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Components of MRI - PowerPoint PPT Presentation


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Components of MRI. The strength of the magnet. The effects of magnetic field on loose objects. Only MRI compatible safe equipments can be brought into the scanner in CTI. The effects of magnetic field on electronic devices. Spine stimulator. Deep Brain Stimulator. Pacemaker.

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Presentation Transcript
slide17

Spine stimulator

Deep Brain Stimulator

Pacemaker

slide34

Effects of rapidly changing magnetic filed

According to Faraday’s law of induction, changing magnetic fields may cause induced electrical current in conductors within the body.

The gradient magnetic force strength increases away from the isocenter.

electrical current

slide40

Avoid Gradients effects

  • Do not allow patients to make circuits: separate hands and feet
slide41

Noahs MRI accident.

On November 22, 2009 we handed Noah off to the MRI staff (for his first MRI since the discovery of his brain tumor) so he could be put to sleep for his scan. After he awoke from the scan, we were questioned about the injury to his arm. The staff quickly realized that he had been somehow burned during his MRI scan.

the unit of sar
The unit of SAR
  • Specific Absorption Rate (SAR).

Watt/Kg is the unit of SAR

slide62

MRI Safety Procedures

Know what you dealing with

slide66

ferromagnetic-detectors

Hand held ferromagnetic Detector

slide73

Avoid Burns of the Patient’s Skin and internal tissues.

MRI Safety Procedures

  • To avoid metal implant heating, the technologist may use time separation between the sequences that may increase the temperature to give time for heat to dissipate.
  • The technologist must monitor the SAR reading especially with the fast imaging sequences such as echo planner.
slide80

MRI Safety Procedures

  • Avoid Peripheral Nerve Stimulation
emergency procedures1
Emergency Procedures

CARDIAC OR RESPIRATORY ARREST IS NOT A REASON TO QUENCH THE MAGNET