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AJNR - American Journal of Neuroradiology

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MR Imaging-Related Heating of Deep Brain Stimulation Electrodes: In Vitro Study

Daniel A. Finelli^a, Ali R. Rezai^b, Paul M. Ruggieri^a, Jean A. Tkach^a, John A. Nyenhuis^c, Greg Hrdlicka^d, Ashwini Sharan^b, Jorge Gonzalez-Martinez^b, Paul H. Stypulkowski^d and Frank G. Shellock^e

^a Division of Radiology, Section of Stereotactic and Functional Neurosurgery, The Cleveland Clinic Foundation, Cleveland, OH
^b Neuroradiology Section, and the Division of Surgery, Section of Stereotactic and Functional Neurosurgery, The Cleveland Clinic Foundation, Cleveland, OH
^c Department of Computer and Electrical Engineering, Purdue University, West Lafayette, IN
^d Medtronic, Inc., Minneapolis, MN
^e Keck School of Medicine, Los Angeles, CA

View larger version (178K): [in a new window]   FIG 1. Phantom and experimental setup. Photograph shows the plexiglass phantom before filling with the gel saline solution shows the plastic grid frame and adjustable posts, which allow precise positioning and support of the dual implantable pulse generators, extensions, and DBS leads. The cables for the four fluoroptic thermometry probes are seen coursing off the bottom of the photograph.

View larger version (50K): [in a new window]   FIG 2. DBS lead mean temperature elevation as a function of local SAR. Plot shows greatest observed mean temperature elevation for 1 min of data collection, obtained at the time of peak heating during the 10- to 15-minute imaging time interval, versus local SAR value for single and multisection fast spin-echo images. Linear regression (all data points): r = 0.994, P < .001, x variable = 0.88, and y intercept = -0.13.