• 3-D Doppler imaging in cardiac applications using high frame-rate sequences 

      Fiorentini, Stefano (Doctoral theses at NTNU;2020:60, Doctoral thesis, 2020)
      Several decades after the establishment of Doppler ultrasound, quantification and imaging of blood flow using Doppler-based techniques continue to face multiple challenges. Out-of-plane flow, transit-time broadening and ...
    • 3D Speckle-Tracking: Sub-voxel Techniques and Tracking Accuracy 

      Bostad, Ingvild Haraldsen (Master thesis, 2006)
      Speckle tracking is a method that is useful for examining myocardial function. The method allows the cardiologist examine the left ventricular wall function when there are indications of a myocardial infarction. The method ...
    • 3D Ultrasound for Quantitative Echocardiography 

      Hergum, Torbjørn (Doctoral Theses at NTNU, 1503-8181; 2009:135, Doctoral thesis, 2009)
      Medical ultrasound imaging is widely used to diagnose cardiacdiseases. The recent availability of real time 3D ultrasound posesseveral interesting challenges and opportunities, and the work of thisthesis is devoted to both ...
    • 3D visualisering av lekkasje i hjerteklaff 

      Horne, Øyvind (Master thesis, 2006)
      For å kunne gjøre en god gradering av en mitralinsuffisiens er det viktig med en nøyaktig presentasjon av tilbakestrømningen i fargedoppler. Presentasjon av data må også gjøres kjapt for å kunne holde følge med hjertets ...
    • 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 ...
    • A computational pipeline for quantification of mouse myocardial stiffness parameters 

      Nordbø, Øyvind; Lamata, P.; Land, Sander; Niederer, Steven A.; Aronsen, Jan Magnus; Louch, William Edward; Sjaastad, Ivar; Martens, Harald; Gjuvsland, Arne Bjørke; Tøndel, Kristin; Torp, Hans; Lohezic, M; Schneider, Jürgen; Remme, Espen W.; Smith, Nicolas P; Omholt, Stig W; Vik, Jon Olav (Journal article; Peer reviewed, 2014)
      The mouse is an important model for theoretical–experimental cardiac research, and biophysically based whole organ models of the mouse heart are now within reach. However, the passive material properties of mouse myocardium ...
    • A framework for the simulation and validation of acoustic fields from medical ultrasound transducers 

      Bakstad, Ole (Master thesis, 2012)
      The unified simulation framework for medical ultrasound, FieldSim, cur- rently supports linear and non-linear simulations by using Field II and Aber- sim, respectively. In this thesis the quasi-linear simulation tool, ...
    • A K-Space Filtering Technique for Vibration Sonoelastography 

      Henninen, Mikkel Øyvind (Master thesis, 2016)
      The aim of this project was to investigate the feasibility of a k-space filtration technique to produce elasticity maps with stationary vibration fields. The method was implemented in a MATLAB routine and tested against ...
    • A System for the Acquisition and Analysis of Invasive and Non-invasive Measurements used to quantify Cardiovascular Performance 

      Omejer, Ole Øvergaard (Master thesis, 2011)
      Invasive measurements of cardiac functioning allows for more accurate measures of cardiac functioning than non-invasive measurements. However, invasive measurements is often not available in clinical settings. By comparing ...
    • Affine Alignment of Ultrasound Volumes Using Deep Learning 

      Johannessen, Anders (Master thesis, 2019)
      Denne masteroppgaven utforsker mulighetene for dyp læringsbasert bilderegistrering av 3D ultralyd volumer. To modeller for affin transformasjon av et bevegelig bilde og i referanse til et fast bilde blir sammenlignet. Den ...
    • Automatic Extraction of Doppler Parameters for the Assessment of Fetal and Maternal Health 

      Heyer, Agnes Margrethe (Master thesis, 2014)
      In developing countries, the availability of personnel with training in the use of ultrasound devices and the availability of conventional ultrasound equipment may be very limited. It is therefore beneficial to automate ...
    • Automatic Intima-Lumen detection in Cardiovascular Ultrasound. 

      Edvardsen, Kristin Holm (Master thesis, 2006)
      The main goal in this thesis has been to develop an algorithm that robustly identifies the Carotid artery wall boundaries throughout a heart cycle in an ultrasound image. An existing automatic vessel detection algorithm ...
    • Automatic measurements of mitral annular motion indices 

      Grue, Jahn Frederik Noraas (Doctoral theses at NTNU;2020:4, Doctoral thesis, 2020)
    • Automatic measurements of mitral annular plane systolic excursion and velocities to detect left ventricular dysfunction 

      Grue, Jahn Frederik; Storve, Sigurd; Dalen, Håvard; Salvesen, Øyvind; Mjølstad, Ole Christian; Samstad, Stein; Torp, Hans; Haugen, Bjørn Olav (Journal article; Peer reviewed, 2018)
      The purpose of the study described here was to evaluate an automatic algorithm for detection of left ventricular dysfunction, based on measurements of mitral annular motion indices from color tissue Doppler apical four-chamber ...
    • Automatic quantification of left ventricular function by medical students using ultrasound 

      Grue, Jahn Frederik; Storve, Sigurd; Dalen, Håvard; Mjølstad, Ole Christian; Samstad, Stein; Eriksen-Volnes, Torfinn; Torp, Hans; Haugen, Bjørn Olav (Peer reviewed; Journal article, 2020)
      Background Automatic analyses of echocardiograms may support inexperienced users in quantifying left ventricular (LV) function. We have developed an algorithm for fully automatic measurements of mitral annular plane ...
    • Blood flow calculated in the uterine arteries based on the PixelFlux technique 

      Andersen, Thea Anett; Arneberg, Helene Caroline (Master thesis, 2017)
      Introduction: We aimed to compare two Doppler methods which calculate blood flow in the uterine arteries. We also aimed to explore associations between blood flow with birthweight and with fetal weight-gain/day from ...
    • Cerebral Hemodynamics in Normal Neonates During Tilt: Computer Modelling and Experiments 

      Jarmund, Anders Hagen (Master thesis, 2019)
      Nyfødte barn er sårbare for å få forstyrret blodstrømmen i hjernen. I verste fall kan forstyrrelsen føre til hjerneskader og ende med død eller livsvarige funksjonsnedsettelser. Et ultralyd-system kalt NeoDoppler har nylig ...
    • Clutter Filter Wave Imaging 

      Salles, Sebastien; Løvstakken, Lasse; Aase, Svein Arne; Bjåstad, Tore Grüner; Torp, Hans (Journal article; Peer reviewed, 2019)
      The elastic properties of human tissue can be evaluated through the study of mechanical wave propagation captured using high frame rate ultrasound imaging. Methods such as block-matching or phase-based motion estimation ...
    • Coded Excitation in Color Flow Imaging 

      Holje, Jostein (Master thesis, 2007)
    • Combined 2-D Vector imaging and Tracking Doppler for improved vascular blood velocity quantification 

      Avdal, Jørgen; Løvstakken, Lasse; Torp, Hans; Ekroll, Ingvild Kinn (Journal article; Peer reviewed, 2017)
      Measurement of the maximum blood flow velocity is the primary means for determining the degree of carotid stenosis using ultrasound. The current standard for estimating the maximum velocity is Pulsed Wave (PW) Doppler with ...