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Effect of the extracranial deep brain stimulation lead on radiofrequency heating at 9.4 Tesla (400.2 MHz)
Author(s) -
Shrivastava Devashish,
Abosch Aviva,
Hanson Timothy,
Tian Jinfeng,
Gupte Akshay,
Iaizzo Paul A.,
Vaughan J. Thomas
Publication year - 2010
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.22292
Subject(s) - electromagnetic coil , specific absorption rate , head (geology) , radiofrequency coil , lead (geology) , dielectric heating , materials science , deep brain stimulation , azimuth , nuclear magnetic resonance , nuclear medicine , electrode , radio frequency , biomedical engineering , medicine , physics , optics , optoelectronics , geology , telecommunications , computer science , antenna (radio) , disease , pathology , quantum mechanics , geomorphology , parkinson's disease , dielectric
Purpose: To study the effect of the extracranial portion of a deep brain stimulation (DBS) lead on radiofrequency (RF) heating with a transmit and receive 9.4 Tesla head coil. Materials and Methods: The RF heating was studied in four excised porcine heads (mean animal head weight = 5.46 ± 0.14 kg) for each of the following two extracranial DBS lead orientations: one, parallel to the coil axial direction; two, perpendicular to the coil axial direction (i.e., azimuthal). Temperatures were measured using fluoroptic probes at four locations: one, scalp; two, near the second DBS lead electrode‐brain contact; three, near the distal tip of the DBS lead; and four, air surrounding the head. A continuous wave RF power was delivered to each head for 15 min using the coil. Net, delivered RF power was measured at the coil (mean whole head average specific absorption rate = 2.94 ± 0.08 W/kg). Results: RF heating was significantly reduced when the extracranial DBS lead was placed in the axial direction (temperature change = 0–5°C) compared with the azimuthal direction (temperature change = 1–27°C). Conclusion: Development of protocols seems feasible to keep RF heating near DBS electrodes clinically safe during ultra‐high field head imaging. J. Magn. Reson. Imaging 2010;32:600–607. © 2010 Wiley‐Liss, Inc.