期刊
JOURNAL OF MAGNETIC RESONANCE IMAGING
卷 32, 期 3, 页码 600-607出版社
WILEY
DOI: 10.1002/jmri.22292
关键词
safety; MRI; RF heating; DBS; high field
资金
- National Institute of Health (NIH) [CA94318, EB0000895, CA94200, C06 RR12147, C06 RR17557, P41 RR08079, EB006835, EB007327]
- Keck Foundation
- National Center for Research Resources [5K12-RR03358-03]
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 degrees C) compared with the azimuthal direction (temperature change = 1-27 degrees C). Conclusion: Development of protocols seems feasible to keep RF heating near DBS electrodes clinically safe during ultra-high field head imaging.
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