2025 MRI PHYSICS CORE EXAM QUESTIONS WITH
ANSWERS 2025/2026 GRADED A+
with regard to entry slice phenomena, an increase in velocity of flow will yield a ______
in entry slice phenomena - increase
you decrease NEX, you ____ scan time - decrease
the international electrotechnical comission (IEC) has defined the normal operating
mode for MRI scanner - pre-operating mode
_____ consist of multiple coils and receivers whose individual signals are combined to
create one - phased array coils
____ is the frequency difference between fat and water - chemical shift
presaturation pulses are often used to: - Reduce flow artifacts
SAR is expressed in ____ - w/kg
which factor is most important when monitoring SAR? - patient weight
which of the following is not a method to eliminate phase wrap? - decreasing NEX
A leak in the RF shielding can appear as a: - a "zipper" artifact in the frequency direction
localized swelling or stagnant blood flow that has seperated from the central streamlines
within a vein - vortex flow
truncation artifact is seen as: - high and low signal intensity bands
what is predictable distribution of flow velocities in layers that parallel the vessel wall
called: - laminar flow
which of the following magnets typically requires the highest on going cost for the power
supply? - resistive
______ is another term for mismapping - ghosting
which of the following magnets utilizes a cryogen bath? - superconducting
_____ is defined an area that is free access to the general public - zone 1
rephasing is performed in spin echo by ____ and gradient echo by _____ - RF pulse;
gradient
, whether a gradient field adds or subtracts from the main magnetic field depends on the
direction of the ____ - current
when the magnetic moments of hydrogen protons orientate with the main magnetic
field, that is termed - alignment
which of the following has the longst wavelength - RF wave
what artifact occurs when a collagen structure is at an angle of 55 degrees to the main
field: - magic angle
what does FID stand for - free induction decay
which of the following is not an extrinsic parameter? - Flow
which of the following will NOT increase SNR? - small FOV
whenever the NMV is kept under 90 degrees, it is said to be partially saturated - false
saturation is typically achieved with a _____ - short TR
which of the following is the most common T1 contrast agent? - gadolinium
steep gradient slopes alter the magnetic field strength between two points more than
shallow gradient - true
to achieve a low matrix, the phase encoding gradient is applied fewer times during the
pulse sequence - true
sampling less than once per cycle represents a completely incorrect frequency that
leads to artifacts - true
the central portion of k space data has a ____ signal amplitude and ____ spatial
resolution - high
low
to achieve a small FOV in the frequency direction, a shallow frequency encoding
gradient is applied. - true
the phase encoding gradient is often called the "read out" or "measurement gradient" –
false
all the following are artifacts in MRI except - beam hardening
_____ is defined as the strength of the gradient over distance - slew rate
.5T is equal to _____ Gauss. - 5,000
ANSWERS 2025/2026 GRADED A+
with regard to entry slice phenomena, an increase in velocity of flow will yield a ______
in entry slice phenomena - increase
you decrease NEX, you ____ scan time - decrease
the international electrotechnical comission (IEC) has defined the normal operating
mode for MRI scanner - pre-operating mode
_____ consist of multiple coils and receivers whose individual signals are combined to
create one - phased array coils
____ is the frequency difference between fat and water - chemical shift
presaturation pulses are often used to: - Reduce flow artifacts
SAR is expressed in ____ - w/kg
which factor is most important when monitoring SAR? - patient weight
which of the following is not a method to eliminate phase wrap? - decreasing NEX
A leak in the RF shielding can appear as a: - a "zipper" artifact in the frequency direction
localized swelling or stagnant blood flow that has seperated from the central streamlines
within a vein - vortex flow
truncation artifact is seen as: - high and low signal intensity bands
what is predictable distribution of flow velocities in layers that parallel the vessel wall
called: - laminar flow
which of the following magnets typically requires the highest on going cost for the power
supply? - resistive
______ is another term for mismapping - ghosting
which of the following magnets utilizes a cryogen bath? - superconducting
_____ is defined an area that is free access to the general public - zone 1
rephasing is performed in spin echo by ____ and gradient echo by _____ - RF pulse;
gradient
, whether a gradient field adds or subtracts from the main magnetic field depends on the
direction of the ____ - current
when the magnetic moments of hydrogen protons orientate with the main magnetic
field, that is termed - alignment
which of the following has the longst wavelength - RF wave
what artifact occurs when a collagen structure is at an angle of 55 degrees to the main
field: - magic angle
what does FID stand for - free induction decay
which of the following is not an extrinsic parameter? - Flow
which of the following will NOT increase SNR? - small FOV
whenever the NMV is kept under 90 degrees, it is said to be partially saturated - false
saturation is typically achieved with a _____ - short TR
which of the following is the most common T1 contrast agent? - gadolinium
steep gradient slopes alter the magnetic field strength between two points more than
shallow gradient - true
to achieve a low matrix, the phase encoding gradient is applied fewer times during the
pulse sequence - true
sampling less than once per cycle represents a completely incorrect frequency that
leads to artifacts - true
the central portion of k space data has a ____ signal amplitude and ____ spatial
resolution - high
low
to achieve a small FOV in the frequency direction, a shallow frequency encoding
gradient is applied. - true
the phase encoding gradient is often called the "read out" or "measurement gradient" –
false
all the following are artifacts in MRI except - beam hardening
_____ is defined as the strength of the gradient over distance - slew rate
.5T is equal to _____ Gauss. - 5,000
