Magnetic Resonance Imaging (MRI) Exam Questions with 100% Correct Answers
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Course
Magnetic Resonance Imaging
Institution
Magnetic Resonance Imaging
True or false,
Quenching is dangerous and prohibitively expensive Correct Answer True
How is Data localization in MRI accomplished Correct Answer a gradient magnetic field is superimposed on a static external magnetic field.
What is the primary variable in the data collection procedure duri...
Magnetic Resonance Imaging (MRI) Exam
Questions with 100% Correct Answers
True or false,
Quenching is dangerous and prohibitively expensive Correct Answer True
How is Data localization in MRI accomplished Correct Answer a gradient magnetic field
is superimposed on a static external magnetic field.
What is the primary variable in the data collection procedure during MRI Correct Answer
the sequence
True or false,
Two electromagnetic coils are required to produce magnetic field gradients
corresponding to the axis to be imaged Correct Answer False
Determines the section thickness, resolution and plane of the image in MRI Correct
Answer Gradients coils
Repetition time (TR) Correct Answer the interval between pulse sequences
The frequency of a given type element is called the Correct Answer Larmor Frequency
The longer the wave is applied to the patient, Correct Answer the greater the angle of
precession
The higher the proton density Correct Answer the higher the MRI signal
True or false,
A 380 degree pulse is most effective in MRI Correct Answer False,
90 degrees or 180 degrees pulse are more effective in MRI
Higher strength magnetic field Correct Answer stronger RF signal
CSF will appear as dark signal on Correct Answer T1 weighted images
CSF will appear as bright signal on Correct Answer T2 wieghted images
True or false,
A free magnet will move to align itself in a magnetic field Correct Answer true, this is
called a magnetic moment
, Nuclei used in MRI Correct Answer are found in abundance in the human body,
(Hydogen)
Have and odd number of protons and neutrons, and
Affect external magnetic field.
Part of the scanning procedure controlled by the MRI operator Correct Answer RF pulse
sequencing,
, and it is user dependent
Type of bone that MR does not image as clearly as seen in CT Correct Answer Cortical
bone
Higher magnetic strengths produce stronger RF signals and Correct Answer higher
resolution images
What special problem in MRI is caused by the extremely long scan times that must be
used Correct Answer Motion
Contraindications to the contrast media most commonly used for MRI procedures
Correct Answer Renal failure and pregnancy
What type of magnet produces a strong field up to 4T Correct Answer Superconductive
MR images are viewed in a Correct Answer Monitor
A unit of magnetic field strength Correct Answer Telsa
The protons of this element gives rise to the signal used in clinical MR imaging Correct
Answer Hydrogen
The ability to differentiate adjacent tissues Correct Answer contrast
A measurement of smallest object that we can visualize in the image Correct Answer
pixel
The tiny MR signal which results from applying the radio waves to the patient Correct
Answer echo
The MR system component that makes the "knocking" noise during an exam. Correct
Answer gradient
Energy used in MR imaging Correct Answer Radio frequency
An extremely cold liquid used in a superconducting magnet Correct Answer cryogen
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