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MRI Safety Basics

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MUHAMMED SWALIH MP

This document discusses safety considerations for working with MRI machines. It covers several topics: 1. The static magnetic field of an MRI is extremely strong, around 30,000 times stronger than Earth's magnetic field. As a result, there are biological and mechanical risks from the magnetic field. 2. There are different safety zones around an MRI machine, with the innermost zone only allowing screened patients and personnel. Various instructions are provided to patients regarding removing all metal objects before an MRI scan. 3. Both patients and personnel must be screened for any metal implants or other factors that could pose a risk during a scan. Certain metals are considered MRI-safe but patients should always check with a technologist about any objects

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MUHAMMED SWALIH MP FINAL YEAR BSc RADIOLOGY AND IMAGING TECHNOLOGY GANGA INSTITUTE OF HEALTH SCIENCES
WHY?
STATIC MAGNETIC FIELD 1.5 T is 30,000 x the strength of earths IT IS TOO SRONG. 30,000 Than Earths Magnetic field
THE MAGNETIC FIELD IS AT FULL POWER ALWAYS .IT IS ALWAYS ON.
SOO IS IT HAZARDOUS
STATIC MAGNETIC FIELD BIOLOGICAL EFFECTS-MISSILE EFFECT MECHANICAL EFFECTS-EFFECT ON FERROMAGNETIC IMPLANTS GRADIENT FIELD INDUCED CURRENTS (PERIPHERAL NERVOUS SYSTEM) AUDITORY DAMAGE RF FIELD RF POWER DEPOSITION BURNS
ZONE 1 THIS REGION INCLUDES ALL AREAS THAT ARE FREELY ACCESSIBLE TO THE GENERAL PUBLIC.
UNSCREENED MRI PATIENTS ALSO MAY BE ATTENDERS ALSOZONE 2
THIS AREA IS THE REGION IN WHICH SCREENED MRI PATIENTS AND PERSONNEL ZONE 3
ZONE 4 THE MRI ROOM WHERE ONLY SCREENED PATIENTS ARE ALLOWED AND ON A DIRECT SUPERVISION OF MRI PERSONEL
5 GAUSS LINE
MRI Safety Basics
MRI Safety Basics
INSTRUCTIONS TO THE PATIENT 1. YOU ARE URGED TO USE THE EAR PLUGS OR HEADPHONES THAT WE SUPPLY FOR USE DURING YOUR MRI EXAMINATION 2. REMOVE ALL MAKE UP AND JEWELRY (E.G., NECKLACES, PINS, RINGS). 3. REMOVE ALL DENTURES, FALSE TEETH, PARTIAL DENTAL PLATES. 4. REMOVE HEARING AIDS. 5. REMOVE EYEGLASSES. 6. REMOVE YOUR WATCH, CELL PHONE, CREDIT AND BANK CARDSAND ALL OTHER CARDS WITH A MAGNETIC STRIP. 7. USE GOWN, IF PROVIDED, OR REMOVE ALL CLOTHING WITH METAL FASTENERS, ZIPPERS, ETC. 8.SQUEEZE BULB IS GIVEN TO THE PATIENT FOR EMERGENCY PURPOSES
H/O MEDICAL DISEASE. H/O SURGERY , CANCER TREATMENT (RADIATION SEEDS). H/O TRAUMA, WAR INJURY, OCCUPATIONAL HISTORY, TATTOO ALLERGY OR PROBLEM DURING PREVIOUS MRI HISTORY OF PREGNANCY AND BREAST FEEDING, LMP CLAUSTROPHOBIA AND ANXIETY
Cerebral aneurysm clips Metallic foreign body in the eye Shrapnel, bullets (in critical area) Metallic Ocular implants Pacemakers Pacing wires Cochlear implantsNeurostimulators Implants and metal Electrical devices
ONLY METALS THAT ARE MRI COMPATIBLE SUCH AS TITANIUM ALUMINUM BRASS IF YOU ARE NOT SURE IF AN OBJECT IS MRI SAFEDONT TAKE IT INTO THE ROOM. ASK A TECHNOLOGIST!!!!!!!!
Usually MRI compatible Cardiac Sternal wires Heart valves & annuloplasty rings Coronary stents Epicardial wires (cut short and taped) Other vascular stents, coils and filters Other Orthopaedic implants Contraceptive devices Dental implants
MRI PERSONAL SCREENING PRE-EMPLOYMENT SCREENING REPORTING OF THE EVENTS LIKE TRAUMA, SURGERY ETC.
EMPLOYEE SAFETY ALL EMPLOYEES MUST BE SCREENED TO WORK IN A MAGNETIC FIELD ENVIRONMENT JUST LIKE THE PATIENTS. NO EXCEPTIONS.
Device and Object Screening As part of the Zone III site restriction and equipment testing and clearing responsibilities, all sites should have ready access to a strong handheld magnet (1000-Gauss) and/or a handheld ferromagnetic detection device.
Few Signs Regarding safety MRI SAFE MRI Conditional MRI Unsafe
GRADIENT SYSTEM SAFETY AUDITORY DAMAGE WILL PRODUCE TYPICAL KNOCKING SOUND INDUCED CURRENTS (PERIPHERAL NERVOUS SYSTEM) RESULTS FROM ELECTRO MAGNETIC FIELDS RESULTS IN HEATING OF HUMAN BODY
o Always apply hearing protection for patients Auditory damage
o PATIENT MUST BE INFORMED ABOUT THE POSSIBILITY PERIPHERAL NERVE STIMULATION o THOSE WHO CLOSE TO THE PATIENT ALSO EXPERIENCE A MILD PERIPHERAL NERVE STIMULATION Induced currents (peripheral nervous system)
RF power deposition Burns So.., It may cause Prevent skin to skin contact creating current loops Keep sufficient distance between patients skin and RF coil Keep RF Coils straight and parallel to main magnetic field RF SAFETY
In the event of an emergency, you should first remove the subject from the MRI scan room Stand near the doors to the scan room to insure no unauthorized emergency personnel can enter NO CODE OR CODE LIKE PROCEDURES WILL BE RUN IN THE MRI ROOM HANDLING EMERGENCY SITUATIONS
Emergency stopper button EMERGENCY STOP BUTTON DOES NOT QUENCH THE MAGNET THIS TURN OFF MOST ELECTRICAL POWER IN THE SCANNER ROOM AND OPERATOR AREA Stop button
QUENCH Quench is done in an emergency ,to run the magnetic field ZERO in order to remove projectile /patient from the scanner in An emergency If these done Cryogens ( Helium and Nitrogen ) BOIL OFF and DEACTIVATE the magnet
Quench button
FIRE AND SAFETY MRI Compatible Fire Extinguisher
REMEMBER THIS MNEMONIC: MRI = METAL RESULTS (IN) INJURY
THANK YOU

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MRI Safety Basics

  • 1. MUHAMMED SWALIH MP FINAL YEAR BSc RADIOLOGY AND IMAGING TECHNOLOGY GANGA INSTITUTE OF HEALTH SCIENCES
  • 3. STATIC MAGNETIC FIELD 1.5 T is 30,000 x the strength of earths IT IS TOO SRONG. 30,000 Than Earths Magnetic field
  • 4. THE MAGNETIC FIELD IS AT FULL POWER ALWAYS .IT IS ALWAYS ON.
  • 5. SOO IS IT HAZARDOUS
  • 6. STATIC MAGNETIC FIELD BIOLOGICAL EFFECTS-MISSILE EFFECT MECHANICAL EFFECTS-EFFECT ON FERROMAGNETIC IMPLANTS GRADIENT FIELD INDUCED CURRENTS (PERIPHERAL NERVOUS SYSTEM) AUDITORY DAMAGE RF FIELD RF POWER DEPOSITION BURNS
  • 7. ZONE 1 THIS REGION INCLUDES ALL AREAS THAT ARE FREELY ACCESSIBLE TO THE GENERAL PUBLIC.
  • 8. UNSCREENED MRI PATIENTS ALSO MAY BE ATTENDERS ALSOZONE 2
  • 9. THIS AREA IS THE REGION IN WHICH SCREENED MRI PATIENTS AND PERSONNEL ZONE 3
  • 10. ZONE 4 THE MRI ROOM WHERE ONLY SCREENED PATIENTS ARE ALLOWED AND ON A DIRECT SUPERVISION OF MRI PERSONEL
  • 14. INSTRUCTIONS TO THE PATIENT 1. YOU ARE URGED TO USE THE EAR PLUGS OR HEADPHONES THAT WE SUPPLY FOR USE DURING YOUR MRI EXAMINATION 2. REMOVE ALL MAKE UP AND JEWELRY (E.G., NECKLACES, PINS, RINGS). 3. REMOVE ALL DENTURES, FALSE TEETH, PARTIAL DENTAL PLATES. 4. REMOVE HEARING AIDS. 5. REMOVE EYEGLASSES. 6. REMOVE YOUR WATCH, CELL PHONE, CREDIT AND BANK CARDSAND ALL OTHER CARDS WITH A MAGNETIC STRIP. 7. USE GOWN, IF PROVIDED, OR REMOVE ALL CLOTHING WITH METAL FASTENERS, ZIPPERS, ETC. 8.SQUEEZE BULB IS GIVEN TO THE PATIENT FOR EMERGENCY PURPOSES
  • 15. H/O MEDICAL DISEASE. H/O SURGERY , CANCER TREATMENT (RADIATION SEEDS). H/O TRAUMA, WAR INJURY, OCCUPATIONAL HISTORY, TATTOO ALLERGY OR PROBLEM DURING PREVIOUS MRI HISTORY OF PREGNANCY AND BREAST FEEDING, LMP CLAUSTROPHOBIA AND ANXIETY
  • 16. Cerebral aneurysm clips Metallic foreign body in the eye Shrapnel, bullets (in critical area) Metallic Ocular implants Pacemakers Pacing wires Cochlear implantsNeurostimulators Implants and metal Electrical devices
  • 17. ONLY METALS THAT ARE MRI COMPATIBLE SUCH AS TITANIUM ALUMINUM BRASS IF YOU ARE NOT SURE IF AN OBJECT IS MRI SAFEDONT TAKE IT INTO THE ROOM. ASK A TECHNOLOGIST!!!!!!!!
  • 18. Usually MRI compatible Cardiac Sternal wires Heart valves & annuloplasty rings Coronary stents Epicardial wires (cut short and taped) Other vascular stents, coils and filters Other Orthopaedic implants Contraceptive devices Dental implants
  • 19. MRI PERSONAL SCREENING PRE-EMPLOYMENT SCREENING REPORTING OF THE EVENTS LIKE TRAUMA, SURGERY ETC.
  • 20. EMPLOYEE SAFETY ALL EMPLOYEES MUST BE SCREENED TO WORK IN A MAGNETIC FIELD ENVIRONMENT JUST LIKE THE PATIENTS. NO EXCEPTIONS.
  • 21. Device and Object Screening As part of the Zone III site restriction and equipment testing and clearing responsibilities, all sites should have ready access to a strong handheld magnet (1000-Gauss) and/or a handheld ferromagnetic detection device.
  • 22. Few Signs Regarding safety MRI SAFE MRI Conditional MRI Unsafe
  • 23. GRADIENT SYSTEM SAFETY AUDITORY DAMAGE WILL PRODUCE TYPICAL KNOCKING SOUND INDUCED CURRENTS (PERIPHERAL NERVOUS SYSTEM) RESULTS FROM ELECTRO MAGNETIC FIELDS RESULTS IN HEATING OF HUMAN BODY
  • 24. o Always apply hearing protection for patients Auditory damage
  • 25. o PATIENT MUST BE INFORMED ABOUT THE POSSIBILITY PERIPHERAL NERVE STIMULATION o THOSE WHO CLOSE TO THE PATIENT ALSO EXPERIENCE A MILD PERIPHERAL NERVE STIMULATION Induced currents (peripheral nervous system)
  • 26. RF power deposition Burns So.., It may cause Prevent skin to skin contact creating current loops Keep sufficient distance between patients skin and RF coil Keep RF Coils straight and parallel to main magnetic field RF SAFETY
  • 27. In the event of an emergency, you should first remove the subject from the MRI scan room Stand near the doors to the scan room to insure no unauthorized emergency personnel can enter NO CODE OR CODE LIKE PROCEDURES WILL BE RUN IN THE MRI ROOM HANDLING EMERGENCY SITUATIONS
  • 28. Emergency stopper button EMERGENCY STOP BUTTON DOES NOT QUENCH THE MAGNET THIS TURN OFF MOST ELECTRICAL POWER IN THE SCANNER ROOM AND OPERATOR AREA Stop button
  • 29. QUENCH Quench is done in an emergency ,to run the magnetic field ZERO in order to remove projectile /patient from the scanner in An emergency If these done Cryogens ( Helium and Nitrogen ) BOIL OFF and DEACTIVATE the magnet
  • 31. FIRE AND SAFETY MRI Compatible Fire Extinguisher
  • 32. REMEMBER THIS MNEMONIC: MRI = METAL RESULTS (IN) INJURY