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Department of Radiation Oncology

Sonja Dieterich, Ph.D. View profile as PDF

Sonja  Dieterich

Clinical Interests

I specialize in the medical physics of complex treatments and small-field dosimetry, with vast experience in frameless stereotactic radiosurgery and stereotactic body radiotherapy and an interest in image-guided high-dose-rate (HDR) brachytherapy. My clinical research interests include improving image- guidance in HDR brachytherapy and in-vivo dosimetry to validate new dose calculation algorithms. As a medical physicist, I collaborate closely with physicians to determine the best use of advanced technology for each individual situation and contribute my technical expertise to support our patients' fight against cancer.


Associate Professor
Medical Physicist


Cancer, Medical Physics, Radiation Oncology



Radiation Oncology

Center/Program Affiliation:

Other Languages:



Ph.D., Rutgers, The State University of New Jersey, Piscataway, NJ, 2002
M.S., Technical University Darmstadt, Darmstadt, 1998


Georgetown University, Washington D.C., 2002
Georgetown University Hospital, Washington D.C., 2003

Board Certifications:

American Board of Radiology, Therapeutic Radiological Physics, 2006

Professional Memberships:

American Association of Physicists in Medicine (AAPM)
American College of Radiology (ACR)
American Physical Society (APS)
American Society of Therapeutic Radiation Oncology (ASTRO)
Radiosurgery Society (RSS)

Select Honors and Awards:

FDA, "Certificate for Outstanding Contribution on Promoting Patient Safety with Medical Devices", 2010

AAPM Medical Physics Travel Grant, 2007

6th Annual CyberKnife User?s Meeting, "Most Outstanding Abstract", 2007

3rd Annual CyberKnife User?s Meeting, "Outstanding Technical Achievement Award", 2003

Select Recent Publications:

L. Wang, K. N. Kielar, E. Mok, A. Hsu, S. Dieterich and L. Xing, "An end-to-end examination of geometric accuracy of IGRT using a new digital accelerator equipped with onboard imaging system," Phys Med Biol. 2012; 57, 757-769.

A. Ho, A. T. Lo, S. Dieterich, S. G. Soltys, I. C. Gibbs, S. G. Chang and J. R. Adler, "Trigeminal neuralgia treatment dosimetry of the Cyberknife," Med Dosim (2011).

A. Schlaefer and S. Dieterich, "Feasibility of case-based beam generation for robotic radiosurgery," Artif Intell Med (2011).

J. C. Hong, Y. Yu, A. K. Rao, S. Dieterich, P. G. Maxim, Q. T. Le, M. Diehn, D. Y. Sze, N. Kothary and B. W. Loo, Jr., "High retention and safety of percutaneously implanted endovascular embolization coils as fiducial markers for image-guided stereotactic ablative radiotherapy of pulmonary tumors," Int J Radiat Oncol Biol Phys. 2011; 81, 85-90.

S. Dieterich, C. Cavedon, C. F. Chuang, A. B. Cohen, J. A. Garrett, C. L. Lee, J. R. Lowenstein, M. F. d'Souza, D. D. Taylor, Jr., X. Wu and C. Yu, "Report of AAPM TG 135: quality assurance for robotic radiosurgery," Med Phys.2011; 38, 2914-2936.

Murphy, J. D., Christman-Skieller, C., Kim, J., Dieterich, S., Chang, D. T. Koong, A. C. A Dosimetric Model of Duodenal Toxicity After Stereotactic Body Radiotherapy for Pancreatic Cancer. Int J Radiat Oncol Biol Phys (2010).

S. Dieterich and G. W. Sherouse, "Experimental comparison of seven commercial dosimetry diodes for measurement of stereotactic radiosurgery cone factors," Med Phys 38, 4166-4173 (2011). A. Sawant, S. Dieterich, M. Svatos and P. Keall, "Failure mode and effect analysis-based quality assurance for dynamic MLC tracking systems," Med Phys. 2010; 37, 6466-6479.

Minn AY, Schellenberg D, Maxim P, Dieterich S, et al. Pancreatic Tumor Motion on a Single Planning 4D-CT Does Not Correlate With Intrafraction Tumor Motion During Treatment. Am J Clin Oncol 2009.

Wiersma RD, Riaz N, Dieterich S, et al. Use of MV and kV imager correlation for maintaining continuous real-time 3D internal marker tracking during beam interruptions. Phys Med Biol 2009;54:89-103.

Wu, X., Dieterich, S. Orton, C. G. Point/counterpoint. Only a single implanted marker is needed for tracking lung cancers for IGRT. Med Phys.2009; 36, 4845-4847.

To see if Sonja Dieterich is accepting new patients, or for assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).