Premium
Analysis of spin‐echo rephasing with pulsatile flow in 2D FT magnetic resonance imaging
Author(s) -
Katz J.,
Peshock R. M.,
McNamee P.,
Schaefer S.,
Malloy C. R.,
Parkey R. W.
Publication year - 1987
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.1910040402
Subject(s) - pulsatile flow , nuclear magnetic resonance , acceleration , spin echo , fourier transform , flow (mathematics) , fourier analysis , physics , resonance (particle physics) , echo (communications protocol) , constant (computer programming) , magnetic resonance imaging , fourier series , spin (aerodynamics) , mechanics , mathematics , mathematical analysis , classical mechanics , atomic physics , computer science , thermodynamics , quantum mechanics , medicine , computer network , cardiology , radiology , programming language
The effects of pulsatile flow on spin phases in spin‐echo magnetic resonance imaging are considered. General expressions for the spin phases of the first four echoes are derived in terms of the Fourier coefficients of flow. These expressions are valid for any time‐dependent acceleration and, hence, are not restricted to constant acceleration. The derived expressions are then theoretically evaluated for aortic flow and examined at different points in the cardiac cycle. Our results show that rephasing may occur at certain points in the cardiac cycle for either even or odd echoes depending upon the particular Fourier coefficients of the velocity function and the spin‐echo delay time. However, even‐echo rephasing is not always necessarily valid. Furthermore, the possibility of determining the flow velocities in the body with an appropriate series of imaging studies is also discussed. © 1987 Academic Press, Inc.