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,In clinical MR imaging of the human body, the substance H. (hydrogen)
of interest is:
H.
NA23.
P31.
H²O.
The main magnetic field of the MRI system is described Oscillating and always perpendicular to Bo.
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.
The component Mxy is most associated with: Transverse to Bo;
T2 relaxation;
Anti-parallel to Bo; T1 relaxation; net magnetization. transverse magnetization.
Transverse to Bo; T2 relaxation; transverse magnetization.
Parallel to Bo; T1 relaxation; longitudinal magnetization.
Perpendicular to B1; T1 decay; FID.
The T2 process is also known as: Spin-Spin.
Spin-Spin.
Spin density.
Spin-Lattice.
Spin-warp.
Magnetic fields have strength and direction, which are Vector.
represented by a:
Field line.
Axis.
Vector.
Gauss line.
Once in the main magnetic field, a majority of hydrogen Parallel to Bo.
protons will align themselves:
Anti-parallel to Bo.
Orthogonal to Bo.
Parallel to Bo.
Randomly in Bo
, Because of the spinning motion of the hydrogen proton it Magnetic moment.
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.
The effects of main magnetic field inhomogeneities on 180 degrees.
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.
MRI terms and symbols which are oriented with and Equilibrium, parallel, longitudinal magnetization, Mz, Z axis.
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.
In a large main magnetic field such as those employed in A.Precession.
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.