CMEG case studies
CMEG · Put your knowledge to work in context.
This independent study page provides practice for CMEG. Its editorial learning areas include MEG sensors, magnetic environment and quality assurance; Preparation, patient protection and equipment safety; Neurophysiological signals, sampling and instrumentation; MEG acquisition, tasks and concurrent EEG; MEG source models, coregistration and interpretation; Documentation, integrity and professional communication. The questions develop subject knowledge and application through worked reasoning, distinctions between competing answers, and practical scenarios. Study the relevant guide before attempting a mixed set, then explain the evidence or calculation that supports each answer. Topics on this exam: MEG sensors, magnetic environment and quality assurance, Preparation, patient protection and equipment safety, Neurophysiological signals, sampling and instrumentation, MEG acquisition, tasks and concurrent EEG, MEG source models, coregistration and interpretation, and Documentation, integrity and professional communication. The CMEG case studies are 4 cases and about 707 words.
1An implanted device and an unwanted artifact
A patient arrives for a neurodiagnostic study with an implanted stimulator. The recording shows a periodic disturbance that appears related to the device cycle.
181 words, under 1 min2Task performance and an uncertain language map
A person undergoing presurgical MEG language mapping struggles to understand the task and misses many responses. The stimulus delivery log also shows occasional missing event markers.
174 words, under 1 min3A precise fit in the wrong coordinates
An analyst fits a compact dipole to a clean MEG transient and obtains excellent agreement with the sensor fields. On the structural display, however, the location is implausible and one landmark is labeled on the wrong side.
180 words, under 1 min4A cleaned display without a processing record
A technologist prepares an attractive summary figure after excluding channels, removing components and changing filter settings. The only raw file is about to be overwritten by the cleaned output because storage is limited.
172 words, under 1 min