Nuclear Medicine

Photograph of Ame Shammas

Dr. Amer Shammas - Divisional Lead

The Division of Nuclear Medicine comprises faculty members from university-affiliated teaching hospitals of the University of Toronto including The Hospital for Sick Children, Sunnybrook Health Sciences Centre (SHSC), St. Michael's Hospital (SMH), and Joint Department of Medical Imaging (JDMI) at Mount Sinai Hospital (MSH), Women’s College Hospital (WCH), and the University Health Network (UHN -- Toronto General Hospital, Princess Margaret Cancer Centre, and Toronto Western Hospital).

Nuclear Medicine Education

Nuclear Medicine Research

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Sunnybrook Health Sciences Centre

Sunnybrook Health Sciences Centre (SHSC) offer a wide range of Nuclear Medicine diagnostic imaging and Theranostics including combination PET diagnostics + Lu-177 therapeutics for neuroendocrine and prostate cancer. They offer expanded cardiac care services including low-dose CZT SPECT for myocardial perfusion imaging, Pyrophosphate imaging for amyloid workup, and cardiac FDG PET. Our faculty members are collaborating with the Augmented Precision Medicine (APM) lab, which is a lab dedicated to precision medicine and the use of artificial intelligence in medical imaging, such as low-dose PET reconstruction techniques, and working on AI/Machine Learning research initiatives.

Joint Department of Diagnostic Imaging (JDMI)/UHN

JDMI at all sites provides clinical and academic services performing more than 950 general nuclear medicine cases and more than 400 PET scans monthly. The high volume and diverse case mix provide exceptional exposure to complex cases at the medical student, resident, or fellowship level. With a variety of learners rotating through the department, there is exposure to daily 'hands-on' molecular imaging teaching as well as monthly rounds for trainees as part of their exam preparation. Each of our physician staff provides mentorship for trainees from medical student to residents and have received numerous teaching awards. The case complexity drives innovative solutions with radiopharmaceuticals and imaging techniques. As an example, particular expertise has been developed using SPECT/CT Lymphoscintigraphy to identify chylous leaks, and for lymph node mapping in malignancies. At any given time, there are multiple clinical trials that are pushing the boundaries of diagnostics (such as PSMA) and therapy (Radium 223). There are currently more than 30 active research projects in the Division with trainees integrated with most. These include research on PET/CT and PET/MR in multiple malignancies, with various tracers assessing metabolism, hypoxia, receptor expression among others, as well as non-oncological research on topics including transplant graft evaluation, peripheral artery disease, and rheumatoid arthritis.  

The Hospital for Sick Children

The Hospital for Sick Children is internationally recognized for pediatrics.

At SickKids, nuclear medicine, provides complete clinical service for children including conventional nuclear medicine, PET/CT, DXA, HRpQCT, and radionuclide therapy. Unique and new techniques have been established such as Mucociliary scintigraphy, semi-quantitative method of bowel transit study, and the ictal and interictal studies. The exceptional radionuclide therapy unit provides Radioiodine and MIBG therapy for children as well as other innovative radionuclide therapy under clinical trials for variable pediatric oncology patients in Ontario and out-of-province patients. Image Gently and patient safety is one of the top priorities, achieving high-quality imaging with a lower dose. The Nuclear Medicine team at SickKids including physicians and technologists are very active in teaching providing unique experience and training to students, residents, and fellows from the University of Toronto and other Universities. The Pediatric Nuclear Medicine team is also active in research and constantly presenting in international annual meetings and publish in major Nuclear Medicine Journals.

St. Michael's Hospital/Unity Health

St. Michael’s Hospital, part of Unity Health Toronto, is an urban academic teaching hospital, tertiary/quaternary referral center, and regional trauma center.  The Nuclear Medicine Division at St. Michael’s Hospital performs a broad range of general nuclear medicine procedures allowing for a fulsome experience for trainees.  Additionally, the excellent collaborative relationships that exist with Cardiology (Nuclear Cardiology) and Endocrinology/ Rheumatology (Bone Mineral Densitometry) foster multidisciplinary dialogue in these areas.  A PET/CT program, which is currently in development, will further round out the breadth of the trainees’ experience.


The program offers a two-year position with nuclear medicine in the PGY 6 & 7 years following the Diagnostic Radiology residency program to residents who have completed the Royal College of Canada accredited residency and certification exam in Diagnostic Radiology. The program enables the resident to combine both Nuclear Medicine and Radiology training in preparation for rapidly expanding hybrid and fused imaging techniques and for their future career. 

During the two-year program, the residents will have an opportunity to learn a wide variety of Nuclear Medicine imaging techniques and procedures as well as Radionuclide therapy within our affiliated teaching sites, and community hospitals accompanied by structured teaching rounds during academic half day (AHD). The large number and variety of procedures performed in each hospital allow the residents broad exposure to nuclear medicine specialty.

The program underwent a Royal College Review and received the status of full accreditation with follow-up at regular review. In July 2020, Nuclear Medicine Program has been able to successfully implement Competence by Design (CBD) curriculum as required by the Royal College of Physicians and Surgeons of Canada.

For more information go to the Nuclear Medicine Resident Program Webpage


Our enthusiastic Nuclear Medicine faculty is committed to teaching, supporting and mentoring throughout the Residency training. Also, the residents receive excellent training in basic sciences, including courses in Physics and Radiopharmacy. Our faculty members actively participate in teaching at the fellowship, resident, and undergraduate levels and contribute to many CME programs. Our faculty are also active in teaching Radiology Residents who rotate in Nuclear Medicine and participate in a lecture series in AHD.

Our residents are encouraged to actively partake in teaching and research and to attend the many teaching rounds, lectures, and Journal Club. 


Our faculty in all sites present their research work regularly at international conferences and have it published in peer-reviewed journals, often with collaboration from residents or fellows. They also contribute chapters to textbooks, related to Nuclear Medicine. For example, at UHN since 2018, over 100 manuscripts have been published in peer-reviewed journals and have been presented in the leading society meetings.