Flashcards in MRI Safety 2 Deck (46)
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1
Special foley catheters with temperature sensors are
a. MRI safe @ 1.5T
b. potential sources for small artifacts
c. contraindicated for MRI
d. a and b
c. contraindicated for MRI
2
If a patient says that they have a non ferromagnetic intracranial aneurysm clip, then the proper action is to
a. perform an MRI brain scan
b. perform an MRI non brain scan
c. consult the patient's personal physician
d. consult the attending radiologist
d. consult the attending radiologist
3
The deflection angles found when testing for magnetic field interactions are typically greatest in
a. 1.5 T shore bore MR systems
b. 1.5 T long bore MR systems
c. 3.0 T short bore MR systems
d. 3.0 T long bore MR systems
c. 3.0 T short bore MR systems
4
Extremity MRI systems are typically used for assessing what kind of pathology
a. cardiac
b. abdominal
c. musculoskeleltal
d. all of the above
c. musculoskeletal
5
A properly tested metallic suture is considered MR safe
a. true
b. false
a. true
6
CSF shunt are used to treat
a. hemorrhage
b. hydrocephalus
c. neuralgia
d. all of the above
b. hydrocephalus
7
Which MRI hazard would be most substantial for ECG leads
a. magnetic field interaction
b. artifacts
c. a and b
d. none of the above
d. none of the above
8
Pillcam is an ____ and is considered MR ____
a. endoscopy device, safe
b. endoscopy device, unsafe
c. neurostimulator, safe
d. neurostimulator, unsafe
b. endoscopy device, unsafe
9
Which of the following aneurysm clips are contraindicated for MRI procedures
a. titanium
b. titanium alloy
c. martensitic stainless steel
d. austenitic stainless steel
c. martensitic stainless steel
10
The function of which device can be altered by the MR system static magnetic field
I. ICD
II. Pacemaker
III. Medtronic Insulin Pump
a. II only
b. I and II only
c. II and III only
d. I II and III
d. I II and III
11
Besides magnetically activated dental implants, other dental implants are not a contraindication for MRI considering their
a. metallic nature
b. non metallic nature
c. negative magnetic interaction
d. positive retentive force
d. positive retentive force
12
Which implants and devices require special MRI scrutiny
I. electrically activated
II. magnetically activated
III. mechanically activated
a. I only
b. I and II only
c. II only
d. I II and III
d. I II and III
13
A patient with a non ferromagnetic cardiac occluder for PDA ASD and VSD can undergo an MR procedure at any time
a. true
b. false
a. true
14
If a device or implant is found to be MR safe at 1.5 T then it will also be MR safe at 3.0 T
a. true
b. false
b. false
15
A stent will usually be incorporated securely into a vessel wall due to tissue ingrowth after what time period
a. 6 days
b. 6 weeks
c. 6 months
d. 6 years
b. 6 weeks
16
Some breast tissue expanders or implants may produce artifacts because of
a. saline solution
b. silicone
c. stainless steel injection ports
d. all of the above
c. stainless steel injection ports
17
Theraseed radioactive implants deliver low level radiation to
a. breast
b. ovaries
c. uterus
d. prostate
d. prostate
18
If an MRI patient has a transdermal patch for nitroglycerine, then the proper safety procedure is to
a. remove patch for exam and re-administer patch after exam
b. leave patch as is and perform exam
c. do not perform exam
d. contact physician
d. contact physician
19
A trauma patient with a serious neck injury is brought to the MR suite with a cervical fixation device. Can the device enter the MR scan room?
a. yes definitely do not mess with the fixation device
b. no definitely, fixation devices do not enter the MR scan room
c. maybe, depending on the patient's condition
d. maybe, depending on the type of fixation device
d. maybe, depending on the type of fixation device
20
can patients enter the MR scan room if they have ferromagnetic implants
a. always
b. usually
c. sometimes
d. never
c. sometimes
21
Broken leads would present a problem for
a. spinal fusion stimulator
b. breast tissue expander
c. penile implant
d. none of the above
a. spinal fusion stimulator
22
the reveal plus insertable loop recorder records patient ECG traces. the Reveal Loop Insertable Loop Recorder
a. is unaffected by MR procedures
b. is MR unsafe
c. must be interrogated before performing MR procedures
d. must be removed before performing MR procedures
c. must be interrogated before performing MR procedures
23
the main problem with contraceptive diaphrgms and MR procedures is
a. heating
b. movement
c. artifacts
d. all of the above
c. artifacts
24
A family member with a defibrillator wishes to accompany a spouse in the MR scan room. the proper action of the technologist concering entrance to the MR scan room for this family member is to
a. allow entrance
b. screen for other contraindications, then possibly allow entrance
c. disallow entrance
d. consult the attending radiologist
c. disallow entrance
25
Non ferromagnetic oxygen tanks utilized in the MR environment are typically made of
a. titanium
b. aluminium
c. stainless steel
d. none metallic alloy
b. aluminium
26
A parkinson's patient arrives with a neurostimulator. if the usual protocols are observed, can the patient receive an MR exam
a. yes
b. maybe
c. no
d. all of the above
c. no
27
What kind of testing is first performed to determine the safety of metallic implants, devices or materials
a. simulations
b. in vivo
c. ex vivo
d. all of the above
b. ex vivo
28
For clinical MRI, standard cardiac pacemakers are typically contraindicated
a. true
b. false
a. true
29
There has never been a patient fatality from an aneurysm clip in the MR environment
a. true
b. false
b. false
30
A patient with an electrically conductive cardiovascular catheter is contraindicated for MRI
a. true
b. false
a. true
31
A patient with a hearing aid arrives for an MRI exam. can the patient receive the exam
a. yes, but keep hearing aid in ear for instructions
b. yes, but hearing aid must be removed for scan
c. ye , but hearing aid must be removed for scan and ear plug must be worn
d. No, even if hearing aid is removed, there could be further hearing damage
c. yes but hearing aid must be removed for scan and ear plugs must be worn
32
Enterra therapy is used to treat
a. hydrocephalus
b. sciatica
c. cardiac arrhythmia
d. gastroparesis
d. gastroparesis
33
If the device type is known and tested safe which patients may typically undergo MRI exams
I. Patients with heart valve replacements
II. patients with standard pacemakers
III. patients with vascular clips
a. I only
b. I and III only
c. III only
d. I II and III
b. I and III only
34
There is no alteration in the performance of any CSF shunt valve that have been tested to be MRI safe at 1.5 T
a. true
b. false
b. false
35
Which substances make the best surgical instruments for MR procedures
a. aluminum alloys
b. titanium alloys
c. stainless steel alloys
d. a and b
b. titanium alloys
36
Which of the following are true statements about programmable infusion pumps
I. MRI contraindicated
II. Tube in intrathecal space
III. Motor stop during MRI exposure
a. I and III
b. II and III
c. III
d. I II and III
b. II and III
37
A patient with a cochlear implant may undergo which MRI procedure
a. brain
b. knee
c. a and b
d. none of the above
d. none of he above
38
May a patient with an ICD undergo an MRI procedure on an extremity MR system
a. yes
b. no
c. maybe
d. none of the above
c. maybe
39
Most injuries in MRI due to the magnetic environment result from
a. electric currents
b. movement of ferromagnetic object
c. RF burns
d. acoustic noise
b. movement of ferromagnetic object
40
Which of the following could be contaminated with ferromagnetic materials
I. bullets
II. shrapnel
III. shotgun pellets
a. I only
b. II only
c. II and III
d. I II and III
d. I II and III
41
Which of the following are considered potentially dangerous body locations for magnetic field interactions
I. soft tissue
II. vascular
III. neural
a. I only
b. II only
c. II and III only
d. I II and III
d. I II and III
42
According to the FDA which kind of device is demonstrated NOT to have significant effect on the diagnostic information from an MRI exam
a. MRI Safe
b. MRI compatible
c. both a and b
d. none of the above
b. MR compatible
43
The guideline for MR scanning of external fixation devices are usually determined on a "case by case" basis. external fixation devices are typically
a. magneticaly activated
b. electronically activated
c. orthopedic
d.a and b
c. orthopedic
44
most sutures are considered to be MR safe at 3.0T
a. true
b. false
a. true
45
How many mT is 5 G
a. .1 mT
b. .5mT
c. 5000 T
d. 50,000 T
b. .5 mT
46
