Journal
JOURNAL OF NEURAL ENGINEERING
Volume 18, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-2552/abe099
Keywords
deep brain stimulation; MEG; SQUID; directional DBS electrode; magnetic field measurement; electrode localization; rotational orientation detection
Categories
Funding
- German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) through the Project T1 of the Collaborative Research Centre CRC 1261 Magnetoelectric Sensors: From Composite Materials to Biomagnetic Diagnostics
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The study aimed to investigate the accuracy of localization and rotational orientation detection of a directional DBS electrode using a state-of-the-art MEG scanner. Results showed that the electrode was localized with a mean accuracy of 2.2 mm and orientation was determined with a mean accuracy of 11 degrees, limited by the measurement precision of the MEG system. A future magnetic measuring system with higher precision may further improve accuracy in detecting location and orientation of a DBS electrode.
Objective. The aim of the present study was to investigate the accuracy of localization and rotational orientation detection of a directional deep brain stimulation (DBS) electrode using a state-of-the-art magnetoencephalography (MEG) scanner. Approach. A directional DBS electrode along with its stimulator was integrated into a head phantom and placed inside the MEG sensor array. The electrode was comprised of six directional and two omnidirectional contacts. Measurements were performed while stimulating with different contacts and parameters in the phantom. Finite element modeling and fitting approach were used to compute electrode position and orientation. Main results. The electrode was localized with a mean accuracy of 2.2 mm while orientation was determined with a mean accuracy of 11. The limitation in detection accuracy was due to the lower measurement precision of the MEG system. Considering an ideal measurement condition, these values represent the lower bound of accuracy that can be achieved in patients. Significance. However, a future magnetic measuring system with higher precision will potentially detect location and orientation of a DBS electrode with an even greater accuracy.
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