Medical Physicist

Chul Lee has been working as a medical physicist at UCLA Radiation Oncology since January 2006. He obtained Master's degree in Medical Physics from Medical College of Ohio in December 2005.  Prior to coming to UCLA, he worked as a researcher in radiochemistry laboratory for ten years at University of Michigan - Ann Arbor.


John, Lewis, Ph.D. John Lewis, Ph.D., DABR
Assistant Professor

Dr. Lewis earned his Ph.D. in Physics in 2010 from UC San Diego, where his research focused on motion management and cone-beam CT imaging. After graduate school he joined the faculty at Brigham and Women's Hospital and Harvard Medical School where he worked for five years until joining UCLA in 2015. Dr. Lewis is board certified by the American Board of Radiology in Medical Physics. His research interests include respiratory motion modeling, delivered radiation dose verification, and MRI-guided radiotherapy.

Daniel Low, Ph.D., DABMP Daniel Low, Ph.D., DABMP
Professor and Vice Chair of Physics

Dr. Low earned his Ph.D. in Physics in 1988 from Indiana University and was a postdoctoral fellow for two years in radiation therapy physics at M.D. Anderson Cancer Center. He moved to Washington University where he eventually became a Professor and Director of Medical Physics. Dr. Low moved to UCLA in 2010 as the Vice Chair and Director of Medical Physics. Dr. Low is board certified by the American Board of Medical Physics in Therapeutic Medical Physics and by the American Board of Radiology and is a fellow of the American Association of Physicists in Medicine. His research interests include modeling of human breathing motion, radiation therapy safety, quality assurance methods, image-guided radiation therapy including magnetic resonance-image guided radiation therapy. 

Sang-June Park, Ph.D. Sang-June Park, Ph.D., DABR
Assistant Professor

Dr. Park is an Assistant Clinical Professor and currently leading physicist of the Division of Brachytherapy in the UCLA Department of Radiation Oncology. He received his PhD from the Nuclear Engineering and Radiological Sciences, University of Michigan in 2005. After his PhD, Dr. Park joined Brookhaven National Laboratory for small animal imaging research (2005-2006). He received medical physics training from Harvard Medical School Department of Radiation Oncology at Brigham and Women’s Hospital and Dana-Farber Cancer Institute (2006-2009). His research interests include Brachytherapy, Monte Carlo simulations, EPID-based implanted marker tracking, respiratory gated imaging (4D-PET/4D-CT), and small animal imaging.

Sharon Qi, Ph.D. Sharon Qi, Ph.D., DABR
Assistant Professor

Dr. Qi received her PhD in Experimental Particle Physics from the Institute of High Energy Physics, Chinese Academy of Sciences in China. After her PhD, Dr. Qi worked at the Fermi National Accelerator Laboratory (Fermilab) as an Associate Scientist (2000-2004). Dr. Qi received her medical physics training at the Medical College of Wisconsin (2004-2006). Prior to joining UCLA, she worked at Medical College of Wisconsin and University of Colorado Denver as an Assistant Professor. She is certified by the American Board of Radiology in therapeutic radiologic physics. Dr. Qi's research interests include biological/functional imaging guided radiation therapy and adaptive radiation therapy, respiration and motion management, clinical outcome assessment and biological modeling. 

Dan Ruan, Ph.D. Dan Ruan, Ph.D.
Assistant Professor

Dr. Ruan received her Ph.D in Electrical Engineering from University of Michigan, Ann Arbor in 2008. She was an instructor at Stanford University before becoming a faculty member at UCLA in 2010.  Dr. Ruan's research interests includes medical imaging, tomography, parametric and nonparametric estimation, dynamic systems, and general inverse problems in medical signal processing. Her current works focus on physics system modeling and characterization, algorithm development and performance analysis, as well as software-hardware system integration and validation. She is particularly interested in understanding the mathematics and physics in diagnostic radiology and radiation oncology.

Anand Santhanam Anand Santhanam, Ph.D.
Assistant Professor

Dr. Santhanam’s focus is on developing algorithms and techniques that cater to the requirements of medicine. In particular, he worked on the biomechanical modeling of lungs since 2002 for different applications ranging from computer animation, virtual reality, rehabilitation, tissue engineering to radiation oncology. His PhD dissertation was focused on developing High Performance Computing based algorithms for physics and physiology based 3D lung dynamics using state-of-art Graphics Processing Units (GPU) under the co-direction of Professor Jannick Rolland (currently at the University of Rochester, NY) and Dr. Sumanta Pattanaik (currently at the University of Central Florida) from August 2002 to May 2006. He also received the Link Foundation Fellowship award for his research during the year 2005. Dr. Santhanam was the University of Central Florida’s principal investigator of Florida James and Esther King 2008-10 Team Science Project grant for $1 Million in collaboration with the M.D. Anderson Cancer Center Orlando, which focuses on incorporating 3D biomechanical lung dynamic models for assessing the treatment efficacy of lung radiotherapy. Dr. Santhanam’s current research focus is on developing single GPU and multi-GPU accelerated algorithms for 3D/4D image processing, model based lung registration, anatomy deformation modeling, deformation based elasticity estimation, tumor dosimetry and lung deformation based radiotherapy evaluation. He has published several journal publications in the field of biomechanical organ modeling.

Ke Sheng, Ph.D., DABR Ke Sheng, Ph.D., DABR

Dr. Sheng has a B.S. degree in mechanical engineering and an M.S. degree in astrophysics from the University of Science and Technology of China. In 2004, Dr. Sheng received his Ph.D. from the University of Wisconsin-Madison in medical physics. He is certified by the American Board of Radiology in radiation therapy physics. He was appointed as Assistant Professor and then Associate Professor at the University of Virginia prior to joining UCLA. He was promoted to Professor-In-residence in 2015. His main research areas include inverse optimization, 4π non-coplanar radiotherapy, MRI guided radiotherapy, biological outcome modeling and nanotechnology applications in radiation therapy. He has published extensively in these areas. Supported by federal, institutional and industrial grants, he manages an active research team consisting of undergraduate, graduate students and postdoctoral fellows.

Investigator Website:

Steve Tenn, Ph.D., DABR Steve Tenn, Ph.D., DABR
Assistant Professor

Stephen Tenn joined the UCLA Department of Radiation Oncology in November of 2008. He received his PhD from the UCLA Biomedical Physics Graduate Program in 2007. His dissertation project focused on the accuracy of image guidance and gated radiotherapy using the Novalis Radiosurgery system. After completing his PhD Dr. Tenn left UCLA for a one year post doctoral fellowship at the Stanford University Department of Radiation Oncology. While at Stanford he worked with the CyberKnife radiosurgery team as well as with the Stanford Outreach physics program. Dr. Tenn's research interests include investigating image guided methods for accurate stereotactic radiosurgery/radiotherapy and stereotactic body radiotherapy treatments.

Yingli Yang, Ph.D. Yingli Yang, Ph.D.
Assistant Professor

Dr. Yang received her B.S., M.S. in Biomedical Engineering from Tsinghua University, China and her Ph.D. in Biomedical Engineering (more specifically fast magnetic resonance spectroscopy imaging) from Columbia University. She finished her post-doctoral research training and medical physics clinical residency at Memorial Sloan-Kettering Cancer Center before joining UCLA Radiation Oncology faculty in 2011. Dr. Yang's research interests include volumetric modulated arc therapy, advanced MR imaging techniques and its applications in radiation therapy. 


Medical Physics Residents:

Dongsu Du Dongsu Du, Ph.D.
Medical Physics Resident - 1st year

Dr. Du started his Therapeutic Medical Physics residency at UCLA in summer 2015. He gained an M.S. degree in Physics from The University of Texas at Austin and a Ph.D degree in Biomedical Engineering from Washington University in St. Louis. His research interests focus on 4D-MRI techniques, motion management, and treatment planning.

David Thomas, Ph.D. David Thomas, Ph.D.
Medical Physics Resident - 2nd year

Dr. Thomas is currently a 2nd year Therapeutic Medical Physics Resident. He has a MS degrees in Physics and Electrical & Computer Engineering (ECE). In 2010 Dr. Thomas received his Ph.D in Medical Imaging from the University of Edinburgh, UK. Prior to his residency, he was a post-doc at UCLA, studying novel 4D-CT techniques for radiotherapy. His current research interests include: Motion management techniques, 4D dose calculations, Functional lung imaging, MRI guided radiotherapy and Adaptive radiotherapy.


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