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ARMRIT PRACTICES TESTS
EXAM STUDY GUIDE
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QUESTIONS COMPLETE
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WITH DETAILED VERIFIED
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ANSWERS 100% CORRECT
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, The 2 types of enhancement media described by Lauffer, the mechanism of T1 agents is - ANS
to decrease T1 relaxation time, thus emitting high signal
An analogy for the decoding of the MR signal through Fourier Transform - ANS Basilar
membrane processing sound
Logically each line of phase encoding data is combined to allow the FT to determine the position
along the y-axis. The number of phase encoding steps determines - ANS the number of
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pixels along the y-axis
In a gradient echo pulse sequence, which flip angle will produce a T2 weighted gradient echo
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image. - ANS >20 - <45 degree flip angle
In a horizontal magnet, what is the primary Gs (slice select gradient) for an axial slice - ANS
LO
Gz (axial slice)
A linear relationship between frequency and position is superimposed on Bo by the Gp (phase
encoding gradient). The Hydrogen protons relative precessional frequencies determine - ANS
phase shifts
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Combining a metal ion with a ligand reduces their tendency to bind to proteins, enzymes, or
membranes. The degree to which they dissociate is a measure of their - ANS toxicity
In a phase sequence employing 2DFT, the time can be calculated using which formula - ANS
TR x NEX x Matrix
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What pulse imaging technique is in all implementations of MRA - ANS gradient echo
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What year was the first MRI enhancement agent approved for clinical use - ANS 1988
Increasing NEX - ANS Increase SNR and Resolution
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Inversion time, in an IR pulse sequence, is the time interval between the - ANS 180 degree
and 90 degree pulses
Increasing the matrix - ANS increase resolution
A pulse sequence that replaces the second RF pulse with a gradient magnetic field to rephase
the transverse vector and produce and echo is called - ANS gradient echo
Increase FOV, TE, Slice thickness does - ANS not affect scan time
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