Clinical safety of intracranial EEG electrodes in MRI at 1.5 T and 3 T: a single-center experience and literature review

Peedicail, Joseph; Poulin, Therese G.; Scott, James N.; Josephson, Colin B.; Bureau, Luc; Hader, Walter; Starreveld, Yves; Federico, Paolo

doi:10.1007/s00234-021-02661-7

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…It has been shown with scalp and iEEG-fMRI systems that the use of appropriately low-specific absorption rate sequences mitigates concerns around RF-induced heating, electrode movement, and inadvertent neural stimulation. 43,44…”

Section: Combining Simultaneous Seeg and Fmri: Is It Worth The Effort?mentioning

confidence: 99%

“…It has been shown with scalp and iEEG-fMRI systems that the use of appropriately lowspecific absorption rate sequences mitigates concerns around RFinduced heating, electrode movement, and inadvertent neural stimulation. 43,44 There are few published studies on iEEG-fMRI and even fewer studies related to its clinical utility. For example, the interpetation of EEG-fMRI studies can be challenging especially when deciding one clinically relavant activations within diffuse BOLD changes.…”

Section: Combining Simultaneous Seeg and Fmri: Is It Worth The Effort?mentioning

confidence: 99%

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Beyond Stereo-EEG: Is It Worth Combining Stereo-EEG With Other Diagnostic Methods?

Jacobs,

Klotz,

Pizzo

et al. 2024

Journal of Clinical Neurophysiology

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Summary: Stereo-EEG is a widely used method to improve the diagnostic precision of presurgical workup in patients with refractory epilepsy. Its ability to detect epileptic activity and identify epileptic networks largely depends on the chosen implantation strategy. Even in an ideal situation, electrodes record activity generated in <10% of the brain and contacts only record from brain tissue in their immediate proximity. In this article, the authors discuss how recording stereo-EEG simultaneously with other diagnostic methods can improve its diagnostic value in clinical and research settings. It can help overcome the limited spatial coverage of intracranial recording and better understand the sources of epileptic activity. Simultaneous scalp EEG is the most widely available method, often used to understand large epileptic networks, seizure propagation, and EEG activity occurring on the contralateral hemisphere. Simultaneous magnetoencephalography allows for more precise source localization and identification of deep sources outside the stereo-EEG coverage. Finally, simultaneous functional MRI can highlight metabolic changes following epileptic activity and help understand the widespread network changes associated with interictal activity. This overview highlights advantages and methodological challenges for all these methods. Clinical use and research applications are presented for each approach.

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Section: Combining Simultaneous Seeg and Fmri: Is It Worth The Effort?mentioning

confidence: 99%

Section: Combining Simultaneous Seeg and Fmri: Is It Worth The Effort?mentioning

confidence: 99%

Beyond Stereo-EEG: Is It Worth Combining Stereo-EEG With Other Diagnostic Methods?

Jacobs,

Klotz,

Pizzo

et al. 2024

Journal of Clinical Neurophysiology

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“…cardiac pacemaker and electrode). [94][95][96][97][98][99][100] MR unsafe corresponds to materials that are dangerous in MR environments, such as surgical scissors and forceps. [101][102][103][104] Preventing eddy current-induced complications in the patient Consideration must be given to eddy currents, which are generated in nearby conductors, including the largest eddy current generated in an MR scanner, which is a shield panel placed inside the gradient coil, which is part of the MR scanner, and when there is ferrous, eddy current is not the only cause of heat generation but also there is so-called antenna effect and current inflow.…”

Section: Intraoperative Mr Imaging Past and Presentmentioning

confidence: 99%

Intraoperative MR Imaging during Glioma Resection

2022

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One of the major issues in the surgical treatment of gliomas is the concern about maximizing the extent of resection while minimizing neurological impairment. Thus, surgical planning by carefully observing the relationship between the glioma infiltration area and eloquent area of the connecting fibers is crucial. Neurosurgeons usually detect an eloquent area by functional MRI and identify a connecting fiber by diffusion tensor imaging. However, during surgery, the accuracy of neuronavigation can be decreased due to brain shift, but the positional information may be updated by intraoperative MRI and the next steps can be planned accordingly. In addition, various intraoperative modalities may be used to guide surgery, including neurophysiological monitoring that provides real-time information (e.g., awake surgery, motorevoked potentials, and sensory evoked potential); photodynamic diagnosis, which can identify high-grade glioma cells; and other imaging techniques that provide anatomical information during the surgery. In this review, we present the historical and current context of the intraoperative MRI and some related approaches for an audience active in the technical, clinical, and research areas of radiology, as well as mention important aspects regarding safety and types of devices.

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“…For example implantable Electrodes on the basis of carbon nanotubes 12 . MRI safety was also reported for implantable platinum electrode arrays in a clinical review 13 .…”

Section: Introductionmentioning

confidence: 98%

Physical behavior of PEDOT polymer electrode during magnetic resonance imaging and long-term test in the climate chamber

Camp

Bergeler²,

Seifert

2023

Sci Rep

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The PEDOT polymer electrode is a metal-free electrode, consisting of an acrylate (dental composite) and the conductive polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). The electrode is applied as gel onto the skin and cured with blue light for 10–20 s in order to achieve a conductive bond to the skin. The electrodes are used in combination with polymer cables consisting of a textile backbone and PEDOT:PSS. To test this new electrode and cable type under different conditions we designed two stress-tests: highly sensitive temperature recordings within a head phantom during Magnetic Resonance Imaging (MRI) and long-term stability inside a climate chamber with high humidity. To study the physical behavior inside the strong magnetic field (3 Tesla), the PEDOT polymer electrode was attached to an agarose head-phantom inside a magnetic resonance tomograph during an image sequence. MRI-safe temperature sensors were placed nearby in order to measure possible heating effects. In comparison to a metal cable, nearly no rise in temperature could be observed if the electrode was used in combination with a conductive textile cable. Furthermore, the electrode showed stable impedance values inside a climate chamber for 4 consecutive days. These results pave the way for testing the PEDOT polymer electrode as biosignal recording electrode during MRI, especially for cardio MRI and Electroencephalography in combination with functional MRI (EEG–fMRI).

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Clinical safety of intracranial EEG electrodes in MRI at 1.5 T and 3 T: a single-center experience and literature review

Cited by 5 publications

References 36 publications

Beyond Stereo-EEG: Is It Worth Combining Stereo-EEG With Other Diagnostic Methods?

Beyond Stereo-EEG: Is It Worth Combining Stereo-EEG With Other Diagnostic Methods?

Intraoperative MR Imaging during Glioma Resection

Physical behavior of PEDOT polymer electrode during magnetic resonance imaging and long-term test in the climate chamber

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