Bryan P. Bednarz

Credentials: PhD

Position title: Professor, Medical Physics and Human Oncology


Phone: 608/262-5225

L5/176 CSC
Bryan Bednarz is a primary advisor in the Department of Medical Physics.


  • 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

Department Affilations

  • Medical Physics
  • Human Oncology
  • Biomedical Engineering
  • Engineering Physics


  • 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

Research Interests

  • Monte Carlo methods
  • Proton therapy
  • Radiation protection

Awards and Honors

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


  • 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)


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