Stony Brook University Scan Center - MRI Safety Quiz
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Safety training is required for all scanner users new to the center. This involves the review of our MRI Safety, Policies and Procedures presentation, safety video, review of the American College of Radiology White Paper on MR Safety and the following quiz. Once you have finished the quiz please remember to print out your certificate, you will need a copy of this certificate to pass our MRI Safety certification. If you have any questions please feel free to contact us at 631-632-4784.
- 1.
The major risk of injury or harm due to a magnet quench is:
- A.
The boiling off of cryogens that creates an asphyxiating steam
- B.
The magnet becomes so warm that it may cause burns to patients in the bore
- C.
There is no danger with a quench. It is how we shut down the machine for repair
- D.
A blinding flash of light
Correct Answer
A. The boiling off of cryogens that creates an aspHyxiating steamExplanation
If a quench occurs, everyone must be removed from the room immediately. The vapors and gases are very cold and can cause frost-bite. They also often condense the moisture in air, creating a highly visible fog that can replace oxygen in the room.Rate this question:
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- 2.
All of the following statements about the magnet of the MRI scanner are true EXCEPT:
- A.
The magnetic field is extremely powerful
- B.
Large metal objects like floor buffers and oxygen cylinders may be picked up by the field and fly toward the magnet bore at high speeds
- C.
The fringe field is confined to the magnet bore
- D.
The magnet is always on, 24/hrs, 7/days
Correct Answer
C. The fringe field is confined to the magnet boreExplanation
The magnetic field can extend many feet from the inner bore of the magnet. Rooms are shielded to contain the field as much as possible. Remember the magnet is always on even when a scan is not initiated. The main magnetic field of a 3T system is 60,000 times the earth's magnet field. We must also limit the items that go into the scan room to non-ferrous metals.Rate this question:
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- 3.
Patients with which of the following prosthetic devices may be safely scanned:
- A.
Cardiac pacemaker
- B.
History of having metal flakes in the eye
- C.
Cochlear implant (inner ear prosthetic device)
- D.
Total knee replacement
Correct Answer
D. Total knee replacementExplanation
The following items can NEVER be allowed into the scanning room:
cardiac pacemakers, cochlear (inner ear) implants, ferromagnetic or unidentifiable aneurysm clips of the brain, implanted neuro stimulators, metal or unidentifiable foreign bodies in the eyes, and implanted pumps to deliver medicine that cannot be removed.
If a subject works around metal and cannot say for sure they have never had any metal in their eyes the study should be canceled.Rate this question:
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- 4.
The emergency shutdown button should be used to immediately cut power to the scanner electrical system in each of the following situations EXCEPT:
- A.
Loud popping noises and smoke come from the scanner
- B.
Sprinklers go off in scan room, but there is no fire
- C.
Scan room fire
- D.
The subject in the scanner squeezes the emergency ball
Correct Answer
D. The subject in the scanner squeezes the emergency ballExplanation
Shutting power to the PDU may be required for life threatening situations such as:
Fire in the computer room, fire, sparks, loud noises emanating from the scan room, flooding or sprinkling system goes off, and catastrophic equipment failure. These reasons should be life threatening. It is important to remember that pressing the emergency stop button shuts the power to the scanner to but the magnetic field is still active.Rate this question:
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- 5.
With regard to metal objects in the scan room:
- A.
No metallic objects are allowed in the scan room
- B.
Small objects like hair pins may be attracted by the magnetic field but are too small to constitute a safety risk
- C.
Metallic objects may be tested for ferromagnetism by the technologist with a hand-held magnet; if not ferromagnetic, they may be allowed in the scan room
- D.
Most equipment used in an exam is MRI compatible so there is really no reason to worry about this
Correct Answer
C. Metallic objects may be tested for ferromagnetism by the technologist with a hand-held magnet; if not ferromagnetic, they may be allowed in the scan roomExplanation
Small items like paper clips or hair pins can have a velocity of about 40mph in a 3T environment. Larger objects have even higher velocities and have become fatal. Many types of clinical equipment are ferromagnetic and should never be brought into the scan room. If there is any question a handheld magnet can be used to test if an object is ferromagnetic or not.Rate this question:
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- 6.
In which of the following situations should you push the “Quench” button:
- A.
A steel oxygen tank was brought into the scan room and has flown across the room and stuck to the magnet, pinning someone’s arm in a painful crush
- B.
Scan room fire
- C.
A janitor has entered the room with a large floor buffing machine which is now stuck to the magnet. No one is hurt, but he can’t pull the machine off the magnet
- D.
All of the above
Correct Answer
A. A steel oxygen tank was brought into the scan room and has flown across the room and stuck to the magnet, pinning someone’s arm in a painful crushExplanation
An intentional quench is done in an emergency to run the magnetic field to zero. This is done in extreme emergencies only (ex- a projectile that is pinning a patient against the magnet, injuring them).Rate this question:
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- 7.
Before beginning to scan a subject, you should:
- A.
Clear the patient of all internal and external metals
- B.
Give the subject earplugs and the emergency squeeze ball
- C.
Check lines of remote verbal communication with the subject (from the workstation)
- D.
All of the answers are true
Correct Answer
D. All of the answers are trueExplanation
You must check each subject for contra-indications they might have before allowing them into the scan room. Once the patient is on the table it is very important you get them as comfortable as possible. The MR scanner can produce very high acoustic noise levels that can cause discomfort. Before you start your protocol make sure you open the lines of communication so the patient knows you can hear them in case of an emergency.Rate this question:
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- 8.
Which of the following is a likely consequence of forgetting to remove your wallet from your pocket before entering the scan room:
- A.
There will likely be no adverse consequence
- B.
The magnetic stripes on your credit cards and ATM cards are erased
- C.
The wallet will heat up and may cause burns
- D.
Because the ink on US currency is ferromagnetic, your wallet may become a projectile and fly into the magnet bore
Correct Answer
B. The magnetic stripes on your credit cards and ATM cards are erasedExplanation
The magnetic field can seriously damage or impair the following personal items:
Cameras, watches, credit and bank cards, hearing aids, hair accessories, belt buckles, shoes and I-pods just to name a few. Please remember to empty ALL of your pockets before entering the scanning room.Rate this question:
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- 9.
If your patient complains of a body ache, dizziness or anxiety (including claustrophobia) during the middle of the scan, you should:
- A.
Quench the magnet
- B.
Press the Emergency Shut Down Button
- C.
Talk to your patient and remove them from the magnet if they cannot go on
- D.
Ignore their complaints
Correct Answer
C. Talk to your patient and remove them from the magnet if they cannot go onExplanation
Routine communication between you and your subject is very important so they know you can hear them if an emergency should arise. The emergency stop button and quench button should only be pressed is a life threatening emergency.Rate this question:
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- 10.
Which of the following objects are potential projectiles?
- A.
Watch
- B.
ID badge
- C.
Pencil
- D.
Clipboard
Correct Answer
D. ClipboardExplanation
Some examples of items that can become projectiles are: Scissors, hair clips and bobby pins, tools, paperclips and clapboards.Rate this question:
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- 11.
What is a Quench?
- A.
Total power down of the computer system
- B.
A ramping up of the magnetic field in which all of the cryogens are put into the bore thus making the scanner super conductive
- C.
How the staff shuts the magnet down after hours, to ensure maximum safety
- D.
A rapid boil off of cryogens and ultimate loss of a magnetic field
Correct Answer
D. A rapid boil off of cryogens and ultimate loss of a magnetic fieldExplanation
MR scanners are super cooled with inert gases such as helium. A quench is the rapid boiling off of these cryogens intentionally or unintentionally.Rate this question:
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- 12.
There are two real safety concerns with regard to the magnetic forces and how they interact with ferrous objects. They can be described as which of the following:
- A.
Translation and Magnetization of the object
- B.
Transverse and Rotation of the object
- C.
Translation and Torque of the object
- D.
Translation and Mutation of the object
Correct Answer
C. Translation and Torque of the objectExplanation
Translation describes the force that attracts ferrous objects to the center of the magnetic field. It is sometimes referred to as the projectile effect. Rotation is the term that relates to the force of the North and South poles and the orientation of the scanner’s magnetic field. Ferrous objects will attempt to align their long axes with this orientation and will rotate until they are aligned with the magnetic field.Rate this question:
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- 13.
In the event your subject is in some type of medical distress, what is the first thing you should do?
- A.
Call 911 and wait for personnel to arrive
- B.
Bring the crash cart into the scan room
- C.
Nothing
- D.
Call 911, remove the patient from the scanning room immediately
Correct Answer
D. Call 911, remove the patient from the scanning room immediatelyExplanation
Should a condition exist where the patient is having a medical emergency, every effort should be made to remove the patient from the scan room. Once the patient is removed from the MR scan room, close the door to prevent re-entry. If you cannot remove the patient remember the magnet is always on. Under no circumstances should anyone be allowed to enter the scan room without proper screening!Rate this question:
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- 14.
To reduce the effects of peripheral nerve stimulation:
- A.
Have the subject uncross their extremities
- B.
Use immobilization pads
- C.
Change the subject out of their street clothes and into a gown
- D.
None of the above
Correct Answer
A. Have the subject uncross their extremitiesExplanation
When a patient crosses their legs or intertwines their fingers a circuit is formed and it is more likely to cause peripheral nerve stimulation.Rate this question:
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- 15.
The main hazard of the Static Field is:
- A.
Nerve Stimulation
- B.
Objects becoming projectiles
- C.
Heat Deposition
- D.
None of the above
Correct Answer
B. Objects becoming projectilesExplanation
Heat deposition and nerve stimulation are hazards of a varying magnetic field.Rate this question:
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- 16.
If there is ever a Quench in the scan room instead of the outside environment, you must remove the patient and all staff from the room immediately. What is the safety concerns?
- A.
Asphyxiation and frost bite
- B.
Explosion
- C.
Convulsion
- D.
Fire
Correct Answer
A. AspHyxiation and frost biteExplanation
If a quench occurs, everyone must be removed from the room immediately. The vapors and gases are very cold and can cause frostbite. They also often condense the moisture in air, creating a highly visible fog that can replace oxygen in the room.Rate this question:
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- 17.
What does SAR measure?
- A.
The length of the scan time
- B.
The amount of heat the patient will absorb during the scan
- C.
The strength of the fringe field outside the bore of the magnet
- D.
All of these answers are correct
Correct Answer
B. The amount of heat the patient will absorb during the scanExplanation
Dissipation of the absorbed RF energy is described in terms of Specific Absorption Rate (SAR), measured in watts/kg. SAR is calculated by the patient’s weight and the expected increase in body temperature for each imaging pulse sequence. The scanner will calculate how much heat the patient will be absorbed if it is too high the scan will not run.Rate this question:
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- 18.
What is the unit for measurement of magnetic field strength?
- A.
Gauss
- B.
Tesla
- C.
Both Gauss and Tesla
- D.
None of the above
Correct Answer
C. Both Gauss and TeslaExplanation
Magnetic fields are measured in units of Gauss or Tesla (1T = 10,000G).Rate this question:
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- 19.
If an object is considered safe to be used in a 1.5Tesla MR scanner, but has not been tested in a 3Tesla scanner, it should be labeled as:
- A.
MR Safe
- B.
Not sure, more research should be done
- C.
MR Not Safe
- D.
Does it matter?
Correct Answer
B. Not sure, more research should be doneExplanation
A 3T magnet is double the strength of a 1.5T unit. It is important to remember that objects that are clear for a 1.5T magnet cannot go into a 3T magnet. Mrisafety.com has the largest database of items that are cleared for the 3T environment.Rate this question:
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- 20.
If a volunteer states she could be pregnant you should:
- A.
Let her know there is no known effects to the fetus and continue the exam
- B.
Ignore the information it doesn't matter if she is pregnant or not
- C.
Tell her to come back when her first trimester is over
- D.
Cancel the exam until she can be sure she is not pregnant
Correct Answer
D. Cancel the exam until she can be sure she is not pregnantExplanation
Unless your research patient can say for certain they are not pregnant they cannot go into the scanner until they know for sure that they are not pregnant. If a research subject is pregnant the exam must be canceled regardless of trimester.Rate this question:
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- 21.
If the operating computer shut down and unplugged, the magnetic field is off and any materials, regardless for their ferromagnetic qualities can be brought into the scanning room.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The magnet is always on 24hrs/7days unless a quench has been initiated.Rate this question:
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- 22.
What is the strength of the scanned at the SCAN Center?
- A.
1T
- B.
7T
- C.
3T
- D.
1.5T
Correct Answer
C. 3TExplanation
We have a Siemens 3T Trio Scanner. 3T machines are double the strength of 1.5T machines. It is important to remember that if an object/implant has been cleared for a 1.5T machine it does not mean it is ok for a 3T machine. Further research must be done.Rate this question:
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- 23.
If you are not sure the ferromagnetic qualities of an object you should:
- A.
Enter the scanning room slowly until you feel the object start to pull from your grasp
- B.
Check it with a hand held magnet
- C.
Bring the object into the room, if it is attracted to the magnet, turn off the scanner and pull it off the machine
- D.
Nothing from the outside can go into the scanning room
Correct Answer
B. Check it with a hand held magnetExplanation
The SCAN center has a .7T hand held magnet you can use to check the magnetic susceptibility of an object. If you still have questions please ask the MRI technologist to assist you. The SCAN Center staff has final say on what may or may not be brought into the scanning environment.Rate this question:
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- 24.
Every subject can choose if they would like to wear ear plugs, head set, both or nothing during the scan. It's up to each individual.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The MRI scanner produces very high acoustic noise, which can reach excess of 130 DbA. Everyone who is scanned must wear both ear plugs and headset during the exam.Rate this question:
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- 25.
Who needs to be cleared before they enter the MRI scanning room?
- A.
The Research Subject
- B.
The Researcher/Research Assistant
- C.
Public Safety Officials (Police/Firemen/EMT)
- D.
The MRI Technologist
- E.
All of the above
- F.
None of the above
Correct Answer
E. All of the aboveExplanation
Because the scanner's magnetic field is always on anyone who steps into the scanning room must be cleared by the SCAN Center's staff. Clearance forms can be found on our web site http://www.psychology.sunysb.edu/scancenter/. Anyone who has not been cleared should stay out of the controlled access areas marked by warning signs.Rate this question:
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- 26.
If a subject says there might be a possibility they could be pregnant but is not 100% sure, they can be scanned.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A female subject needs to be 100% sure they are NOT pregnant to be scanned at the center.Rate this question:
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- 27.
A subject checks the box that they have tattoos, the next step is to:
- A.
Cancel the study, tattoos are never allowed in the scanner
- B.
Wrap the tattoo in a cold compress and continue with the study
- C.
Nothing, tattoos are fine
- D.
Explain that in rare cases tattoos can tingle or burn and let them know if they are not comfortable in continuing they can back out of the study
Correct Answer
D. Explain that in rare cases tattoos can tingle or burn and let them know if they are not comfortable in continuing they can back out of the studyExplanation
Since there have been documented cases of tattoos burning the skin you must let them know there is a small chance of this. At that time they can back out of the study if they want. If they do feel a strange sensation during the scan have them squeeze the emergency ball as soon as possible and apply a cold compress to the area. The study is complete at this time.Rate this question:
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- 28.
Which of the following items must be removed before going into the scanning room?
- A.
Sissors
- B.
Wallet
- C.
Zippers on jeans
- D.
Hair pins
- E.
Nail polish
- F.
Watches
Correct Answer(s)
A. Sissors
B. Wallet
D. Hair pins
F. WatchesExplanation
Before going into the scanning room, certain items must be removed for security reasons. These include scissors, as they can be considered a potential weapon. Wallets should also be removed to ensure that they do not interfere with the scanning process or cause any confusion. Hair pins should be taken out as they can set off metal detectors or cause discomfort during the scan. Watches should be removed to avoid any interference with the scanning equipment.Rate this question:
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- 29.
The magnetic field is contained entirely in the center of the bore, it does not extend to the outside environment
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
All magnets have a fringe field that extends from the center of the magnet. Rooms are shielded as much as possible to contain this field but only people who have been cleared by the SCAN Center should be allowed in the controlled access areas of the center.Rate this question:
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- 30.
A research volunteer tells you they have been scanned many times for clinical reasons so there is no reason to re-evaluate this subject and they are cleared to enter the scanning room.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Implants and objects that are cleared for a 1.5T machine does not mean they are cleared for a 3T machine since it is twice the strength. Also some radiological exams resemble the MRI scanner, for example many times patients confuse MRI with CT.Rate this question:
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- 31.
You need to assign a scan number, you will need:
- A.
The last scan number and then add one
- B.
The PI's initals
- C.
The last volunteer number
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
To assign a scan number, you will need the last scan number and then add one to it. Additionally, you will need the PI's initials and the last volunteer number. Therefore, all of the above options are required to assign a scan number accurately.Rate this question:
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- 32.
Scan numbers look like
- A.
Scan number_project ID number_technologist's initals
- B.
Scan number_investigator's initials_project ID number
- C.
Scan number_subject number_investigator's initals
- D.
Project ID number_investigator's initials_your initals
Correct Answer
C. Scan number_subject number_investigator's initalsExplanation
The given answer suggests that the format for scan numbers includes the scan number, subject number, and investigator's initials. This format is likely used to identify and organize scans in a research or medical setting. The inclusion of the subject number helps to differentiate between different individuals or cases, while the investigator's initials provide information about the person responsible for the scan.Rate this question:
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- 33.
If a subject squeezes the emergency ball, you:
- A.
Press the red stop button and quench the magnet
- B.
Stop the scan, turn off the alarm and check in with the subject over the speaker
- C.
Stop the scan and run into the room and pull them from the table
- D.
Nothing, they probably squeezed the button by mistake
Correct Answer
B. Stop the scan, turn off the alarm and check in with the subject over the speaker -
- 34.
True or false - these are the things you will need to set up the subject on the table:
- Correct coil
- Knee pad under knees
- Ear plugs and/or head set
- Vitamin on left side of head
- Mirror so they can see the entire projection screen
- Emergency ball
- Response box (if needed)
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Vitamin should be on RIGHT side of headRate this question:
- 35.
Select the ones you like
- A.
Option1
- B.
Option2
- C.
Option3
- D.
Option4
Correct Answer
A. Option1Explanation
The correct answer is Option1. This suggests that out of the given options, Option1 is the preferred choice or the one that is most liked.Rate this question:
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- 36.
After the scan is done you:
- A.
Nothing you are done
- B.
Leave the scanner on so the technologist can push the images when they are in the office
- C.
Push study to KPACS and check all images have transfered
- D.
Push study to PACS and check all images have transfered
Correct Answer
C. Push study to KPACS and check all images have transferedExplanation
KPACS is the SCAN Center server, this is the correct answer. PACS is the hospital server, only clinical studies go there.Rate this question:
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- 37.
While scanning you see an abnormal growth in the brain, you:
- A.
Scream and pull the subject out right away
- B.
Tell the subject when they are done with the scan that they have something wrong
- C.
Nothing, we are not physicians
- D.
Make a note of it for the technologist to have a incidental finding read, say nothing to the subject
Correct Answer
D. Make a note of it for the technologist to have a incidental finding read, say nothing to the subjectExplanation
The correct answer is to make a note of the abnormal growth for the technologist to have it reviewed as an incidental finding, without informing the subject. As a non-physician, it is not the responsibility to immediately inform the subject or take any action. The abnormal growth should be properly evaluated by a medical professional before any conclusions or actions are taken.Rate this question:
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- 38.
Here are the steps to turning off the scanner
- A.
Press the system off button, power immediately goes off
- B.
Close the subject, go to the system-end session-system shut down and wait for scanner to let you know to switch power off
- C.
Never turn the scanner off
- D.
Close the subject, go to the system-end session-system shut down. Once the countdown on the screen starts you can turn off scanner
Correct Answer
B. Close the subject, go to the system-end session-system shut down and wait for scanner to let you know to switch power offExplanation
The correct answer suggests that the user should close the subject, go to the system-end session-system shut down, and wait for the scanner to indicate when to switch off the power. This implies that there is a specific process or sequence that needs to be followed in order to safely turn off the scanner. Simply pressing the system off button or turning off the scanner immediately is not recommended. The user should wait for the scanner to give instructions before switching off the power.Rate this question:
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- 39.
When you turn off the projector you should use the remote to turn off the lights and then wait 2-5 minutes for the fan to cool down the lamp before shutting off the main power
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
It is important to use the remote to turn off the lights when turning off the projector because it ensures that the proper sequence of shutting down the equipment is followed. By waiting for 2-5 minutes for the fan to cool down the lamp before shutting off the main power, it allows the lamp to cool down gradually, preventing any potential damage to the projector. Therefore, the statement is true.Rate this question:
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- 40.
The subject comes in with glasses and cannot see without them, you:
- A.
Don't worry about it, just make sure they fit in the coil
- B.
Use the MRI safe glasses, just pick any lens
- C.
Use the MRI safe glasses, fit them by testing out one at a time
- D.
Sorry no glasses can go into the scanner
Correct Answer
C. Use the MRI safe glasses, fit them by testing out one at a timeExplanation
The glasses are located in bottom left most cabinetRate this question:
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Mar 22, 2023Quiz Edited by
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