MR imaging-related heating of deep brain stimulation electrodes: in vitro study.
Publication/Presentation Date
1-1-2002
Abstract
BACKGROUND AND PURPOSE: Recent work has shown a potential for excessive heating of deep brain stimulation electrodes during MR imaging. This in vitro study investigates the relationship between electrode heating and the specific absorption rate (SAR) of several MR images.
METHODS: In vitro testing was performed by using a 1.5-T MR imaging system and a head transmit-receive coil, with bilateral deep brain stimulation systems positioned in a gel saline-filled phantom, and temperature monitoring with a fluoroptic thermometry system. Standardized fast spin-echo sequences were performed over a range of high, medium, and low SAR values. Several additional, clinically important MR imaging techniques, including 3D magnetization prepared rapid acquisition gradient-echo imaging, echo-planar imaging, quantitative magnetization transfer imaging, and magnetization transfer-suppressed MR angiography, were also tested by using typical parameters.
RESULTS: A significant, highly linear relationship between SAR and electrode heating was found, with the temperature elevation being approximately 0.9 times the local SAR value. Minor temperature elevations, < 1 degrees C, were found with the fast spin-echo, magnetization prepared rapid acquisition gradient-echo, and echo-planar clinical imaging sequences. The high dB/dt echo-planar imaging sequence had no significant heating independent of SAR considerations. Sequences with magnetization transfer pulses produced temperature elevations in the 1.0 to 2.0 degrees C range, which was less than theoretically predicted for the relatively high SAR values.
CONCLUSION: A potential exists for excessive MR imaging-related heating in patients with deep brain stimulation electrodes; however, the temperature increases are linearly related to SAR values. Clinical imaging sequences that are associated with tolerable temperature elevations in the
Volume
23
Issue
10
First Page
1795
Last Page
1802
ISSN
0195-6108
Published In/Presented At
Finelli, D. A., Rezai, A. R., Ruggieri, P. M., Tkach, J. A., Nyenhuis, J. A., Hrdlicka, G., Sharan, A., Gonzalez-Martinez, J., Stypulkowski, P. H., & Shellock, F. G. (2002). MR imaging-related heating of deep brain stimulation electrodes: in vitro study. AJNR. American journal of neuroradiology, 23(10), 1795–1802.
Disciplines
Business Administration, Management, and Operations | Health and Medical Administration | Management Sciences and Quantitative Methods
PubMedID
12427641
Department(s)
Administration and Leadership
Document Type
Article