In vivo comparison of three ultrasound vector velocity techniques to MR phase contrast angiography

Hansen, Kristoffer Lindskov; Udesen, Jesper; Oddershede, N.; Henze, L.; Thomsen, Carsten; Jensen, Jørgen Arendt; Nielsen, Michael Bachmann

doi:10.1016/j.ultras.2009.04.002

Cited by 39 publications

(38 citation statements)

References 48 publications

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“…Several studies have been realized with TO, examining the advantages and limitations of the method [6][7][8][9][10]. Furthermore, preliminary results have been published on cardiac flow using intraoperative TO [11,12].…”

Section: Introductionmentioning

confidence: 99%

Vector flow imaging of the ascending aorta

Hansen

Møller‐Sørensen

Kjærgaard

et al. 2015

2015 IEEE International Ultrasonics Symposium (IUS)

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Abstract-In the ascending aorta, atherosclerotic plaque formation, which is a risk factor for cerebrovascular events, most often occurs along the inner curvature. Atherosclerosis is a multifactorial disease, but the predilection site for the aortic vessel degradation is probably flow dependent. To better understand the aortic flow and especially the complex flow patterns, the ascending aorta was scanned intraoperatively in patients undergoing heart surgery using the angle-independent vector velocity ultrasound method Transverse Oscillation (TO). The primary aim of the study was to analyze systolic backflow in relation to atherosclerosis. Thirteen patients with normal aortic valves were included in to the study. TO implemented on a conventional US scanner (ProFocus 2202 UltraView, BK Medical, Herlev, Denmark) with a linear array transducer (8670, BK Medical, Herlev, Denmark) was used intraoperatively on the ascending aorta in long axis view. The presence of systolic backflow, visualized with TO, was correlated to aortic atherosclerosis, to systolic velocities obtained with transesophageal echocardiography and cardiac output obtained with pulmonary artery catheter thermodilution, to gender, age, aortic diameter, left ventricular ejection fraction (LVEF) and previous myocardial infarctions (MI). Systolic backflow in the ascending aorta was present for 38% (n=5) of the patients. The location of the backflow was strongly associated to the location of the plaques (p<0.005), and backflow was associated to high systolic velocities (p<0.05). The other obtained parameters were not associated to systolic backflow. It was shown that systolic backflow is a common flow feature in the ascending aorta, and that backflow is associated to atherosclerotic plaques and systolic velocities. The study indicates that vector flow imaging using TO can provide important blood flow information in the assessment of atherosclerosis.

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Section: Introductionmentioning

confidence: 99%

Vector flow imaging of the ascending aorta

Hansen

Møller‐Sørensen

Kjærgaard

et al. 2015

2015 IEEE International Ultrasonics Symposium (IUS)

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“…the carotid artery [44] and low velocity flow as indicated by Tanter et al [45] for plane wave emissions. A high f pr f and cross-correlation approaches or speckle tracking can find the high velocities.…”

Section: High Dynamic Range Flow Imagingmentioning

confidence: 88%

“…3. The first validation of SA flow was conducted by Hansen et al [44] where three vector flow methods were compared including SA directional flow imaging. Eight emissions were used for the flow sequences and phased contrast MRI was used as a reference when scanning the carotid artery.…”

Section: A Validation Of Sa Flow Imagingmentioning

confidence: 99%

Ultrasound Vector Flow Imaging—Part II: Parallel Systems

Jensen

Nikolov

et al. 2016

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

101

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Abstract-The paper gives a review of the current state-of-theart in ultrasound parallel acquisition systems for flow imaging using spherical and plane waves emissions. The imaging methods are explained along with the advantages of using these very fast and sensitive velocity estimators. These experimental systems are capable of acquiring thousands of images per second for fast moving flow as well as yielding estimates of low velocity flow. These emerging techniques allow vector flow systems to assess highly complex flow with transitory vortices and moving tissue, and they can also be used in functional ultrasound imaging for studying brain function in animals. The paper explains the underlying acquisition and estimation methods for fast 2-D and 3-D velocity imaging and gives a number of examples. Future challenges and the potentials of parallel acquisition systems for flow imaging are also discussed.

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“…As measurement error is an important component of interventional in vivo studies, the accuracy in flow imaging should be determined through validation studies, using either criterion standard methodology (e.g., magnetic resonance imaging [60]), or validated models with known hemodynamic properties (e.g., computational fluid dynamics simulations [61] and flow phantoms [62]). The specific decisions for constructing and validating flow phantoms have been previously reviewed [63], and should be considered prior to diverting resources to human studies.…”

Section: Validation Of Methods Prior To In Vivo Data Collectionmentioning

confidence: 99%

Riding the Plane Wave: Considerations for In Vivo Study Designs Employing High Frame Rate Ultrasound

Hughson

2018

Applied Sciences

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Advancements in diagnostic ultrasound have allowed for a rapid expansion of the quantity and quality of non-invasive information that clinical researchers can acquire from cardiovascular physiology. The recent emergence of high frame rate ultrasound (HiFRUS) is the next step in the quantification of complex blood flow behavior, offering angle-independent, high temporal resolution data in normal physiology and clinical cases. While there are various HiFRUS methods that have been tested and validated in simulations and in complex flow phantoms, there is a need to expand the field into more rigorous in vivo testing for clinical relevance. In this tutorial, we briefly outline the major advances in HiFRUS, and discuss practical considerations of participant preparation, experimental design, and human measurement, while also providing an example of how these frameworks can be immediately applied to in vivo research questions. The considerations put forward in this paper aim to set a realistic framework for research labs which use HiFRUS to commence the collection of human data for basic science, as well as for preliminary clinical research questions.

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In vivo comparison of three ultrasound vector velocity techniques to MR phase contrast angiography

Cited by 39 publications

References 48 publications

Vector flow imaging of the ascending aorta

Vector flow imaging of the ascending aorta

Ultrasound Vector Flow Imaging—Part II: Parallel Systems

Riding the Plane Wave: Considerations for In Vivo Study Designs Employing High Frame Rate Ultrasound

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