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SSFP and GRE phase contrast imaging using a three‐echo readout
Author(s) -
Nielsen JonFredrik,
Nayak Krishna S.
Publication year - 2007
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.21276
Subject(s) - steady state free precession imaging , precession , nuclear magnetic resonance , physics , gradient echo , scanner , contrast (vision) , phase (matter) , offset (computer science) , magnetic resonance imaging , optics , materials science , computer science , radiology , medicine , astronomy , programming language , quantum mechanics
A technique for rapid in‐plane phase‐contrast imaging with high signal‐to‐noise ratio (SNR) is described. Velocity‐encoding is achieved by oscillating the readout gradient, such that each 2DFT phase‐encode is acquired three times following a single RF slice‐selective excitation. Three images are reconstructed, from which both flow velocity and local resonance offset are calculated. This technique is compatible with both gradient‐recalled echo (GRE) and balanced steady‐state free precession (SSFP) imaging using a single steady‐state. The proposed technique enables 1D velocity mapping with 40% higher temporal resolution and 80% higher SNR, compared to conventional PC‐MRI using bipolar velocity‐encoding gradient pulses. Magn Reson Med, 2007. © 2007 Wiley‐Liss, Inc.