Superconducting wire is used in MRI magnet construction because:
A. ) it is stronger than copper wire.
B. ) its resistance is 0 at 0 degrees C and can carry high current.
C. ) its resistance is 0 at 4K and produces very stable magnetic fields.
查看答案
In an inversion-recovery experiment, at the null point, t0, for a tissue with a short T1 relaxation time, the tissue will:
A. ) have an observable signal, while long T1 tissue will have no signal.
B. ) have no observable signal, while long T1 tissue will have signal.
C. ) have a similar signal intensity to long T1 tissue.
Fourier Transform of the raw data with respect to the phase direction results in the representation of signal intensity as a function of:
A. ) time.
B. ) frequency.
C. ) position.
The phase gradient encodes:
A. ) the projection intensity and phase along the read gradient direction.
B. ) the projection intensity and phase along the phase gradient direction.
C. ) the phase gradient field strength at each position along the read direction.
In slice selection, for a particular slice gradient strength, a longer RF pulse time will:
A. ) select a thinner slice.
B. ) select a thicker slice.
C. ) increase the steepness of the field gradient.
微信支付 
支付宝支付