MRI ARMRIT PHYSICS TEST QUESTIONS WITH CORRECT
ANSWERS
T2 is the duration for which the transverse component of the net magnetization
vector decreases what percentage of its maximum value after the application of
a 90 degree radio frequency pulse - ANSWER 37%
NMV is tilted into the physical negative Z axis with a.? - ANSWER C)180
pulse
Increasing which parameter is the "best" method to increase image quality? -
ANSWER C)NEX
Experiments have established that static magnetic fields of up to what tesla
cause no appreciable adverse biological effects. - ANSWER C)2.0
Low (short) relaxation time tissues have: - ANSWER Higher relaxation rates
Nuclei in their natural enviroment (no big magnetic field present) are oriented. -
ANSWER Randomly
After giving an intravenous gadolinium enhancement agent, the most commonly
used pulse sequence is a. - ANSWER C)T1 weighted
By applying a pulse sequence with TR long & TE long will cause tissues with
short T2 value to appear WHAT & tissues with long T2 to appear WHAT on
the output image. - ANSWER D)Dark/bright
Which direction for the gradient is generally (for teaching) designated as the
slice selection gradient? - ANSWER C)Logical Z gradient
, Electromagnetic coils placed in positions that serve to contain the fringe fields. -
ANSWER 2)Active shielding
1 milliliter of H2O contains how many hydrogen protons? - ANSWER 6 ×10 to
the 23rd power
Which of the following is a true statement concerning gadolinium MRI IV
enhancing products? - ANSWER B) induces randomly varying magnetic fields
in its local enviroment.
Maximum exposure to radiofrequency in 1 gram of tissue is: - ANSWER D) a
maximum spatial peak of 8 w/kg
Patients & personnel are currently exempted from exposure to MRI for the 1st
trimester pregnancy. - ANSWER True
The maximum radio frequency exposure averaged over the head is:
- ANSWER B) No more than 3.2 w/kg
The amplitude of the receive signal for a pixel typically depends on thr
substance's.
- ANSWER A) T1, T2, proton density
Small magnetic field introduced to hydrogen protons such that they will
transition from low energy state to high energy state is. - ANSWER C) RF
pulse
at any one moment, human body tissue in general, is comprised of 50%-90% of
what substance? - ANSWER Hydrogen.
once the region of interest to the patient is placed in the middle magnetic field
of the MRI system, the hydrogen protons will.
- ANSWER precess parallel to B sub zero
In most tissues hydrogen concentration varies - ANSWER 10%- to 15%
ANSWERS
T2 is the duration for which the transverse component of the net magnetization
vector decreases what percentage of its maximum value after the application of
a 90 degree radio frequency pulse - ANSWER 37%
NMV is tilted into the physical negative Z axis with a.? - ANSWER C)180
pulse
Increasing which parameter is the "best" method to increase image quality? -
ANSWER C)NEX
Experiments have established that static magnetic fields of up to what tesla
cause no appreciable adverse biological effects. - ANSWER C)2.0
Low (short) relaxation time tissues have: - ANSWER Higher relaxation rates
Nuclei in their natural enviroment (no big magnetic field present) are oriented. -
ANSWER Randomly
After giving an intravenous gadolinium enhancement agent, the most commonly
used pulse sequence is a. - ANSWER C)T1 weighted
By applying a pulse sequence with TR long & TE long will cause tissues with
short T2 value to appear WHAT & tissues with long T2 to appear WHAT on
the output image. - ANSWER D)Dark/bright
Which direction for the gradient is generally (for teaching) designated as the
slice selection gradient? - ANSWER C)Logical Z gradient
, Electromagnetic coils placed in positions that serve to contain the fringe fields. -
ANSWER 2)Active shielding
1 milliliter of H2O contains how many hydrogen protons? - ANSWER 6 ×10 to
the 23rd power
Which of the following is a true statement concerning gadolinium MRI IV
enhancing products? - ANSWER B) induces randomly varying magnetic fields
in its local enviroment.
Maximum exposure to radiofrequency in 1 gram of tissue is: - ANSWER D) a
maximum spatial peak of 8 w/kg
Patients & personnel are currently exempted from exposure to MRI for the 1st
trimester pregnancy. - ANSWER True
The maximum radio frequency exposure averaged over the head is:
- ANSWER B) No more than 3.2 w/kg
The amplitude of the receive signal for a pixel typically depends on thr
substance's.
- ANSWER A) T1, T2, proton density
Small magnetic field introduced to hydrogen protons such that they will
transition from low energy state to high energy state is. - ANSWER C) RF
pulse
at any one moment, human body tissue in general, is comprised of 50%-90% of
what substance? - ANSWER Hydrogen.
once the region of interest to the patient is placed in the middle magnetic field
of the MRI system, the hydrogen protons will.
- ANSWER precess parallel to B sub zero
In most tissues hydrogen concentration varies - ANSWER 10%- to 15%
