MRI cylinder — FRCA Primary MCQ

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ModeratePhysicsMRI cylinderFRCA Primary

A standard oxygen cylinder is kept outside the scanner room. What is the most important safety consideration?

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Correct answer: D — Ferromagnetic projectile risk

Ferromagnetic objects can become MRI projectiles. Pressure transducer damping is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Paramagnetic oxygen analyser is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Infrared gas analyser is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. EMG activity can falsely raise the index is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA physics and measurement, the safest answer is the one that follows the underlying physical principle and the limitations of the device.

Reference: Davis and Kenny Basic Physics and Measurement in Anaesthesia; RCoA Primary FRCA syllabus