2025 MRI PHYSICS FINAL ACTUAL EXAM QUESTIONS WITH
ANSWERS 2025/2026 GRADED A+
More hydrogen protons are aligned parallel to the main magnetic field in the ________
energy state.
a. high
b. medium
c. average
d. low - 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. - 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 - 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
c. a wheelchair
d. an oxygen tank - 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 - 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 - receive signal
The gradient field can potentially stimulate a patient's _________.
a. dreams
b. skin temperature
c. peripheral nerves
d. eyesight - peripheral nerves
,SAR is an abbreviation for: - Specific Absorption Rate
Which of the zones established by the ACR regarding MR safely, houses the actual
magnet? - 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 - 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. - false
Which magnet field involved in MRI imaging is a TVMF?
a. gradient magnet
b. RF magnet
c. main magnet
d. shim magnet - gradient magnet
The strength and direction of a magnetic field may be symbolized as:
a. a sine wave
b. a gyro-magnetic ratio
c. a vector
d. a set of coordinate axes - a vector
What is the function of shim coils?
a. they act a RF receivers
b. they produce magnetic field gradients
c. they maintain the magnetic field homogeneity
d. they transmit RF pulses - they maintain the magnetic field homogeneity
The sensitive volume size (sensitivity profile) extends to the _________ of the coil and
to the depth into the patient equal to _______ % of the diameter of the coil. - diameter,
75
The angle at which the NMV is moved by the RF pulse in relation to B0 is called the
__________? - Flip angle
Long term biological effects associated with the main magnetic field include:
a. there are no known long-term effects
b. magneto-phoshenes
c. peripheral nerve stimulation
d. magnet hemo-dynamic effects - there are no known long-term effects
Safety considerations associated with RF fields include:
,a. ferrous attraction
b. peripheral nerve stimulation
c. acoustic noise
d. heating of the tissue - heating of the tissue
The MR system component used for spatial localization is the:
a. main magnet
b. RF system
c. gradient magnets
d. shim magnet - gradient magnets
Gradient Systems, within the MR imager, includes three sets of gradients known as "Z",
"Y", "X" gradients. The "Z" gradient runs from _______, "Y" runs from _________ and
"X" runs from _________ within the imager and along the patient.
a. Superior to inferior / anterior to posterior / right to left
b. Right to left / front to back / superior to inferior
c. Front to back / superior to inferior / right to left
d. Superior to inferior / right to left / front to back - Superior to inferior / anterior to
posterior / right to left
What occurs after an oscillating nuclei is exposed to a frequency matching its Larmor
frequency?
a. resonance
b. decimation
c. nothing
d. gradation - resonance
Faraday's Law of Induction states that if a magnetic field is moved through/near a loop
of wire, it will create _______ in the wire.
a. resonance
b. a magnetic wave
c. an electrical current
d. torque - an electrical current
What are the three safety labels that devices or objects can be classified as? - MR safe,
MR conditional, and MR unsafe
The sum of the magnetic moments associated with the nuclei in the magnetic field is
known as:
a. B1
b. B0
c. the Net Magnetization
d. a spectrum of EM power - the Net magnetization
The Slight attraction to a magnet can be termed as: - paramagnetism
, Upon entering the MRI environment, a patient's hydrogen protons begin to:
a. oppose the main magnetic field
b. align with the main magnetic field
c. become randomly orientated to the main magnetic field
d. either align or oppose the main magnetic field - either align or oppose the main
magnetic field
Calculate the precessional frequency of H at 3T, using the Larmor equation where the
constant for H is 42.57. - between 127.6 and 127.7
List the four major components that comprise the MRI system. - Main magnet (B0), the
gradient magnet, the shim magnets and the RF magnet
T/F The Body coil can be used for transmitting and receiving RF signals in the MR
imaging process. - true
In order to obtain maximum voltage induction with the coil, the NMV should be
positioned near the ________ following the RF pulse.
a. biplane
b. diagonal plane
c. transverse plane
d. longitudinal plane - transverse plane
Match the following terms with their like term:
1. in-phase
2. Out-of-phase
3. Sign-up nuclei
4. spin-down nuclei
5. T2 decay
6. T1 recovery
WORD BANK: B1, Gradient, Parallel, spin-lattice relaxation, B0, coherent, anti-parallel,
net magnetic vector, incoherent, spin-spin relaxation - 1. coherent
2. incoherent
3. parallel
4. anti-parallel
5. spin-spin relaxation
6. spin-lattice relaxation
T1 weighted sequences are acquired using:
a. short TR and long TE
b. long TR and short TE
c. short TR and short TE
d. long TR and long TE - short TR and short TE
The repetition time in SE is defined as the:
ANSWERS 2025/2026 GRADED A+
More hydrogen protons are aligned parallel to the main magnetic field in the ________
energy state.
a. high
b. medium
c. average
d. low - 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. - 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 - 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
c. a wheelchair
d. an oxygen tank - 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 - 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 - receive signal
The gradient field can potentially stimulate a patient's _________.
a. dreams
b. skin temperature
c. peripheral nerves
d. eyesight - peripheral nerves
,SAR is an abbreviation for: - Specific Absorption Rate
Which of the zones established by the ACR regarding MR safely, houses the actual
magnet? - 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 - 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. - false
Which magnet field involved in MRI imaging is a TVMF?
a. gradient magnet
b. RF magnet
c. main magnet
d. shim magnet - gradient magnet
The strength and direction of a magnetic field may be symbolized as:
a. a sine wave
b. a gyro-magnetic ratio
c. a vector
d. a set of coordinate axes - a vector
What is the function of shim coils?
a. they act a RF receivers
b. they produce magnetic field gradients
c. they maintain the magnetic field homogeneity
d. they transmit RF pulses - they maintain the magnetic field homogeneity
The sensitive volume size (sensitivity profile) extends to the _________ of the coil and
to the depth into the patient equal to _______ % of the diameter of the coil. - diameter,
75
The angle at which the NMV is moved by the RF pulse in relation to B0 is called the
__________? - Flip angle
Long term biological effects associated with the main magnetic field include:
a. there are no known long-term effects
b. magneto-phoshenes
c. peripheral nerve stimulation
d. magnet hemo-dynamic effects - there are no known long-term effects
Safety considerations associated with RF fields include:
,a. ferrous attraction
b. peripheral nerve stimulation
c. acoustic noise
d. heating of the tissue - heating of the tissue
The MR system component used for spatial localization is the:
a. main magnet
b. RF system
c. gradient magnets
d. shim magnet - gradient magnets
Gradient Systems, within the MR imager, includes three sets of gradients known as "Z",
"Y", "X" gradients. The "Z" gradient runs from _______, "Y" runs from _________ and
"X" runs from _________ within the imager and along the patient.
a. Superior to inferior / anterior to posterior / right to left
b. Right to left / front to back / superior to inferior
c. Front to back / superior to inferior / right to left
d. Superior to inferior / right to left / front to back - Superior to inferior / anterior to
posterior / right to left
What occurs after an oscillating nuclei is exposed to a frequency matching its Larmor
frequency?
a. resonance
b. decimation
c. nothing
d. gradation - resonance
Faraday's Law of Induction states that if a magnetic field is moved through/near a loop
of wire, it will create _______ in the wire.
a. resonance
b. a magnetic wave
c. an electrical current
d. torque - an electrical current
What are the three safety labels that devices or objects can be classified as? - MR safe,
MR conditional, and MR unsafe
The sum of the magnetic moments associated with the nuclei in the magnetic field is
known as:
a. B1
b. B0
c. the Net Magnetization
d. a spectrum of EM power - the Net magnetization
The Slight attraction to a magnet can be termed as: - paramagnetism
, Upon entering the MRI environment, a patient's hydrogen protons begin to:
a. oppose the main magnetic field
b. align with the main magnetic field
c. become randomly orientated to the main magnetic field
d. either align or oppose the main magnetic field - either align or oppose the main
magnetic field
Calculate the precessional frequency of H at 3T, using the Larmor equation where the
constant for H is 42.57. - between 127.6 and 127.7
List the four major components that comprise the MRI system. - Main magnet (B0), the
gradient magnet, the shim magnets and the RF magnet
T/F The Body coil can be used for transmitting and receiving RF signals in the MR
imaging process. - true
In order to obtain maximum voltage induction with the coil, the NMV should be
positioned near the ________ following the RF pulse.
a. biplane
b. diagonal plane
c. transverse plane
d. longitudinal plane - transverse plane
Match the following terms with their like term:
1. in-phase
2. Out-of-phase
3. Sign-up nuclei
4. spin-down nuclei
5. T2 decay
6. T1 recovery
WORD BANK: B1, Gradient, Parallel, spin-lattice relaxation, B0, coherent, anti-parallel,
net magnetic vector, incoherent, spin-spin relaxation - 1. coherent
2. incoherent
3. parallel
4. anti-parallel
5. spin-spin relaxation
6. spin-lattice relaxation
T1 weighted sequences are acquired using:
a. short TR and long TE
b. long TR and short TE
c. short TR and short TE
d. long TR and long TE - short TR and short TE
The repetition time in SE is defined as the:
