Sohn Laboratory

Medical Physics and Engineering

Jason W. Sohn, Ph.D

Professor, Department of Radation Oncology
Associate Director, Division of Medical Physics and Dosimetry

  • Phone : 1-216-844-2736

  • Professional Qualification / Memberships

    Certified in Therapeutic Radiological Physics by the ABR in 1995
    Full member - American Association of Physicists in Medicine
    Full member - American Society for Therapeutic Radiology and Oncology


    Ph.D Degree, Biomedical Science, Medical College of Ohio, Toledo, OH
    M.S. Degree, Medical Physics, University of Wisconsin, Madison, WI

    Honors, Awards, and Elected offices

    Fellow of AAPM
    NRG Medical Physics subcommittee Co-chair
    NRG Emerging Technology committee (Medical Physics) Chair
    Examiner (oral test) for American Board of Radiology board, 2001-2004, 2006, 2008, 2010, 2012, 2015
    Radiation Therapy Committee member of AAPM, Jan. 2004 - 2006
    Committee member for Physicist Education in AAPM, 2001-Present
    President for the AAPM Missouri River Valley chapter, Jan. – Dec. 2002
    President-elect for the AAPM Missouri River Valley chapter, Jan. – Dec. 2001
    Committee member for Physician in training in AAPM, 1999-2003


    Biodegradable surgical markers : US 60/895586
    Radiation Shield (Mobile contra-lateral breast shield): PCT Application No. PCT/US00/14974

    Selected Publications

    1. H. Kim*, J. I. Monroe, S. Lo, M. Yao, P. Harari, M. Machtay, J. W. Sohn
      Quantitative Evaluation of Image Segmentation Incorporating Medical Consideration Functions
      Med. Phys., 42, 3013-3024,, 2015: selected as a featured article and shown on the journal cover

    2. B.W. Wessels, C.C. Cheng, F.B. Jesseph, C. Rhodes, R.E. Ellis, D. Mansur, J.W. Sohn, J. Brindle, D. Albani, S. Lo
      Retrospective Prostate Treatment Plan Comparison for Proton, Tomotherapy, and Cyberknife Therapy
      Int. J. of Particle Therapy Oct. 2015, DOI 10.14338/IJPT-15-00004.1

    3. S.H. Ahn**, M.S. Gil, D.S. Lee, Y. Han, H.C. Park, J.W. Sohn, H.Y. Kim, E.H. Shin, J.I. Yu, J.M. Noh, J.S. Cho, S.H. Ahn, D.H. Choi
      Preclinical investigation for developing injectable fiducial markers using a mixture of BaSO4 and biodegradable polymer for proton therapy
      'Med. Phys., 42, 2626-2637 ,, 2015

    4. M. Han, Y. Yeom, C. Kim, S. Kim, J.W. Sohn
      New approach based on tetrahedral-mesh geometry for accurate 4D Monte Carlo patient-dose calculation
      Phys. Med. Biol.:60(4): 1601-12, 2015

    5. M. Awan, S. Liu, A. Sahgal, S. Das, S.T. Chao, E.L. Chang, J. Knisely, K. Redmond, J.W. Sohn, M. Machtay, A.E. Sloan, D.B. Mansur, L.R. Rogers, S.S. Lo
      Extra-CNS metastasis from glioblastoma: a rare clinical entity
      Expert Rev. Anticancer Ther. 15(5):545-552, 2015.

    6. C. C. Okoye+, R. B. Patel, ,1 S. Hasan, T. Podder, A. Khouri, J. Fabien, Y. Zhang, D. Dobbins, J.W. Sohn, J. Yuan, M. Yao, M. Machtay, A. E. Sloan, J. Miller, S. S. Lo
      Comparison of Ray Tracing and Monte Carlo Calculation Algorithms for Thoracic Spine Lesions Treated with CyberKnife-based Stereotactic Body Radiation Therapy
      Technol. Cancer Res. Treat, pii: 1533034614568026, 2015

    7. Y. Cui, W. Chen, F. Kong, L. Appenzoller, R. Beatty, P. Maxim, T. Ritter, J.W. Sohn, J. Higgins, Y. Yu, J. Galvin, Y. Xiao
      Contouring variations and the role of atlas in non-small-cell lung cancer radiotherapy: analysis of a multi-institutional pre-clinical trial planning study
      Pract. Radiat. Oncol., DOI:, 2014.

    8. H. Kim*, S. B. Park, J. I. Monroe, B. J. Traughbar, Y. Zheng, S. Lo, M. Yao, D. Mansur, R. Ellis, M. Machtay, and J.W. Sohn
      Quantitative Analysis Tools and Digital Phantoms for Deformable Image Registration Quality Assurance
      Technol. Cancer Res. Treat., DOI: 10.1177/1533034614553891, 2014.

    9. J. Yuan, Q. Chen, J. Brindle, Y. Zheng, J.W. Sohn, R. Ellis, M. Machtay, P. Geis and B. Wessels
      Investigation of nonuniform dose voxel geometry in Monte Carlo Calculation
      Technol. Cancer Res. Treat., DOI: 10.1177/1533034614547459, 2014.

    10. H. Kim*, J. Fabien, Y. Zhang, J. Yuan, J. I. Monroe, A. Sloan, M. Yao, S. Lo, B. Wessels, M. Machtay, S. Welford, and J.W. Sohn
      Establishing a Process of Irradiating Small Animal Brain Using a CyberKnife and a Micro-CT Scanner
      Med. Phys. 41(2):021715-1~021715-10 Feb. 2014.

    11. S.S. Lo, A. Loblaw, E.L. Chang, N.A. Mayr, B.S. Teh, Z. Huang, M. Yao, R.J. Ellis, T. Biswas, J.W. Sohn, M. Machtay, A. Sahgal
      Emerging applications of stereotactic body radiotherapy
      Future Oncol. 10(7): 1299-1310, 2014

    12. B. Berber, J.R. Sanabria, K. Braun, M. Yao, R.J. Ellis, C.A. Kunos, J.W. Sohn, M. Machtay, B.S. Teh, Z. Huang, N.A. Mayr, S.S. Lo
      Emerging role of stereotactic body radiotherapy in the treatment of pancreatic cancer
      Expert Rev. Anticancer Ther. 13(4):481-7, 2013.

    13. K. Shiue**, A. Song, B. S. Teh, R. J. Ellis, M. Yao, N. A. Mayr, Z. Huang, J.W. Sohn, M. Machtay, S. S. Lo
      Stereotactic body radiation therapy (SBRT) for metastasis to the adrenal gland
      Expert Rev. Anticancer Ther. 12(12): 1613-1620, 2012.

    14. H. Kim*, S.B. Park, J.I. Monroe, S. Lo, J.W. Sohn
      Bidirectional local distance measure for comparing segmentations
      Med. Phys. 39(11): 6779-6790, 2012.

    15. C. Woods+, J.W. Sohn, M. Machtay, M. Yao
      Radiation Treatment Planning for Head and Neck Cancer with Positron Emission Tomography
      PET Clinics, Vol. 7: 395-410, 2012.

    16. S. B. Park, J. I. Monroe, M. Yao, M. Machtay, and J. W. Sohn
      Composite Radiation Dose Representation Using Fuzzy Set
      Information Sciences, Vol. 187, pp. 204-215, Mar 2012

    17. C. Woods, J.W. Sohn, M. Yao
      The Application of Positron Emission Tomography in Radiation Treatment Planning for Head and Neck Cancer
      PET Clinics, Vol. 6, pp. 149-163, 2011

    18. S.B. Park, F. Rhee, J.I. Monroe and J.W. Sohn
      Spatially Weighted Mutual Information Image Registration for Image Guided Radiation Therapy
      Medical Physics, vol. 37, no. 9, pp. 4590-4601, 2010

    19. S.B. Park, F. Rhee, and J.W. Sohn
      Spatially Weighted Mutual Information for Image Registration
      Journal of Engineering and Technology, vol. 18, pp. 23-31, 2008

    20. J.W. Sohn, D. Mansur, J.I. Monroe, R.E. Drzymala, H. Jin, T. Suk, J. Dempsey, E. Klein
      Automated EPID analysis of breast intrafractional and interfractional positioning error
      Korean Medical Physics journal, 17(1): 24-31, 2006

    21. A.V. Chevtsov, D. Calvetti, J.W. Sohn, T.J. Kinsella
      Regularization of inverse planning for intensity-modulated radiotherapy.
      Med. Phys. 32(2): 501-514, 2005

    22. M.S. Huq, J.W. Sohn, W.R. Hendee
      Over the foreseeable future, the growth in technical complexity of radiation therapy will continue to drive
      the demand for more medical physicists
      Med. Phys. 31(11): 2939-2941, 2004

    23. J.W. Sohn, J. F. Dempsey, Tae S. Suh, D.A. Low
      Analysis of Various Beamlet Sizes for IMRT with 6MV Photons
      Med. Phys. 30(9): 2432-2439, 2003

    24. D.A. Low, J.F. Dempsey, J. Markman, S. Mutic, E.E. Klein, J.W. Sohn, and J. A. Purdy
      Towards automated quality assurance for intensity-modulated radiation therapy.
      Int. J. Radiat. Oncol. Biol. Phys., 53(2): 443-452, 2001.

    25. D.A. Low, J.W. Sohn, E.E. Klein, J. Markman, S. Mutic, and J.F. Dempsey
      Characterization of a Commercial Multileaf Collimator Used for Intensity Modulated Radiation Therapy.
      Med. Phys. Vol. 28(5): 752-756, 2001.

    26. R.E. Drzymala, J.W. Sohn, C. Guo, L. G. Sobotka, and J.A. Purdy
      Angular Measurement of the Cobalt-60 Emitted Radiation Spectrum From a Radiosurgery Irradiator.
      Med. Phys. Vol. 28(4): 620-628, 2001.

    27. E.E. Klein, D.A. Low, J.W. Sohn, J.A. Purdy
      Differential Dosing of Prostate and Seminal Vesicles Using Dynamic Multileaf Collimation.
      Int. J. Radiat. Oncol. Biol. Phys., Vol. 48: 1447-1456, 2000.

    28. J.H. Suh, G.H. Barnett, J.W. Sohn, P.A. Kupelian, Bruce H. Cohen
      Results of Linear Accelerator-Based Stereotactic Radiosurgery for Recurrent and Newly Diagnosed
      Acoustic Neuromas
      Radiat. Oncol. Invest. 90: 145-151, 2000.

    29. R.M. Macklis, R.L. Crownover, J. Crowe, T. Willoughby, J.W. Sohn
      Reducing Scatter Radiation to the Contralateral Breast With a Mobile, Conformal Shield
      During Breast Cancer Radiotherapy
      Am. J. Clin. Oncol. Vol. 22: 419-425, 1999

    30. J.W. Sohn, R.M. Macklis, J.H. Suh, P.A. Kupelian
      A Mobile Shield to Reduce Scatter Radiation to the Contralateral Breast During Radiotherapy
      for Breast Cancer: Preclinical Results
      Int. J. Radiat. Oncol. Biol. Phys. Vol. 43: 1037-1041, 1999

    31. J.H. Suh, G.H. Barnett, D. Miller, J.W. Sohn, E. Fernandez-Vicioso, P.A. Kupelian
      Results of Patients with Newly Diagnosed Single Brain Metastasis Treated with Stereotactic Radiosurgery
      with or without Whole Brain Radiation Therapy
      Radiosurgery, Vol. 2: 51-63, 1998

    32. E. Fernandez-Vicioso, J.H. Suh, P.A. Kupelian, J.W. Sohn, G.H. Barnett
      Analysis of Prognostic Factors for Patients with Single Brain Metastasis Treated with Stereotactic Radiosurgery
      Radiat. Oncol. Invest., Vol. 5: 31-37, 1997

    33. J. Katcher, P.A. Kupelian, C. Zippe, E.A. Klein, J.W. Sohn
      Indications for Excluding the Seminal Vesicles when Treating Clinically Localized Prostatic Adenocarcinoma
      with Radiotherapy Alone
      Int. J. Radiat. Oncol. Biol. Phys., Vol. 37: 871-876, 1997

    34. C.E. DeMagri, J.W. Sohn, V. Smith, A. Perec, D.A. Larson, M.C. Schell
      Method of Developing an Interlock System for Linac-Based Stereotactic Radiosurgery
      Radiat. Oncol. Invest., Vol. 4: 287-291, 1996

    35. S. Pohar, J.W. Sohn, S. Esposito
      A Comparison of Two Techniques Used to Reduce Mandibular Dose in Oral Cavity Interstitial Brachytherapy
      Endocurietherapy / Hyperthermia Oncology Int. Journal, Vol. 12: 159-164,1996

    36. J.W. Sohn, J.G. Dalzell, J.H. Suh, M. Tefft, M.C. Schell
      Dose Volume Histogram Analysis of Techniques for Irradiating Pituitary Adenomas
      Int. J. Radiat. Oncol. Biol. Phys., Vol. 32: 831-837, 1995

    37. J.W. Sohn, J.H. Suh, S. Pohar
      A Method for Delivering Accurate and Uniform Radiation Dosages to the Head and Neck with Asymmetric Collimators
      and a Single Isocenter
      Int. J. Radiat. Oncol. Biol. Phys., Vol. 32: 809-813, 1995

    38. Correspondence: In response to Dr. Harari
      Int. J. Radiat. Oncol. Biol. Phys., Vol. 33: 972, 1995

    39. P.D. Higgins, J.W. Sohn, R. Fine, M.C. Schell
      3-D Conformal Pancreas Treatment: Comparison of 4 to 6 Field Techniques
      Int. J. Radiat. Oncol. Biol. Phys., Vol. 31: 605-609, 1995

    40. P.D. Higgins, C.H. Sibata, L. Siskind, J.W. Sohn
      Deconvolution of detector size effect for small field measurement
      Med. Phys., Vol. 22(10):1663-1666, 1995

    41. J.W. Sohn, M.C. Schell, K.K. Dass, J.H. Suh, M. Tefft
      Uniform Irradiation of the Craniospinal Axis with a Penumbra Modifier and an Asymmetric Collimator
      Int. J. Radiat. Oncol. Biol. Phys., Vol. 29:187-190, 1994

    42. M.A. Holmes, T.R. Mackie, J.W. Sohn, P.J. Reckwerdt, T.J. Kinsella, A.F. Bielajew, D.W.O. Rogers
      The Application of Correlated Sampling to the Computation of Electron Beam Dose Distributions in Heterogeneous
      Phantoms using the Monte Carlo Method
      Phys. in Med. & Biol., Vol. 38:675-688, 1993

    43. P.D. Higgins, J.W. Sohn, C.H. Sibata, W.A. McCarthy
      Scatter Factor Correlations for Elongated Fields
      Med. Phys., Vol. 16(5):800-806, 1989

    last modified 2016-05-25 10:41:56
    © 2012, Radiation Physics and Engineering Lab. Case Western Reserve University
    Cleveland, Ohio 44106 | Phone: 216-368-6583 |