Three-dimensional magnetization-prepared time-of-flight MR angiography of the carotid and vertebral arteries.

摘要: Three-dimensional magnetization-prepared (MP) MR angiography (MRA) was applied to the carotid and vertebral arteries by using ECG triggering, a slab selective RF inversion pulse, centric phase encoding acquisition during diastole. Both theoretically experimentally, MP MRA sequence shown perform well in cases where there substantial blood replenishment time TI (>330 ms). In comparison with standard, ungated, steady-state 3D time-of-flight 13 consecutive volunteers, images demonstrated better background suppression less artifact generally had more uniform vessel depiction. The superior for portraying vessels exhibiting high pulsatility such as siphon. However, distal slow flow incomplete replenishment, technique inferior due increased loss of signal. reasons this signal are identified improvements suggested.