Gradient dB/dt Heating Measurements of Copper, Steel, and Titanium Annuli: Assessment of Measurement Repeatability, and Identification of a Potential Reference Standard

The purpose of this work is to develop a simple reference standard to be used for gradient-induced heating tests to verify test system operation. A second objective is to provide data on measurement repeatability of heating in these reference objects. Two different dB/dt exposures (270 Hz and 1000 Hz) were used to measure the gradient-induced temperature rise of three MRI compatible metals using a laboratory dB/dt exposure system. Based on the temperature rise, an MRI compatible metal of distinct dimensions and geometry was determined to be most suitable as a dB/dt heating standard across a frequency range of 270-1000 Hz.