The Steady State - Video Lesson

Hey, everybody. Welcome back to today's lesson about pulse sequences. This lesson focuses on waiting in gradient echo pulse sequences. In particular, the role of the steady state and the influence of residual transverse magnetization. Understanding these processes is vital for knowing how to set parameters for 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 and t two contrast. There are two processes that impact weighting in gradient echo pull sequences. These processes are the extrinsic parameters, TR and flip angle. These parameters can be used