Question 2934
Loss of the transverse magnetization vector over time is known as what?
Question 2935
Which of the following MRI machine components has NO direct effect on the precession frequency of hydrogen atoms?
Question 2936
The radiofrequency pulse is...
Question 2937
Protons have a spin value of ±½. Paired protons in an atomic nucleus have a net spin value of...
Question 2938
Concerning nuclear spin, which of the following is FALSE?
Question 2939
What does the T2 time constant represent?
Question 2940
Which of the following time constants is shortest?
Question 2941
Which of the following is the primary mechanism for T1 relaxation (longitudinal recovery)?
Question 2942
Which of the following will have the most T1 contrast?
Question 2943
Which of the following will prolong acquisition time?
Question 2944
In magnetic resonance imaging (MRI), which of the following does NOT affect slice thickness?
Question 2945
In MRI imaging, which of the following contributes most to nuclear precession frequency?
Question 2946
Which of the following compensates for signal loss due to magnetic field non-uniformity?
Question 2947
Half Fourier imaging results in an increase in...
Question 2948
The periphery of k-space stores information encoding predominantly for what?
Question 2949
Which of the following will increase the receiver bandwidth?
Question 2950
What effect will doubling the matrix size in the frequency encoding axis have?
Question 2951
What does a reduction in receiver bandwidth cause?
Question 2952
In a 1T magnetic field, what is the approximate difference in hydrogen precession frequency between water and fat? (The gyromagnetic ratio of hydrogen is 42.6 MHz/T)
Question 2953
What will doubling the echo train length (ETL) in fast spin echo do?