RF Rephasing - Video Lesson

Hey, everybody. Welcome to today's lesson on spin echo pulse sequences. This lesson focuses on radio frequency or RF rephrasing pulses and their purpose in a spin echo pulse sequence. Spin echo pulse sequences are a fundamental concept and process in MRI, so understanding how they work is important. Let's begin. A spin echo pulse sequence is a method used in MRI to refocus the spins of hydrogen nuclei in the body, correcting for defacing caused by inhomogeneities in the magnetic field. In other words, spin echo pulse sequences correct for phase discrepancies in the spinning nuclei. Remember, in an ideal world, the magnetic field in an MRI scanner would be perfectly uniform or homogeneous. T two decay time is based on this ideal world where transverse magnetization is only lost because of spin spin interactions. However, the magnetic field in MRI scanners is not perfectly uniform, and it contains inhomogeneities. Also, patient