Exam (elaborations)
ARMRIT-PRACTICE TEST
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ARMRIT-PRACTICE TEST
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ARMRIT-PRACTICE TESTThe T1 process is also known as: - Answers-Spin Lattice
Which type of electromagnetic coils produce smaller magnetic field which allow spatial
localization to be performed? - Answers-Gradient coils
The component Mxy is most associated with: - Answers-Transverse to Bo; T2
relaxation; Transverse magnetization
The resonance frequency of any substance in a magnetic field can be calculated by
employing the: - Answers-Larmor equation
Once the patient's area of interest is placed in the main magnetic field of the MRI
system, the hydrogen protons will: - Answers-Precess parallel to Bo
The longitudinal component of the NMV is designated: - Answers-Mz
T1 is the measurement of time for the longitudinal component of the net magnetization
vector to recover what percentage of its original value after the application of a 90
degree radio-frequency pulse? - Answers-63%
At any one time, human body tissue, in general, is made up of 50-90% of what
substance? - Answers-H2O
In a loop of conductor in which an electric current is introduced and maintained, a
magnetic field will be produced in the center perpendicular to the flow of electric current
this is called: - Answers-Faraday's Law
On a very basic level , the three basic components required to attain MR signals are: -
Answers-Magnetic field, Proton, Radio-wave
Which type of electromagnetic coils correct inhomogeneities in the main magnetic field?
- Answers-Shim coils
The tissue characteristic that is dependent on the strength of the main magnetic field
and temperature is: - Answers-T1 effects
The components of the Gyro-magnetic ratio are: - Answers-Magnetic moment to angular
momentum
The mechanism of T1 contrast enhancement agents is to: - Answers-Decrease T1
relaxation time, therefore producing high signal
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