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Abstract #4618

An Investigation into the Origins of an MRI Artifact Induced by Increasing Temperature

Ryan T. Oglesby1,2, Wilfred W. Lam2, and Greg J. Stanisz1,2

1Medical Biophysics, University of Toronto, Toronto, ON, Canada, 2Physical Sciences, Sunnybrook Health Sciences Centre, Toronto, ON, Canada

An artifact has been observed in pure water samples after increasing the temperature above 25 °C, regardless of the heating mechanism. This study aims to determine the origins of the temperature-induced artifact by using MR thermometry and T1 relaxation to investigate samples containing increasing concentrations of agar. The addition of a small concentration (0.1%) of agar eliminates the temperature artifact suggesting that the increased viscosity of the samples decreases convection currents. Moreover, this addition of a small concentration of agar study provides a practical means of experimentally scanning samples at physiological temperature.

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