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Michael Joy, M.A.Sc., PhD

Affiliate scientist

Institute of Biomaterials & Biomedical Engineering
Rosebrugh Building, Room 407
164 College Street
Toronto, ON
M5S 3G9

Phone: 416-978-6538
Fax: 416-978-4317


  • B.A.Sc., 1963, Physics, University of Toronto, Canada
  • M.A.Sc., 1967, Electrical Engineering, University of Toronto, Canada
  • PhD, 1970, Biomedical Engineering, University of Toronto, Canada

Appointments and Affiliations:

  • Affiliate scientist, Physical Sciences, Schulich Heart Research Program, Sunnybrook Research Institute
  • Professor, department of electrical and computer engineering, Institute of Biomaterials and Biomedical Engineering, University of Toronto
  • Associate director (graduate studies), Institute of Biomaterials and Biomedical Engineering, University of Toronto
  • Chair, BME Research Group, department of electrical and computer engineering

Research Foci:

  • MRI current density
  • Impedance imaging

Research Summary:

Current density imaging (CDI) is an imaging technique that measures electrical current density distributions in a volume of material/tissue, which can be imaged using magnetic resonance imaging (MRI). Current density imaging is performed by applying an external current to the material/tissue during an MRI acquisition, the magnetic fields produced by the applied current are mapped onto the phase image of the MRI acquisition. The phase images are processed to compute the current density distribution. Performing CDI requires an MRI system, additional hardware, a modified pulse sequence (PSD) and data processing software.

CDI was developed by Greig C. Scott, Michael L.G. Joy and R. Mark Henkelman in 1988 at the University of Toronto (Canada). The CDI Research Group is presently based at the University of Toronto and is supervised by Michael L.G. Joy.

More Information:

  • Pioneering research in the measurement of electric currents with MRI (CDI).
  • PhD student, Greig Scott, won Young Investigator award of the ISMRI for work on CDI.
  • Peer-reviewed funding from the Medical Research Council of Canada and Natural Sciences and Engineering Research Council of Canada.
  • Five papers and nine abstracts reviewed and published over the last five years and one patent.
  • Growing international interest in CDI is demonstrated by invitations to speak to industry and university audiences, by collaborations with several international universities and by numerous visitors wishing to learn CDI techniques.
  • Interest in translating basic research into practice is demonstrated by funded collaborations with researchers in the private sector.

Selected Publications:

See current publications list at PubMed.

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