Helium 4 Optically Pumped Magnetometers : a New Generation of Sensors for High Speed Functional Brain Imaging

Study Overview
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Brief Summary
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Our goal is to perform a first evaluation of the capabilities of a new generation of non-invasive magnetoencephalography sensors (OPM He4) to record brain magnetic activities. The investigator will record 1) normal subjects stimulated with visual, auditory, somesthesic and motor stimuli and 2) epileptic patient. The investigator will compare the signal to noise ratio of the normal or pathological activities between classical MEG sensors and our OPM He4 prototype.

Official Title
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Helium 4 Optically Pumped Magnetometers : a New Generation of Sensors for High Speed Functional Brain Imaging

Conditions
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Normal Subject, Patient With Pharmaco-resistant Epilepsy

Intervention / Treatment
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* Device: MEG recordings


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Volunteers: Age 18+ Right handed Medical insurance Strongly motivated to participate to the study Signed informed consent for the study No previous neurology or psychiatric pathologies No major cognitive deficit and able to understand the instructions Patients: Age 18+ Right handed Medical insurance Strongly motivated to participate to the study Signed informed consent for the study No previous neurology or psychiatric pathologies (except epilepsy) Epilepsy evolving during at least two years No major cognitive deficit and able to understand the instructions Exclusion Criteria: Volunteers: Age < 18 years or > 60 previous neurology or psychiatric pathologies Child bearing women Subject having one of the following mettalic parts : (pacemaker, implentable pump, neurosimulator, chochlear implant, auditory prothesis, mettalic prothesis, intracerebral clip, implantable defibrilator, any mettalic parts in the brain or upper part of the body, ventriculoperitoneal valve) Claustrophobia Woman with a positive pregnancy test during the inclusion. Patients: Age < 18 years or > 60 previous neurology or psychiatric pathologies except epilepsy Child bearing women Subject having one of the following mettalic parts : (pacemaker, implentable pump, neurosimulator, chochlear implant, auditory prothesis, mettalic prothesis, intracerebral clip, implantable defibrilator, any mettalic parts in the brain or upper part of the body, ventriculoperitoneal valve) Claustrophobia Woman with a positive pregnancy test during the inclusion.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Sensors<br>All subjects will follow the same experimental procedure: a recording using classical MEG followed by a recording in the same condition with the OPM He4 prototype. | Device: MEG recordings<br>* Classical MEG recordings (patient at rest, normal subjects stimulated with visual, motor, somesthesic and auditory stimuli). MEG recordings with our OPM He4 prototype (patient at rest, normal subjects stimulated with visual, motor, somesthesic and auditory stimuli).<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Signal to Noise Ratio of the recorded brain activities | Volunteers: The signal to noise ratio of normal brain activity following a stimulus will be computed with respect to the pre-stimulus baseline -100ms to -10 ms. Epileptic patient: The signal to noise ratio of abnormal epileptic brain activity will be computed with respect to a 100 ms baseline not containing any abnormal activity. | 1 month | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Signal to Noise Ratio of pre-frontal auditory activity | evaluate the capacities of MPO to record pre-frontal auditory activities which are not recorded by classical MEG. EEG will be the reference | one month | 
| Signal to Noise Ratio of high frequency epileptic activity | evaluate the capacities of our MPO to record high frequency epileptic signal which are not recorded by current generation of MPO | one month. | 
| Comfort of the subject during the MPO He4 recordings for epileptic patient through a short verbal questionary | The evaluation will be done verbally through a short questionary. This questionary evaluates the overall comfort of the MPO system with two questions: 1) An evaluation of the overall comfort thanks to a scale with five steps from very uncomfortable to very comfortable and 2) A comparison with the classical MEG system thanks to a 5 steps scale from much less comfortable than the classical MEG system to much more comfortable. | 5 minutes after the end the recording session | 
| Comfort of the subject during the MPO He4 recordings for volunteers through a short verbal questionary | The evaluation will be done verbally through a short questionary. This questionary evaluates the overall comfort of the MPO system with two questions: 1) An evaluation of the overall comfort thanks to a scale with five steps from very uncomfortable to very comfortable and 2) A comparison with the classical MEG system thanks to a 5 steps scale from much less comfortable than the classical MEG system to much more comfortable. | 5 minutes after the end of each recording session | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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MEG, OPM, epilepsy, normal brain activity