It is a Basic overview On Mri Safety aspects for Budding Radiologic Technologists

1. MUHAMMED SWALIH MP
FINAL YEAR
BSc RADIOLOGY AND IMAGING TECHNOLOGY
GANGA INSTITUTE OF HEALTH SCIENCES

2. WHY?

3. STATIC MAGNETIC FIELD
1.5 T is 30,000 x the strength of earth’s
IT IS TOO SRONG……….
30,000 Than Earth’s 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

11. 5 GAUSS LINE

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
SAFE…DON’T 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

30. Quench button

31. FIRE AND
SAFETY
MRI Compatible Fire Extinguisher

32. REMEMBER THIS MNEMONIC:
MRI =
METAL RESULTS (IN)
INJURY

33. THANK
YOU