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It is thus affected by high deformations due to image decorrelation between frames.<\/jats:p><\/jats:sec><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To develop an ultrafast time\u2010ensemble regularized tissue\u2010Doppler optical\u2010flow principal strain estimator for aorta deformability assessment in a long\u2010axis view.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This approach alleviated the impact of lateral resolution using image compounding and that of the coordinate system dependency using principal strain. Accuracy and feasibility were evaluated in two aorta\u2010mimicking phantoms first, and then in four age\u2010matched individuals with either a normal aorta or a pathological ascending thoracic aorta aneurysm (TAA).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Instantaneous aortic maximum and minimum principal strain maps and regional accumulated strains during each cardiac cycle were estimated at systolic and diastolic phases to characterize the normal aorta and TAA. In vitro, principal strain results matched sonomicrometry measurements. In vivo, a significant decrease in maximum and minimum principal strains was observed in TAA cases, whose range was respectively 7.9\u00a0\u00b1\u00a06.4% and 8.2\u00a0\u00b1\u00a02.6% smaller than in normal aortas.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The proposed principal strain estimator showed an ability to potentially assess TAA deformability, which may provide an individualized and reliable evaluation method for TAA rupture risk assessment.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mp.15464","type":"journal-article","created":{"date-parts":[[2022,1,19]],"date-time":"2022-01-19T17:54:06Z","timestamp":1642614846000},"page":"1759-1775","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Deformability of ascending thoracic aorta aneurysms assessed using ultrafast ultrasound and a principal strain estimator: In vitro evaluation and in vivo feasibility"],"prefix":"10.1002","volume":"49","author":[{"given":"Diya","family":"Wang","sequence":"first","affiliation":[{"name":"School of Life Science and Technology Xi'an Jiaotong University Xi'an China"},{"name":"Laboratory of Biorheology and Medical Ultrasonics, Research Center University of Montreal Hospital Montreal QC Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Boris","family":"Chayer","sequence":"additional","affiliation":[{"name":"Laboratory of Biorheology and Medical Ultrasonics, Research Center University of Montreal Hospital Montreal QC Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fran\u00e7ois","family":"Destrempes","sequence":"additional","affiliation":[{"name":"Laboratory of Biorheology and Medical Ultrasonics, Research Center University of Montreal Hospital Montreal QC Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marc","family":"Gesnik","sequence":"additional","affiliation":[{"name":"Laboratory of Biorheology and Medical Ultrasonics, Research Center University of Montreal Hospital Montreal QC Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fran\u00e7ois","family":"Tournoux","sequence":"additional","affiliation":[{"name":"Laboratory of Biorheology and Medical Ultrasonics, Research Center University of Montreal Hospital Montreal QC Canada"},{"name":"Department of Cardiology, Echocardiography Laboratory University of Montreal Hospital Montreal QC Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guy","family":"Cloutier","sequence":"additional","affiliation":[{"name":"Laboratory of Biorheology and Medical Ultrasonics, Research Center University of Montreal Hospital Montreal QC Canada"},{"name":"Department of Radiology, Radio\u2010Oncology and Nuclear Medicine, and Institute of Biomedical Engineering University of Montreal Montreal QC Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,1,28]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1161\/CIRCULATIONAHA.108.817619"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1148\/radiol.2016151407"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejvs.2010.09.011"},{"key":"e_1_2_11_5_1","unstructured":"Centers for Disease Control and Prevention National Center for Health Statistics. 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