Blar i NTNU Open på forfatter "Grønli, Thomas"
-
A fast 4D B-spline framework for model-based reconstruction and regularization in vector flow imaging
Grønli, Thomas; Wigen, Morten Smedsrud; Segers, Patrick; Løvstakken, Lasse (Journal article; Peer reviewed, 2018)A generic framework for model-based regularization and reconstruction is described, with applications in a wide range of noisy measurement scenarios. The framework employs automatic differentiation and stochastic gradient ... -
Comparison of ultrasound vector flow imaging and CFD simulations with PIV measurements of flow in a left ventricular outflow trackt phantom - Implications for clinical use and in silico studies
Leinan, Paul Roger; Grønli, Thomas; Skjetne, Paal; Wigen, Morten Smedsrud; Urheim, Stig; Løvstakken, Lasse; Dahl, Sigrid Kaarstad (Peer reviewed; Journal article, 2022)In this study we have compared two modalities for flow quantification from measurement data; ultrasound (US) and shadow particle image velocimetry (PIV), and a flow simulation model using computational fluid dynamics (CFD). ... -
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 ... -
Modeling and data assimilation for improved ultrasound measurement of blood velocity fields
Grønli, Thomas (Master thesis, 2017)Cardiovascular disease is the leading cause of death worldwide, and echocardiography stands as a fundamental tool in assessing congenital or developed heart failure. A cornerstone of echocardiography is the ability to ... -
Optimization of Ultrasound Signal and Image Processing Using the Tensorflow Framework
Babar, Abdullah Zahir (Master thesis, 2021)Ultralyd er et av de mest brukte avbildnings-systemene som brukes innenfor det medisinske feltet. Det er et ikke-invasivt og allsidig diagnostisk verktøy som går igjennom flere prosesseringstrinn før det omdanner et bilde ... -
Rekonstruksjon av ultralyd blodhastighetsfelter basert på Dyp Læring
Wifstad, Sigurd Vangen (Master thesis, 2020)Ny forskning viser at avvik fra normal blodstrøm i venstre ventrikkel kan være et tidlig tegn på hjertesykdom. Nøyaktig screening av blodstrøm i venstre ventrikkel kan hjelpe leger å gi passende behandling til pasienter ... -
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). ...