MRI-ARRT Study Guide Questions/ Exam Questions with
Correct Verified Answers – Latest Update 2024.
The NMV is rotated to the physical negative Z axis by applying a...? - Correct Answer - C)180 pulse
Increasing which parameter is considered the "best" technique for improving image quality? - Correct
Answer - C)NEX
Studies have concluded that static magnetic fields up to what tesla produce no substantial harmful
biological effects. - Correct Answer - C)2.0
Tissues that have low (short) relaxation times have: - Correct Answer - Higher relaxation rates
Nuclei in their natural enviroment ( in the absence of a significant magnetic field) are aligned... - Correct
Answer - Randomly
Following the injection of a gadolinium enhancement agent, the pulse sequence most commonly
employed is a... - Correct Answer - C)T1 weighted
Employing a pulse sequence with a long TR & a long TE will result in tissues with a short T2 value
appearing WHAT & tissues with a long T2 appearing WHAT on the resultant image. - Correct Answer -
D)Dark/bright
Which gradient axis direction is typically (for educational purposes) designated as the slice selection
gradient? - Correct Answer - C)Logical Z gradient
Electromagnetic coils placed strategically to contain the fringe fields. - Correct Answer - 2)Active
shielding
pg. 1
,1 milliliter of H2O contains how many hydrogen protons? - Correct Answer - 6 ×10 to th 23power
Which of the following statements is true for gadolinium MRI IV enhancement products? - Correct
Answer - B) produces randomly fluctuating magnetic fields in its immediate enviroment.
The maximum exposure to radiofrequency in 1 gram of tissue is: - Correct Answer - D) a maximum
spatial peak of 8 w/kg
Currently, patients & personnel arr exluded from exposure to MRI for the 1st trimester of pregnancy. -
Correct Answer - True
The maximum exposure to radio frequency averaged over the head is: - Correct Answer - B)No more
than 3.2 w/kg
The recieve signal amplitude for a pixel usually depends on thr substance's... - Correct Answer - A) T1, T2
, proton density
Small magnetic field intoduced to the hydrogen protons in order to cause them yo move from the low
energy state to the high energy state is... - Correct Answer - C) RF pulse
at any one time, human body tissue, in general, is made up of 50%-90% of what substance? - Correct
Answer - Hydrogen.
once the patient's area of interest is placed in the main magnetic field of the MRI system, the hydrogen
protons will... - Correct Answer - precess parallel to B sub zero
In most tissues hydrogen concentration varies - Correct Answer - 10%- to 15%
T1 is the measurement of time for the longitudinal component of the net magnetization vector to
recover what percentage of its original value after the application of a 90 degree radio frequency pulse? -
Correct Answer - 63%
pg. 2
,because of the spinning motion of the hydrogen proton, it has the same properties as a bar magnet. the
hydrogen proton spinning motion gives it a... - Correct Answer - magnetic moment
Magnetic resonance imaging is derived from the process known as... - Correct Answer - Nuclear
magnetic resonance
because of only a 10% to 15% variation in most tissues, the tissue character that does not provide much
contrast resolution... - Correct Answer - hydrogen concentration
An inversion recovery pulse sequence can be which of the following? - Correct Answer - ACC
RF.
average over the whole body is answer 1.
averaged over the head is answer 2.
in one gram (1gr) of tissue is answer 3. - Correct Answer - 1.C) no more than 0.4 w/kg
2.A) no more than 3.2w/kg
3.B) maximum spatial peak if 8 w/kg
on T1 weighted images sub-acute hemorrhage will appear bright? - Correct Answer - TRUE
which characteristic of tissue, in MRI, is the result of fast transition phenomenon &/or entry
phenomenon? - Correct Answer - flow/velocity effects
radio frequency RF coils that are placed close to the patient's body specifically for structures that are
superficial & are receive coils only are... - Correct Answer - surface coils
chemical shift artifacts will show up on the image in what gradient direction? - Correct Answer - B)
frequency encoding
pg. 3
, coils that superimpose small magnetic fields within the patient during the MRI process & allow for
special encoding are... - Correct Answer - gradient coils
In an Inversion Recovery pulse sequence what TI will produce STIR fat-suppressed pulse sequence? -
Correct Answer - 80-120
The Larmor precessional or resonance frequency of hydrogen protons in a static magnetic field of 0.5 is
approximately... - Correct Answer - 21.288 MHz
Residual, undesirable gradient magnetic fields that persist for a variable time duration after the pulse of
electricity from the gradient power supply is terminated are known as... - Correct Answer - Eddy Currents
which parameter in a pulse sequence helps to prevent "cross talk" between 2 adjacent images? - Correct
Answer - Slice intervals
Patients that have implants such as a pacemaker or neurstimulator should not go beyond the... - Correct
Answer - 5 gauss line
when increasing the parameter matrix, the pixel size will... - Correct Answer - decrease
once the MRI patient is comfortable & has no apparent problem with the overall procedure, it is
acceptable for the technologist to leave the scanning area while a long scan is underway - Correct
Answer - false
the time interval between 90 degree RF pulses. - Correct Answer - TR
the tissue characteristic which depends more on the state (solid, liquid, gas) of a tissue than other factor
is... - Correct Answer - T2 effects
after a 90 degree radio frequency pulse, the net magnetization vector begins to return to equilibrium.
When NMV is half-way between transverse & equilibrium, what are the magnitudes of the longitudinal
component & the transverse component? - Correct Answer - longitudinal component= greater than zero
transverse component = greater than zero
pg. 4
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