Weighting in Gradient Echo Pulse Sequences - Video Lesson

Hey, everybody. Welcome back to today's lesson about pulse sequences. This lesson focuses on weighting in gradient echo pulse sequences. In particular, the impact of extrinsic parameters. Understanding these processes is vital for knowing how to set parameters for a gradient echo pulse sequences. Let's get started. Remember, gradient echo pulse sequences rely on the use of variable excitation pulses, resulting in variable flip angles and gradient fields to rephase the nuclei rather than the ninety degree excitation pulses and one hundred eighty degree rephrasing pulses used in spin echo sequences. Waiting in gradient echo pulse sequences refers to the manipulation of imaging parameters to highlight specific tissue properties, such as t one, t two or proton density contrast. There are three processes that impact waiting in gradient echo pulse sequences. They are the extrinsic parameters, t r, t e, and flip angle. These