Browsing NTNU Open by Author "Fadnes, Solveig"
Now showing items 1-13 of 13
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4D ultrasound vector flow imaging for intraventricular flow assessment
Wigen, Morten Smedsrud (Doctoral theses at NTNU;2019:38, Doctoral thesis, 2019)4D ultralyd vector flow avbildning for evaluering av blodstrøm i hjertet Ultralyd er den mest utbredte modaliteten for evaluering av hjertefunksjon grunnet tilgjengelighet, lav kostnad og sanntidsvisning. Ekkokardiografi ... -
Adaptive Clutter Filtering for Improved Measurement of Cardiac Blood Velocities
Vågsholm, Beate Haram (Master thesis, 2017)In ultrasound color flow images of the heart, irregular blood flow patterns might be an early indication of heart disease. The blood flow is possible to image using multi-dimensional blood velocity estimation like speckle ... -
Adaptive speckle tracking algorithms for improved ultrasound blood flow imaging
Drange, Linn Siri (Master thesis, 2013)This thesis will present several ways to further improve the robustness of the speckle tracking method. The speckle tracking algorithm was made more adaptive to the velocity changes over time, utilizing velocity estimates ... -
Assessment of Early Diastolic Intraventricular Pressure Difference in Children by Blood Speckle-Tracking Echocardiography
Sørensen, Kristian; Fadnes, Solveig; Mertens, Luc; Henry, Matthew; Segers, Patrick; Løvstakken, Lasse; Nyrnes, Siri Ann (Peer reviewed; Journal article, 2023)Background: The lack of reliable echocardiographic techniques to assess diastolic function in children is a major clinical limitation. Our aim was to develop and validate the intraventricular pressure difference (IVPD) ... -
Blood Speckle-Tracking Based on High–Frame Rate Ultrasound Imaging in Pediatric Cardiology
Nyrnes, Siri Ann; Fadnes, Solveig; Wigen, Morten Smedsrud; Mertens, Luc; Løvstakken, Lasse (Peer reviewed; Journal article, 2020)Background: Flow properties play an important role in cardiac function, remodeling, and morphogenesis but cannot be displayed in detail with today’s echocardiographic techniques. The authors hypothesized that blood ... -
Detailed flow visualization in fetal and neonatal hearts using 2-D speckle tracking
Fadnes, Solveig; Nyrnes, Siri Ann; Wigen, Morten Smedsrud; Tegnander, Eva; Løvstakken, Lasse (Journal article, 2016)Two-dimensional blood speckle tracking has shown promise for measuring the complex flow patterns in neonatal hearts when based on linear array and high-frame-rate plane wave imaging. For phased array pediatric imaging, ... -
Improved Ultrasound Blood Flow Imaging Using Model-based Regularisation
Nysted, Siri Stueland (Master thesis, 2022)Denne oppgaven består av to deler. Den første delen er en parametertest av et regulariseringsoppsett som kombinerer en fluidmekanisk modell med støyete blodhastighetsmålinger interpolert på et b-spline grid. Nøyaktigheten ... -
In vivo intracardiac vector flow imaging using phased array transducers for pediatric cardiology
Fadnes, Solveig; Wigen, Morten Smedsrud; Nyrnes, Siri Ann; Løvstakken, Lasse (Journal article; Peer reviewed, 2017)Two-dimensional blood speckle tracking (ST) has shown promise for measuring complex flow patterns in neonatal hearts using linear arrays and high-frame-rate plane wave imaging. For general pediatric applications, however, ... -
Intraventricular Vector Flow Imaging with Blood Speckle Tracking in Adults: Feasibility, Normal Physiology and Mechanisms in Healthy Volunteers
Daae, Annichen Søyland; Wigen, Morten Smedsrud; Fadnes, Solveig; Løvstakken, Lasse; Støylen, Asbjørn (Peer reviewed; Journal article, 2021)This study examines the feasibility of blood speckle tracking for vector flow imaging in healthy adults and describes the physiologic flow pattern and vortex formation in relation to the wall motion in the left ventricle. ... -
Pulmonary Hypertension in Children is associated with Abnormal Flow patterns in the Main Pulmonary Artery as demonstrated by Blood Speckle Tracking
Mawad, Wadi; Fadnes, Solveig; Løvstakken, Lasse; Henry, Matthew; Mertens, Luc; Nyrnes, Siri Ann (Journal article; Peer reviewed, 2022)Background Paediatric pulmonary arterial hypertension (PAH) is characterized by increased pulmonary vascular resistance resulting in increased pulmonary artery (PA) and right ventricular pressure (RV). This is associated ... -
Right ventricular energetics using blood speckle tracking in pediatric congenital heart disease
Mawad, Wadi (Doctoral theses at NTNU;2024:190, Doctoral thesis, 2024)This thesis is composed of three studies of right ventricular (RV) energetics in pediatric patients with congenital heart disease (CHD), using blood speckle tracking (BST). The objectives were to describe the RV energetics ... -
Right Ventricular Flow Dynamics in Dilated Right Ventricles: Energy Loss Estimation Based on Blood Speckle Tracking Echocardiography-A Pilot Study in Children
Mawad, Wadi; Løvstakken, Lasse; Fadnes, Solveig; Grønli, Thomas; Segers, Patrick; Mertens, Luc; Nyrnes, Siri Ann (Peer reviewed; Journal article, 2021)Using blood speckle tracking (BST) based on high-frame-rate echocardiography (HFRE), we compared right ventricle (RV) flow dynamics in children with atrial septal defects (ASDs) and repaired tetralogy of Fallot (rTOF). ... -
Two-Dimensional Blood Velocity Estimation for Intracardiac Flow Assessment
Fadnes, Solveig (Doktoravhandlinger ved NTNU, 1503-8181; 2014:260, Doctoral thesis, 2014)Måling av blodstrømshastigheter i hjertet Ultralyd (ekkokardiografi) og fargedoppler er viktige verktøy som brukes for å detektere og visualisere medfødt hjertefeil. To av de mest vanlige formene for medfødt hjertefeil ...