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Imaging longitudinal cardiac strain on short-axis images using strain-encoded MRI
N F Osman1, S Sampath, E Atalar
1Department of Radiology, The Johns Hopkins University, Baltimore, Maryland 21287-0845, USA. nael@jhu.edu
Abstract:
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.