MR thermometry of frozen tissue using signal intensity: a feasibility study at 11.7T

Our study investigates the relation between MR signal intensity and tissue temperature using ultrashort TE imaging and demonstrates feasibility of a high-resolution MR temperature map of frozen tissue at 11.7T. For subzero temperatures, the signal decay is fitted by SI = 0.47e ^0.04T +1.16e ^0.24T . Mean temperature error of the fit is 3.9C. Using the fit, SI values are converted to temperatures to construct temperature maps of the frozen tissue. MR thermometry of frozen tissue using signal intensity is feasible, allowing assessment of temperatures within the cryoablation iceball as low as -40C. Further work into the accuracy and consistency of this method is required.

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