Chapter 5: Self-assessment Questions

1. What is contrast? What are the differences between endogenous and exogenous contrast? Between static and motion contrast?
2. What property of tissue does a proton density image show? What TR and TE are needed to achieve proton density imaging?
3. What do T1-weighted images show? What TR and TE are needed to achieve T1-weighting?
4. What do T2-weighted images show? What TR and TE are needed to achieve T2-weighting?
5. How are T1 and T2 images different in what they show? That is, why would someone use a T2 image instead of a T1 image, or vice versa?
6. What do T2* images show? What TR and TE are needed to achieve T2*-weighting?
7. What is MR angiography (MRA)? Why might exogenous contrast agents be used in MRA?
8. What are the differences between time-of-flight and velocity-encoded MRA?
9. What does diffusion imaging intend to measure? What is the ADC, and what does it represent?
10. Why might diffusion be anisotropic? What does FA represent?
11. What does perfusion MRI measure?
12. What is arterial spin labeling? What are the differences between continuous and pulsed ASL?
13. How does echo-planar imaging sample k-space?
14. What are magnetic susceptibility artifacts?
15. How does spiral imaging sample k-space?