General MR Safety Information

Question 1

Which zones are restricted to authorized personnel?

Answer 1

Zones 3 and 4

Question 2

If a patient has absolute contraindications can they be scanned/permitted to enter Zone 3?

Answer 2

No

Question 3

If a patient has relative contraindications can they be scanned/permitted to enter Zone 3?

Answer 3

Only after getting cleared by by the Clinical Director or chief technologist

Question 4

All unusual MR related incidents should be reported to which 2 people?

Answer 4

Chief Technologist and Clinical Director of the MIC

Question 5

What is true about the magnet room door?

Answer 5

Should be kept closed at all times. except when entering and exiting

Question 6

What happens to the scan room door when the scanner is not in use?

Answer 6

closed and locked

Question 7

What happens to the magnet room door at the end of the scanning day or when not staffed?

Answer 7

closed and locked

Question 8

Who will be the only staff member to escort patients/participants in the scanner room?

Answer 8

MR tech or approved scan operator (only after proper screening)

Question 9

Who is responsible for maintaining the cleaning schedule and assuring proper safety procedures are followed?

Answer 9

Chief Technologist

Question 10

What is the point of shielding the magnet?

Answer 10

protects the magnet from external field disturbances and reduces the field strength outside of the magnet itself

Question 11

Is 4T shielded?

Answer 11

no

Question 12

Are 3T Trio and 3T Prisma shielded?

Answer 12

yes

Question 13

What is the FDA limit for static magnetic field strength for clinical imaging?

Answer 13

8.0T

Question 14

Are there known biological effects associated with MRI?

Answer 14

No

Question 15

What 3 fields are required to create MR images?

Answer 15

a static magnetic field
a radio frequency field
a gradient field

Question 16

What is the predominant biological effect of RF absorption?

Answer 16

tissue heating

Question 17

Why can radio frequency (RF) fields be responsible for significant burn hazards?

Answer 17

Because of the electrical currents that are produced in conductive loops

Question 18

Wires used in MR imaging should be insulated in what 2 ways?

Answer 18

electrically and thermally

Question 19

How is the FDA limit for RF exposure measured?

Answer 19

Either as an increase in body temp or increase in specific absorption rate (SAR)

Question 20

What must be correctly recorded to ensure SAR doesn’t exceed permitted levels?

Answer 20

Patient’s direct weight