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Abstract #0246

The Effects of Spatial Sampling Choices on MR Temperature Measurements

Nick Todd1, Josh De Bever2, Urvi Vyas3, Allison Payne4, Dennis L. Parker5

1Physics, University of Utah, Salt Lake City, UT, United States; 2Robotics, University of Utah, Salt Lake City, UT, United States; 3Bioengineering, University of Utah, Salt Lake City, UT, United States; 4Mechanical Engineering, University of Utah, Salt Lake City, UT, United States; 5Radiology, University of Utah, Salt Lake City, UT, United States


MR temperature maps are necessarily a discrete representation of a physical quantity that is continuously varying in both space and time. The HIFU focal spot size can be smaller than the imaging voxel dimensions. Due to averaging effects, it is likely that different choices for the sampling grid location, voxel size, and scan time will lead to variations in the measured temperature distribution. In this abstract we present simulation and experimental results quantifying the effects of the sampling scheme on maximum temperature and thermal dose, and show the effects of zero-filled-interpolation post-processing on the measured maximum temperature and thermal dose.