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Tesis sobre el tema "Vector flow imaging (VFI)"

Autor: Grafiati
Publicado: 10 de marzo de 2023

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1

Chan, Lok-sang, and 陳樂生. "Adaptive flow detector and estimator for ultrasound high frame rate vector flow imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47753043.

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Cardiovascular diseases is a leading cause of death worldwide and improvement of the corresponding screening tool is the best way to deal with this clinical problem. In this thesis we attempted to develop a framework of ultrasound high frame rate vector flow imaging (VFI) by emphasizing on the design of corresponding flow detector and flow estimator. We believe that the high temporal resolution and the complex blood flow visualization ability of high frame rate VFI enables it to be further developed as a reliable flow imaging modality for cardiological examination. In order to achieve
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2

Farrugia, N. "Vector-scalar imaging in combustion using PIV and LIF." Thesis, Cranfield University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309583.

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3

Lenge, Matteo. "Development and validation of innovative ultrasound flow imaging methods." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10036/document.

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L'échographie est largement utilisée pour l'imagerie du flux sanguin pour ses nombreux avantages tels que son inocuité, son cout réduit, sa facilité d'utilisation et ses performances. Cette thèse a pour objectif de proposer de nouvelles méthodes ultrasonores d'imagerie du flux sanguin. Après une étude bibliographique, plusieurs approches ont été étudiées en détail jusqu'à leur implémentation sur l'échographe de recherche ULA-OP développé au sein du laboratoire et ont été validées en laboratoire et en clinique. La transmission d'ondes planes a été proposée pour améliorer la technique d'imagerie
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4

Tsang, Kwok-hon, and 曾國瀚. "Design of an aperture-domain imaging method and signal acquisition hardware for ultrasound-based vector flow estimation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43572315.

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5

Tsang, Kwok-hon. "Design of an aperture-domain imaging method and signal acquisition hardware for ultrasound-based vector flow estimation." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43572315.

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6

Correia, Mafalda Filipa Rodrigues. "From 2D to 3D cardiovascular ultrafast ultrasound imaging : new insights in shear wave elastography and blood flow imaging." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC158.

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Ces travaux de thèse portent sur le développement de nouvelles modalités d’imagerie cardiovasculaire basé sur l’utilisation de l'imagerie ultrarapide 2D et 3D. Les modalités d’imagerie développées dans cette thèse appartiennent au domaine de de l’élastographie par onde de cisaillement et de l'imagerie Doppler des flux sanguins.Dans un premier temps, la technique de l’élastographie par onde de cisaillement du myocarde a été développée pour les applications cliniques. Une approche d'imagerie non-linéaire a été utilisée pour améliorer l’estimation de vitesse des ondes de cisaillement (ou la rigid
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7

Ramadoss, Balaji. "Vector Flow Model in Video Estimation and Effects of Network Congestion in Low Bit-Rate Compression Standards." [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000139.

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8

Bayat, Sharareh. "Direct Structured Finite Element Mesh Generation from Three-dimensional Medical Images of the Aorta." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31023.

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Three-dimensional (3-D) medical imaging creates notable opportunities as input toward engineering analyses, whether for basic understanding of the normal function or patho-physiology of an organ, or for the simulation of virtual surgical procedures. These analyses most often require finite element (FE) models to be constructed from patient-specific 3-D medical images. However, creation of such models can be extremely labor-intensive; in addition, image processing and mesh generation are often operator-dependent, lack robustness and may be of suboptimal quality. Focusing on the human aorta, t
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9

Rodríguez, Eduardo Rafael Llapa. "Segmentação de fronteiras em imagens médicas via contornos deformáveis através do fluxo recursivo do vetor gradiente." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-03022016-161317/.

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Devido à variação na qualidade e ao ruído nas imagens médicas, a aplicação de técnicas tradicionais de segmentação é geralmente ineficiente. Nesse sentido, apresenta-se um novo algoritmo a partir de duas técnicas: o modelo de contornos deformáveis por fluxo do vetor gradiente (GVF deformable contours) e a técnica de espaço de escalas utilizando o processo de difusão. Assim, foi realizada uma revisão bibliográfica dos modelos que trabalham com os contornos deformáveis, os quais foram classificados em modelos paramétricos e geométricos. Entre os modelos paramétricos foi escolhido o modelo de con
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10

Goudot, Guillaume. "Applications innovantes des ultrasons en pathologie vasculaire : utilisation de l'imagerie ultrarapide dans l'analyse de la rigidité artérielle et des ultrasons pulsés en thérapie Arterial stiffening assessed by ultrafast ultrasound imaging gives new insight into arterial phenotype of vascular Ehlers–Danlos mouse models Aortic wall elastic properties in case of bicuspid aortic valve Segmental aortic stiffness in bicuspid aortic valve patients compared to first-degree relatives Wall shear stress measurement by ultrafast vector flow imaging for atherosclerotic carotid stenosis Pulsed cavitational therapy using high-frequency ultrasound for the treatment of deep vein thrombosis in an in vitro model of human blood clot." Thesis, Sorbonne Paris Cité, 2018. https://wo.app.u-paris.fr/cgi-bin/WebObjects/TheseWeb.woa/wa/show?t=2215&f=13951.

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11

Giangrossi, Claudio. "Development and real-time implementation of novel 2-D and 3-D imaging techniques on a research scanner." Doctoral thesis, 2022. http://hdl.handle.net/2158/1272194.

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In the last decades, ultrasound imaging systems have become more and more popular thanks to their capability to investigate tissues in safe, cost effective, and non-invasive way. Their role in diagnostic imaging has become fundamental in several medical specialties, thanks also to the introduction of advanced echographic systems fostered by the efforts of several research laboratories around the world. Such efforts are more frequently based on the use of special research scanners, characterized by flexible hardware and programmable software and firmware. These features have been demonstrated i
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12

Dort, Sarah. "Vector flow mapping using plane wave ultrasound imaging." Thèse, 2013. http://hdl.handle.net/1866/10859.

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Les diagnostics cliniques des maladies cardio-vasculaires sont principalement effectués à l’aide d’échographies Doppler-couleur malgré ses restrictions : mesures de vélocité dépendantes de l’angle ainsi qu’une fréquence d’images plus faible à cause de focalisation traditionnelle. Deux études, utilisant des approches différentes, adressent ces restrictions en utilisant l’imagerie à onde-plane, post-traitée avec des méthodes de délai et sommation et d’autocorrélation. L’objectif de la présente étude est de ré-implémenté ces méthodes pour analyser certains paramètres qui affecte la précision des
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13

Chen, Tien-Hung, and 陳天鈜. "Vector Doppler Estimation and Speckle Tracking for Plane Wave Flow Imaging." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/tp5kzf.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>105<br>Use vector Doppler to estimate flow velocity is limited by vessel angle and maximum flow velocity in medical ultrasound system. In this study, we tried to overcome the influence of vessel angle by combining crossed-beam vector Doppler (VD) with speckle tracking (ST) in high frame rate plane wave imaging. In VD, we used radio frequency signals from different steered transmission angles to estimate autocorrelation separately, and used least-squares to obtain flow vector. Then we combined the axial velocity from VD (Vz-VD) with one-dimension speckle tracking (1-D
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14

Rossi, Stefano, and Piero Tortoli. "Development and validation of novel approaches for real-time ultrasound vector velocity measurements." Doctoral thesis, 2021. http://hdl.handle.net/2158/1239650.

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Ultrasound imaging techniques have become increasingly successful in the medical field as they provide relatively low cost and totally safe diagnosis. Doppler methods focus on blood flow for the diagnosis and follow-up of cardiovascular diseases. First Doppler methods only measured the axial component of the motion. More recently, advanced methods have solved this problem, by estimating two or even all three velocity components. In this context, high frame rate (HFR) imaging techniques, based on the transmission of plane waves (PW), lead to the reconstruction of 2-D and 3-D vector maps of bloo
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15

Ματσάκου, Αικατερίνη. "Αυτόματη ανίχνευση του αρτηριακού τοιχώματος της καρωτίδας από εικόνες υπερήχων β-σάρωσης". Thesis, 2011. http://nemertes.lis.upatras.gr/jspui/handle/10889/4537.

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Σε αυτή την εργασία παρουσιάζεται μια πλήρως αυτοματοποιημένη μεθοδολογία κατάτμησης για την ανίχνευση των ορίων του αρτηριακού τοιχώματος σε διαμήκεις εικόνες καρωτίδας β-σάρωσης. Συγκεκριμένα υλοποιείται ένας συνδυασμός της μεθοδολογίας του μετασχηματισμού Hough για την ανίχνευση ευθειών με μια μεθοδολογία ενεργών καμπυλών. Η μεθοδολογία του μετασχηματισμού Hough χρησιμοποιείται για τον ορισμό της αρχικής καμπύλης, η οποία στη συνέχεια παραμορφώνεται σύμφωνα με ένα μοντέλο ενεργών καμπυλών βασισμένων σε πεδίο ροής του διανύσματος κλίσης (Gradient Vector Flow - GVF). Το GVF μοντέλο ενεργών
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