Part A: MRI screening and safety Flashcards
- Family members and ancillary personnel accompanying the patient in the scan room:
a. Need not screened because they are not undergoing MRI
b. Can enter the scan room to check on the patient but cannot stay during scanning
c. Should be screened as if they are going through the procedure themselves
d. Must wear a lead apron during the procedure
c. Should be screened as if they are going through the procedure themselves
- In preparation for the MRI examination, patients should be encouraged to:
a. Wear their own clothing so as the feel ‘at home’ with the study
b. Wear a wrist watch so they are aware of the length of the exam
c. Keep their hearing aid in so as to hear to hear the commands and requests of the technologist
d. Change into a hospital down or scrub suit provided by the imaging center and known to be MR safe (containing no metallic components such as snaps and/ or zippers)
d. Change into a hospital down or scrub suit provided by the imaging center and known to be MR safe (containing no metallic components such as snaps and/ or zippers)
- Mrs Jones has just been sent to the MRI department from the emergency room, following a eve motor vehicle accident. She has suffered a fracture of C3 and her physicians are concerned about a cervical spinal cord compression a that level. Select the best method for proceeding with this case.
a. Rush her quickly into the scanner on her own stretcher so as not to aggravate the fracture.
b. Ask her and her family about the possibility of her having metal fragments in her body
c. On finding out that he has had a total hip replacement, cancel the exam
d. Allow her to wear her favorite gold necklace during the procedure
b. Ask her and her family about the possibility of her having metal fragments in her body
- Persons that should be educated about the effects of the static magnetic field, especially in high field superconducting magnets include:
- The nursing staff and the code team
- The housekeeping staff and members of the fire department
- The anesthesiologists and respiratory therapists
- The technologist and the radiologist
a. 4 only
b. 1 and 4 only
c. 1, 3 and 4 only
d. 1, 2, 3 and 4
d. 1, 2, 3 and 4
- According to the White Paper on MRI safety, persons are identified into “levels” whereby :Level 2” personnel include:
a. Persons with no MRI safety training
b. Persons with limited MRI safety training
c. Persons with extensive training in MRI safety to include the broader aspects of MRI (such as the magnetic field,. gradient and RF fields- to name a few)
d. There are no Level 2 personnel in the White Paper of MRI safety
c. Persons with extensive training in MRI safety to include the broader aspects of MRI (such as the magnetic field,. gradient and RF fields- to name a few)
- According to the White Paper on MRI safety, imaging centers should be separate into ‘Zones’ including all of the following EXCEPT:
a. Zone 0- the parking lot
b. Zone 1- freely accessible to any ‘Level’ if MRI personnel
c. Zone 2- the interface between Zone 1 and Zone 2
d. Zone 3- the ‘warm’ Zone, generally the console area and the last stop before the scan room
e. Zone 4- The ‘hot’ Zone, the scan room itseld
a. Zone 0- the parking lot
- A screening questionnaire for patients about to undergo MRI should include information about:
a. Prior injuries
b. Prior surgery and implants
c. Pregnancy
d. All of the above
d. All of the above
- the terminology for devices and implants in the MRI was modified a few years ago, whereby the term MR compatible has been replaced with all of the following EXCEPT:
a. MR reliable
b. MR safe
c. MR unsafe
d. MR conditional
a. MR reliable
- Absolute contraindications to MRI include:
- Intracranial vascular clips, unless they are KNOWN to be safe
- Cardiac pacemakers, unless they are KOWN to be safe
- Pregnancy
- Intraocular, ferrous foreign bodies
a. 1 only
b. 1 and 2 only
c. 1, 2 and 3 only
d. 1, 2 and 4 only
d. 1, 2 and 4 only
- The accepted standard of care for the detection of intraocular ferrous foreign bodies is:
a. Computed tomography
b. MRI
c. Plain film
d. Visual examination
c. Plain film
- A method that is more accurate in the detection of small intraocular ferrous foreign bodies is:
a. Computed tomography (CT)
b. MRI
c. Plain film
d. Visual examination
a. Computed tomography (CT)
- Before a patient enters the MRI environment they should be screened for:
a. Prior injuries
b. Prior surgical implants
c. Pregnancy
d. All of the above
d. All of the above
- Of the following implants, which would be considered acceptable to scan by MRI?
a. Ferrous aneurysms clips
b. Neurostimulators
c. Cardiac Pacemakers
d. Heart valves
d. 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:
a. Clearance by the FDA (Food and Drug Administration)
b. Prior testing
c. Manufacturer declaration
d. All of the above
d. All of the above
- The following items are usually allowed to enter the scan room in high magnetic field systems:
a. Surgical stainless steel hemostats
b. Surgical steel scissors
c. Copper tools
d. Laryngoscopes
c. Copper tools
- When used for MRI, cables from RF coils and ECG leads should be:
a. Braided and placed straight through the imager
b. Laid along the patient’s right arm, along the bore
c. Formed into loops within the imager
d. Neatly coiled and ready for use
a. Braided and placed straight through the imager
- Surface coil cables can potentially cause damage to the patient when:
a. They are not frayed and rest along the arm of the patient
b. They are slightly touching the patient and are frayed
c. They are looped and not touching the patient
d. All of the above
e. None of the above
d. All of the above
- A quench can be used to:
a. Improve image quality in MRI
b. Rapidly remove superconductivity and the magnetic field
c. Maintain magnetic field homogeneity
d. Satisfy the thirst of the technologist
e. Lubricate the magnet coils
b. Rapidly remove superconductivity and the magnetic field
- During a quench, patients and operators should be evacuated from the room to avoid:
a. Asphyxiation and frostbite
b. Subarachnoid hemorrhage
c. Ruptured tympanic membranes
d. a and c
e. a, b and c
d. a and c
- What is regulated by FDA?
a. Length
b. Diameter
c. Acoustic noise
d. Scan time
c. Acoustic noise
- For optimum operation of MRI systems, the ambient temperature and relative humidity should remain between:
a. 30°F and 50°F/ 30% and 50%
b. 65°F and 75°F/ 65% and 70%
c. 70°F ad 90°F/ 70% and 100%
d. No specific temperature or humidity range
b. 65°F and 75°F/ 65% and 70%
- The acceptable safe level for exposure to magnetic fringe fields with respect to patients with cardiac pacemakers has been reported to be:
a. Between 5g and 15g
b. Between 5T and 15T
c. Between 15g and 30g
d. Below 5g
d. Below 5g
- Magnetic field shielding can be achieved either actively or passively. Passive shielding can be achieved by lining the MRI room with:
a. Copper
b. Steel
c. Lead
d. None of the above
b. Steel
- RF shielding can be achieved by lining the MRI room with:
a. Copper
b. Steel
c. Lead
d. None of the above
a. Copper
- It is acceptable for the general population to be exposed to a field strength of:
a. 2.0 Tesla
b. 4.0 Tesla
c. 8.0 Tesla
d. 5.0 gauss
d. 5.0 gauss