MRI screening and safety Flashcards
(63 cards)
family members and ancillary personnel accompanying the patient into the scan room
should be screened as if they are going through the procedure themselves
in preparatoin for the MRI examination patients should be encourage to
change into a hostpital gown or scrub suit provided by the imaging center and known to be MR safe
MRs jones has just been sent to the MRI department from the mergency room followoing a severe motor vehichle accident. She ahs suffered a fracture of C3 and her physicians are concerned about a cervical spinal cord compression at that level
select the best method for proceeding with this case
ask her and her family about the possibility of her having metal fragments in her body
persons should be educated about the effects of the static magnetic field especially in high field superconducting magnets include
nursing staff and code team
housekeeping
members of fire department
anesthesiologist and respiratory therapists
technologist and radiologist
accodring to the White Paper on MRI safety persons are identified into levels where by level 2 personnel include
persons with extensive training in MRI safety to include the broader aspects of MRI
according to the White Paper on MRI safety imaging centers should be separated into zones including all of the following
zone 1 freely accessible to any level MR personnel
Zone 2 interface between 1 and 3
zone 3 warm zone, generally console area and last stop before scan room
zone 4 the hot zone, scan room itself
a screening questionaire for patients about to undergo MRI should include information about
prior injuries
prior surgery and implants
pregnancy
the terminology for devices and implants in MRI was modified a few years ago, whereby the term MR compatible has been replace with all of the following
MR safe
MR unsafe
MR conditional
absolute contraindications to MRI include
intracranial vascular clips, unless they are KNOWN to be safe
cardia pacemakers, unless they are KNOWN to be safe
intraocular ferrous foreign bodies
the accepted standard of care for the detection of intraocular ferrous foreign bodies is
plain film
a method that is more accurate in the detection of small inraocular ferrous foreign bodies is
CT
before a patient enters the MRI environment they should be screened for
prior injuries
prior surgical implants
pregnancy
of the following implants which would be considered acceptable to scan my MRI
heart valves
if monitoring is to be achieved by electrical and or mechanical devices it is important that compatibility with the MR system be demonstrated by
manufacturer declaration
the following items are usually allowed to enter the scan room in high magnetic field systems
copper tools
when used for MRI cables from RF coils and ECG leads should be
braided and placed straight though the imager
surface soil cables can potentially cause damage to the patient when
they are slightly touching the patient and frayed
a quench can be used to
rapidly remove superconductivity and the magnetic field
during a quench patients and operators should be evacuatied from the room to avoid
asphyxiation and frostbite
ruptured tympanic membranes
what is regulated by the FDA
accoustic noise
for optimum operation of MRI systems the ambient temperature and relative humidity should remain between
65-75 F and 70%
the acceptable safe level for exposure to magnetic fringe fields with respect to patients with cardiac pacemakers has been reported to be
below 5g
magnetic field shielding can be achieved wither actively or passively passive shielding can be achieved by lining the MRI room with
steel
RF shielding can be achieved by lining the MRI room with
copper
