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ARMRIT EXAM QUESTIONS AND ANSWERS
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ARMRIT EXAM QUESTIONS AND ANSWERS
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ARMRIT EXAM QUESTIONS AND ANSWERSElectromagnetic energy is symbolized by a sine wave that has two components of
measurements, they are: - Answers-Wavelength and frequency
Of the following techniques which one is applied to prevent "crosstalk" between multi-
slices with little or no interslice "gap" - Answers-Interleaving
The artifact known as aliasing, wrap around or fold over will always show up in what
gradient direction? - Answers-Phase encoding
Which of the following causes of artifacts on MR images is most commonly mistaken for
a pathological signal? - Answers-Chemical shift
Substances which have magnetic properties of their own, such as, methemoglobin or
gadolinium causes shortened T1 and T2 values for tissues in their vicinity are: -
Answers-Paramagnetic
The temperature of the liquid helium in which the electromagnetic coil is immersed is
approx: - Answers--436 degrees F
RF pulses are identified according to the _________ - Answers-Flip angle
MRI magnets that require cryogens to cool a substance to approximately 4 degrees
Kelvin are: - Answers-Superconducting
___ is the uniformity of the static magnetic field, expressed in terms of PPM (Parts per
million) over a defined volume. - Answers-Homogeniety
In contrast to B0, B sub zero the Bsub one RF field is - Answers-Rapidly rotating and
always perpendicular to B sub zero
The tissue property, in MRI, that is closely related to tissue state (solid, liquid) than any
other tissue feature is: - Answers-T1 effects
Maximum exposure to gradient magnetic fields are set at a rate of: - Answers-
6T/second
The gradient that is turned on to sample the echo signal is: - Answers-Phase encoding
There are _ of __ serving the purpose of providing spatial information within the MR
signal. - Answers-Three pairs/gradient coils
, In general, parameter settings of TR and TE for attaining T1 and T2 images are as
follows: - Answers-T1: TR 100-1000 ms, TE 20-30 ms and T2: TR 1600-3000ms, TE 70-
100 ms
A resistive magnet requires liquid helium and liquid nitrogen in a dedicated cooling
system - Answers-False
Following a 90 degree RF pulse, the signal that is created is called _____ - Answers-
free induction decay
Passing from one compartment to another is the process of passing through the
abnormal blood-brain-barrier. The compartments involved are the: - Answers-
Intravascular to interstitial
The mathematical operation that converts a time varying RF signal to a graph that
shows amplitude as a function of frequency and contains information about signal
strength as a function of position is: - Answers-2 dimensional Fourier Transform
Which of the following settings descriptions for the parameters TR and TE best
describes a proton density image? - Answers-Long TR/short TE
___________ is the property of most substances having paired orbital electrons
resulting in these substances being weakly repelled by the applied magnetic field. -
Answers-Diamagnetic
Relaxation from resonance begins at the time: - Answers-B1 is turned off
Of the following tissues, which has the longest T2 value? - Answers-Cerebrospinal fluid
(1600)
Currently, there is no evidence of a threat to fetal development from MRI exposure. -
Answers-True
The formula that describes the relationship between the static magnetic field and the
precessional frequency of the hydrogen protons is the _____ - Answers-Larmor
equation
Employing an inversion recovery pulse sequence with a water suppression technique a
normal intervertebral disc will appear dark - Answers-True
Of the following anatomical structure which is considered to be normally enhancing post
gad injection? - Answers-Choroids plexus
Aliasing occurs due to tissue outside of the selected field of view (FOV) being : -
Answers-Undersampled
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