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ARMRIT PRACTICE TESTS QUESTIONS & ANSWERS
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ARMRIT PRACTICE TESTS QUESTIONS & ANSWERS
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ARMRIT PRACTICE TESTS QUESTIONS & ANSWERSThe 2 types of enhancement media described by Lauffer, the mechanism of T1 agents
is - Answers-to decrease T1 relaxation time, thus emitting high signal
An analogy for the decoding of the MR signal through Fourier Transform - Answers-
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 - Answers-
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. - Answers->20 - <45 degree flip angle
In a horizontal magnet, what is the primary Gs (slice select gradient) for an axial slice -
Answers-Gz (axial slice)
In spatial localization which factor most affects slice thickness and position - Answers-
bandwidth and strength of Gs (slice select gradient)
The two types of enhancement media described by Lauffer, the mechanism of T2
agents is - Answers-to decrease T2 relaxation time, thus emiting a high signal
A generation of phase differences along a particular direction of a slice - Answers-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 - Answers-Jean Baptiste - Joseph Fourier
A generation of frequency differences along a particular direction of a slice is called -
Answers-frequency encoding
In a horizontal field magnet what is the primary Gs (slice select gradient) for a sagittal
slice - Answers-Gx (sagittal slice)
Pixel size formula - Answers-FOV/Matrix
In an IR pulse sequence what will produce a STIR fat suppressed pulse sequence -
Answers-IR of 80 - 120ms
Decrease slice thickness - Answers-decreases SNR
, When selecting a volume of slices, which method for providing spatial encoding is
employed - Answers-3DFT
The purpose of the first use of metal ions in MRI enhancement like Gadolinium is to -
Answers-Decrease relaxation time for Hydrogen in the tissue
Which type of MRI magnet is made up of naturally ferromagnetic material - Answers-
superconductive magnet
Which type of receiver RF coil is placed close to the patients body for the purpose of
superficial anatomic structures - Answers-surface coils
The tissue characteristic that provides more tissue contrast and and pathology
information is - Answers-T2 effects
The longitudinal component of the NMV is designated as - Answers-Mz
During the relaxation process the MR signal grows weaker. The signal loss is known as
- Answers-FID free induction decay
Which type of electromagnetic coils are employed as transmitter, receiver, or both -
Answers-Radio frequency coil
An equation derived to predict the MR signal intensity of a particular tissue as the result
of a spin-echo pulse sequence is the - Answers-Bloch equation
A 1.5T magnetic field is equal to - Answers-15,000 Gauss
Magnetic Resonance Imaging is derived from the process known as - Answers-Nuclear
Magnetic Resonance
In the USA, MRI systems in clinical use have main magnetic field strengths that range
from - Answers-0.06T- 3T
In comparison to CAT an advantage of MRI is - Answers-superior soft tissue resolution
A linear relationship between frequency and position is superimposed on Bo by the Gp
(phase encoding gradient). The Hydrogen protons relative precessional frequencies
determine - Answers-phase 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 -
Answers-toxicity
In a phase sequence employing 2DFT, the time can be calculated using which formula -
Answers-TR x NEX x Matrix
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