Exam (elaborations)
ARMRIT Practice Questions and Answers 2024
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Exam of 7 pages for the course ARMRIT at ARMRIT (ARMRIT Practice)
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ARMRIT PracticeNuclear magnetic resonance. - answerMagnetic Resonance Imaging is derived from the
process known as:
Magnetic field, proton, radio-wave - answerOn a very basic level, the three basic
components required to attain MR signals are:
Superior soft-tissue contrast resolution. - answerIn comparison to Computed Axial
Tomography, an advantage of MRI is:
Special and costly site planning and shielding. - answerIn comparison to Computed
Axial Tomography, a disadvantage of MRI is:
Iron, cobalt, nickel. - answerMagnetism can be defined as the ability of certain
substances to attract:
Field or flux - answerTo symbolize the flow and area of a magnetic field, lines are used
which are called:
Dipoles. - answerMagnetic fields have direction which are usually designated as north
and south, therefore
magnetic fields are described as:
Vector. - answerMagnetic fields have strength and direction, which are represented by
a:
Faraday's Law - answerIn a loop of conductor in which an electric current is introduced
and maintained, a magnetic
field will be produced in the center perpendicular to the flow of electric current. This is
called:
Tesla. - answerThe strength of very large magnetic fields like those employed in MRI
systems, the SI unit
most commonly used is:
15,000 gauss - answerA 1.5 Tesla magnetic field is equal to:
0.06 Tesla to 3 Tesla - answerIn the USA, MRI systems in clinical use have main
magnetic field strengths that range
from:
, Homogeneity. - answerTo describe the uniformity of the MRI system's main magnetic
field, the term employed is:
B0 - answerIn the USA, the MRI system's main magnetic field and the vector that
represents it is
symbolized:
20-30 PPM. - answerThe main magnetic field of MRI systems in clinical use must meet
an acceptable
specification of:
H2O - answerAt any one time, human body tissue, in general, is made up of 50 - 90% of
what substance?
Odd number of total protons and neutrons. - answerIn MR imaging, for a chemical
substance to be affected by the main magnetic field and the
radio-wave it must contain an:
H - answerIn clinical MR imaging of the human body, the substance of interest is:
Magnetic moment - answerBecause of the spinning motion of the hydrogen proton it
has the same properties as a bar
magnet. The hydrogen proton's spinning motion gives it a:
Resonance frequency - answerIn MRI, substances respond to a specific radio
frequency which is known as:
Larmor equation - answerThe resonance frequency of any substance in a magnetic field
can be calculated by
employing the:
Gyro-magnetic ratio - answerAll chemical substances have an assigned constant known
as the:
wo = y x Bo - answerWhich of the following is the Larmor equation?
Wavelength and frequency - answerA sinewave is a symbol used to measure
electromagnetic energy. A sinewave's two components of measurement are:
permanent - answerWhich type of MRI magnet is made up of naturally ferromagnetic
material?
resistive - answerWhich type of MRI magnet requires a steady current of electricity in
coils of conductor wrapped around an air or iron core?
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