Encontrados 26 documentos, a visualizar página 1 de 3
Feasibility and accuracy of automated three-dimensional echocardiographic analy...
Morais, Pedro; Fan, Yiting; Queirós, Sandro Filipe Monteiro; D'hooge, Jan; Lee, Alex Pui-Wai; Vilaça, João LProcedural success of transcatheter left atrial appendage closure (LAAC) is dependent on correct device selection. Three-dimensional (3D) transesophageal echocardiography (TEE) is more accurate than the two-dimensional modality for evaluation of the complex anatomy of the left atrial appendage (LAA). However, 3D transesophageal echocardiographic analysis of the LAA is challenging and highly expertise dependent....
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.
Quality assurance of segmental strain values provided by commercial 2-D speckle...
Røsner, Assami; Alessandrini, Martino; Kjønås, Didrik; Mirea, Oana; Queirós, Sandro Filipe Monteiro; D'hooge, JanThe aim of this study was to determine the accuracy and reproducibility of vendor-specific regional strain values by echocardiography using in silico data. Synthetic 2-D ultrasound gray-scale images of the left ventricle (LV) were generated with knowledge of the longitudinal segmental strain values from the underlying electromechanical LV model. Four of five models mimicked transmural infarctions with systolic ...
Kidney segmentation in three-dimensional ultrasound images using a fast phase-b...
Torres, Helena R.; Queirós, Sandro Filipe Monteiro; Morais, Pedro André Gonçalves; Oliveira, Bruno; Fonseca, João Luís Gomes; Mota, PauloRenal ultrasound imaging is the primary imaging modality for the assessment of the kidney’s condition and is essential for diagnosis, treatment and surgical intervention planning, and follow-up. In this regard, kidney delineation in three-dimensional ultrasound images represents a relevant and challenging task in clinical practice. In this paper, a novel framework is proposed to accurately segment the kidney in...
Kidney Segmentation in Three-Dimensional Ultrasound Images using a Fast Phase-b...
Torres, Helena R.; Queirós, Sandro; Morais, Pedro; Oliveira, Bruno; Gomes-Fonseca, João; Mota, Paulo; Lima, Estevão; D'hooge, Jan; Fonseca, Jaime C.Renal ultrasound imaging is the primary imaging modality for the assessment of the kidney’s condition and is essential for diagnosis, treatment and surgical intervention planning, and follow-up. In this regard, kidney delineation in three-dimensional ultrasound images represents a relevant and challenging task in clinical practice. In this paper, a novel framework is proposed to accurately segment the kidney in...
Assessment of aortic valve tract dynamics using automatic tracking of 3D transe...
Queirós, Sandro; Morais, Pedro; Fehske, Wolfgang; Papachristidis, Alexandros; Voigt, Jens-Uwe; Fonseca, Jaime C.; D'hooge, Jan; Vilaça, João L.The assessment of aortic valve (AV) morphology is paramount for planning transcatheter AV implantation (TAVI). Nowadays, pre-TAVI sizing is routinely performed at one cardiac phase only, usually at mid-systole. Nonetheless, the AV is a dynamic structure that undergoes changes in size and shape throughout the cardiac cycle, which may be relevant for prosthesis selection. Thus, the aim of this study was to presen...
Semi-Automatic Estimation of Device Size for Left Atrial Appendage Occlusion in...
Morais, Pedro; Vilaça, João L.; Queirós, Sandro; De Meester, Pieter; Budts, Werner; R. S. Tavares, João M.; D'hooge, JanLeft atrial appendage (LAA) occlusion is used to reduce the risk of thromboembolism in patients with nonvalvular atrial fibrillation, by obstructing the LAA through a percutaneously delivered device. Nonetheless, correct device sizing is complex, requiring the manual estimation of different measurements in pre-/peri-procedural images, which is tedious, time-consuming and with high inter- and intra-observer vari...
Three-dimensional color Doppler ultrasound simulation to mimic paravalvular reg...
Queirós, Sandro Filipe Monteiro; Gao, Hang; De Santis, Gianluca; Papachristidis, Alexandros; Fonseca, Jaime C.; Vilaça, João L.; D'hooge, JanDespite its high success rate, transcatheter aortic valve implantation (TAVI) is still associated with numerous complications, among which paravalvular regurgitation (PVR, which has been associated to long-term outcome. Assessment of PVR remains challenging in clinical routine; it lacks a solid reference method and the clinically used echocardiographic-based parameters have numerous limitations. Moreover, the d...
Semi-automatic aortic valve tract segmentation in 3D cardiac magnetic resonance...
Queirós, Sandro Filipe Monteiro; Morais, Pedro André Gonçalves; Fonseca, Jaime C.; D'hooge, Jan; Vilaça, João L.Accurate preoperative sizing of the aortic annulus (AoA) is crucial to determine the best fitting prosthesis to be implanted during transcatheter aortic valve (AV) implantation (TAVI). Although multidetector row computed tomography is currently the standard imaging modality for such assessment, 3D cardiac magnetic resonance (CMR) is a feasible radiation-free alternative. However, automatic AV segmentation and s...
Assessment of aortic valve tract dynamics using automatic tracking of 3D transe...
Queirós, Sandro Filipe Monteiro; Morais, Pedro; Fehske, Wolfgang; Papachristidis, Alexandros; Voigt, Jens-Uwe; Fonseca, Jaime C.; D'hooge, JanThe assessment of aortic valve (AV) morphology is paramount for planning transcatheter AV implantation (TAVI). Nowadays, pre-TAVI sizing is routinely performed at one cardiac phase only, usually at mid-systole. Nonetheless, the AV is a dynamic structure that undergoes changes in size and shape throughout the cardiac cycle, which may be relevant for prosthesis selection. Thus, the aim of this study was to presen...