MRI CHAPTER 4 ADDITONAL SAFETY INFO

Question 1

How many zones of safety are there?

Answer 1

4
Zone I
Zone II
Zone III
Zone IV

Question 2

What is Zone I?

Answer 2

area outside the MR facility which is freely accessible to the public

Question 3

What is Zone II?

Answer 3

an area between full public access and the more restricted areas of the MRI Facility

Question 4

What is Zone III?

Answer 4

the area where access by unscreened non mri personnel or ferromagnetic objects could result in serious injury or even death
-the mr control room
-access to Zone III & the area within Zone III is to be controlled by, and under the supervision of MR personnel

Question 5

What is Zone IV?

Answer 5

the scan room

Question 6

MR personnel are separated into

Answer 6

Level I and Level II personnel

Question 7

What is Level I personnel?

Answer 7

those who have passed minimal safety education to ensure their own safety as they work within Zone III

Question 8

What is Level II personnel?

Answer 8

those who have more extensively trained and educated in the broader aspects of MR safety issues, including issues related to the potential for thermal loading or burns and direct neuromuscular excitation

Question 9

Screening for patient and non-MR personnel is take place outside

Answer 9

Zone III

Question 10

Only ____personnel may allow non-MR personnel access into Zone IV

Answer 10

Level II

Question 11

While in Zone IV, non-MR personnel are to be:

Answer 11

directly supervised and accompanied by Level II personnel

Question 12

True or False: if there is a medical emergency, the patient is to first be removed from Zone IV to a predetermined MRI safe location.

Answer 12

true. the emergent removal of the patient must be accomplished before emergency personnel can respond

Question 13

The current labeling (recognized and used by the FDA) for implants and devices places items into one of three categories:

Answer 13

MR Safe
MR Unsafe
MR Conditional

Question 14

MR Safe

Answer 14

items which pose no known hazards in all MRI environments. examples include glass, wood, and plastic

Question 15

MRI unsafe

Answer 15

• items known to pose hazards in all MRI environments. examples include ferromagnetic objects such as standard o2 cylinders

Question 16

MR conditional

Answer 16

An item that has been demonstrated to pose no known hazards in a specified MRI environment with specified conditions of use.
any device that is metal, magnetically, or electrically activated cannot be labeled as MR Safe. if under certain conditions, it may brought into MRI environment, it would be labeled as MR conditional

Question 17

The safety of any implant or device is based on specific conditions of use which can include:

Answer 17

field strength
RF power limits
gradient switching limits
and/or spatial field gradient limits

Question 18

when screening a patient for intraocular ferrous foreign body, the accepted standard is to:

Answer 18

obtain radiographs of the orbits

Question 19

Patient Monitoring

Answer 19

patients should be monitored verbally and visually during the scan

Question 20

patients who require physiologic monitoring

Answer 20

patients who cannot communicate
language barriers
sedated pts
those with weak voices
pts w/diminished mental capacity
pts at risk for an adverse event following injection of gad based contrast

Question 21

the most common method used for physiologic monitoring is

Answer 21

fiber pulse oximetry

Question 22

True or False. the FDAs stance of safety of MR imaging during pregnancy has not been proven

Answer 22

true. it doesn’t mean its safe, doesn’t mean its unsafe, it means there is no data

Question 23

True or False the use of gadolinium-based MR contrast in pregnant patients is generally avoided.

Answer 23

true

Question 24

in the event of a failure of the primary ventilation system during a quench,

Answer 24

the helium gas can quickly fill the scan room.
if scan room door opens inward & is shut during a quench there would likely be such a large increase in pressure that one would be unable to open the scan room door

Question 25

if anyone were in the scan room during a quench and failure of the primary vent system they would:

Answer 25

experience ruptured ear drums

Question 26

while breathing helium will not cause immediate death,

Answer 26

helium does replace O2 so continued breathing of helium would result in asphyxiation.