Manushka V. Vaidya1,2,3, Christopher M. Collins1,2,3, Daniel K. Sodickson1,2,3, Giuseppe Carluccio1,2, and Riccardo Lattanzi1,2,3
1Center for Advanced Imaging Innovation and Research (CAI2R), Department of Radiology, New York University School of Medicine, New York, NY, United States, 2Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, NY, United States, 3Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, NY, United States
There is no single mechanism to describe how high permittivity materials (HPMs)
improve signal-to-noise ratio when placed between radiofrequency coils and the
object. We separately investigated the effects of HPMs on signal propagation
and sample noise by studying ideal current patterns, the corresponding optimal electric
(E) field and a signal-only
propagation model. Our results suggest that phase changes in the ideal current
patterns with HPMs are primarily due to signal-propagation effects while their
increase in size is due to reduced E
field penetration into the sample, which allows larger current patterns that
maximize signal reception with a limited noise penalty.
