60603-Njeh, Christopher

Christopher Njeh, PhD

Associate Professor of Radiation Oncology

Email cnjeh@iu.edu
535 Barnhill Drive, Suite RT 041

Indianapolis, IN 46202


Christopher Njeh, Ph.D. is a graduate of Birmingham University, Aberdeen University and Sheffield Hallam University, UK.  He started his professional career at the Addenbrooke’s Hospital in Cambridge and Queen Elizabeth’s Hospital, Birmingham, UK.  He later joined the Osteoporosis and Arthritis Research Group (OARG) of the Department of Radiology at the University of California, San Francisco as a Visiting Postdoctoral Fellow where he was subsequently appointed as Assistant Professor. Dr. Njeh transitioned to therapeutic medical physics by completing a medical physics residency at Johns Hopkins University, Baltimore. He has since served as Chief Medical Physicist at Texas Oncology in Tyler, TX and held an adjunct faculty positions at the University of Texas at Tyler, and California State University Fresno. He was the Chief Medical Physicist and Radiation Safety Officer at Franciscan Health, Indianapolis, Indiana before accepting the position at Indiana University. Dr Njeh is also an adjunct faculty at the University of Kentucky. Dr. Njeh is certified in Therapeutic Medical Physics by the American Board of Radiology. His major research interests include Osteoporosis, image-guided radiation therapy and accelerated partial breast irradiation. He is author or co-author of over 65 peer reviewed journal articles and 10 book chapters, and is co-editor of two books. He is an ad hoc article reviewer for many journals and an Associate Editor of the British Journal of Radiology and a Fellow of the American Association of Physicists in Medicine (AAPM). Dr Njeh is the current president of the Ohio River Valley Chapter of AAPM.

Key Publications

Publications: (Recent Publications)

  1. Njeh CF. Tumor delineation: The weakest link in the search for accuracy in radiotherapy. J Med Phys. 2008 Oct;33(4):136-40.
  1. Langton CM, Njeh CF. The measurement of broadband ultrasonic attenuation in cancellous bone--a review of the science and technology. IEEE Trans Ultrason Ferroelectr Freq Control. 2008 Jul;55(7):1546-54.
  1. Njeh CF, Rashid A, Orton CG. Point/Counterpoint. Radiation departments should be certified to provide certain new technologies such as IGRT. Med Phys. 2009 Dec;36(12):5377-9.
  1. Njeh CF, Raines TW, Saunders MW. Determination of the photon beam attenuation by the Brainlab imaging couch: angular and field size dependence. J Appl Clin Med Phys. 2009;10(3):2979.
  1. Njeh CF, Saunders MW, Langton CM. Accelerated Partial Breast Irradiation (APBI): A review of available techniques. Radiat Oncol. 2010;5:90.
  1. Njeh CF, Langton, CM, Orton CG. Point/Counterpoint, The adoption of new technology in radiation oncology should rely on evidence-based medicine. Medical Physics, 2011; 38, 2825
  1. Njeh CF, Saunders MW, Langton CM. Accelerated partial breast irradiation using external beam conformal radiation therapy: a review. Crit Rev Oncol Hematol. 2011; 81(1): 1-20
  1. Njeh CF, Caroprese, B and Desai P. A simple quality assurance test tool for the visual verification of light and radiation field congruent using electronic portal images device and computed radiography. Radiation Oncology 2012, 7:49
  1. Njeh CF, Parker J, Spurgin J, Rhoe E, A validation of carbon fiber imaging couch top modeling in two radiation therapy treatment planning systems: Philips Pinnacle3 and BrainLAB iPlan RT Dose. Radiation Oncology, 2012, 7:190
  1. Das IJ, Njeh CF, Orton CG. Point/Counterpoint: Vendor provided machine data should never be used as a substitute for fully commissioning a linear accelerator. Medical Physics 2012: 39, 569.
  1. Njeh CF, Dong L, Orton CG. Point/Counterpoint: IGRT has limited clinical value due to lack of accurate tumor delineation. Medical Physics  2013: 2013 Apr;40(4):040601.
  1. Njeh CF, Enhanced dynamic wedge output factors for Varian 2300CD and the case for a reference database. . J Appl Clin Med Phys. 2015 16( 5), 2015
  1. CF Njeh, R Stankowski, H Liang, B Obesity as a Factor in Prostate Cancer Treatment Modality and Outcomes. Brachytherapy, 2015; 14: S51 
  1. CF Njeh, BC Parker, CG Orton. Point/Counterpoint: Evaluation of treatment plans using target and normal tissue DVHs is no longer appropriate. Medical Physics; 2015: 42(5): 2099- 2102.
  1. CF Njeh, TS Suh, CG Orton. Point/Counterpoint: Radiotherapy using hard wedges is no longer appropriate and should be discontinued. Medical Physics; 2016, 43(3):1031-1034.
  1. CF Njeh, HW Salmon, C Schiller. The impact of dose rate on the accuracy of step-and-shoot intensity-modulated radiation therapy quality assurance using Varian 2300CD. Journal of medical physics, 2017, 42(4): 206-212.
  1. CF Njeh, BC Parker, CG Orton. Implanted fiducial markers are no longer needed for prostate cancer radiotherapy. Medical Physics, 2017, 44(12); 6113-6116
  1. CF Njeh, KC Snyder, J Cai. The use of six degrees of freedom couch is only clinically beneficial in stereotactic radio surgery. Medical Physics, 2018, 46(2); 415-418
  1. CF Njeh, MS Silosky, G White. As part of Maintenance of Certification (MOC), all clinical medical physicists should be expected to periodically demonstrate some clinical research in the form of meeting presentations and published articles. Medical Physics. 2020, 48(2):542-545
  1. Njeh CF, Hans, D, Glueer CC, Fuerst T and Genant HK (Editors)

Quantitative ultrasound: Assessment of Osteoporosis and Bone Status, Martin Dunitz Ltd, London, 1999  

  1. Langton C. M., Njeh C.F (Editors)

Physical measurement of bone. Institute of Physics, Bristol, UK, 2004.

Titles & Appointments

  • Associate Professor of Radiation Oncology
  • Education
    2002 Residency Johns Hopkins University
    2000 Fellowship University of California, San Francisco
    1995 PhD Sheffield Hallam University
    1990 MSC University of Aberdeen
    1989 BSC University of Birmingham
  • Research
    Dr Njeh’s major research interests include Osteoporosis, image-guided radiation therapy and accelerated partial breast irradiation. In external beam radiation therapy Dr Njeh is interested in the variables that influence the precision of the delivery of the radiation dose
  • Professional Organizations
    American Association of Physicists in Medicine (AAPM)
    American Society for Radiation Oncology(ASTRO)
  • Board Certifications
    American Board of Radiology - Medical Physics*
  • Clinical Interests
    Dr Njeh is interested in all aspects of clinical medical physics as applied to radiation therapy. This includes: external beam radiation therapy, Stereotactic radiosurgery (SRS), stereotactic body radiation therapy (SBRT), total body irradiation (TBI), brachytherapy, radiopharmaceutical therapy (Yttrium-90,  radium-223 (xofigo)) and radioactive eye plaques treatment of choroidal melanoma
  • Awards
    Org: American Association of Physicists in Medicine
    Desc: Fellow
    Scope: International
    Org: International Society for Clinical Densitometry
    Desc: Best Clinician Poster
    Scope: International

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