CMEG cheat sheet
CMEG · Keep the key ideas within reach.
MEG sensors, magnetic environment and quality assurance
Distinguish SQUID and optically pumped sensor requirements.
Magnetometers and gradiometers have different spatial responses.
Empty-room and phantom tests answer bounded quality questions.
Verify stimulus artifact and actual delivery timing.
Preparation, patient protection and equipment safety
Verify identity, indication, communication needs and relevant restrictions.
Use actual equipment and infection-control instructions.
Device or medicine changes require appropriate clinical authority.
Patient protection takes priority over obtaining a clean trace.
Neurophysiological signals, sampling and instrumentation
Distinguish electrical potential, magnetic field and evoked response.
Check the whole measurement chain and actual contact quality.
Sampling and filters change what is available for interpretation.
Averaging gains depend on assumptions and do not remove every artifact.
MEG acquisition, tasks and concurrent EEG
Match the recording plan to the clinical question and person.
Track head geometry and preserve coordinate accuracy.
EEG and MEG provide complementary, imperfect visibility.
Document task performance, event timing and acquisition limitations.
MEG source models, coregistration and interpretation
Forward and inverse models answer different questions.
Check anatomical correspondence beyond a summary fit metric.
Fit quality does not establish epileptogenicity or guaranteed accuracy.
Preserve processing provenance and integrate the wider clinical evidence.
Documentation, integrity and professional communication
Keep identity, laterality and relevant metadata traceable.
Record actual observations and distinguish correlation from causation.
Escalate significant changes promptly with closed-loop communication.
Preserve raw data, processing history and appropriate confidentiality.