Nih Clinical Center, MRI Safety Test
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- 1.
The major risk of injury or harm due to magnet quench is:
- A.
If the cryogenic helium is not vented outside of the MRI room properly, the helium can displace the oxygen in the room, leading to possible asphyxiation.
- B.
Sudden heating of the magnet may cause burns to patients in the bore.
- C.
Electrocution by arcing of electricity across the main magnet windings.
- D.
Blinding flash of light.
Correct Answer
A. If the cryogenic helium is not vented outside of the MRI room properly, the helium can displace the oxygen in the room, leading to possible asphyxiation.Explanation
If the cryogenic helium is not vented outside of the MRI room properly, it can displace the oxygen in the room. This can lead to a lack of oxygen, which can cause asphyxiation. Asphyxiation is a major risk of injury or harm due to magnet quench.Rate this question:
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- 2.
When does a patient need to have orbital xrays taken prior to having an MRI?
- A.
When the patient has had any type of eye surgery.
- B.
When the patient has a false eye.
- C.
When the patient has a history of foreign body in the orbit
- D.
Xrays are NEVER a necessary requirement prior to an MRI.
Correct Answer
C. When the patient has a history of foreign body in the orbitExplanation
When a patient has a history of a foreign body in the orbit, it is necessary to have orbital xrays taken prior to having an MRI. This is because the presence of a foreign body can interfere with the MRI imaging and may cause complications during the procedure. By obtaining xrays, the healthcare provider can assess the location and nature of the foreign body, which helps in planning the MRI scan and ensuring the safety of the patient.Rate this question:
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- 3.
When the scanner is off, it is safe to bring items into the room that are ferrous (ie. floor cleaners/vacuums etc).
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
When the scanner is off, it is not safe to bring items into the room that are ferrous. Ferrous materials contain iron and can be attracted to the scanner's magnetic field, potentially causing damage to the scanner or affecting its performance. Therefore, it is not recommended to bring ferrous items into the room when the scanner is off.Rate this question:
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- 4.
Critical patients (ie. from the ICU) can still be monitored during the MRI exam.
- A.
They can still use the same monitoring equipment that they are connected to.
- B.
This is a false statement. No monitoring is allowed in the MRI scanner.
- C.
Only MRI compatible monitoring can be used.
Correct Answer
C. Only MRI compatible monitoring can be used.Explanation
The explanation for the given correct answer is that only MRI compatible monitoring can be used during an MRI exam. Critical patients from the ICU cannot use the same monitoring equipment that they are connected to because regular monitoring equipment is not safe to use in the MRI scanner. MRI compatible monitoring equipment is specifically designed to be safe in the strong magnetic field of the MRI machine. Therefore, the statement that critical patients can still be monitored during the MRI exam with the same equipment is false.Rate this question:
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- 5.
Quench refers to (pick the best answer):
- A.
An emergency procedure that runs the magnetic field to ZERO
- B.
Standard condition that patients complain of after being in a magnetic field for longer than 2 hrs at a time.
- C.
What Gatorade does to thirst
Correct Answer
A. An emergency procedure that runs the magnetic field to ZEROExplanation
Quench refers to an emergency procedure that runs the magnetic field to ZERO. This means that in certain situations, it is necessary to rapidly reduce or eliminate the magnetic field in order to prevent any potential hazards or damage. This procedure is typically performed in situations such as equipment malfunction or when there is a risk of overheating. It is an important safety measure to ensure the well-being of individuals and the proper functioning of the magnetic field system.Rate this question:
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- 6.
People have died as a result of MRI safety measures being neglected.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement "People have died as a result of MRI safety measures being neglected" is true. Neglecting safety measures in MRI procedures can lead to serious accidents and even fatalities. MRI machines use strong magnetic fields that can cause metal objects to become projectiles, leading to severe injuries or death if proper safety protocols are not followed. Additionally, patients with certain medical conditions or implanted devices may be at risk if safety guidelines are ignored. Therefore, it is crucial to prioritize and adhere to MRI safety measures to prevent any potential harm to individuals.Rate this question:
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- 7.
The American College of Radiology has instituted 5 separate safety zones around magnetic environments in order improve the safe use of the device.
- A.
Yes
- B.
No, there are only 3 Safety Zones.
- C.
No, there are only 4 Safety Zones.
Correct Answer
C. No, there are only 4 Safety Zones.Explanation
The given answer states that there are only 4 safety zones, which contradicts the information provided in the question. The question clearly states that the American College of Radiology has instituted 5 separate safety zones around magnetic environments. Therefore, the answer is incorrect.Rate this question:
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- 8.
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.
Explosion
- B.
Asphyxiation and Frost Bite
- C.
Fire
- D.
Convulsions
Correct Answer
B. Asphyxiation and Frost BiteExplanation
If there is a quench in the scan room instead of the outside environment, the safety concerns are asphyxiation and frostbite. A quench refers to the sudden release of cryogens, such as liquid helium, which are used to cool the magnets in an MRI machine. This release can cause a rapid decrease in oxygen levels in the room, leading to asphyxiation. Additionally, the cryogens can cause severe cold burns on contact with the skin, resulting in frostbite. Therefore, it is crucial to evacuate the patient and all staff from the room immediately to prevent these potential dangers.Rate this question:
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- 9.
Who needs to be cleared before they enter the MRI scanning room (pick the best answer)?
- A.
The MRI Technologist
- B.
The Nurse
- C.
Everyone
- D.
The patient
Correct Answer
C. EveryoneExplanation
In order to ensure the safety and proper functioning of the MRI scanning room, it is necessary for everyone to be cleared before entering. This includes not only the MRI Technologist and the Nurse, but also the patient and any other individuals who may be present in the room. This is important because the strong magnetic field generated by the MRI machine can pose risks to individuals with certain medical devices or metal objects in their bodies. Therefore, it is crucial to clear everyone to prevent any potential harm or interference during the MRI scanning process.Rate this question:
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- 10.
If you are not sure if an item is MRI compatible (or MRI conditional), it is best to:
- A.
Hold onto the device very tightly, and walk it into the magnetic field
- B.
Review the device with the MRI Technologist or Safety officer
- C.
Scan the device based on your personal knowledge
- D.
Scan the device ONLY at the highest field strength
Correct Answer
B. Review the device with the MRI Technologist or Safety officerExplanation
The best course of action when unsure about the MRI compatibility of a device is to review it with the MRI Technologist or Safety officer. These professionals have the knowledge and expertise to assess the device and determine if it is safe to bring into the magnetic field. Holding onto the device tightly and walking it into the field without proper evaluation can be dangerous. Scanning the device based on personal knowledge or scanning it at the highest field strength without proper evaluation can also pose risks. Therefore, consulting the MRI Technologist or Safety officer is the most appropriate step to ensure safety.Rate this question:
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- 11.
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
The statement is false because even though the research volunteer has been scanned many times for clinical reasons, it does not mean that there is no reason to re-evaluate the subject. Each scanning session may have different objectives or requirements, and it is important to ensure that the subject is still suitable and safe for the current scanning session. Therefore, re-evaluation is necessary to ensure the volunteer's well-being and the accuracy of the research results.Rate this question:
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- 12.
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
We require double ear protection in the form of ear plugs as well as noise cancelling head phones.Rate this question:
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- 13.
The main hazard of the Static Field is:
- A.
Heat Deposition
- B.
Nerve Stimulation
- C.
Objects becoming projectiles
- D.
None of these are correct
Correct Answer
C. Objects becoming projectilesExplanation
The main hazard of the Static Field is objects becoming projectiles. This means that when there is a static field present, objects in the vicinity can be attracted to or repelled from the field, causing them to become airborne and potentially pose a danger to people or property. This hazard can occur in various situations where static electricity is present, such as in industrial settings or during electrical storms. It is important to be aware of this risk and take appropriate precautions to prevent accidents or injuries.Rate this question:
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- 14.
In the event your subject is in some type of medical distress, what is the first thing you should do?
- A.
Bring the crash cart into the scan room, then call 111
- B.
Call 911, and remove the patient from the scanner room immediately
- C.
Call 111, and remove the patient from the scanner room immediately
Correct Answer
C. Call 111, and remove the patient from the scanner room immediatelyExplanation
In the event of a medical distress, the first priority should be to ensure the safety of the patient. Calling emergency services, such as 111 or 911, is crucial to getting immediate medical help. Removing the patient from the scanner room is also important as it allows for easier access and assessment by medical professionals. Bringing the crash cart into the scan room may not be necessary or appropriate in this situation, as the priority is to get the patient to a safe and suitable environment for medical attention.Rate this question:
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- 15.
The magnetic field is contained within the center of the bore, it does not extend outside the bore.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the magnetic field does extend outside the bore. Magnetic fields are three-dimensional and can extend beyond the physical boundaries of an object. In the case of a magnetic bore, the magnetic field lines will extend both inside and outside the bore.Rate this question:
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- 16.
Our department has a policy for patients with tattoos. Which describes it best below?
- A.
Wrap the tattoo in a cool, damp compress prior to beginning the MRI
- B.
Do nothing. Tattoos are safe
- C.
Cancel the exam. Patients with tattoos (less than a year old) should NOT be scanned.
- 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
The correct answer suggests that the department's policy for patients with tattoos is to inform them about the rare cases where tattoos can cause tingling or burning sensations. Patients should be made aware that if they are not comfortable continuing with the study due to these sensations, they have the option to back out. This policy ensures that patients are well-informed and have the autonomy to make decisions about their own comfort during the study.Rate this question:
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- 17.
Which of the following is a likely consequence of forgetting to remove your wallet from your pocket before entering the scan room
- A.
There should be no issue
- B.
The wallet may heat up, and cause local burning/heating.
- C.
The ink in US currency has metal flecks, and may become a projectile
- D.
Erasing of all magnetic strips (on bank cards/credit cards) may occur
Correct Answer
D. Erasing of all magnetic strips (on bank cards/credit cards) may occurExplanation
Forgetting to remove your wallet from your pocket before entering the scan room can lead to the erasing of all magnetic strips on bank cards/credit cards. This is because the scan room may contain strong magnetic fields that can interfere with the magnetic strips on the cards, causing them to be erased.Rate this question:
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- 18.
What does SAR measure?
- A.
The magnetic Fringe field
- B.
The amount of RF energy that is deposited into the patient.
- C.
The length of the scan.
- D.
Special Aluminum Requirements
Correct Answer
B. The amount of RF energy that is deposited into the patient.Explanation
SAR stands for Specific Absorption Rate, which is a measure of the amount of RF (radio frequency) energy that is absorbed by the body when exposed to electromagnetic fields. It quantifies the rate at which energy is deposited into the patient's tissues, helping to ensure that the levels are within safe limits. SAR is an important parameter in medical imaging, as excessive RF energy absorption can lead to tissue heating and potential harm to the patient.Rate this question:
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- 19.
When administering IV Gadolinium, the Technologist must be on the look out for RISK factors that would PRECLUDE a patient from getting Gadolinium. If a patient has any one of these risk factors, a serum creatinine and eGFR must be obtained PRIOR to imaging. Click on EACH risk factor that the Technologist must look out for:
- A.
Diabetes
- B.
History of Liver or Renal Diseas
- C.
Over the age of 60
- D.
Impotence
- E.
Known history of renal failure
- F.
Patients in renal failure, or on dialysis
Correct Answer(s)
A. Diabetes
B. History of Liver or Renal Diseas
C. Over the age of 60
E. Known history of renal failure
F. Patients in renal failure, or on dialysisExplanation
The Technologist must look out for the risk factors of Diabetes, History of Liver or Renal Disease, Over the age of 60, Known history of renal failure, and Patients in renal failure or on dialysis when administering IV Gadolinium. If a patient has any of these risk factors, a serum creatinine and eGFR must be obtained prior to imaging.Rate this question:
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- 20.
What is our departmental policy on scanning patients with intravascular STENTS?
- A.
We can only scan patients with stents 6 weeks post implantation.
- B.
We scan all stents, regardless of when they were implanted.
- C.
We can NOT scan patients who have drug eluting stents.
- D.
We can only scan patients with stents 8 weeks post implantation.
Correct Answer
B. We scan all stents, regardless of when they were implanted.Explanation
The correct answer is "We scan all stents, regardless of when they were implanted." This means that the department policy allows for scanning patients with intravascular stents at any time, regardless of how long ago the stents were implanted. There are no specific time restrictions mentioned in the policy. Additionally, there is no mention of any restrictions related to drug-eluting stents, so they are not excluded from being scanned.Rate this question:
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- 21.
The best definition for MR safety zone III is
- A.
The interface between the publicly accessible and the strictly controlled regions
- B.
The region that leads to the MR scanner and only MR personnel have access to it.
- C.
All areas that are outside the MR environment and freely accessible to the general public.
- D.
Area that is synonymous with the MR scanner magnet room itself.
Correct Answer
B. The region that leads to the MR scanner and only MR personnel have access to it.Explanation
The correct answer is "the region that leads to the MR scanner and only MR personnel have access to it." This definition refers to MR safety zone III, which is the area that leads to the MR scanner and is restricted to only MR personnel. This zone is typically located between the publicly accessible areas and the strictly controlled regions of the MR environment. It ensures that only trained personnel with proper authorization can enter the area where the MR scanner is located, ensuring safety and security.Rate this question:
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- 22.
There are different screening process and screening forms for patients, non-MR personnel and MR personnel.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is incorrect. There are not different screening processes and screening forms for patients, non-MR personnel, and MR personnel. The screening process and forms may vary depending on the specific situation or facility, but there is typically a standardized screening process and form for all individuals, regardless of their role or status.Rate this question:
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- 23.
Concerning MR screening, which statement is true?
- A.
Only patients require screening
- B.
Non-MR personnel employees who have been working in the MR environment can be exempted from screening
- C.
Non-emergent patients and research and volunteer subjects are to complete written MR safety screening questionnaires before their introduction to Zone III.
- D.
Everyone needs MRI screening.
Correct Answer
D. Everyone needs MRI screening.Explanation
The correct answer is "Everyone needs MRI screening." This means that all individuals, including patients, non-MR personnel employees, non-emergent patients, research subjects, and volunteer subjects, are required to undergo MRI screening. This ensures that everyone entering the MR environment is assessed for any potential risks or contraindications that could affect their safety during the procedure.Rate this question:
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- 24.
Concerning external ferromagnetic devices brought into zone III, which statement is true?
- A.
They cannot be brought into zone III at all
- B.
They can still be brought into zone III if they are deemed by MR personnel to be necessary for patient care
- C.
MR personnel should supervise but the person who brings the device is responsible for the safe usage.
- D.
All devices are safe at zone III.
Correct Answer
B. They can still be brought into zone III if they are deemed by MR personnel to be necessary for patient careExplanation
External ferromagnetic devices can still be brought into zone III if they are deemed necessary for patient care by MR personnel. This indicates that there may be certain circumstances where the benefits of using these devices outweigh the potential risks associated with their presence in the MRI environment. However, it is important to note that MR personnel should supervise the usage of these devices, and the person bringing the device is responsible for ensuring its safe usage.Rate this question:
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- 25.
Concerning moving a large metallic, but nonferromagnetic oxygen tank that is taken into the scanning room, which statement is true?
- A.
You will still feel a force being applied to the nonmagnetic device due to Lenz's law
- B.
The tank might be heated by the magnetic field.
- C.
That might pose a projectile hazard.
- D.
Since it is nonferromagnetic, there is no concern of MR safety.
Correct Answer
A. You will still feel a force being applied to the nonmagnetic device due to Lenz's lawExplanation
When a large metallic, nonferromagnetic oxygen tank is taken into the scanning room, it will still experience a force due to Lenz's law. Lenz's law states that when a changing magnetic field passes through a conductor, it induces an electromotive force (EMF) that opposes the change. In this case, the magnetic field generated by the MRI machine will induce an EMF in the oxygen tank, causing a force to be applied to it. This force can be felt by the person moving the tank.Rate this question:
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Mar 20, 2023Quiz Edited by
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