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ARMRIT practice testsThe 2 types of enhancement media described by Lauffer, the mechanism of T1 agents
is - answerto decrease T1 relaxation time, thus emitting high signal
An analogy for the decoding of the MR signal through Fourier Transform -
answerBasilar 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 - answerthe
number of pixels along the y-axis
In a gradient echo pulse sequence, which flip angle will produce a T2 weighted gradient
echo image. - answer>20 - <45 degree flip angle
In a horizontal magnet, what is the primary Gs (slice select gradient) for an axial slice -
answerGz (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 - answerphase shifts
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 -
answertoxicity
In a phase sequence employing 2DFT, the time can be calculated using which formula -
answerTR x NEX x Matrix
What pulse imaging technique is in all implementations of MRA - answergradient echo
What year was the first MRI enhancement agent approved for clinical use - answer1988
Increasing NEX - answerIncrease SNR and Resolution
Inversion time, in an IR pulse sequence, is the time interval between the - answer180
degree and 90 degree pulses
Increasing the matrix - answerincrease 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 - answergradient echo
, Increase FOV, TE, Slice thickness does - answernot affect scan time
In spatial localization which factor most affects slice thickness and position -
answerbandwidth and strength of Gs (slice select gradient)
The two types of enhancement media described by Lauffer, the mechanism of T2
agents is - answerto decrease T2 relaxation time, thus emiting a high signal
A generation of phase differences along a particular direction of a slice - answerphase
encoding
Who described the mathematical method of converting a time-varying signal into its
frequency components which are used to obtain positional information from the MR
signal - answerJean Baptiste - Joseph Fourier
A generation of frequency differences along a particular direction of a slice is called -
answerfrequency encoding
In a horizontal field magnet what is the primary Gs (slice select gradient) for a sagittal
slice - answerGx (sagittal slice)
Pixel size formula - answerFOV/Matrix
In an IR pulse sequence what will produce a STIR fat suppressed pulse sequence -
answerIR of 80 - 120ms
Decrease slice thickness - answerdecreases SNR
When selecting a volume of slices, which method for providing spatial encoding is
employed - answer3DFT
The purpose of the first use of metal ions in MRI enhancement like Gadolinium is to -
answerDecrease relaxation time for Hydrogen in the tissue
Which type of MRI magnet is made up of naturally ferromagnetic material -
answersuperconductive magnet
Which type of receiver RF coil is placed close to the patients body for the purpose of
superficial anatomic structures - answersurface coils
The tissue characteristic that provides more tissue contrast and and pathology
information is - answerT2 effects
The longitudinal component of the NMV is designated as - answerMz
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