Decreasing the receiving bandwidth will be lengthening the sample time. This may force us to
increase our TE as well as the TR. Increasing the field of view will also allow for longer echo
spacing.
The differences in magnetic field strength as you approach the MRI unit is termed what?
a. Spatial magnetic gradient
b. Gauss line
c. RF energy
d. Gradient coils - answer✔✔a. Spatial magnetic gradient
Measured in dB/dx
Which of the following produce the greatest chance for peripheral nerve stimulation?
a. Conventional spin echo
b. Fast spin echo
c. Gradient echo
d. EPI - answer✔✔d. EPI
A deflection of 45 degrees in a tested implant indicates that it deflects at a force equal to what?
a. 0.5 gravity force
b. 2 gravity force
c. 0.25 gravity force
d. 1 gravity force - answer✔✔d. 1 gravity force
4T/m is equal to what?
1T = 10,000 G
1m = 100 cm
Therefore, 1 T/m=10,000G/100cm
This means that 1 T/m=100 G/cm
How do we calculate the maximal spatial gradient?
a. dB/dx * B
b. dB/dt * W/kg
c. W/kg
d. B - answer✔✔a. dB/dx * B
What group issued the ACR white paper MRI safety?
a. ACR Blue Ribbon Panel on MR safety
b. FDA
c. OSHA
d. EPA - answer✔✔a. ACR Blue Ribbon Panel on MR safety
Which of the following is true of a gad contrast osmolarity?
a. Less than blood
b. Greater than blood
c. Less than water
d. Equal to blood - answer✔✔b. Greater than blood (and greater than water)
Which of the following is true if we increase the field of view from 200mm to 400mm?
a. We reduce patient heating
b. We use a stronger time-varying gradient magnetic field
c. We use a weak time-varying gradient magnetic field
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