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Bryan Bednarz, Ph.D.

Assistant Professor, Medical Physics and Human Oncology

Department Affiliations

Medical Physics

Human Oncology


B.S.E. University of Michigan, Nuclear Engineering and Science, 2004

M.S. University of Michigan, Nuclear Engineering and Science, 2005

Ph.D. Rensselaer Polytechnic Institute, Nuclear Engineering and Science, 2008

Research Interests

Monte Carlo methods

Proton therapy

Radiation protection


  • Assistant Professor, Departments of Medical Physics and Human Oncology, University of Wisconsin-School of Medicine and Public Health, Madison, WI.
  • 2008-2010, Postdoctoral Research Fellow, Department of Radiation Oncology,
    Massachusetts General Hospital and Harvard Medical School, Boston, MA

Awards and Honors

  • Physics in Medicine and Biology Highlights, Top 25 Paper of 2008


  • American Association of Physicists in Medicine
  • American Nuclear Society
  • Health Physics Society


  • Su L, Yang Y, Bednarz B, Sterpin E, Du X, Liu T, Ji W, Xu XG, "ARCHERRT - a GPU-based and photon-electron coupled Monte Carlo dose computing engine for radiation therapy: software development and application to helical tomotherapy," Med Phys. 2014 Jul;41(7):071709 (2014)
  • Fowler TL, Fulkerson RK, Micka JA, Kimple RJ, Bednarz BP, "A novel high-throughput irradiator for in vitro radiation sensitivity bioassays," Phys Med Biol. 2014 Mar 21;59(6):1459-70 (2014)
  • Yang Y, Bednarz B, "Consistency evaluation between EGSnrc and Geant4 charged particle transport in an equilibrium magnetic field for clinical use," Phys. Med. Biol. 58, N47- N58 (2013)
  • Besemer A, Paganetti H, Bednarz B, "The clinical impact of uncertainties in the mean excitation energy of human tissues during proton therapy," Phys Med Biol. 2013 Feb 21;58(4):887-902 (2013)
  • Bednarz B, Chen G, Paganetti H, Han B, Ding A, Xu XG, "Comparison of particle-tracking features in Geant4 and MCNPX codes for applications in mapping of proton range uncertainty," Nucl Technol. 2011 Jul;175(1):2-5 (2011)
  • Bednarz B, Lu HM, Engelsman M, Paganetti H, "Uncertainties and correction methods when modeling passive scattering proton therapy treatment heads with Monte Carlo," Phys Med Biol. 2011 May 7;56(9):2837-54 (2011)
  • Bednarz B, Daartz J, Paganetti H, "Dosimetric accuracy of planning and delivering small proton therapy fields," Phys Med Biol. 2010 Dec 21;55(24):7425-38 (2010)
  • Bednarz B, Athar B, Xu XG, "A comparative study on the risk of second primary cancers in out-of-field organs associated with radiotherapy of localized prostate carcinoma using Monte Carlo-based accelerator and patient models," Med Phys. 2010 May;37(5):1987-94 (2010)
  • Athar BS, Bednarz B, Seco J, Hancox C, Paganetti H, "Comparison of out-of-field photon doses in 6 MV IMRT and neutron doses in proton therapy for adult and pediatric patients," Phys Med Biol. 2010 May 21;55(10):2879-91 (2010)
  • Paganetti H, Athar BS, Bednarz B, "Dose-rate effects when estimating risks for second malignancies: in regard to Fontenot et al," Int J Radiat Oncol Biol Phys. 2009 Dec 1;75(5):1624 (2009)
  • Han B, Bednarz B, Xu XG, "A study of the shielding used to reduce leakage and scattered radiation to the fetus in a pregnant patient treated with a 6-MV external X-ray beam," Health Phys. 2009 Dec;97(6):581-9 (2009)
  • Bednarz B, Hancox C, Xu XG, "Calculated organ doses from selected prostate treatment plans using Monte Carlo simulations and an anatomically realistic computational phantom," Phys Med Biol. 2009 Sep 7;54(17):5271-86 (2009)
  • Bednarz B, Xu XG, "Monte Carlo modeling of a 6 and 18 MV Varian Clinac medical accelerator for in-field and out-of-field dose calculations: development and validation," Phys Med Biol. 2009 Feb 21;54(4):N43-57 (2009)
  • Bednarz B, Xu XG, "A feasibility study to calculate unshielded fetal doses to pregnant patients in 6-MV photon treatments using Monte Carlo methods and anatomically realistic phantoms," Med Phys. 2008 Jul;35(7):3054-61 (2008)
  • Gu J, Bednarz B, Xu XG, Jiang SB, "Assessment of patient organ doses and effective doses using the VIP-Man adult male phantom for selected cone-beam CT imaging procedures during image guided radiation therapy," Radiat Prot Dosimetry. 2008;131(4):431-43 (2008)
  • Xu XG, Bednarz B, Paganetti H, "A review of dosimetry studies on external-beam radiation treatment with respect to second cancer induction," Phys Med Biol. 2008 Jul 7;53(13):R193-241 (2008)
  • Zhang J, Bednarz B, Xu XG, "An investigation of voxel geometries for MCNP-based radiation dose calculations," Health Phys. 2006 Nov;91(5 Suppl):S59-65 (2006)
  • Charland PM, Chetty IJ, Paniak LD, Bednarz B, Fraass BA, "Enhanced spectral discrimination through the exploitation of interface effects in photon dose data," Med Phys. 2004 Feb;31(2):264-76 (2004)

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