Imaging longitudinal cardiac strain on short‐axis images using strain‐encoded MRI

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 direction 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 encoding values. Longitudinal strains acquired from a normal human male are shown. Magn Reson Med 46:324‐334, 20001. © 2001 Wiley‐Liss, Inc.

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