MRI ARMRIT physics UPDATED Exam Questions and CORRECT Answers
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Course
ARMRIT
Institution
ARMRIT
MRI ARMRIT physics UPDATED Exam
Questions and 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 ...
MRI ARMRIT physics UPDATED Exam
Questions and 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
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%
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