Stephen BreenMSc, PhD
Assistant Professor

Contact Info

T. (416) 946-4501 Ext. 5421


Princess Margaret Cancer Centre
610 University Avenue
ON, M5G 2M9

Clinical Interests

Image-guided intensity-modulated radiotherapy of head and neck cancers, Positron emission tomography (PET) and single-photon emission computed tomography (SPECT) imaging in treatment planning, 4D imaging for treatment planning, Statistical process control in quality assurance, Quality management in radiation oncology


Please contact Faculty Member for more information


BEng, Engineering Physics, Technical University of Nova Scotia
MSc, University of Western Ontario
PhD, University of Western Ontario

Professional Memberships

Member, Canadian College of Physicists in Medicine


Assistant Professor, Department of Radiation Oncology, University of Toronto
Medical Physicist, Princess Margaret Hospital/University Health Network


Research Synopsis:

  • Online image guidance with conebeam CT for head and neck radiotherapy
  • Autosegmentation of CT images for radiotherapy treatment planning
  • Target volume delineation with PET-CT for radiotherapy treatment planning
  • Application of process control theory to quality control in radiotherapy

Publications and Awards

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