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Abstract #2772

Difficulties Associated with Aligning Simulated and Constructed Coils

Leeor Alon1, 2, Cem Murat Deniz1, 2, Ryan Brown1, Daniel Sodickson1, 2, Yudong Zhu1, 2

1Department of Radiology, Bernard and Irene Schwartz Center for Biomedical Imaging, New York University, New York, NY, United States; 2Sackler Institute of Graduate Biomedical Sciences, New York University, New York, NY, United States

In Magnetic Resonance Imaging, local and global specific absorption rates (SAR) are metrics needed to ensure patient safety. Even though global SAR can be effectively monitored in-vivo for single and multi-channel transmit systems, local SAR is much harder to assess. Often, Local SAR estimation utilizes numerical simulation software to model particular coil setups and calculate the electromagnetic fields associated with the simulated coil setups. In this work, it is shown that even relatively slight inaccuracies in the modeled coil geometry could significantly alter the E field and SAR distribution while leaving the maximum B1+ field change relatively unperturbed. This alteration of the E field and SAR distribution are also seen to increase with field strength, suggesting possible shortcomings of using simulation software and comparing the B1+ maps of simulations and experiments to account for RF safety of coil arrays.

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Keywords

abdominal absorbed absorption abstract account accurately actual aligning altered although arrays assumptions available axial bars biomedical birdcage black body brown calculating capacitors carrier certain classical coil coils commercially complex component components computed conducted constructed coupled defined density design detail development deviation difficult distribution distributions drawbacks edition efforts electrodynamics error errors evaluate evaluation exactly example experiment exported exposed extent field fields finite forced frequencies full generated geometry graduate grid human hypothetical illustrates inaccurate institute isotropic known leaving local made many maps maxwell measure measuring mesh might mismatch model modeled needs norm numerical occur original path patterns percent perfect performance perturbation physical placed plots positioned positioning post prediction prevent produces quantifiable radiology readily regard regarding relied relying resolution safety scanner sciences setup setups simple simulate simulated simulating simulation simulations since slice software source specifically strength strengths structure structures subject subjects suggesting surface track transmit true truly ultra unperturbed utilizes versa version wave wires