Intra-Operative Vector Flow Imaging Using Ultrasound of the Ascending Aorta among 40 Patients with Normal, Stenotic and Replaced Aortic Valves

Hansen, Kristoffer Lindskov; Møller‐Sørensen, Hasse; Kjærgaard, Jesper; Jensen, Mads Christian; Lund, J. W.; Pedersen, Michael Ingemann; Lange, Theis; Jensen, Jørgen Arendt; Nielsen, Michael Bachmann

doi:10.1016/j.ultrasmedbio.2016.06.009

Cited by 31 publications

(57 citation statements)

References 38 publications

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“…Various advantages of VFI have been reported including precise peak velocity measurements, volume flow measurements and quantification of complex blood flow (Hansen et al 2014(Hansen et al , 2015a(Hansen et al , 2016Fig. 4.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to venous disorders, VFI could also play a role in examination of the carotid and femoral arteries, in cardiology and in abdominal ultrasound, all areas recently examined with VFI (Brandt et al 2015;Hansen et al 2015bHansen et al , 2016Hansen et al , 2017bPedersen et al 2012). The vessels in the thorax and abdomen are deeply located and examined with phased and convex arrays respectively, which means that electronic beam-to-flow angle correction may be limited, and valid velocity estimates may be difficult to attain with SDUS.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, VFI-derived measures such as velocity ratios and vector concentration could also be used to characterize venous flow patterns, and both measures are unaffected by underestimation of the actual velocity (Hansen et al 2015b(Hansen et al , 2016(Hansen et al , 2017b. The vector concentration has been used to characterize aortic valve stenosis, indicating a strong association with peak systolic velocity (Hansen et al 2016(Hansen et al , 2017b. The velocity ratio obtained with VFI for assessment of stenosis has been tested in the superficial femoral artery, and correlated well with digital subtraction angiography (Hansen et al 2015b).…”

Section: Discussionmentioning

confidence: 99%

“…The first article describing venous blood flow imaging using vector velocity estimation achieved with plane wave emission revealed highly complex flow patterns around the cusps of the valve in the jugular vein (Hansen et al 2009). Flow complexity, that is, vector concentration, should in future studies be applied to venous flow, for example, around venous valves, to relate venous blood flow complexity and venous disease (Hansen et al 2016). Future research will determine if the quantitative characterization of complex alterations in the flow, as well as angle-independent peak velocity estimations, achievable with VFI, can be of value in evaluation of patients with venous disease of the lower extremities.…”

Section: Discussionmentioning

confidence: 99%

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Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein

Bechsgaard

Hansen

Brandt

et al. 2017

Ultrasound in Medicine & Biology

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Ultrasound is used for evaluating the veins of the lower extremities. Operator and angle dependency limit spectral Doppler ultrasound (SDUS). The aim of the study was to compare peak velocity measurements in a flow phantom and the femoropopliteal vein of 20 volunteers with the angle-independent vector velocity technique vector flow imaging (VFI) and SDUS. In the flow phantom, VFI underestimated velocity (p = 0.01), with a lower accuracy of 5.5% (p = 0.01) and with no difference in precision, that is, error factor, compared with SDUS (VFI: 1.02 vs. SDUS: 1.02, p = 0.58). In vivo, VFI estimated lower velocities (femoral: p = 0.001; popliteal: p = 0.001) with no difference in precision compared with SDUS (femoral: VFI 1.09 vs. SDUS 1.14, p = 0.37; popliteal: VFI 1.13 vs. SDUS 1.06, p = 0.09). In conclusion, the precise VFI technique can be used to characterize venous hemodynamics of the lower extremities despite its underestimation of velocities.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein

Bechsgaard

Hansen

Brandt

et al. 2017

Ultrasound in Medicine & Biology

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“…55,61 Furthermore, ventricular filling is studied using four-dimensional flow MRI. 16 Ultrasound-based vector flow imaging and echoPIV are used to study flow in the ascending aorta, 22 the abdominal aorta, 17,63 and to study ventricular blood flow. 27,32 The latter is also reported in combination with optical PIV flow studies.…”

Section: Strengths and Limitations Of This Reviewmentioning

confidence: 99%

A Systematic Review for the Design of In Vitro Flow Studies of the Carotid Artery Bifurcation

Hoving

Vries

Mikhal

et al. 2019

Cardiovasc Eng Tech

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Associate Editor Patrick Segers oversaw the review of this article. AbstractPurpose-In vitro blood flow studies in carotid artery bifurcation models may contribute to understanding the influence of hemodynamics on carotid artery disease. However, the design of in vitro blood flow studies involves many steps and selection of imaging techniques, model materials, model design, and flow visualization parameters. Therefore, an overview of the possibilities and guidance for the design process is beneficial for researchers with less experience in flow studies. Methods-A systematic search to in vitro flow studies in carotid artery bifurcation models aiming at quantification and detailed flow visualization of blood flow dynamics results in inclusion of 42 articles. Results-Four categories of imaging techniques are distinguished: MRI, optical particle image velocimetry (PIV), ultrasound and miscellaneous techniques. Parameters for flow visualization are categorized into velocity, flow, shearrelated, turbulent/disordered flow and other parameters. Model materials and design characteristics vary between study type. Conclusions-A simplified three-step design process is proposed for better fitting and adequate match with the pertinent research question at hand and as guidance for less experienced flow study researchers. The three consecutive selection steps are: flow parameters, image modality, and model materials and designs. Model materials depend on the chosen imaging technique, whereas choice of flow parameters is independent from imaging technique and is therefore only determined by the goal of the study. Comparative study of magnetic resonance imaging and image-based computational fluid dynamics for quantification of pulsatile flow in a carotid bifurcation phantom. Ann. Biomed. Eng. 31(8):962-971, 2003.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.BIOMEDICAL ENGINEERING SOCIETY

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Intra-Operative Vector Flow Imaging Using Ultrasound of the Ascending Aorta among 40 Patients with Normal, Stenotic and Replaced Aortic Valves

Cited by 31 publications

References 38 publications

Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein

Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein

A Systematic Review for the Design of In Vitro Flow Studies of the Carotid Artery Bifurcation

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