Gradient Echo Sequences in MRI

These flashcards cover key terms and concepts related to gradient echo sequences in MRI as outlined in the lecture transcript.

Gradient Echo Pulse Sequence

A pulse sequence used in MRI that uses gradients along with radiofrequency pulses to acquire images.

Coherent Gradient Echo

A GRE pulse sequence used to create T2*W images, which is faster than conventional gradient echo sequences.

Rewinder Gradient

An extra gradient pulse used at the end of the gradient echo pulse sequence to maintain coherency of residual magnetization.

Spoiled Gradient Echo

A gradient echo sequence that creates T1W or PDW images by spoiling transverse magnetization.

RF Spoiling

A method of spoiling where each RF excitation pulse has a slightly higher power, eliminating transverse magnetization.

Echo Planar Imaging (EPI)

A rapid acquisition technique in MRI that captures images using multiple gradient echoes after a sequence of RF pulses.

Single Shot EPI

An EPI technique where all k-space lines are filled with multiple gradient reversals in a single acquisition.

Multi-shot EPI

An EPI technique using more than one excitation pulse to collect some, but not all, echoes with gradient pulses.

Chemical Shift Artifact

An artifact in MRI caused by variations in resonating frequencies of fat and water protons, occurring along the phase encode axis.

Advantages of Fast Gradient Echo

Includes faster scan times, reduced sequence time, and utilization of various k-space techniques.