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Model‐free reconstruction of three‐dimensional myocardial strain from planar tagged MR images

A technique is presented for reconstructing a three‐dimensional myocardial strain map from a set of parallel‐tagged MR images. Radial strains were reconstructed from in vivo data from an anesthetized dog with values between .05 and .1 with a precision of ± .003 for a tag detection accuracy of .1 mm and a tag spacing of 2.5 mm. The reconstruction spatial resolution was demonstrated by reconstructing a localized displacement abnormality. In the circumferential direction, the abnormality that resulted in 50% displacement attenuation had a full width at half maximum of 5.4 ± .4 mm (mean ± SD). Graphs are presented showing the relationship between the size of an abnormality and the ability of the method to reconstruct that abnormality. The combination of high resolution parallel‐tagged MR images and the model‐free, coordinate system‐free strain reconstruction technique presented in this paper is capable of producing accurate, high resolution strain maps of the myocardium.