ARMRIT study guide questions with verified detailed solutions || || || || || || ||
At any one time, human body tissue, in general, is made up of 50 - 90% of what substance?
|| || || || || || || || || || || || || || || || || ||
a. C13
||
b. NA 23
|| ||
c. H²O
||
d. H
||
H²O
Tissues that are very efficient at spin-lattice interactions near the Larmor frequency, such as
|| || || || || || || || || || || || || ||
fatty tissues, should have:
|| || ||
Low T1 values and produces hyperintense signals.
|| || || || || ||
High T1 values and produce hyperintense signals.
|| || || || || ||
High T1 values and produce hypointense signals.
|| || || || || ||
Low T1 values and produce hypointense signals.
|| || || || || ||
Low T1 values and produces hyperintense signals.
|| || || || || ||
The Larmor frequency of hydrogen protons in a 1.5 Tesla magnetic field is:
|| || || || || || || || || || || ||
6.4 MHz/Tesla.
||
MHz/Tesla.
25.5 MHz/Tesla. ||
63.9 MHz/Tesla. ||
63.9 MHz/Tesla. ||
In clinical MR imaging of the human body, the substance of interest is:
|| || || || || || || || || || || ||
H.
NA23.
P31.
,H²O.
H. (hydrogen)
||
The main magnetic field of the MRI system is described as constant and always oriented in
|| || || || || || || || || || || || || || || ||
one set direction, either horizontal or vertical (dependent on type of magnet). The
|| || || || || || || || || || || || ||
transmitted radio-frequency, in comparison, is described as:
|| || || || || ||
Constant and always parallel to Bo.
|| || || || ||
Oscillating and always parallel to Bo. || || || || ||
Constant and always perpendicular to Bo.
|| || || || ||
Oscillating and always perpendicular to Bo. || || || || ||
Oscillating and always perpendicular to Bo. || || || || ||
The component Mxy is most associated with:
|| || || || || ||
Anti-parallel to Bo; T1 relaxation; net magnetization. || || || || || ||
Transverse to Bo; T2 relaxation; transverse magnetization.
|| || || || || ||
Parallel to Bo; T1 relaxation; longitudinal magnetization.
|| || || || || ||
Perpendicular to B1; T1 decay; FID. || || || || ||
Transverse to Bo; || ||
T2 relaxation;
||
transverse magnetization. ||
The T2 process is also known as:
|| || || || || ||
Spin-Spin.
Spin density. ||
Spin-Lattice.
Spin-warp.
Spin-Spin.
Magnetic fields have strength and direction, which are represented by a:
|| || || || || || || || || ||
Field line. ||
Axis.
,Vector.
Gauss line. ||
Vector.
Once in the main magnetic field, a majority of hydrogen protons will align themselves:
|| || || || || || || || || || || || ||
Anti-parallel to Bo. || ||
Orthogonal to Bo. || ||
Parallel to Bo. || ||
Randomly in Bo || ||
Parallel to Bo. || ||
Because of the spinning motion of the hydrogen proton it has the same properties as a bar
|| || || || || || || || || || || || || || || || ||
magnet. The hydrogen proton's spinning motion gives it a:
|| || || || || || || ||
Magnetic charge. ||
Magnetic spin. ||
Magnetic moment. ||
Magnetic precession. ||
Magnetic moment. ||
The effects of main magnetic field inhomogeneities on the FID signal are corrected for in a
|| || || || || || || || || || || || || || || ||
Spin-echo sequence by applying a second radio-frequency pulse. The flip angle of this radio-
|| || || || || || || || || || || || ||
frequency pulse is: || ||
45 degrees.
||
60 degrees.
||
90 degrees.
||
180 degrees.
||
180 degrees.
||
MRI terms and symbols which are oriented with and superimposed on the symbol of Bo
|| || || || || || || || || || || || || || ||
are:
-Transverse magnetization, Mxy, X axis, Y axis. || || || || || ||
, -Net magnetization, antiparallel, high energy level.
|| || || || ||
-Equilibrium, parallel, longitudinal magnetization, Mz, Z axis.
|| || || || || ||
Equilibrium, parallel, longitudinal magnetization, Mz, Z axis.
|| || || || || ||
In a large main magnetic field such as those employed in MRI, the motion of a hydrogen
|| || || || || || || || || || || || || || || || ||
proton has been described as wobbling like a spinning top. This motion is called:
|| || || || || || || || || || || || ||
A.Precession.
B.Resonance.
C.Frequency.
D.Angular momentum. ||
A.Precession.
Methemoglobin and gadolinium based contrast agents have magnetic properties that
|| || || || || || || || || ||
shorten both T1 and T2 values in adjacent tissues. What type of substances are they?
|| || || || || || || || || || || || || ||
Diamagnetic.
Paramagnetic.
Superparamagnetic.
Ferromagnetic.
Paramagnetic.
The T1 process is also known as:
|| || || || || ||
Spin-Spin.
Spin density.||
Spin-Lattice.
Spin-warp.
Spin-Lattice.
The basic process of MR signal generation contains two basic steps, they are:
|| || || || || || || || || || || ||
Parallel alignment and anti-parallel alignment.
|| || || ||
Stimulation and relaxation. || ||
At any one time, human body tissue, in general, is made up of 50 - 90% of what substance?
|| || || || || || || || || || || || || || || || || ||
a. C13
||
b. NA 23
|| ||
c. H²O
||
d. H
||
H²O
Tissues that are very efficient at spin-lattice interactions near the Larmor frequency, such as
|| || || || || || || || || || || || || ||
fatty tissues, should have:
|| || ||
Low T1 values and produces hyperintense signals.
|| || || || || ||
High T1 values and produce hyperintense signals.
|| || || || || ||
High T1 values and produce hypointense signals.
|| || || || || ||
Low T1 values and produce hypointense signals.
|| || || || || ||
Low T1 values and produces hyperintense signals.
|| || || || || ||
The Larmor frequency of hydrogen protons in a 1.5 Tesla magnetic field is:
|| || || || || || || || || || || ||
6.4 MHz/Tesla.
||
MHz/Tesla.
25.5 MHz/Tesla. ||
63.9 MHz/Tesla. ||
63.9 MHz/Tesla. ||
In clinical MR imaging of the human body, the substance of interest is:
|| || || || || || || || || || || ||
H.
NA23.
P31.
,H²O.
H. (hydrogen)
||
The main magnetic field of the MRI system is described as constant and always oriented in
|| || || || || || || || || || || || || || || ||
one set direction, either horizontal or vertical (dependent on type of magnet). The
|| || || || || || || || || || || || ||
transmitted radio-frequency, in comparison, is described as:
|| || || || || ||
Constant and always parallel to Bo.
|| || || || ||
Oscillating and always parallel to Bo. || || || || ||
Constant and always perpendicular to Bo.
|| || || || ||
Oscillating and always perpendicular to Bo. || || || || ||
Oscillating and always perpendicular to Bo. || || || || ||
The component Mxy is most associated with:
|| || || || || ||
Anti-parallel to Bo; T1 relaxation; net magnetization. || || || || || ||
Transverse to Bo; T2 relaxation; transverse magnetization.
|| || || || || ||
Parallel to Bo; T1 relaxation; longitudinal magnetization.
|| || || || || ||
Perpendicular to B1; T1 decay; FID. || || || || ||
Transverse to Bo; || ||
T2 relaxation;
||
transverse magnetization. ||
The T2 process is also known as:
|| || || || || ||
Spin-Spin.
Spin density. ||
Spin-Lattice.
Spin-warp.
Spin-Spin.
Magnetic fields have strength and direction, which are represented by a:
|| || || || || || || || || ||
Field line. ||
Axis.
,Vector.
Gauss line. ||
Vector.
Once in the main magnetic field, a majority of hydrogen protons will align themselves:
|| || || || || || || || || || || || ||
Anti-parallel to Bo. || ||
Orthogonal to Bo. || ||
Parallel to Bo. || ||
Randomly in Bo || ||
Parallel to Bo. || ||
Because of the spinning motion of the hydrogen proton it has the same properties as a bar
|| || || || || || || || || || || || || || || || ||
magnet. The hydrogen proton's spinning motion gives it a:
|| || || || || || || ||
Magnetic charge. ||
Magnetic spin. ||
Magnetic moment. ||
Magnetic precession. ||
Magnetic moment. ||
The effects of main magnetic field inhomogeneities on the FID signal are corrected for in a
|| || || || || || || || || || || || || || || ||
Spin-echo sequence by applying a second radio-frequency pulse. The flip angle of this radio-
|| || || || || || || || || || || || ||
frequency pulse is: || ||
45 degrees.
||
60 degrees.
||
90 degrees.
||
180 degrees.
||
180 degrees.
||
MRI terms and symbols which are oriented with and superimposed on the symbol of Bo
|| || || || || || || || || || || || || || ||
are:
-Transverse magnetization, Mxy, X axis, Y axis. || || || || || ||
, -Net magnetization, antiparallel, high energy level.
|| || || || ||
-Equilibrium, parallel, longitudinal magnetization, Mz, Z axis.
|| || || || || ||
Equilibrium, parallel, longitudinal magnetization, Mz, Z axis.
|| || || || || ||
In a large main magnetic field such as those employed in MRI, the motion of a hydrogen
|| || || || || || || || || || || || || || || || ||
proton has been described as wobbling like a spinning top. This motion is called:
|| || || || || || || || || || || || ||
A.Precession.
B.Resonance.
C.Frequency.
D.Angular momentum. ||
A.Precession.
Methemoglobin and gadolinium based contrast agents have magnetic properties that
|| || || || || || || || || ||
shorten both T1 and T2 values in adjacent tissues. What type of substances are they?
|| || || || || || || || || || || || || ||
Diamagnetic.
Paramagnetic.
Superparamagnetic.
Ferromagnetic.
Paramagnetic.
The T1 process is also known as:
|| || || || || ||
Spin-Spin.
Spin density.||
Spin-Lattice.
Spin-warp.
Spin-Lattice.
The basic process of MR signal generation contains two basic steps, they are:
|| || || || || || || || || || || ||
Parallel alignment and anti-parallel alignment.
|| || || ||
Stimulation and relaxation. || ||
