An MRI machine has a high field that has to maintained, and this is done by empl

Question

An MRI machine has a high field that has to maintained, and this is done by employing superconducting wire in which a current is constantly flowing but there is no resistance. Which of he following would be hazards in the vicinity of these magnets.

A. Voltages induced in metals and circuits when the field is ramped up or down.

B. Projectiles from a ferromagnetic objects accidentally brought nearby.

C. Interference in small electronic devices when they are moved in the residual field outside the magnet.

D. Heating of surgical implants or even jewelry  that may be moved in the magnetic field while scanning.

E. The voltages generated in movement of materials that do not conduct like bone or cloth.

A. Voltages induced in metals and circuits when the field is ramped up or down.

B. Projectiles from a ferromagnetic objects accidentally brought nearby.

C. Interference in small electronic devices when they are moved in the residual field outside the magnet.

D. Heating of surgical implants or even jewelry  that may be moved in the magnetic field while scanning.

E. The voltages generated in movement of materials that do not conduct like bone or cloth.

Explanation / Answer

All of the following are hazards in vicnity of these magnets:

Ferromagnetic materials, most stainless steel materials and metallic materials are not compatible with the MRI environment. When these materials are exposed to a strong magnetic field, they can be pulled violently toward the magnetic source.

The static magnetic MRI field will tend to induce currents in any conductive materials, including those that may be non-ferrous. The most common sources of thermal
exposure i.e heating effect tend to be looped/un-loopedmedical equipment leads, MRI accessories,and sensors. These include conductive loops touching the patient or crossing the extremities, clothing, and metalized drug delivery patches.

Secondary induced currents andsubsequent secondary generated magnetic fields may cause brief and benign – but noticeable – reactions in the patient.

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