2025 MRI PHYSICS EXAM QUESTIONS WITH ANSWERS
2025/2026 GRADED A+
which of the following is NOT a potential biological effect that could occur in a static
magnetic field above 2.0 - increased touch sensitivity
t1 and t2 relaxation depend on 3 factors, which of the following is NOT one of these
factors? - how well the backscatter is kept to a minimum
t2* decay is faster than t2 due to: - inhomogenities
the nyquist theorem will remedy which of the following artifacts - aliasing
the mathmatical process to produce an image from the acquired data stored in k-space
is called - FFT
the phase difference between flow and stationary nuclei in a voxel results in a loss of
signal amplitude. - intra-voxel dehasing
the precessional frequency difference between water and fat at 1.5t is ____ Hz - 220
the purpose of the 180 degree RF pulse in a inversion recovery pulse sequence is to: -
move the NMV into full staturation
the stray magnetic field outside the bore of the magnet is known as: - fringe field
the use of a small coil instead of a large coil would _____ SNR - increase
to achieve a PD weighted image, the following events need to occur: - long TR and a
short TE
to achieve thick slices, I would utilize a _____ slope and a _____ bandwidth - shallow,
broad
transverse relaxation is when the magnetization has decayed down to______ - 37%
typically, ______ weighted images are useful to demonstrate anatomy, while ______
weighted images - t1, t2
uniformity of the magnetic field across the object being imaged is referred to as: -
homogenity
when compared to water, the NMV of fat dephases ______ and has a ______ - faster
shorter
, when creating an MRI body image slice in the coronal plane, which gradient would you
use to phase - x
which of the following MRI system magnets requires a special internal cooling system? -
super conducting
which of the following is NOT a method to reduce the magnetic susceptibility artifact? -
utilize intravenous contrast media
which of the following is NOT an extrinsic contrast parameter - proton density
which of the following is not a type of MRI system magnet - high coil
which of the following is not an advantage of gradient sequences? - doesn't compensate
for inhomogenities
which of the following is required of the element found in the body in order to be suitable
for generation - it must have an odd number of protons
which of the following is the most accurate definition for the nyquist thereom? - the
highest frequency must be sampled at least 2x per cycle to accurately digitize or
represent it
which of the following term is defined as a "small change in the magnetic field along a
particular axis"? - gradient
which of the following types of MRI system magnets requires no special internal cooling
system? - resistive
which of the following variables is not part of the larmor equation - angle of precession
while non-ferrous metallic implants may show little or no deflection to the field, they
could cause ____ - significant heating due to their inability to dissipate the heat caused
by radio frequency absorption
with regards to TOF phenomena, an increase in slice thickness will yield: - signal loss
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
2025/2026 GRADED A+
which of the following is NOT a potential biological effect that could occur in a static
magnetic field above 2.0 - increased touch sensitivity
t1 and t2 relaxation depend on 3 factors, which of the following is NOT one of these
factors? - how well the backscatter is kept to a minimum
t2* decay is faster than t2 due to: - inhomogenities
the nyquist theorem will remedy which of the following artifacts - aliasing
the mathmatical process to produce an image from the acquired data stored in k-space
is called - FFT
the phase difference between flow and stationary nuclei in a voxel results in a loss of
signal amplitude. - intra-voxel dehasing
the precessional frequency difference between water and fat at 1.5t is ____ Hz - 220
the purpose of the 180 degree RF pulse in a inversion recovery pulse sequence is to: -
move the NMV into full staturation
the stray magnetic field outside the bore of the magnet is known as: - fringe field
the use of a small coil instead of a large coil would _____ SNR - increase
to achieve a PD weighted image, the following events need to occur: - long TR and a
short TE
to achieve thick slices, I would utilize a _____ slope and a _____ bandwidth - shallow,
broad
transverse relaxation is when the magnetization has decayed down to______ - 37%
typically, ______ weighted images are useful to demonstrate anatomy, while ______
weighted images - t1, t2
uniformity of the magnetic field across the object being imaged is referred to as: -
homogenity
when compared to water, the NMV of fat dephases ______ and has a ______ - faster
shorter
, when creating an MRI body image slice in the coronal plane, which gradient would you
use to phase - x
which of the following MRI system magnets requires a special internal cooling system? -
super conducting
which of the following is NOT a method to reduce the magnetic susceptibility artifact? -
utilize intravenous contrast media
which of the following is NOT an extrinsic contrast parameter - proton density
which of the following is not a type of MRI system magnet - high coil
which of the following is not an advantage of gradient sequences? - doesn't compensate
for inhomogenities
which of the following is required of the element found in the body in order to be suitable
for generation - it must have an odd number of protons
which of the following is the most accurate definition for the nyquist thereom? - the
highest frequency must be sampled at least 2x per cycle to accurately digitize or
represent it
which of the following term is defined as a "small change in the magnetic field along a
particular axis"? - gradient
which of the following types of MRI system magnets requires no special internal cooling
system? - resistive
which of the following variables is not part of the larmor equation - angle of precession
while non-ferrous metallic implants may show little or no deflection to the field, they
could cause ____ - significant heating due to their inability to dissipate the heat caused
by radio frequency absorption
with regards to TOF phenomena, an increase in slice thickness will yield: - signal loss
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
