HOGLUND BRAIN IMAGING CENTER MRI Safety MRI TERMINOLOG

HOGLUND BRAIN IMAGING CENTER MRI Safety

MRI TERMINOLOG Y BIO EFFECTS (RISKS TO SUBJECTS) ACCESS ZONES TRAINING GOALS EMERGENCY PROCEDURES SAFETY SCREENING MAGNET QUENCH

MRI TERMINOLOGY • Tesla (T): magnetic field strength • Gauss (G): another measurement of field strength • Quench: to suppress or remove the magnetic field • Ferromagnetism: the attraction between a magnet and ferromagnetic materials such as iron

Earth = 0. 5 Gauss 1. 5 Tesla = 15, 000 Gauss 3 Tesla = 30, 000 Gauss

MRI Access Zones Hallway Zone II Patient Waiting Zone I: Trained personnel may escort and are responsible for subjects Zone II: Trained personnel must screen all subjects entering Zone IV Zone III and IV: Restricted Access Areas Control Room Zone III Scanner Zone IV

Read all signs before entering room 3 T

24 Hours a Day 7 Days a Week 365 Days a Year

Main Magnetic Field • Projectile or Missile Effect • Electronics Interference

Examples of what needs to stay in lockers

These items MUST be MRI Safe to enter the scanner room

Can enter scanner room Needs to be approved by MRI staff NOT MRI SAFE

Subjects with these items will NOT be scanned • Pacemakers/Defibrillators • Neurostimulators • Lyric Hearing Aids • Electronic Cochlear Implants May cause the device to MALFUNCTION and may cause DEATH

Gradient Field Hazards • Acoustic Noise • Peripheral Nerve Stimulation (PNS)

Acoustic Noise Problems • Annoyance • Verbal Communication Difficulties • Heightened Anxiety • Temporary Hearing Loss • In Extreme Cases, Permanent Hearing Impairment

Protect Hearing Ear Plugs are Mandatory in the Scanner

Peripheral Nerve Stimulation (PNS) Rapid switching of the gradients may cause tingling and/or twitching in the hands, feet, or face

Radio Frequency Pulses Can Cause • Tissue Heating • Antennae Effect

Excessive Heating • Power deposition measured by SAR (Specific Absorption Rate) • Dependent on several factors, including subject’s height, weight, and thermoregulation • Safety is regulated by FDA

Burns (Antenna Effects) • Equipment such as ECG leads and patient monitoring cables • Metal on or in clothing • Crossing arms/hands and legs/feet

Invisible metallic microfiber in clothing presents unrecognized MRI risk for cutaneous burn. A case of a thermal burn has occurred during MR imaging likely caused by silver-embedded microfibers in the fabric of an undershirt. As the prevalence of fabric containing nondetectable metallic microfiber increases in athletic and "tech" clothing, the importance of having patients change into safe facility-provided garments before MR imaging is emphasized.

First Degree Burn Considerations Transdermal Patch Metallic Nail Polish Body Piercings Bullets/BB’s Hearing Aids IU D Metal Shrapnel Hair Gel & Deodorant Tattoos

• Screen for all metal implants and devices • Screen for surgeries • Judge on a case by case basis Be Conservative. If there is any question, call for clarification. 5 -7894

Remove Personal Items • Research participant’s personal items must be secured in lockers. • Researchers must remove personal items before entering scanner room. s lips C y Jewelry one M t Fit Bi Cred Watch it Car ds lip C / s in P Hair Cell Phones Ke ys ns es Badg Pe Lanyard Coins

Remove Non-Projectile Items Credit Cards Flash Drives CD’s

Not Allowed In Zone IV Crash Cart Metal or Electrical Equipment AED Oxygen Tanks Emergency Response Team

“Playground” Rules • Respect Other Researchers a. Scheduling b. During In-Progress Scans • Respect Privacy of our Subjects • Send Required Paperwork

What Can Happen When Rules Are Not Followed?

Good Luck with your Research