OMPI Seminar: Mathew Efseaff and Ran Klein

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Thursday, May 24, 2018

Time: 3:30 - 5:00 pm, Refreshments start at 3:15 pm.

Location: NRC - 1200 Montreal Road, Building M-36 - Kelvin Room (please check in at the front desk).

 As usual, the end-of-season BBQ will start after the seminars, ~5 pm. If you plan on attending the BBQ please RSVP to Byran Muir so that the NRC folks get an idea of how much food to prepare. Deadline for RSVP is May 21st. Also if you have any dietary restrictions, please let Bryan know.


1Evaluating the accuracy of a general cavity theory

by Matthew Efseaff, PhD student, Carleton University

Supervisors: Dr. Miller MacPherson and Dr. Dan La Russa

Abstract: In radiation dosimetry protocols, the primary objective is to derive the absorbed dose in an irradiated medium, Dmed, from the dose to a detector placed in that medium, Ddet. The relationship between Dmed and Ddet is determined from cavity theory, whose formulation has traditionally depended on the nature of the radiation source, detector, and geometry (including field size, material combinations, etc). In this presentation, a general cavity theory will be introduced that has potential applications over a wide range of incident energies and detector types, making it a suitable candidate for the growing landscape of radiation devices not encompassed by existing dosimetry protocols, or to augment protocols currently in use. The approach to evaluating the accuracy of this general cavity theory using Monte Carlo methods (EGSnrc) will be presented along with preliminary results.


2) Squeezing medical insight out of photons

by Ran Klein, PhD Elec Eng, The Ottawa Hospital, Nuclear Medicine Department.

Abstract: The quality of medical exams and the quality of their interpretation can limit the precision of the indications derived from these exams and hence limit appropriate patient care. A holistic approach towards quality is essential for optimal patient care and is the primary responsibility of medical physicists. This presentation will highlight potential sources of error in nuclear medicine tests and describe some of the approaches being applied at The Ottawa Hospital to improve quality at all stages of the medical procedure. Past, current and future research projects relating to quality in the Nuclear Medicine Department will be described.