Physicians Pre-Conference: Basics of MRI-Basic Pulse Sequences for MR Images

Basic Pulse Sequences for MR Images

Video Transcription

Video Summary

The transcript explains basic MRI pulse sequences: one-pulse experiments, gradient echo, spin echo, and steady-state free precession (SSFP). It shows how RF pulses tip magnetization into the XY plane, how gradients cause spins to dephase and rephase, and how echoes form. Gradient echo signals depend on T2* because field inhomogeneities cannot be fully canceled, while spin echoes use a 180° pulse to cancel inhomogeneity effects and reflect true T2 decay. It also describes imaging gradients, k-space, Fourier transform reconstruction, and SSFP’s use in cardiac cine, viability, and perfusion imaging.

Keywords

MRI pulse sequences

gradient echo

spin echo

steady-state free precession

k-space reconstruction