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Chapter 15: MRI Safety

Chapter 15: MRI Safety. Mark D. Herbst, MD, PhD. Two main sources of danger. Magnetic field RF Energy Also Gradients Acoustic noise. 5 Gauss Line. Generally regarded as safe. Magnetic field exposure. No demonstrated biological effects in normal patients Internal objects-ferromagnetic

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Chapter 15: MRI Safety

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  1. Chapter 15: MRI Safety Mark D. Herbst, MD, PhD

  2. Two main sources of danger • Magnetic field • RF Energy • Also • Gradients • Acoustic noise

  3. 5 Gauss Line • Generally regarded as safe

  4. Magnetic field exposure • No demonstrated biological effects in normal patients • Internal objects-ferromagnetic • Metal in eyes—blindness? • Old steel aneurysm clips---movement/occlusion? • Implants or prostheses—depends on metal used—usually safe • Pacemakers—some say okay, but better safe than sorry • Use Shellock’s book or website www.mrisafety.com

  5. Magnetic field • External objects—ferromagnetic only • Small projectiles • Large objects can pin a patient or cause harm

  6. Gradients • More heating with higher slew rates • 6T/sec = safe • Acoustic noise—use earplugs or headphones

  7. RF energy • Depositing energy like in a microwave oven! • SAR = specific absorption rate (watts/kilo) • Depends on patient weight—do not lie! • Depends on imaging technique • Surface burns –EKG leads

  8. Responsibility of the TECH • Make sure the pt has completed a screening form • Keep unscreened people out of danger • Listen to the patient when they are in the machine • Refuse to scan patient if it may cause harm or if you are unsure.

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