3 documents found, page 1 of 1
The impact of vendor-specific ultrasound beam-forming and processing techniques...
Papachristidis, Alexandros; Queirós, Sandro Filipe Monteiro; Theodoropoulos, Konstantinos C; D'hooge, Jan; Rafter, Patrick; Masoero, GiovanniMyocardial scar appears brighter compared with normal myocardium on echocardiography because of differences in tissue characteristics. The aim of this study was to test how different ultrasound pulse characteristics affect the brightness contrast (i.e., contrast ratio [CR]) between tissues of different acoustic properties, as well as the accuracy of assessing tissue volume.
Fully Automatic 3D-TEE Segmentation for the Planning of Transcatheter Aortic Va...
Queirós, Sandro Filipe Monteiro; Papachristidis, Alexandros; Morais, Pedro André Gonçalves; Theodoropoulos, Konstantinos C.; Fonseca, Jaime C.A novel fully automatic framework for aortic valve (AV) trunk segmentation in three-dimensional (3-D) transesophageal echocardiography (TEE) datasets is proposed. The methodology combines a previously presented semiautomatic segmentation strategy by using shape-based B-spline Explicit Active Surfaces with two novel algorithms to automate the quantification of relevant AV measures. The first combines a fast rota...
Aortic valve tract segmentation from 3D-TEE using shape-based B-spline explicit...
Queirós, Sandro Filipe Monteiro; Papachristidis, Alexandros; Barbosa, Daniel Joaquim Cunha; Theodoropoulos, Konstantinos C.; Fonseca, Jaime C.A novel semi-automatic algorithm for aortic valve (AV) wall segmentation is presented for 3D transesophageal echocardiography (TEE) datasets. The proposed methodology uses a 3D cylindrical formulation of the B-spline Explicit Active Surfaces (BEAS) framework in a dual-stage energy evolution process, comprising a threshold-based and a localized region-based stage. Hereto, intensity and shape-based features are c...