AART MRI FINAL EXAM, PRACTICE EXAM TEST BANK AND
STUDY GUIDE | CONTAINS 700 QUESTIONS TOTAL WITH
ACCURATE DETAILED AND EXPERT VERIFIED ANSWERS |
EXPERT VERIFIED | GUARANTEED PASS | GRADED A | 2024
LATEST UPDATE
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%
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
normally enhancing structures post gadolinium - CORRECT ANSWER choroid plexus
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
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
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
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
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
which type of MRI magnet requires cryogens to cool magnetic coils to 4 degrees Kelvin? -
CORRECT ANSWER super conductive
currently there is no evidence of threat to fetal development from MRI exposure - CORRECT
ANSWER true
the T2 process is also known as... - CORRECT 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 - CORRECT ANSWER 37%
MRI systems require rooms that provide specific shielding requirements. these rooms are lined
with what type of materials? - CORRECT ANSWER copper or galvanized steel
the specification that is acceptable for field inhomogeneity of an MRI magnet for clinical
scanning is... - CORRECT ANSWER B) 20-30ppm
In a superconducting magnet the material employed is .....blank.......which becomes
superconductive at 4 degrees Kelvin. - CORRECT ANSWER D) niobium-titanium
the tissue characteristic that provide more tissue contrast & pathological information is... -
CORRECT ANSWER T2
In 1990 Lauffer described two types of enhancement media, the mechanism of the T2 agent is
to... - CORRECT 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... - CORRECT ANSWER C) gradient magnetic field
the purpose of magnetic resonance angiography is to image the... - CORRECT ANSWER
Blood flow
STUDY GUIDE | CONTAINS 700 QUESTIONS TOTAL WITH
ACCURATE DETAILED AND EXPERT VERIFIED ANSWERS |
EXPERT VERIFIED | GUARANTEED PASS | GRADED A | 2024
LATEST UPDATE
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%
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
normally enhancing structures post gadolinium - CORRECT ANSWER choroid plexus
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
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
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
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
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
which type of MRI magnet requires cryogens to cool magnetic coils to 4 degrees Kelvin? -
CORRECT ANSWER super conductive
currently there is no evidence of threat to fetal development from MRI exposure - CORRECT
ANSWER true
the T2 process is also known as... - CORRECT 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 - CORRECT ANSWER 37%
MRI systems require rooms that provide specific shielding requirements. these rooms are lined
with what type of materials? - CORRECT ANSWER copper or galvanized steel
the specification that is acceptable for field inhomogeneity of an MRI magnet for clinical
scanning is... - CORRECT ANSWER B) 20-30ppm
In a superconducting magnet the material employed is .....blank.......which becomes
superconductive at 4 degrees Kelvin. - CORRECT ANSWER D) niobium-titanium
the tissue characteristic that provide more tissue contrast & pathological information is... -
CORRECT ANSWER T2
In 1990 Lauffer described two types of enhancement media, the mechanism of the T2 agent is
to... - CORRECT 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... - CORRECT ANSWER C) gradient magnetic field
the purpose of magnetic resonance angiography is to image the... - CORRECT ANSWER
Blood flow
