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MRI physics Final Exam Questions With
Correct Answers 100% Verified.
What type of nonionizing electromagnetic radiation does MRI utilize? - Answer✔Radio
Frequency
Preventing potential serious injury or death from strong magnetic field strengths requires:
1. a knowledgeable and mindful MR technologist
2. Controlled access to the magnetic field
3. a detailed medical history of anyone entering the room - Answer✔1, 2, and 3
When protons spin in place within an atom, they create:
a. a small magnetic field
b. an electrical charge
c. pressure on the electrons
d. a small hydrogen moment - Answer✔a. a small magnetic field
The process of producing voltage using magnetic fields is called:
a. static electricity production
b. non-magnetic generation
c. electromagnetic induction
d. the Larmar equation - Answer✔c. electromagnetic induction
The steepness of the gradient slope or the power of the gradient is termed the:
a. gradient direction
b. gradient amplitude
c. gradient rise time
d. gradient slew rate - Answer✔B. gradient amplitude
1 Tesla is equal to _________ Gauss. - Answer✔10,000
1|Page
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The static magnetic field of a permanent magnet generally follows which direction?
a. Vertically from the ceiling to the floor
b. horizontally from the inner bore to the wall
c. horizontally along the long axis of the patients body in the bore
d. in a straight line from the inner bore to the wall perpendicular to the bore - Answer✔a.
vertically from the ceiling to the floor
Precessional frequency is determined by the ___________ equation.
a. Precessional
b. Magnetic Frequency
c. Larmor
d. Faraday - Answer✔c. Larmor
Adding additional electrical coils to maintain magnetic field homogeneity is called:
a. active shimming
b. active shielding
c. passive shimming
d. gross adjustments - Answer✔a. active shimming
The ________ line is a perimeter around the scanner defining where the static field is potentially
hazardous (near the foot end of tabletop)
a. 3.0 T line
b. 3-gauss circle
c. 1.5 T circle
d. 5-gauss line - Answer✔d. 5-gauss line
The rapid loss of voltage induced within the coil after the RF excitation due to relaxation is
called:
a. longitudinal precession
b. transverse magnetization
c. repetition time
d. free induction decay - Answer✔free induction decay
A superconducting magnetic field generally flows:
a. horizontally through the bore of the magnet
2|Page
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b. from the inner bore to the floor
c. in a diagonal line from the bore to the floor
d. vertically from the ceiling to the floor - Answer✔horizontally through the bore of the magnet
what is used to cool the wires of superconducting magnets?
a. solid hydrogen blocks
b. special electrical fans
c. liquid cryogens
d. synthetic antifreeze - Answer✔liquid cryogens
Why are hydrogen protons predominately used to create MR images?
1. they have an odd number of protons
2. they are abundant in the human body
3. they are negatively charged - Answer✔1 and 2
More hydrogen protons are aligned parallel to the main magnetic field in the ________ energy
state.
a. high
b. medium
c. average
d. low - Answer✔low
T/F If working with a magnetically shielded MR system, one does not have to be as careful about
bringing ferrous objects around the magnet. - Answer✔False
Which of the following statements is true regarding resistive magnets?
a. resistive magnets have higher field strengths than Superconducting Magnets
b. They are commonly used in trauma hospitals
c. they tend to inexpensive to operate
d. resistive magnets can be shut off easily by discontinuing the power - Answer✔resistive
magnets can be shut off easily by discontinuing the power
In a well-known accident that occurred in July 2001, __________ flew through the scanner
room, striking and killing a 6-year-old boy.
a. an emergency crash cart
b. a set of forceps
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c. a wheelchair
d. an oxygen tank - Answer✔d. an oxygen tank
What is the absorption rate averaged over the entire body or over a small sample volume termed?
a. RF absorption rate
b. specific absorption rate
c. global absorption rate
d. total RF absorption rate - Answer✔b. Specific Absorption Rate
Coils used within the MR imaging process typically are used to:
a. return signal
b. alter signal
c. receive signal
d. validate signal measurements - Answer✔receive signal
The gradient field can potentially stimulate a patient's _________.
a. dreams
b. skin temperature
c. peripheral nerves
d. eyesight - Answer✔peripheral nerves
SAR is an abbreviation for: - Answer✔Specific Absorption Rate
Which of the zones established by the ACR regarding MR safely, houses the actual magnet? -
Answer✔Zone 4
According to ACR safety guidelines, Level 1 MR personnel have :
a. been thoroughly trained in MR safety
b. extensively trained MR safety and in full control of the Zones
c. participated in minimal MR safety educational programs
d. no training - Answer✔participated in minimal MR safety educational programs
T/F Parents who enter the MR scanning room with their children do NOT need to go through the
entire safety screening process. - Answer✔false
Which magnet field involved in MRI imaging is a TVMF?
a. gradient magnet
b. RF magnet
4|Page
MRI physics Final Exam Questions With
Correct Answers 100% Verified.
What type of nonionizing electromagnetic radiation does MRI utilize? - Answer✔Radio
Frequency
Preventing potential serious injury or death from strong magnetic field strengths requires:
1. a knowledgeable and mindful MR technologist
2. Controlled access to the magnetic field
3. a detailed medical history of anyone entering the room - Answer✔1, 2, and 3
When protons spin in place within an atom, they create:
a. a small magnetic field
b. an electrical charge
c. pressure on the electrons
d. a small hydrogen moment - Answer✔a. a small magnetic field
The process of producing voltage using magnetic fields is called:
a. static electricity production
b. non-magnetic generation
c. electromagnetic induction
d. the Larmar equation - Answer✔c. electromagnetic induction
The steepness of the gradient slope or the power of the gradient is termed the:
a. gradient direction
b. gradient amplitude
c. gradient rise time
d. gradient slew rate - Answer✔B. gradient amplitude
1 Tesla is equal to _________ Gauss. - Answer✔10,000
1|Page
, ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED 1/28/2025.
The static magnetic field of a permanent magnet generally follows which direction?
a. Vertically from the ceiling to the floor
b. horizontally from the inner bore to the wall
c. horizontally along the long axis of the patients body in the bore
d. in a straight line from the inner bore to the wall perpendicular to the bore - Answer✔a.
vertically from the ceiling to the floor
Precessional frequency is determined by the ___________ equation.
a. Precessional
b. Magnetic Frequency
c. Larmor
d. Faraday - Answer✔c. Larmor
Adding additional electrical coils to maintain magnetic field homogeneity is called:
a. active shimming
b. active shielding
c. passive shimming
d. gross adjustments - Answer✔a. active shimming
The ________ line is a perimeter around the scanner defining where the static field is potentially
hazardous (near the foot end of tabletop)
a. 3.0 T line
b. 3-gauss circle
c. 1.5 T circle
d. 5-gauss line - Answer✔d. 5-gauss line
The rapid loss of voltage induced within the coil after the RF excitation due to relaxation is
called:
a. longitudinal precession
b. transverse magnetization
c. repetition time
d. free induction decay - Answer✔free induction decay
A superconducting magnetic field generally flows:
a. horizontally through the bore of the magnet
2|Page
, ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED 1/28/2025.
b. from the inner bore to the floor
c. in a diagonal line from the bore to the floor
d. vertically from the ceiling to the floor - Answer✔horizontally through the bore of the magnet
what is used to cool the wires of superconducting magnets?
a. solid hydrogen blocks
b. special electrical fans
c. liquid cryogens
d. synthetic antifreeze - Answer✔liquid cryogens
Why are hydrogen protons predominately used to create MR images?
1. they have an odd number of protons
2. they are abundant in the human body
3. they are negatively charged - Answer✔1 and 2
More hydrogen protons are aligned parallel to the main magnetic field in the ________ energy
state.
a. high
b. medium
c. average
d. low - Answer✔low
T/F If working with a magnetically shielded MR system, one does not have to be as careful about
bringing ferrous objects around the magnet. - Answer✔False
Which of the following statements is true regarding resistive magnets?
a. resistive magnets have higher field strengths than Superconducting Magnets
b. They are commonly used in trauma hospitals
c. they tend to inexpensive to operate
d. resistive magnets can be shut off easily by discontinuing the power - Answer✔resistive
magnets can be shut off easily by discontinuing the power
In a well-known accident that occurred in July 2001, __________ flew through the scanner
room, striking and killing a 6-year-old boy.
a. an emergency crash cart
b. a set of forceps
3|Page
, ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED 1/28/2025.
c. a wheelchair
d. an oxygen tank - Answer✔d. an oxygen tank
What is the absorption rate averaged over the entire body or over a small sample volume termed?
a. RF absorption rate
b. specific absorption rate
c. global absorption rate
d. total RF absorption rate - Answer✔b. Specific Absorption Rate
Coils used within the MR imaging process typically are used to:
a. return signal
b. alter signal
c. receive signal
d. validate signal measurements - Answer✔receive signal
The gradient field can potentially stimulate a patient's _________.
a. dreams
b. skin temperature
c. peripheral nerves
d. eyesight - Answer✔peripheral nerves
SAR is an abbreviation for: - Answer✔Specific Absorption Rate
Which of the zones established by the ACR regarding MR safely, houses the actual magnet? -
Answer✔Zone 4
According to ACR safety guidelines, Level 1 MR personnel have :
a. been thoroughly trained in MR safety
b. extensively trained MR safety and in full control of the Zones
c. participated in minimal MR safety educational programs
d. no training - Answer✔participated in minimal MR safety educational programs
T/F Parents who enter the MR scanning room with their children do NOT need to go through the
entire safety screening process. - Answer✔false
Which magnet field involved in MRI imaging is a TVMF?
a. gradient magnet
b. RF magnet
4|Page
