Cardiac strain calculation from tagged MR images via Moire analysis

摘要

A simple algorithm is proposed for calculating cardiac strain from a tagged magnetic resonance (MR) image via Moire analysis. Tagged MR images are used to obtain a cardiac strain in internal organ, particularly myocardial strain. In conventional methods, some approaches for passive image analysis are used. Optical flow calculation based on the gradient method and some regularization methods regarded as an ill-posed problem are representative. In the present paper, a simple, fast, and accurate algorithm is proposed that applies the principle of Moire topography for extracting strains in tissues. The proposed method provides reliability from the tagged image without prior knowledge of regularization. The effectiveness of the present paper is confirmed by a simulation and an experiment using a real tagged MR image sequence.