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Determination of transmural, endocardial, and epicardial radial strain and strain rate from phase contrast MR velocity data
Author(s) -
Delfino Jana G.,
Fornwalt Brandon K.,
Eisner Robert L.,
Leon Angel R.,
Oshinski John N.
Publication year - 2008
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.21211
Subject(s) - steady state free precession imaging , strain (injury) , radial stress , basal (medicine) , strain rate , magnetic resonance imaging , phase contrast microscopy , nuclear magnetic resonance , materials science , cardiology , medicine , anatomy , physics , deformation (meteorology) , radiology , optics , insulin , metallurgy , composite material
Purpose To develop a method for computing radial strain (ε) and strain rate (SR) from phase contrast magnetic resonance (PCMR) myocardial tissue velocity data. Materials and Methods PCMR tissue velocity maps were acquired at basal and mid‐short‐axis slices in the myocardium in 10 healthy volunteers. An algorithm for computing radial strain and SR from PCMR tissue velocity data was developed. PCMR strain values were compared to values computed independently from contours drawn on cine steady‐state free procession (SSFP) images. Peak endocardial and epicardial strain and SR values from PCMR data were compared. Results Excellent agreement was observed between peak strain values computed by PCMR and cine SSFP contours (38.1 ± 5.4% vs. 38.1 ± 6.2%; P = not significant [NS]). The presence of an endocardial‐epicardial gradient was demonstrated in both strain and SR: peak endocardial values were larger than peak epicardial values in the basal and mid‐short‐axis slices (P < 0.05). Conclusion This study presents a method for determining radial strain and SR values from PCMR velocity data. This technique illustrates a difference in strain and SR across the myocardium with peak endocardial values being greater than peak epicardial values. J. Magn. Reson. Imaging 2008. © 2008 Wiley‐Liss, Inc.