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Abstract #2836

Vascular Flow Effects on RF Heating of Passive Implants: The Use of a Flow Modified ASTM F2182 Phantom in a Siemens Tim Trio 3T Scanner

Alan Leewood1, David Gross1, Jeff Crompton2, Sergei Yushanov2, Orlando P. Simonetti3, Yu Ding3

1MED Institute, Inc., West Lafayette, IN, United States; 2AltaSim Technologies, LLC, Columbus, OH, United States; 3The Ohio State University, Columbus, OH, United States

MR safety of electrically conductive passive implants is directly related to localized heating of tissue when the device is subjected to RF powered E-fields. Current MR Safety methodology relies primarily on experimental methods (ASTM F2182), which use a gel phantom and produce conservative estimates of temperature rise for vascular devices due to lack of blood-flow. Ultimately, this raises the issue that clinically indicated MRI scans may be inappropriately withheld from patients because RF heating concerns were based on inappropriately conservative test methods. This work is an investigation of the effects of including vascular flow on the cooling of passive implants.

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Keywords

accordance accurate beyond blood body bore cell channel channels circulated circulating clinically close coil complex concerns conditions conductive configurations conservative considered containing contour convective cooling correlation coupled cylinder death device devices directly dynamics ends energy evaluated excellent expected experience experimental experimentally exposed fields flow flowing fluid fully function future gross heat heating history immersed implant implanted implants in vivo inappropriately include indicated inside investigates issue like likely limitations local located long many maximized measured media methodology minute minutes modeling modified often operating overly passing passive patient peak period phantom photo physiologically placed position powered predict predictions probes produced providing proximity pulse pump raises reduced reduction related relevant relies replace reported representing rise safety scanner schematic setups silicone simplified simulated simulation simulations situated software still strong subjected suggest system table technologies technology temperature temperatures thin tissue titanium transfer transient trio tube tubes typical ultimately utilized vascular viscosity visible visually wall walled water west whole