Determination of transmural, endocardial, and epicardial radial strain and strain rate from phase contrast MR velocity data.
OBJECTIVE
To develop a method for computing radial strain (epsilon) and strain rate (SR) from phase contrast magnetic resonance (PCMR) myocardial tissue velocity data.


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).


CONCLUSIONS
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.
Delfino
Jana G
JG
Department of Biomedical Engineering, Georgia Institute of Technology/Emory University, Atlanta, GA 30322, USA. jana.delfino@gatech.edu
Fornwalt
Brandon K
BK
Eisner
Robert L
RL
Leon
Angel R
AR
Oshinski
John N
JN
D000328:Adult; D004699:Endocardium / Q000502:physiology; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D010496:Pericardium / Q000502:physiology