Which of the following options forms an INCORRECT statement? Wearable MEG…

Question

BlackTom AI · Accepted Answer

Wearable MEG systems typically employ optically pumped magnetometers (OPMs), not superconducting SQUID sensors used in conventional MEG. Key concepts: conventional MEG uses superconducting quantum interference devices (SQUIDs) that require cryogenic cooling (liquid helium) and fixed helmet arrays. Wearable MEG uses room-temperature sensors (OPMs) that can be mounted on the scalp, permitting flexible layouts and closer proximity to sources.

Step-by-step reasoning:
1. SQUIDs and cryogenics: SQUID sensors operate at superconducting temperatures and therefore require liquid helium cooling and a rigid dewar. Therefore the statement "does not need liquid Helium" describes wearable (OPM) MEG correctly.
2. Sensor-to-brain distance and field strength: Magnetic fields from neural current dipoles fall off rapidly with distance (magnetic dipole field scales roughly as 1/r^3 in the near/far-field transition). Example: if a sensor moves from 5 cm to 2 cm from a source, signal amplitude scales by (5/2)^3 ≈ 15.6× — a large gain. Wearable MEG places sensors much closer to the scalp, improving signal-to-noise ratio and thereby increasing potential sensitivity to deeper sources like the hippocampus. Hence the option claiming potential to sense deep brain areas is plausible and correct.
3. Flexible layouts: Because OPMs are small and can be arranged to fit different head shapes and sizes, wearable MEG allows flexible sensor geometries, unlike fixed SQUID helmets.

Why the chosen answer is incorrect:
- "uses superconducting sensors like conventional MEG." is false for wearable MEG because wearable systems generally use non-superconducting OPMs operating at room temperature; they do not rely on superconductivity or liquid helium cooling.

Why other options are not incorrect:
- "does not need liquid Helium." — true for OPM-based wearable MEG.
- "has the potential to sense deep brain areas such as the hippocampus." — true in the sense that reduced sensor-to-brain distance improves sensitivity and can enhance detectability of deeper sources.
- "allows flexible sensor layouts..." — true since sensors can be placed to conform to head shape.

Conclusion: The incorrect statement is "uses superconducting sensors like conventional MEG." This matches the provided answer.

Which of the following options forms an INCORRECT statement? Wearable MEG…Single choice

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