CMEG flashcards
CMEG · Build recall with a focused review session.
24 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Magnetometer
- A magnetic sensor measuring field under its actual geometry and operating requirements rather than directly identifying individual neurons.
- Gradiometer
- A sensor arrangement responding to spatial field differences that can reduce some distant interference but not every artifact.
- Empty-room recording
- A measurement characterizing aspects of system and environmental noise without capturing every patient-related source of contamination.
- Phantom assessment
- A test under known conditions used to evaluate specified system performance without guaranteeing every clinical localization.
- Device screening
- Review of relevant implants, accessories and system-specific risks before the proposed recording or stimulation activity.
- Impedance balance
- The relationship between input contact impedances that can affect noise rejection and should be considered with actual equipment.
- Clinical event annotation
- Accurate recording of observed patient behavior and timing when safe, without independently assigning an unsupported diagnosis.
- Cryogenic hazard
- A cold, pressure or atmospheric risk associated with the actual cryogenic system, requiring trained procedures and response.
- Differential amplification
- Measurement of a difference between inputs with designed rejection of common signals, subject to actual equipment and contact conditions.
- Aliasing
- Misrepresentation of higher-frequency content at lower apparent frequencies when sampling and filtering conditions are unsuitable.
- Latency jitter
- Variation in response timing across trials that can blur a time-locked average even when individual responses exist.
- Coherent artifact
- Interference that repeats systematically with the event or stimulus and may therefore persist during averaging.
- Head localization
- Determination of the head’s relationship to the sensor coordinates using the appropriate system-specific procedure and quality checks.
- Event marker
- Stored timing information linked to an event that must be related correctly to actual stimulus delivery or behavior.
- Concurrent EEG-MEG
- Recording of complementary electrical and magnetic measurements whose different sensitivities can affect the visibility of an event.
- Task validity
- Evidence that the person understood and performed the intended activity sufficiently for the proposed mapping interpretation.
- Forward solution
- A model prediction of sensor measurements from assumed source currents, geometry and relevant head-model conditions.
- Inverse estimate
- An inferred source explanation for measured fields that depends on constraints and is not uniquely determined by the measurements alone.
- Coregistration
- Alignment of functional measurement coordinates with structural anatomy, requiring correct identity, labels, landmarks and quality review.
- Goodness of fit
- A measure of model-data agreement that does not independently establish anatomical accuracy, epileptogenicity or a clinical outcome.
- Contemporaneous record
- A record made with reliable timing near the event rather than reconstructed later from uncertain memory.
- Closed-loop alert
- A communication in which the finding is stated and receipt or understanding is confirmed through the agreed pathway.
- Processing provenance
- A traceable history of settings, exclusions, software and transformations needed to review or reproduce an analysis.
- Raw data preservation
- Retention of the original measurement and relevant metadata so later processing does not replace the only source evidence.