ARRT MRI EXAM, FINAL EXAM, PRACTICE EXAM AND STUDY GUIDE
EXAM 2024-2025 600+ QUESTIONS And ANSWERS
which type of MRI magnet requires cryogens to cool magnetic coils to 4 degrees Kelvin? -
ANSWER--super conductive
currently there is no evidence of threat to fetal development from MRI exposure - ANSWER--
true
the T2 process is also known as... - ANSWER--spin-lattice
T2 is the measurement of time for the transverse component of the net magnetization vector
to decrease what percentage of its maximum value after the application of a 90 degree radio
frequency pulse - ANSWER--37%
MRI systems require rooms that provide specific shielding requirements. these rooms are lined
with what type of materials? - ANSWER--copper or galvanized steel
the specification that is acceptable for field inhomogeneity of an MRI magnet for clinical
scanning is... - ANSWER--B) 20-30ppm
In a superconducting magnet the material employed is .....blank which
becomes superconductive at 4 degrees Kelvin. - ANSWER--D) niobium- titanium
the tissue characteristic that provide more tissue contrast & pathological information is... -
ANSWER T2
,In 1990 Lauffer described two types of enhancement media, the mechanism of the T2 agent is
to... - ANSWER--B)decrease T2 relaxation time, thus emitting low signal
small magnetic fields that vary from strong to weaker predictably within the scan area of the
patient bore... - ANSWER--C) gradient magnetic field
the purpose of magnetic resonance angiography is to image the... - ANSWER--Blood flow
Using the followong protocol, determine the scan time for this pulse sequence (rounding to
nearest minute)
FOV 320mm/ TR 2000ms/ TE 20-80ms/ NEX 1/ Matrix 250×120 - ANSWER--4minutes.
TR× NEX ×Matrix
÷1000 (sec) and agian
÷60 (min)...
2000× 1 × 128= 256,000
÷1000=256
÷60=4.2min
The main magnetic field of the MRI System is described as constant and always oriented in one
set direction, either horizontal or vertical (depending on magnet type). The transmitted radio
frequency in comparison is described as - ANSWER--Oscillating and always perpendicular to B
sub zero
,The gradient magnetic fields are - ANSWER--A)Always on
Of the following statements, which describes part of the basic MR imaging process? - ANSWER--
Radio frequency signals interact with hydrogen protons
The basic process of MR signal generation contains two basic steps, they are... - ANSWER--
Simulation & relaxation
In MR imaging, for a chemical substance to be affected by the main magnetic field and the radio
wave, it must contain an... - ANSWER--Odd number of total protons and neurons
A pulse w sequence where only 90 degree RF pulses are used is called... - ANSWER--
D)Saturation recovery
blank is the property of most substances having paired orbital electrons resulting in
these substances being weakly repelled by the magnetic field. - ANSWER--D) diamagnetic
Which type of electro magnetic coils are designed to stimulate and detect an MR signal? -
ANSWER--Radio frequency coils
, The slice selection gradient exposes the body to a series of increasing or decreasing magnetic
fields to select a slice. In what relation to the slice is this gradient introduced? - ANSWER--D)
perpendicular
A pulse sequence that replaces the second RF pulse with a gradient magnetic field to rephase
the transverse vector and produce an echo is called - ANSWER--Gradient echo
In a pulse sequence, transmitting an initial 90 degree radio- frequency pulse will cause the net
magnetization vector to - ANSWER--Shift in both size and direction
The property of substances with large positive magnetic susceptibility that become magnetized
within a magnetic field and remain magnetized after being removed - ANSWER--D)
ferromagnetic
There are blank of blank serving the purpose of providing spatial information within the MR
signal - ANSWER--A) three pairs/gradient coils
The electromagnetic coil responsible for producing the strong magnetic field of a
superconducting magnet is embedded in a blank which serves as an insulator grin heat in
three event of a quench. - ANSWER--C) copper matrix
The transmit radio frequency coil generates a second electromagnetic field to the hydrogen
protons. This field is designated - ANSWER--B1
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