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Imaging Modalities · NEET PG Preparation Radiology

A 45-year-old man undergoes an emergency MRI for suspected spinal cord compression. As he enters the scanner room, he experiences a severe panic atta…

Practice question from Imaging Modalities (NEET PG Preparation Radiology), with the correct answer and a step-by-step solution.

medium · MCQ · Q-1A13C1

A 45-year-old man undergoes an emergency MRI for suspected spinal cord compression. As he enters the scanner room, he experiences a severe panic attack and attempts to flee, inadvertently carrying a heavy iron-framed oxygen cylinder that gets violently pulled into the bore of the magnet. This phenomenon is primarily related to which physical property of the MRI scanner?

  1. A.Spatial gradient of the static magnetic fieldCorrect answer
  2. B.Radiofrequency (RF) power deposition (SAR)
  3. C.Rapidly switching gradient magnetic fields
  4. D.Permanent fringe magnetic field outside the shielding

Solution

The projectile effect (missile effect) in MRI is caused by the spatial gradient of the static magnetic field. Ferromagnetic objects experience a translational force directed toward the strongest part of the magnetic field (the center of the bore), which is proportional to the spatial gradient of the magnetic field.

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