Unsupervised reconstruction of a three-dimensional left ventricular strain from parallel tagged cardiac images.

Denney, Thomas S;Gerber, Bernhard;Yan, Litao
(2003) Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine — Vol. 49, n° 4, p. 743-754 (2003)

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Abstract
A new algorithm, called the Unsupervised Tag ExTraction and Heart strain(E) Reconstruction (UNTETHER) algorithm, is presented for quantifying three-dimensional (3D) myocardial strain in tagged cardiac MR images. Five human volunteers and five postinfarct patients were imaged. 3D strains measured by UNTETHER and a user-supervised technique were compared. Each study was analyzed in 49 +/- 8 min with UNTETHER, compared to approximately 4 hr with the user-supervised technique. For pooled human data, the correlation coefficient between the two methods for circumferential shortening (E(cc)) was r = 0.91 at the mid-wall (P < 0.0005). UNTETHER is capable of measuring wall motion abnormalities resulting from coronary artery disease, and has the potential to overcome the main limitations (time and user-supervision requirements) to routine clinical use of tagged cardiac MRI.
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Denney, T. S., Gerber, B., & Yan, L. (2003). Unsupervised reconstruction of a three-dimensional left ventricular strain from parallel tagged cardiac images. Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine, 49(4), 743-754. https://doi.org/10.1002/mrm.10434 (Original work published 2003)