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Phantom Quantification of Magnetoencephalography Source Imaging Distortion Caused by Deep Brain Stimulation.

Saar Kariv¹, Jeong Woo Choi¹, Amy L Proskovec^2,3

¹Department of Neurological Surgery, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

|June 26, 2026

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Deep brain stimulation (DBS) artifacts minimally impact source-level magnetoencephalography (MEG) imaging. This study quantifies DBS effects on MEG dipole fitting, finding minimal distortion and stable head position indicator signals.

Area of Science:

Neuroscience
Biomedical Engineering
Medical Physics

Background:

Deep brain stimulation (DBS) is crucial for treating neurological disorders.
Magnetoencephalography (MEG) measures brain activity but can be affected by DBS artifacts.
Understanding DBS effects on source-level MEG analysis is critical for accurate neuroscientific interpretation.

Purpose of the Study:

To quantify the distortion of source-level MEG imaging caused by deep brain stimulation (DBS) artifacts.
To assess the impact of varying stimulation amplitude, electrode configuration, and proximity on DBS-related MEG distortions.
To evaluate the stability of head position indicator (HPI) coil signals during DBS.

Main Methods:

Utilized a phantom-based experimental setup to simulate DBS and MEG recordings.

Keywords:

DBS DBS artifacts DBS noise DBS-related artifacts MEG source imaging deep brain stimulation magnetoencephalography

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Systematically varied DBS stimulation amplitude (mA), electrode configuration, and dipole-DBS electrode distance.

Analyzed dipole-fitting accuracy (location, angle, amplitude) and HPI coil signal quality.

Main Results:

Dipole location, angle, and amplitude errors were modest across tested conditions.
Largest errors occurred at 5 mA ring-electrode stimulation (location/angle) and 15 mA (amplitude).
Error increased significantly with proximity to the DBS electrode; HPI signals remained stable.

Conclusions:

DBS stimulation itself does not significantly impair MEG dipole estimation accuracy.
The study provides a quantitative framework for assessing DBS-related MEG distortions.
This framework can be adapted to evaluate interference from other implanted or external devices.