Analyzing Myocardial Torsion based on Tissue Phase Mapping MRI

This work presents a novel, robust approach to compute myocardial torsion from Tissue Phase Mapping (TPM) MRI, capable of capturing transmural twisting patterns. A high resolution temporal velocity field of the heart muscle is acquired for three short-axis TPM slices, from which the average rotational velocity is computed. Torsion is quantified as the difference in rotational motion between heart slices over time, normalized by slice distance. Torsion parameter is compared with domain expert assessment of ejection fraction, delayed enhancement and wall motion abnormalities for cardiomyopathy patients and healthy volunteers showing potential for predicting cardiac contraction problems.

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