MRI Registry Review Questions with Verified Answers| Latest Update Graded A+
What is the unit for magnetic field strength? 1T=10(kG)=10,000 G
What type of artifact is seen exclusively in both phase and frequency directions? Aliasing
What artifact is the result of the recessional difference between fat and water? Chemical
shift
The area in which a gradient magnetic field is equal to the external magnetic field is called
Isocenter
The loss of phase coherence due to intrinsic and extrinsic magnetic field inhomogeneities is
called T2* decay
The internal carotid artery ascends to the __________ where it divides into the ___________
and ____________ cerebral arteries. Circle of Willis, anterior and middle
What are the three areas of the brain stem (superior to inferior)? Midbrain
(mesoencephalon) pons, and medulla oblongata
The ___________ arteries join at about the base of the pons to form the
___________________ artery. Vertebral, basilar
The _____________ artery ascends to the ______________, where it divides into the
_____________ cerebral arteries. basilar, Circle of Willis, posterior
CSF flows from the lateral ventricles to the third ventricle via the Foramen of Monroe
CSF flows from the third ventricle to the fourth ventricle via the Cerebral aqueduct
,Flow that is at different, but consistent, velocities across a vessel is known as Laminar flow
The time required by system hardware to transmit the RF excitation once an R-wave has been
detected is called Trigger delay
The use of flip angles less than 90 degrees results in a/an __________ in the component of
transverse magnetization. Decrease
The use of flip angles less than 90 degrees results in a/an _______________ in the SNR.
Decrease
An increase in voxel volume will have what effect on volume averaging? Increase
What are advantages and disadvantages of partial or fractional averaging? Decreased scan
time, as well as a decrease in SNR
An acquisition which acquires all data from one slice location before acquiring data from the
next slice is called Sequential imaging
An acquisition in which an entire imaging volume is exciting then spatially encoded is called
Three-dimensional (volume) imaging
The scan time for a volume acquisition is determined by which factors? (TR) x (Number of
Signal Averages) x (Number of Phase Encodings) x (Number of Slice Encodings)
Flow that is at different velocities and fluctuates randomly is known as Turbulent flow
The inner portion of the vertebral body is composed of Bone marrow
, The bright appearance of a normal nucleus palposus on T2-weighted images is due to High
water content
What are some normally enhancing structures of the spine? Muscle, bone marrow, epidural
fat, and scar tissue
The conus medullaris is seen around what vertebral level? T12-L1
What occupies the spinal canal below the L1 vertebral level? Cauda equina and CSF
Pulsatile motion from the ___________ vessels often obscure sagittal images of the knee.
Popliteal
What effect will increasing the matrix have on the SNR? Decrease
The pulse sequence that begins by inverting the net magnetization vector through 180 degrees
is called Inversion Recovery
Which angiographic technique is more sensitive to regions of slow flow such as the carotids,
peripheral, and venous circulation? Two-dimensional time of flight angiography (2DTOF)
Which pulse sequence is most commonly used in clinical imaging? Spin echo
What effect on the SNR will the use of small flip angles have? Decrease
In a gradient echo pulse sequence, what is used to dephase, the rephase the nuclei, and
generate an echo? The frequency encoding gradient
What is the unit for magnetic field strength? 1T=10(kG)=10,000 G
What type of artifact is seen exclusively in both phase and frequency directions? Aliasing
What artifact is the result of the recessional difference between fat and water? Chemical
shift
The area in which a gradient magnetic field is equal to the external magnetic field is called
Isocenter
The loss of phase coherence due to intrinsic and extrinsic magnetic field inhomogeneities is
called T2* decay
The internal carotid artery ascends to the __________ where it divides into the ___________
and ____________ cerebral arteries. Circle of Willis, anterior and middle
What are the three areas of the brain stem (superior to inferior)? Midbrain
(mesoencephalon) pons, and medulla oblongata
The ___________ arteries join at about the base of the pons to form the
___________________ artery. Vertebral, basilar
The _____________ artery ascends to the ______________, where it divides into the
_____________ cerebral arteries. basilar, Circle of Willis, posterior
CSF flows from the lateral ventricles to the third ventricle via the Foramen of Monroe
CSF flows from the third ventricle to the fourth ventricle via the Cerebral aqueduct
,Flow that is at different, but consistent, velocities across a vessel is known as Laminar flow
The time required by system hardware to transmit the RF excitation once an R-wave has been
detected is called Trigger delay
The use of flip angles less than 90 degrees results in a/an __________ in the component of
transverse magnetization. Decrease
The use of flip angles less than 90 degrees results in a/an _______________ in the SNR.
Decrease
An increase in voxel volume will have what effect on volume averaging? Increase
What are advantages and disadvantages of partial or fractional averaging? Decreased scan
time, as well as a decrease in SNR
An acquisition which acquires all data from one slice location before acquiring data from the
next slice is called Sequential imaging
An acquisition in which an entire imaging volume is exciting then spatially encoded is called
Three-dimensional (volume) imaging
The scan time for a volume acquisition is determined by which factors? (TR) x (Number of
Signal Averages) x (Number of Phase Encodings) x (Number of Slice Encodings)
Flow that is at different velocities and fluctuates randomly is known as Turbulent flow
The inner portion of the vertebral body is composed of Bone marrow
, The bright appearance of a normal nucleus palposus on T2-weighted images is due to High
water content
What are some normally enhancing structures of the spine? Muscle, bone marrow, epidural
fat, and scar tissue
The conus medullaris is seen around what vertebral level? T12-L1
What occupies the spinal canal below the L1 vertebral level? Cauda equina and CSF
Pulsatile motion from the ___________ vessels often obscure sagittal images of the knee.
Popliteal
What effect will increasing the matrix have on the SNR? Decrease
The pulse sequence that begins by inverting the net magnetization vector through 180 degrees
is called Inversion Recovery
Which angiographic technique is more sensitive to regions of slow flow such as the carotids,
peripheral, and venous circulation? Two-dimensional time of flight angiography (2DTOF)
Which pulse sequence is most commonly used in clinical imaging? Spin echo
What effect on the SNR will the use of small flip angles have? Decrease
In a gradient echo pulse sequence, what is used to dephase, the rephase the nuclei, and
generate an echo? The frequency encoding gradient
