Premium
Reduction of phase error ghosting artifacts in thin slice fast spin‐echo imaging
Author(s) -
Wan Xin,
Parker Dennis L.,
Lee James N.,
Buswell Henry R.,
Gullberg Grant T.
Publication year - 1995
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.1910340422
Subject(s) - ghosting , nuclear magnetic resonance , phase (matter) , reduction (mathematics) , echo (communications protocol) , echo planar imaging , materials science , fast spin echo , computer science , physics , magnetic resonance imaging , optics , medicine , mathematics , radiology , computer network , geometry , quantum mechanics
Fast spin‐echo (FSE) imaging techniques are very sensitive to the relative phase between the 90° (excitation) RF pulse and the 180° (refocusing) RF pulses. In this paper, it is demonstrated that a phase shift can be created between the excitation and refocusing pulses in such a manner that the received signal is divided into two components of distinctly different phase shifts. The nature of these two components is reviewed. It is demonstrated that ghosting artifacts will occur when images are reconstructed from this received signal. The ghosting is shown to be object dependent. A correction technique is presented which calculates the phase errors among different echoes based on measurements from a single echo train acquired without phase encoding gradients. The results in both phantom and human studies show that this method is capable of reducing the ghosting artifact in thin slice FSE images.