Monitoring the patient's EEG during echo planar MRI

Ives, John R.; Warach, Steve; Schmitt, Franz; Edelman, Robert R.; Schomer, Donald L.

doi:10.1016/0013-4694(93)90156-p

Cited by 360 publications

(228 citation statements)

References 3 publications

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“…The EEG equipment to use within the magnet (OptiLink, Neuroscan, Herndon, VA) is described elsewhere (Ives et al, 1993). EEG was recorded continuously on a 64 channel EEG machine (Deltamed SA, France) with a sampling rate of 128 Hz.…”

Section: Fmri and Eeg Acquisitionmentioning

confidence: 99%

“…Thus, EEG monitoring during image acquisition is mandatory in order to carry out meaningful analysis. A system allowing EEG recording inside the magnet has recently been introduced and preliminary studies showed promising results with regard to technical aspects and focus localization (Ives et al, 1993;Warach et al, 1996). However, as the study of Warach and collaborators showed, multiple areas of signal enhancement can be found, requiring additional detailed temporal analysis in order to identify the leading source.…”

Section: Introductionmentioning

confidence: 99%

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Non-invasive epileptic focus localization using EEG-triggered functional MRI and electromagnetic tomography

Seeck

Lazeyras

Michel

et al. 1998

Electroencephalography and Clinical Neurophysiology

241

113

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We present a new approach for non-invasive localization of focal epileptogenic discharges in patients considered for surgical treatment. EEG-triggered functional MR imaging (fMRI) and 3D EEG source localization were combined to map the primary electrical source with high spatial resolution. The method is illustrated by the case of a patient with medically intractable frontal lobe epilepsy. EEG obtained in the MRI system allowed triggering of the fMRI acquisition by the patient's habitual epileptogenic discharges. fMRI revealed multiple areas of signal enhancement. Three-dimensional EEG source localization identified the same active areas and provided evidence of onset in the left frontal lobe. Subsequent electrocorticography from subdural electrodes confirmed spike and seizure onset over this region. This approach, i.e. the combination of EEG-triggered fMRI and 3D EEG source analysis, represents a promising additional tool for presurgical epilepsy evaluation allowing precise non-invasive identification of the epileptic foci.

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Section: Fmri and Eeg Acquisitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-invasive epileptic focus localization using EEG-triggered functional MRI and electromagnetic tomography

Seeck

Lazeyras

Michel

et al. 1998

Electroencephalography and Clinical Neurophysiology

241

113

View full text Add to dashboard Cite

show abstract

“…The first applications of EEG-fMRI were born of a clinical interest in the improved localization of the neural sources of epileptogenic EEG activity for diagnosis and presurgical planning (Ives et al, 1993). Although the onset of pathological brain activity can clearly be inferred from EEG measurements, locations in the cortex from which these pathogenic neuronal events spread cannot unambiguously be derived from EEG alone.…”

Section: Introductionmentioning

confidence: 99%

Methods for Simultaneous EEG-fMRI: An Introductory Review

Huster

Debener²,

Eichele³

et al. 2012

J. Neurosci.

277

182

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The simultaneous recording and analysis of electroencephalography (EEG) and fMRI data in human systems, cognitive and clinical neurosciences is rapidly evolving and has received substantial attention. The significance of multimodal brain imaging is documented by a steadily increasing number of laboratories now using simultaneous EEG-fMRI aiming to achieve both high temporal and spatial resolution of human brain function. Due to recent developments in technical and algorithmic instrumentation, the rate-limiting step in multimodal studies has shifted from data acquisition to analytic aspects. Here, we introduce and compare different methods for data integration and identify the benefits that come with each approach, guiding the reader toward an understanding and informed selection of the integration approach most suitable for addressing a particular research question.

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“…These limitations could potentially be mitigated if icEEG recording were used in combination with functional MRI (fMRI). Indeed, despite its own limitations scalp EEG has previously been successfully combined with fMRI in study patients with epilepsy, providing unique new information on the haemodynamic correlates of paroxysmal discharges in a good proportion of cases studied to date [4][5][6][7][8]. Importantly, these include brain areas thought to be primarily responsible for the generation of interictal and ictal epileptic discharges visible on scalp EEG recordings [5,7,9,10].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of simultaneous intracranial EEG-fMRI in humans: A safety study

Carmichael¹,

Thornton

Rodionov³

et al. 2010

NeuroImage

111

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In epilepsy patients who have electrodes implanted in their brains as part of their presurgical assessment, simultaneous intracranial EEG and fMRI (icEEG-fMRI) may provide important localising information and improve understanding of the underlying neuropathology. However, patient safety during icEEG-fMRI has not been addressed.Here the potential health hazards associated with icEEG-fMRI were evaluated theoretically and the main risks identified as: mechanical forces on electrodes from transient magnetic effects, tissue heating due to interaction with the pulsed RF fields and tissue stimulation due to interactions with the switched magnetic gradient fields.These potential hazards were examined experimentally in-vitro on a Siemens 3 T Trio, 1.5 T Avanto and a GE 3 T Signa Excite scanner using a Brain Products MR compatible EEG system. No electrode flexion was observed. Temperature measurements demonstrated thatheating well above guideline limits can occur. However heating could be kept within safe limits (<1.0°C) by using a head transmit RF coil, ensuring EEG cable placement to exit the RF coil along its central z-axis, using specific EEG cable lengths and limiting MRI sequence specific absorption rates (SARs). We found that the risk of tissue damage due to RF-induced heating is low provided implant and scanner specific SAR limits are observed with a safety margin used to account for uncertainties (e.g. in scanner-reported SAR). The observed scanner gradientswitching induced current (0.08mA) and charge density (0.2μC/cm 2 ) were well within safety limits (0.5mA and 30μC/cm 2 , respectively).3

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Monitoring the patient's EEG during echo planar MRI

Cited by 360 publications

References 3 publications

Non-invasive epileptic focus localization using EEG-triggered functional MRI and electromagnetic tomography

Non-invasive epileptic focus localization using EEG-triggered functional MRI and electromagnetic tomography

Methods for Simultaneous EEG-fMRI: An Introductory Review

Feasibility of simultaneous intracranial EEG-fMRI in humans: A safety study

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