In a spin echo pulse sequence, which of the following eliminates T2* effects by rephrasing
the transverse magnetization and producing the echo? - ANSWER 180-degree RF pulse
In a spin echo pulse sequence, a 180-degree RF refocusing pulse produces a signal echo
and... - ANSWER Eliminates rephrasing due to magnetic field inhomogeneities
In an inversion recovery pulse sequence, the initial excitation pulse drives the longitudinal
magnetization from +Z direction to which of the following directions? - ANSWER -Z
Which of the following parameters will influence T1 contrast in a GRE pulse sequence? -
ANSWER Flip angle
In a fast(Turbo) spin echo pulse sequence, the initial slice excitation pulse is followed by a
series of which of the following? - ANSWER 180 radio frequency induced echoes
Which of the following is not an advantage of superconducting magnets? - ANSWER
Quick turn-off capability
Superconducting magnet coils exhibit what type of resistance when operating at or below
critical temperature? - ANSWER Zero resistance
In a permanent magnet design, which of the following best describes the direction of the
main magnetic field? - ANSWER Parallel to the long axis of a body in the magnet.
What is the cryogen in a superconducting magnet? - ANSWER Liquid helium
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the transverse magnetization and producing the echo? - ANSWER 180-degree RF pulse
In a spin echo pulse sequence, a 180-degree RF refocusing pulse produces a signal echo
and... - ANSWER Eliminates rephrasing due to magnetic field inhomogeneities
In an inversion recovery pulse sequence, the initial excitation pulse drives the longitudinal
magnetization from +Z direction to which of the following directions? - ANSWER -Z
Which of the following parameters will influence T1 contrast in a GRE pulse sequence? -
ANSWER Flip angle
In a fast(Turbo) spin echo pulse sequence, the initial slice excitation pulse is followed by a
series of which of the following? - ANSWER 180 radio frequency induced echoes
Which of the following is not an advantage of superconducting magnets? - ANSWER
Quick turn-off capability
Superconducting magnet coils exhibit what type of resistance when operating at or below
critical temperature? - ANSWER Zero resistance
In a permanent magnet design, which of the following best describes the direction of the
main magnetic field? - ANSWER Parallel to the long axis of a body in the magnet.
What is the cryogen in a superconducting magnet? - ANSWER Liquid helium
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