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armrit study guide questions and answersrated A
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.
,armrit study guide questions and answers
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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.
,armrit study guide questions and answers
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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.
, armrit study guide questions and answers
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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.
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