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Imaging Longitudinal Cardiac Strain on Short-Axis Images Using Strain-Encoded MRI

Summary: Imaging Longitudinal Cardiac Strain on Short-Axis
Images Using Strain-Encoded MRI
Nael F. Osman,1* Smita Sampath,2
Ergin Atalar,1
and Jerry L. Prince2
This article presents a new method for measuring longitudinal
strain in a short-axis section of the heart using harmonic phase
magnetic resonance imaging (HARP-MRI). The heart is tagged
using 1-1 SPAMM at end-diastole with tag surfaces parallel to a
short-axis imaging plane. Two or more images are acquired
such that the images have different phase encodings in a di-
rection orthogonal to the image plane. A dense map of the
longitudinal strain can be computed from these images using a
simple, fast computation. Simulations are conducted to study
the effect of noise and the choice of out-of-plane phase encod-
ing values. Longitudinal strains acquired from a normal human
male are shown. Magn Reson Med 46:324334, 2001.
2001 Wiley-Liss, Inc.
Key words: cardiac motion; harmonic phase; magnetic reso-
nance tagging; myocardial strain


Source: Atalar, Ergin - Department of Electrical and Electronics Engineering, Bilkent University
Prince, Jerry L. - Department of Electrical and Computer Engineering, Johns Hopkins University


Collections: Biology and Medicine; Computer Technologies and Information Sciences; Engineering