NEW
Font size
WorksheetsQuiz 1 MRI
Total questions: 12
Worksheet time: 12mins
1. The superconducting MR scanner contains all of the following except
Liquid helium
Liquid nitrogen
Main magnet coil
Superconducting shim coils
2. Magnetic field gradients for imaging are typically measured in units of
Millitesla per meter (mT/m)
Gauss per second (G/s)
Tesla (T)
Tesla per meter per second (T/m-s)
3. In order to perform an MRI experiment, we first need to
Apply a radiofrequency pulse in a different direction from B0
Apply a radiofrequency pulse along B0
Change the strength of B0
Apply a magnetic field gradient
4. A spin echo is formed by
Reversing the direction of B0
Flipping proton direction by a radiofrequency pulse
Applying a negative magnetic field gradient
5. The fast spin echo sequence alters the spin echo sequence by
Adding successive 90-degree pulses
Adding successive frequency-encoding gradients
Adding successive 180-degree pulses
Adding successive spoiler gradients
6. Compared with spin echo (SE), the gradient echo (GRE) sequence
Has a 180-degree pulse and demonstrates T2* dephasing
Has no 180-degree pulse and demonstrates T2* dephasing
Has a 180-degree pulse and demonstrates T2 dephasing
Has no 180-degree pulse and demonstrates T2 dephasing
7. Compared with SE, GRE sequences use
Longer TR and longer TE
Shorter TR and longer TE
Longer TR and shorter TE
Shorter TR and shorter TE
8. How is proton-density weighting achieved?
Short TR, long TE
Long TR, short TE
Short TR, short TE
9. What color is water in a T1 weighted MRI scan?
White
Dark grey
Black
Light grey
10. Increasing TR:
Decreases T1-weighting
Increases T1-weighting
Decreases T2-weighting
Increases T2-weighting
11. Increasing TE:
Decreases T1-weighting
Increases T1-weighting
Decreases T2-weighting
Increases T2-weighting
12. T1 recovery:
63% to max longitudinal magnetization
37% of maximum signal
