phase encoding
MRI spatial encoding technique that uses gradient-induced phase shifts to localize signal along one axis of the image.
Full Definition
Phase encoding is a fundamental MRI technique that spatially localizes signal by applying gradient pulses that induce position-dependent phase shifts in the magnetic resonance signal. Unlike frequency encoding which occurs during readout, phase encoding occurs between excitation and readout, with different phase-encoding steps collected in separate repetitions. The direction of phase encoding can affect artifact patterns, particularly motion artifacts and susceptibility distortions, making the choice of phase-encoding direction critical in neuroimaging protocols.
Usage
Usage note: May be hyphenated or written as two words; maintain consistency within documents.
In Context
- "The phase encoding direction was set anterior-posterior to minimize susceptibility artifacts." — MRI protocol specification
- "Motion artifacts were more prominent along the phase encoding axis in this acquisition." — Image quality assessment