MRSO EXAM 3 NEWEST 2026 ACTUAL EXAM COMPLETE 300 QUESTIONS AND CORRECT
DETAILED ANSWERS/NEWEST UPDATE!!!
Question 1
Which of the following physiologic factors occur during a systemic anaphylactic reaction to a
contrast agent?
A) Elevated creatinine levels and renal failure
B) Vasodilation, bronchial smooth muscle contraction, and increased vascular permeability
C) Hypertension and bradycardia
D) Bronchial relaxation and decreased vascular permeability
E) Increased serum calcium and metabolic alkalosis
Correct Answer: B) Vasodilation, bronchial smooth muscle contraction, and increased
vascular permeability
Rationale: Anaphylaxis is a type I hypersensitivity reaction. It leads to the massive release of
histamine and other mediators, causing blood vessels to dilate (dropping blood pressure),
smooth muscles in the lungs to contract (wheezing), and capillaries to leak fluid into tissues
(edema).
Question 2
While an emergent quench of a superconducting magnet occurs rapidly, approximately how long
does a "non-emergent" or controlled quench take to complete?
A) 1 minute
B) 2-4 minutes
C) 5-15 minutes
D) 30-45 minutes
E) Over 1 hour
Correct Answer: C) 5-15 minutes
Rationale: In a non-emergent situation where the field needs to be ramped down, the
process is slower to prevent damage to the cryostat and coils. In contrast, an emergency
quench is designed to collapse the field in roughly one minute.
Question 3
What is the primary cause of the loud "roaring" sound heard during an MRI magnet quench?
A) The ignition of the superconducting wire coils
B) The massive volume of liquid helium boiling into gas and escaping through the quench vent
C) The emergency sirens on the MRI console
D) The mechanical vibration of the gradient coils hitting the gantry
E) The sudden release of compressed air from the HVAC system
Correct Answer: B) The massive volume of liquid helium boiling into gas and escaping
through the quench vent
Rationale: When the magnet loses superconductivity, the liquid helium heats up rapidly. It
expands by a factor of 700:1 as it turns into gas, creating a high-velocity roar as it is forced
through the exhaust plumbing.
, 2
Question 4
Which of the following actions is most effective in reducing the risk of a patient burn when an
internal pacing wire is present?
A) Advance the patient into the scanner head-first
B) Place an ice pack on the patient's chest during the scan
C) Ensure the pacing wire is placed outside the transmit RF field
D) Increase the flip angle to 180 degrees
E) Use a faster spin-echo sequence with high SAR
Correct Answer: C) Ensure the pacing wire is placed outside the transmit RF field
Rationale: RF heating occurs when conductive materials (like wires) are exposed to the B1
oscillating magnetic field. By positioning the patient so the wire is outside the RF transmit
zone, you eliminate the source of inductive heating.
Question 5
A patient has an abandoned vagus nerve stimulator (leads left in) and is scheduled for an MRI of
the knee using a local transmit-receive coil. Regarding patient heating, is this scan safe?
A) No, abandoned leads are always a contraindication.
B) Yes, but only if a heat sink is applied to the neck.
C) Yes, because the leads in the neck are not exposed to the RF energy from the knee coil.
D) Yes, but only if the patient is under 200 lbs.
E) No, because the static field will move the leads.
Correct Answer: C) Yes, because the leads in the neck are not exposed to the RF energy from
the knee coil.
Rationale: RF heating is a localized effect. When using a local transmit-receive coil (like a
knee coil), the RF energy is confined to the volume of the coil. Since the abandoned leads
are in the neck, far from the knee, they will not absorb RF energy and will not heat up.
Question 6
According to ACR safety standards, which of the following statements regarding personnel
screening is FALSE?
A) The screening process for non-MR personnel and MR personnel should be identical.
B) Unscreened patients should never enter Zone III.
C) The screening process for non-MR personnel and MR personnel should be different.
D) Zone IV is the primary responsibility of Level 2 personnel.
E) All personnel must be screened for ferromagnetic objects before entering Zone III.
Correct Answer: C) The screening process for non-MR personnel and MR personnel should
be different.
Rationale: Safety protocols require that everyone—staff, patients, and visitors—undergo
the same rigorous screening process to ensure no dangerous metallic objects are introduced
into the magnetic environment.
, 3
Question 7
In terms of MR staffing and safety, which of the following is considered a true statement?
A) Level 1 personnel may scan a patient to relieve a Level 2 technologist.
B) A pregnant patient is never allowed to undergo an MR exam.
C) A Level 1 or 2 personnel should be available to help an MR technologist in Zone IV in non-
emergent situations.
D) All Level 2 personnel are required to be licensed MR technologists.
E) Patients can be left alone in Zone IV if the door is closed.
Correct Answer: C) A Level 1 or 2 personnel should be available to help an MR technologist
in Zone IV in non-emergent situations.
Rationale: ACR recommendations suggest that a minimum of two MR-trained individuals
(at least one Level 2) should be present at the facility to ensure safety and assistance during
procedures.
Question 8
The "Lorentz Force" is the physical principle primarily responsible for describing:
A) Translational force on an oxygen tank
B) The loud acoustic noise produced by the gradient coils during a scan
C) Peripheral nerve stimulation in the patient's legs
D) Resonant heating of a heart stent
E) The chemical stability of Gadolinium
Correct Answer: B) The loud acoustic noise produced by the gradient coils during a scan
Rationale: Lorentz force occurs when an electric current (in the gradient coil) passes
through a magnetic field (B0). This causes the coils to physically vibrate and tap against the
gantry, creating acoustic noise.
Question 9
Compared to a contrast media with low relaxivity, a contrast media with "high relaxivity" will:
A) Produce more signal per unit of Gadolinium
B) Produce less signal and more noise
C) Improve spatial resolution but decrease contrast
D) Require a much higher dose to be effective
E) Be more likely to cause NSF
Correct Answer: A) Produce more signal per unit of Gadolinium
Rationale: Relaxivity (r1 and r2) is a measure of how effectively a contrast agent shortens
the relaxation times of nearby water protons. High relaxivity agents produce a brighter
signal on T1-weighted images at lower concentrations.
Question 10
If an MRI room experiences a quench and the vent system fails, the door may become "pressure-
locked." What is the emergency protocol to reduce room pressure?
, 4
A) Drill a hole through the RF shield in the wall
B) Wait 20 minutes for the helium gas to liquefy
C) Attempt to pull the door open using a winch
D) Break the control room window to Zone IV
E) Turn off the air conditioning
Correct Answer: D) Break the control room window to Zone IV
Rationale: If the helium gas vents into the room, it creates positive pressure. Because MR
doors usually open inward, they cannot be opened until the pressure is equalized. Breaking
the window is the fastest way to vent the room and allow for rescue.
Question 11
Which of the following physiological concerns can be directly triggered by the time-varying
gradient magnetic fields (dB/dt)?
A) Anaphylaxis
B) Diaphragm contractions and respiratory distress
C) Difficulty swallowing (dysphagia)
D) Sudden drop in blood glucose
E) Increased risk of skin cancer
Correct Answer: B) Diaphragm contractions and respiratory distress
Rationale: Rapidly changing gradients can induce electrical currents in the body. If these
currents stimulate the phrenic nerve or the diaphragm muscle directly, it can cause
involuntary contractions, making it difficult for the patient to breathe.
Question 12
In the environment surrounding an MRI unit, where is the highest "spatial magnetic gradient"
(dB/dx) typically located?
A) At the 5 Gauss line in the hallway
B) Directly at the isocenter of the magnet
C) Near the MR table control panel/portal of the magnet
D) Inside the computer equipment room
E) Underneath the patient's feet
Correct Answer: C) Near the MR table control panel/portal of the magnet
Rationale: The spatial gradient refers to how quickly the magnetic field changes over
distance. It is zero at the isocenter (where the field is uniform) and reaches its maximum
value just as you enter the bore of the magnet.
Question 13
When performing an MR Pelvis on a patient with various implants, which of the following
would produce the largest susceptibility artifact?
A) Titanium hip replacement
B) Ureter stent made of plastic
DETAILED ANSWERS/NEWEST UPDATE!!!
Question 1
Which of the following physiologic factors occur during a systemic anaphylactic reaction to a
contrast agent?
A) Elevated creatinine levels and renal failure
B) Vasodilation, bronchial smooth muscle contraction, and increased vascular permeability
C) Hypertension and bradycardia
D) Bronchial relaxation and decreased vascular permeability
E) Increased serum calcium and metabolic alkalosis
Correct Answer: B) Vasodilation, bronchial smooth muscle contraction, and increased
vascular permeability
Rationale: Anaphylaxis is a type I hypersensitivity reaction. It leads to the massive release of
histamine and other mediators, causing blood vessels to dilate (dropping blood pressure),
smooth muscles in the lungs to contract (wheezing), and capillaries to leak fluid into tissues
(edema).
Question 2
While an emergent quench of a superconducting magnet occurs rapidly, approximately how long
does a "non-emergent" or controlled quench take to complete?
A) 1 minute
B) 2-4 minutes
C) 5-15 minutes
D) 30-45 minutes
E) Over 1 hour
Correct Answer: C) 5-15 minutes
Rationale: In a non-emergent situation where the field needs to be ramped down, the
process is slower to prevent damage to the cryostat and coils. In contrast, an emergency
quench is designed to collapse the field in roughly one minute.
Question 3
What is the primary cause of the loud "roaring" sound heard during an MRI magnet quench?
A) The ignition of the superconducting wire coils
B) The massive volume of liquid helium boiling into gas and escaping through the quench vent
C) The emergency sirens on the MRI console
D) The mechanical vibration of the gradient coils hitting the gantry
E) The sudden release of compressed air from the HVAC system
Correct Answer: B) The massive volume of liquid helium boiling into gas and escaping
through the quench vent
Rationale: When the magnet loses superconductivity, the liquid helium heats up rapidly. It
expands by a factor of 700:1 as it turns into gas, creating a high-velocity roar as it is forced
through the exhaust plumbing.
, 2
Question 4
Which of the following actions is most effective in reducing the risk of a patient burn when an
internal pacing wire is present?
A) Advance the patient into the scanner head-first
B) Place an ice pack on the patient's chest during the scan
C) Ensure the pacing wire is placed outside the transmit RF field
D) Increase the flip angle to 180 degrees
E) Use a faster spin-echo sequence with high SAR
Correct Answer: C) Ensure the pacing wire is placed outside the transmit RF field
Rationale: RF heating occurs when conductive materials (like wires) are exposed to the B1
oscillating magnetic field. By positioning the patient so the wire is outside the RF transmit
zone, you eliminate the source of inductive heating.
Question 5
A patient has an abandoned vagus nerve stimulator (leads left in) and is scheduled for an MRI of
the knee using a local transmit-receive coil. Regarding patient heating, is this scan safe?
A) No, abandoned leads are always a contraindication.
B) Yes, but only if a heat sink is applied to the neck.
C) Yes, because the leads in the neck are not exposed to the RF energy from the knee coil.
D) Yes, but only if the patient is under 200 lbs.
E) No, because the static field will move the leads.
Correct Answer: C) Yes, because the leads in the neck are not exposed to the RF energy from
the knee coil.
Rationale: RF heating is a localized effect. When using a local transmit-receive coil (like a
knee coil), the RF energy is confined to the volume of the coil. Since the abandoned leads
are in the neck, far from the knee, they will not absorb RF energy and will not heat up.
Question 6
According to ACR safety standards, which of the following statements regarding personnel
screening is FALSE?
A) The screening process for non-MR personnel and MR personnel should be identical.
B) Unscreened patients should never enter Zone III.
C) The screening process for non-MR personnel and MR personnel should be different.
D) Zone IV is the primary responsibility of Level 2 personnel.
E) All personnel must be screened for ferromagnetic objects before entering Zone III.
Correct Answer: C) The screening process for non-MR personnel and MR personnel should
be different.
Rationale: Safety protocols require that everyone—staff, patients, and visitors—undergo
the same rigorous screening process to ensure no dangerous metallic objects are introduced
into the magnetic environment.
, 3
Question 7
In terms of MR staffing and safety, which of the following is considered a true statement?
A) Level 1 personnel may scan a patient to relieve a Level 2 technologist.
B) A pregnant patient is never allowed to undergo an MR exam.
C) A Level 1 or 2 personnel should be available to help an MR technologist in Zone IV in non-
emergent situations.
D) All Level 2 personnel are required to be licensed MR technologists.
E) Patients can be left alone in Zone IV if the door is closed.
Correct Answer: C) A Level 1 or 2 personnel should be available to help an MR technologist
in Zone IV in non-emergent situations.
Rationale: ACR recommendations suggest that a minimum of two MR-trained individuals
(at least one Level 2) should be present at the facility to ensure safety and assistance during
procedures.
Question 8
The "Lorentz Force" is the physical principle primarily responsible for describing:
A) Translational force on an oxygen tank
B) The loud acoustic noise produced by the gradient coils during a scan
C) Peripheral nerve stimulation in the patient's legs
D) Resonant heating of a heart stent
E) The chemical stability of Gadolinium
Correct Answer: B) The loud acoustic noise produced by the gradient coils during a scan
Rationale: Lorentz force occurs when an electric current (in the gradient coil) passes
through a magnetic field (B0). This causes the coils to physically vibrate and tap against the
gantry, creating acoustic noise.
Question 9
Compared to a contrast media with low relaxivity, a contrast media with "high relaxivity" will:
A) Produce more signal per unit of Gadolinium
B) Produce less signal and more noise
C) Improve spatial resolution but decrease contrast
D) Require a much higher dose to be effective
E) Be more likely to cause NSF
Correct Answer: A) Produce more signal per unit of Gadolinium
Rationale: Relaxivity (r1 and r2) is a measure of how effectively a contrast agent shortens
the relaxation times of nearby water protons. High relaxivity agents produce a brighter
signal on T1-weighted images at lower concentrations.
Question 10
If an MRI room experiences a quench and the vent system fails, the door may become "pressure-
locked." What is the emergency protocol to reduce room pressure?
, 4
A) Drill a hole through the RF shield in the wall
B) Wait 20 minutes for the helium gas to liquefy
C) Attempt to pull the door open using a winch
D) Break the control room window to Zone IV
E) Turn off the air conditioning
Correct Answer: D) Break the control room window to Zone IV
Rationale: If the helium gas vents into the room, it creates positive pressure. Because MR
doors usually open inward, they cannot be opened until the pressure is equalized. Breaking
the window is the fastest way to vent the room and allow for rescue.
Question 11
Which of the following physiological concerns can be directly triggered by the time-varying
gradient magnetic fields (dB/dt)?
A) Anaphylaxis
B) Diaphragm contractions and respiratory distress
C) Difficulty swallowing (dysphagia)
D) Sudden drop in blood glucose
E) Increased risk of skin cancer
Correct Answer: B) Diaphragm contractions and respiratory distress
Rationale: Rapidly changing gradients can induce electrical currents in the body. If these
currents stimulate the phrenic nerve or the diaphragm muscle directly, it can cause
involuntary contractions, making it difficult for the patient to breathe.
Question 12
In the environment surrounding an MRI unit, where is the highest "spatial magnetic gradient"
(dB/dx) typically located?
A) At the 5 Gauss line in the hallway
B) Directly at the isocenter of the magnet
C) Near the MR table control panel/portal of the magnet
D) Inside the computer equipment room
E) Underneath the patient's feet
Correct Answer: C) Near the MR table control panel/portal of the magnet
Rationale: The spatial gradient refers to how quickly the magnetic field changes over
distance. It is zero at the isocenter (where the field is uniform) and reaches its maximum
value just as you enter the bore of the magnet.
Question 13
When performing an MR Pelvis on a patient with various implants, which of the following
would produce the largest susceptibility artifact?
A) Titanium hip replacement
B) Ureter stent made of plastic
