MRI ARMRIT Exam Questions Version 1||Verified Exam
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Which type of electromagnetic coils are employed as a
transmitter, receiver or both? - Answer-Radio-frequency
coils
The process of relaxation begins when: - Answer-B1 is
turned off
To symbolize the flow and area of a magnetic field, lines
are used which are called: - Answer-Field or flux
Which molecule precesses closer to the Larmor
frequency? - Answer-Fat
Which cryogenic material can produce temperature as low
as 4 degrees Kelvin? - Answer-Liquid helium
Magnetism can be defined as the ability of certain
substances to attract: - Answer-Iron
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Cobalt
Nickel
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: -
Answer-Precession
In comparison to Computed Axial Tomography, a
disadvantage of MRI is: - Answer-Special and costly site
planning & shielding
The tissue characteristic which depends more on the state
(solid, liquid, gas) of a tissue than any other factor is: -
Answer-T2 effects
The T1 process is also known as: - Answer-Spin-Lattice
To describe the uniformity of the MRI system's main
magnetic field, the term employed is: - Answer-
Homogeneity
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The main magnetic field of MRI systems in clinical use
must meet an acceptable specification of: - Answer-20-30
PPM
PPM: parts-per-million
A 90 degree radio-frequency pulse will alter the net
magnetization vector. Another effect is: - Answer-The
hydrogen protons will have phase coherence
Which type of electromagnetic coils produce smaller
magnetic fields which allow spatial localization to be
performed? - Answer-Gradient coils
The T2 process is also known as: - Answer-Spin-Spin
The tissue characteristic that provides more tissue
contrast and pathological information is: - Answer-T2
effects
The basic process of MR signal generation contains two
basic steps, they are: - Answer-Stimulation & Relaxation