ARMRIT PRACTICE TEST QUESTIONS WITH VERIFIED
ANSWERS
Magnetism is the ability of certain materials to attract: - ANSWER Iron,
Cobalt, Nickel
Components of the Gyro-magnetic ratio are: - ANSWER Magnetic moment to
angular momentum
Which type of electromagnetic coils induce smaller magnetic field which allow
spatial localization to be performed? - ANSWER Gradient coils
Which type of MRI magnet employs cryogen to refrigerate magnetic coils to 4
degrees Kelvin? - ANSWER Superconductive
T2 is the time interval for the transverse component of the net magnetization
vector to decrease what percentage of its maximum value after application of a
90 degree radio frequency pulse: - ANSWER 37%
What cryogenic material can produce a temperature as low as 4 degrees Kelvin?
- ANSWER Liquid Helium
T1 process is also known as - ANSWER Spin-Lattice
90 degree radio-frequency pulse will alter the net magnetization vector. Another
effect is: - ANSWER The hydrogen protons will have phase coherence.
Which type of MRI magnet does not require any electricity to maintain its
magnetic field and can range in weight from 18,000 lb. to 200,000 lb.? -
ANSWER Permanent
In order to describe the uniformity of the main magnetic field of the MRI
system, the word applied is - ANSWER Homogeneity
ANSWERS
Magnetism is the ability of certain materials to attract: - ANSWER Iron,
Cobalt, Nickel
Components of the Gyro-magnetic ratio are: - ANSWER Magnetic moment to
angular momentum
Which type of electromagnetic coils induce smaller magnetic field which allow
spatial localization to be performed? - ANSWER Gradient coils
Which type of MRI magnet employs cryogen to refrigerate magnetic coils to 4
degrees Kelvin? - ANSWER Superconductive
T2 is the time interval for the transverse component of the net magnetization
vector to decrease what percentage of its maximum value after application of a
90 degree radio frequency pulse: - ANSWER 37%
What cryogenic material can produce a temperature as low as 4 degrees Kelvin?
- ANSWER Liquid Helium
T1 process is also known as - ANSWER Spin-Lattice
90 degree radio-frequency pulse will alter the net magnetization vector. Another
effect is: - ANSWER The hydrogen protons will have phase coherence.
Which type of MRI magnet does not require any electricity to maintain its
magnetic field and can range in weight from 18,000 lb. to 200,000 lb.? -
ANSWER Permanent
In order to describe the uniformity of the main magnetic field of the MRI
system, the word applied is - ANSWER Homogeneity
