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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