ARMRIT practice tests questions and
answers
The 2 types of enhancement media described by Lauffer, the mechanism of T1
agents is - to decrease T1 relaxation time, thus emitting high signal
An analogy for the decoding of the MR signal through Fourier Transform - 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 - the number of pixels along the y-axis
In a gradient echo pulse sequence, which flip angle will produce a T2 weighted
gradient echo image. - >20 - <45 degree flip angle
In a horizontal magnet, what is the primary Gs (slice select gradient) for an axial
slice - 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 - phase shifts
,ARMRIT practice tests questions and
answers
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 - toxicity
In a phase sequence employing 2DFT, the time can be calculated using which
formula - TR x NEX x Matrix
What pulse imaging technique is in all implementations of MRA - gradient echo
What year was the first MRI enhancement agent approved for clinical use - 1988
Increasing NEX - Increase SNR and Resolution
Inversion time, in an IR pulse sequence, is the time interval between the - 180
degree and 90 degree pulses
Increasing the matrix - increase resolution
, ARMRIT practice tests questions and
answers
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 - gradient echo
Increase FOV, TE, Slice thickness does - not affect scan time
In spatial localization which factor most affects slice thickness and position -
bandwidth and strength of Gs (slice select gradient)
The two types of enhancement media described by Lauffer, the mechanism of T2
agents is - to decrease T2 relaxation time, thus emiting a high signal
A generation of phase differences along a particular direction of a slice - phase
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 - Jean Baptiste - Joseph Fourier
A generation of frequency differences along a particular direction of a slice is
called - frequency encoding
answers
The 2 types of enhancement media described by Lauffer, the mechanism of T1
agents is - to decrease T1 relaxation time, thus emitting high signal
An analogy for the decoding of the MR signal through Fourier Transform - 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 - the number of pixels along the y-axis
In a gradient echo pulse sequence, which flip angle will produce a T2 weighted
gradient echo image. - >20 - <45 degree flip angle
In a horizontal magnet, what is the primary Gs (slice select gradient) for an axial
slice - 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 - phase shifts
,ARMRIT practice tests questions and
answers
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 - toxicity
In a phase sequence employing 2DFT, the time can be calculated using which
formula - TR x NEX x Matrix
What pulse imaging technique is in all implementations of MRA - gradient echo
What year was the first MRI enhancement agent approved for clinical use - 1988
Increasing NEX - Increase SNR and Resolution
Inversion time, in an IR pulse sequence, is the time interval between the - 180
degree and 90 degree pulses
Increasing the matrix - increase resolution
, ARMRIT practice tests questions and
answers
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 - gradient echo
Increase FOV, TE, Slice thickness does - not affect scan time
In spatial localization which factor most affects slice thickness and position -
bandwidth and strength of Gs (slice select gradient)
The two types of enhancement media described by Lauffer, the mechanism of T2
agents is - to decrease T2 relaxation time, thus emiting a high signal
A generation of phase differences along a particular direction of a slice - phase
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 - Jean Baptiste - Joseph Fourier
A generation of frequency differences along a particular direction of a slice is
called - frequency encoding
