MRI ARMRIT physics Exam Questions With
Correct Answers
T2 is the measurement of time for the transverse component of the net
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magnetization vector to decrease what percentage of its maximum value after
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the application of a 90 degree radio frequency pulse - CORRECT ANSWER✔✔-
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37%
The NMV is rotated to the physical negative Z axis by applying a...? - CORRECT
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ANSWER✔✔-C)180 pulse |
Increasing which parameter is considered the "best" technique for improving
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image quality? - CORRECT ANSWER✔✔-C)NEX
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Studies have concluded that static magnetic fields up to what tesla produce no
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substantial harmful biological effects. - CORRECT ANSWER✔✔-C)2.0
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Tissues that have low (short) relaxation times have: - CORRECT ANSWER✔✔-
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Higher relaxation rates | |
Nuclei in their natural enviroment ( in the absence of a significant magnetic field)
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are aligned... - CORRECT ANSWER✔✔-Randomly
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Following the injection of a gadolinium enhancement agent, the pulse sequence
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most commonly employed is a... - CORRECT ANSWER✔✔-C)T1 weighted
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, Employing a pulse sequence with a long TR & a long TE will result in tissues with
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a short T2 value appearing WHAT & tissues with a long T2 appearing WHAT on
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the resultant image. - CORRECT ANSWER✔✔-D)Dark/bright
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Which gradient axis direction is typically (for educational purposes) designated as
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the slice selection gradient? - CORRECT ANSWER✔✔-C)Logical Z gradient
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Electromagnetic coils placed strategically to contain the fringe fields. - CORRECT
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ANSWER✔✔-2)Active shielding |
1 milliliter of H2O contains how many hydrogen protons? - CORRECT
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ANSWER✔✔-6 ×10 to th 23power | | | |
Which of the following statements is true for gadolinium MRI IV enhancement
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products? - CORRECT ANSWER✔✔-B) produces randomly fluctuating magnetic
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fields in its immediate enviroment.
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The maximum exposure to radiofrequency in 1 gram of tissue is: - CORRECT
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ANSWER✔✔-D) a maximum spatial peak of 8 w/kg | | | | | | |
Currently, patients & personnel arr exluded from exposure to MRI for the 1st
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trimester of pregnancy. - CORRECT ANSWER✔✔-True
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The maximum exposure to radio frequency averaged over the head is: - CORRECT
| | | | | | | | | | | | |
ANSWER✔✔-B)No more than 3.2 w/kg | | | |
Correct Answers
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%
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
| | | | |
The maximum exposure to radio frequency averaged over the head is: - CORRECT
| | | | | | | | | | | | |
ANSWER✔✔-B)No more than 3.2 w/kg | | | |
