Articles Related to Flow Visualization

W Conlin, P Yu, V Durgesh - Bulletin of the American Physical Society, 2017

...The objective of this study is to identify the large-scale structures in the aneurysm, study temporal behavior, and quantify their interaction with the inflow condition. ... ... For this purpose, detailed Particle Image Velocimetry (PIV) measurements were performed at the center plane of an idealized aneurysm model for a range of inflow conditions. Inflow conditions were precisely controlled using a ViVitro SuperPump system. ...

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P Yu, V Durgesh, H Johari - Bulletin of the American Physical Society, 2017

...Studies have shown that hemodynamics is integral to developing an understanding of aneurysm formation, growth, and rupture. This investigation focuses on a comprehensive study of the impact of varying inflow conditions and aneurysm shapes on spatial and temporal behavior of flow parameters and structures in an aneurysm.... ... For this purpose, detailed Particle Image Velocimetry (PIV) measurements were performed at the center plane of an idealized aneurysm model for a range of inflow conditions. Inflow conditions were precisely controlled using a ViVitro SuperPump system. ...

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M. Alizadeh, M. Cote, and A Branzan Albu P Sharma, FM Bianchi - Image Analysis 20th Scandinavian Conference, SCIA 2017,

...The valve orifi ce area over time, which informs on the opening and closing motion patterns, constitutes a key quality metric for PHV assessment... ...In this paper, we propose a novel orifi ce segmentation approach for automatic prosthetic heart valves quantitative performance analysis, based on the detection of the leaflet free edges to accurately extract the actual orifi ce area.

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Riccardo Toninatoa, Jacob Salmona, Francesca Maria Susin, Andrea Duccia, Gaetano Burriescia doi:10.1016/j.jbiomech.2016.05.027

The physiological flow dynamics within the Valsalva sinuses, in terms of global and local parameters, are still not fully understood. This study attempts to identify the physiological conditions as closely as possible, and to give an explanation of the different and sometime contradictory results in literature. ... 2. Material and Methods. In this study, all experiments were carried out using a hydro-mechanical pulse duplicator (Vivitro Superpump System SP3891, ViVitro Labs Inc., Canada), with pressure catheters monitoring the pressure upstream and downstream of the aortic valve. ...

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Jahren, Silje Ekroll; Heinisch, Paul Philipp; Wirz, Jessica; Winkler, Bernhard; Carrel, Thierry; Obrist, Dominik (31 March 2015). Hemodynamic Performance of Edwards Intuity Valve in a Compliant Aortic Root Model (In Press). In: IEEE EMBC 2015. Milano. 25.08.-29.08.2015.

...It was the aim of this study to perform hemodynamic and kinematic measurements for this type of valves to serve as a baseline for following studies which investigate the effect of the aortic root on the valve performance. To this end, the Edwards Intuity aortic valve was investigated in a new in vitro flow loop mimicking the left heart...

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Bernhard Vennemann, David Hasler, Silje E. Jahren, Thomas Rösgen, Thierry P. Carrel, Dominik Obrist - Heart Valve Society 1st Annual Meeting MAY 6-9, MONTE CARLO, MONACO, GRIMALDI FORUM

...so called hot spots, where activated platelets might aggregate and form a thrombus that can ultimately lead to leaflet blockage. It is the aim of this study to assess the hemodynamics in the pivoting area of the Triflo valve.

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Ikechukwu U. Okafor, Arvind Santhanakrishnan, Brandon D. Chaffins, Lucia Mirabella, John N. Oshinski and Ajit P. Yoganathan - Journal of Cardiovascular Magnetic Resonance 2015, 17:51 doi:10.1186/s12968-015-0154-9

... A programmable piston pump (PPP; Vivitro Systems Inc., Victoria, Canada) was used to induce the LV wall motion by altering the pressure of the fluid in the space between the interior of acrylic chamber housing the LV model and the exterior of the LV model. ...

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Clara Seaman, Andrew McNally, Stephen Biddle, Lauren Jankowski, Philippe Sucosky Presented in part at the 2013 Biomedical Engineering Society Conference, September 2013, Seattle, WA, and at the 2013 ASME Summer Bioengineering Conference, June 2013, Sunriver, OR, USA

The study aim was to develop a laboratory protocol for the fabrication of tissue valve models mimicking mild and moderate calcific stenosis, for future use in flow studies. ... near-physiologic hemodynamics. The flow loop was driven by a programmable piston pump (Vivitro), and included resistance and compliance units to mimic the characteristics of the systemic vascular tree (Fig. 3A). The system ...

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A Falahatpisheh, G Pedrizzetti, A Kheradvar; Experiments in Fluids November 2014, 55:1848

... We used a heart-flow simulator consisting of a hydraulic pump system (Superpump system, VSI, SPS3891, Vivitro systems Inc., Victoria, BC, Canada) that operates based on a VSI Wave Generator VG2001 (Vivitro Systems Incorporated, Victoria, BC, Canada), as previously ...

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W.Lim; Journal of Biomechanics: 34, Issue 11; 1417-1427.

A two-dimensional particle image tracking velocimetry (PIV) system has been used to map the velocity vector fields and Reynolds stresses in the immediate downstream vicinity of a porcine bioprosthetic heart valve at the aortic root region in vitro under pulsatile flow conditions. Measurements were performed at five different time steps...

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