2026-05-05T18:32:17Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/151562025-03-26T16:41:30Zcom_10324_1191com_10324_931com_10324_894col_10324_1379

Cordero Grande, Lucilio Royuela del Val, Javier Sanz Estébanez, Santiago Rodrigo Martín Fernández, Marcos Antonio Alberola López, Carlos 2015-12-21T11:25:58Z 2015-12-21T11:25:58Z 2015 Medical Image Analysis (en prensa) http://uvadoc.uva.es/handle/10324/15156 10.1016/j.media.2015.12.001 The purpose of this work is to develop a method for direct estimation of the cardiac strain tensor by extending the harmonic phase reconstruction on tagged magnetic resonance images to obtain more precise and robust measurements. The extension relies on the reconstruction of the local phase of the image by means of the windowed Fourier transform and the acquisition of an overdetermined set of stripe orientations in order to avoid the phase interferences from structures outside the myocardium and the instabilities arising from the application of a gradient operator. Results have shown that increasing the number of acquired orientations provides a signi cant improvement in the reproducibility of the strain measurements and that the acquisition of an extended set of orientations also improves the reproducibility when compared with acquiring repeated samples from a smaller set of orientations. Additionally, biases in local phase estimation when using the original harmonic phase formulation are greatly diminished by the one here proposed. The ideas here presented allow the design of new methods for motion sensitive magnetic resonance imaging, which could simultaneously improve the resolution, robustness and accuracy of motion estimates. application/pdf spa info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 International Tagged Magnetic Resonance Imaging Harmonic Phase Reconstruction Artifacts Strain Tensor Windowed Fourier Transform Multi-Oriented Windowed Harmonic Phase Reconstruction for Robust Cardiac Strain Imaging info:eu-repo/semantics/article SI