SAQs - Chapter 8
1. What sequences are appropriate for bright blood imaging?
Using coherent and balanced gradient echo sequences.
2. In what ways can tissues with a short T1 relaxation time be suppressed in TOF-MRA?
Using an out-of-phase TE and MTC.
3. Why do we use a trigger window in gating?
To give the system time to wait for the next R wave.
4. What is the available imaging time using these parameters? RR 800 ms trigger window 10% delay after trigger 4 m.
716 ms.
5. Indicate when you would use ECG, peripheral gating or nothing when examining the following areas:
• brain
• knee
• liver
• mediastinum
• peripheral
• none
• peripheral
• ECG