Browsing NTNU Open by Author "Torp, Hans"
Now showing items 1-20 of 62
-
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 Myocardial Mechanical Wave Measurements: Toward In Vivo 3D Myocardial Elasticity Mapping
Salles, Sebastien; Espeland, Torvald; Rodriguez-Molares, Alfonso; Aase, Svein Arne; Hammer, Tommy; Støylen, Asbjørn; Aakhus, Svend; Løvstakken, Lasse; Torp, Hans (Peer reviewed; Journal article, 2020)Objectives This study aimed to investigate the potential of a novel 3-dimensional (3D) mechanical wave velocity mapping technique, based on the natural mechanical waves produced by the heart itself, to approach a noninvasive ... -
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 ... -
Automated Segmental Cardiac Monitoring by Advanced Computerized Artificial Intelligence on Intra-Operative Three-Dimensional Ultrasound Recordings
Taskén, Anders Austlid (Master thesis, 2021)Medisinsk ultralyd er et effektivt verktøy for å hente ut data fra menneskekroppens indre og praktiseres ofte i kirurgien for å vurdere hjertefunksjon. Perioperativ hjerteovervåking er viktig for diagnostikk tidlig i ... -
Automatic Detection and Measurement of Fetal Biparietal Diameter and Femur Length — Feasibility on a Portable Ultrasound Device
Khan, Naiad Hossain; Tegnander, Eva; Dreier, Johan Morten; Eik-Nes, Sturla; Torp, Hans; Kiss, Gabriel (Journal article, 2017)An automatic method able to recognize a presented section through the biparietal plane of the fetal head and a section through the fetal femur in ultrasound images is developed. Once the correct anatomical section for ... -
Automatic Detection of Air Emboli in The Cerebral Circulation in Newborns By Ultrasound Doppler Technique
Lam, My Tam (Master thesis, 2022)Når spedbarn er født med hjertesvikt eller en annen form for defekt i hjertet kan det være nødvendig med kateterintervensjon eller hjertekirurgi. Slike inngrep kan føre til at luftbobler blir introdusert inn i blodstrømmen. ... -
Automatic Detection of Embolic Signals in Doppler M-Mode Images Using Deep Learning
Grimstad, Bror Arild (Master thesis, 2024)Denne masteravhandlingen undersøker bruken av konvolusjonelle nevrale nettverk (CNN) til bruk i deteksjon av emboliske signal i "Signal Power"-bilder fremstilt ved bruk av M-mode teknikken innenfor Doppler ultralyd, med ... -
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 ...