Browsing NTNU Open by Author "Torp, Hans"
Now showing items 41-60 of 61
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Methods for improving quality and efficiency in quantitative echocardiography: Aspects of using high frame rate
Aase, Svein (Doktoravhandlinger ved NTNU, 1503-8181; 2008:53, Doctoral thesis, 2008)Ultralyd er i dag et standardverktøy innen hjertediagnostikk. Analyse av ventrikkelfunksjon gjøres subjektivt ved å se på gråskala ultralydopptak av hjertet. Dette gjør dokumentasjon og opplæring vanskelig. Det er derfor ... -
Modeling and monitoring cerebral blood flow in premature infants with patent ductus arteriosus using ultrasound Doppler technique
Tran, Alex (Master thesis, 2018)The aim of this thesis was to simulate cerebral bloodflow of premature infants with patent ductus arteriosus, using a lumped model. A linear Windkessel-3 model with constant peripheral resistance, and a non-linear Windkessel-3 ... -
Modeling of Peripheral Resistance in the Microvasculature for Diabetic Patients with Ultrasound Doppler Technique
Wisløff, Anna Karoline (Master thesis, 2018)Diabetes is a growing health problem worldwide and involves long-term complications. Microangiopathy is one of the main issues associated with diabetes and is a condition that is difficult to detect. The aim of this project ... -
Motion Tracking by Transverse Oscillations in 3D Cardiac Ultrasound Imaging
Bech, Solveig (Master thesis, 2017)Quantitative measurements of myocardial deformation has proved to be useful in assessment of cardiovascular diseases. Therefore, estimation of the motion of cardiac tissue has been an active field of research for many ... -
NeoDoppler: New ultrasound technology for continous cerebral circulation monitoring in neonates.
Vik, Sigrid Dannheim; Torp, Hans; Follestad, Turid; Støen, Ragnhild; Nyrnes, Siri Ann (Journal article; Peer reviewed, 2019)BACKGROUND: There is a strong need for continuous cerebral circulation monitoring in neonatal care, since suboptimal cerebral blood flow may lead to brain injuries in preterm infants and other critically ill neonates. ... -
Practical use of Block-Matching in 3D Speckle Tracking
Nielsen, Karl Espen (Master thesis, 2009)In this thesis, optimizations for speckle tracking are integrated into an existing framework for real-time tracking of deformable subdivision surfaces. This is employed in the segmentation of the the left ventricle (LV) ... -
Quantifying Valve Regurgitation using 3-D Doppler Ultrasound Images and Deep Learning
Wifstad, Sigurd Vangen; Løvstakken, Lasse; Avdal, Jørgen; Berg, Erik Andreas Rye; Torp, Hans; Grenne, Bjørnar; Fiorentini, Stefano (Peer reviewed; Journal article, 2022)Accurate quantification of cardiac valve regurgitation jets is fundamental for guiding treatment. Cardiac ultrasound is the preferred diagnostic tool, but current methods for measuring the regurgitant volume (RVol) are ... -
Quantifying Valve Regurgitation Using 3-D Doppler Ultrasound Images and Deep Learning
Wifstad, Sigurd Vangen; Løvstakken, Lasse; Avdal, Jørgen; Berg, Erik Andreas Rye; Torp, Hans; Grenne, Bjørnar; Fiorentini, Stefano (Peer reviewed; Journal article, 2022)Accurate quantification of cardiac valve regurgitation jets is fundamental for guiding treatment. Cardiac ultrasound is the preferred diagnostic tool, but current methods for measuring the regurgitant volume are limited ... -
Quantitative Doppler analysis using color flow imaging and adaptive signal processing
Karabiyik, Yücel (Doctoral theses at NTNU;2017:227, Doctoral thesis, 2017)Kvantitative Doppler-m˚alinger fra farge-Doppler ved bruk av adaptiv signalprosessering Medisinsk ultralyd er et viktig verktøy i obstetrikk for ˚a vurdere mors helse og fosterets utvikling gjennom svangerskapet. ... -
Real-time feedback on chest compression efficacy by hands-free carotid Doppler in a porcine model
Faldaas, Bjørn Ove; Nielsen, Erik Waage; Storm, Benjamin Stage; Lappegård, Knut Tore; Nilsen, Bent Aksel; Kiss, Gabriel Hanssen; Skogvoll, Eirik; Torp, Hans; Ingul, Charlotte Ingeborg Björk (Journal article; Peer reviewed, 2024)Aim: Current guidelines for cardiopulmonary resuscitation (CPR) recommend a one-size-fits-all approach in relation to the positioning of chest compressions. We recently developed RescueDoppler, a hands-free Doppler ultrasound ... -
Retrospective Transmit beamforming and Coherent Plane-Wave Compounding for Microvascular Doppler Imaging: A Comparison Study
Golfetto, Cristiana; Ekroll, Ingvild Kinn; Torp, Hans; Løvstakken, Lasse; Avdal, Jørgen (Peer reviewed; Journal article, 2020)Imaging blood flow in small vessels is of great clinical value for evaluating increased vascularization, potentially related to angiogenesis in cancer or inflammation processes in musculoskeletal disease. Using a traditional ... -
Robust Landmark Detection of the Left Ventricle Based on 2D Ultrasound Image Data
Selle, Arne (Master thesis, 2017)Echocardiography, or cardiac ultrasound, is a convenient imaging modality for bedside examination of the heart in real-time. However, acquiring ultrasound images of good quality is challenging, and currently ultrasound ... -
Segmentation of Right Ventricle in 3D Ultrasound Recordings
Engås, Asbjørn Breivik (Master thesis, 2008)This thesis presents segmentation of the right ventricle of the heart in real-time tracking of 3D ultrasound recordings. A simple deformable model for the right ventricle is developed based on statistical data from manual ... -
Shear displacement of a microcalcification in breast tissue
Fallrø, Ulrik (Master thesis, 2018)Breast cancer is the second largest cause of cancer death for women. Irregular patterns of microcalcifications in the breast may indicate a malignant cancer tumor, which is used as an important indicator in the diagnosis ... -
Simulation of nonlinear wave propagation in ultrasound.
Seljåsen, Håkon (Master thesis, 2014)Nonlinear wave propagation has, for the last couple of decades, become an increasingly more important tool in medical ultrasound imaging. Creating ultrasound images from echoes in the second harmonic frequency band provides ... -
Tablet User Interface Evaluation for a Portable Ultrasound System and Real time Doppler SpectrumProcessing
Kumssa, Aida Meredassa (Master thesis, 2013)In this thesis, real time Doppler spectrum processing and Tablet user interface evaluation for portable ultrasound system is done.In most ultrasound machines, fast fourier transform and other spectral processing requires ... -
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 ... -
Ultrasound Based Localization and Quantification of Skeletal Muscle Contraction
Heger, Max (Master thesis, 2014)Earlier experiments indicates that motor unit activity during isometric contractions can be imaged using a high-definition ultrasound scanner. In this study, ultrasound raw-data is analysed in MATLAB to localize and quantify ... -
Ultrasound Contrast Imaging - Improved Tissue Suppression in Amplitude Modulation
Hofstad, Erlend Fagertun (Master thesis, 2006)The ability to image myocardial perfusion is very important in order to detect coronary diseases. GE Vingmed Ultrasound uses contrast agent in combination with a pulse inversion (PI) technique to do the imaging. But this ... -
Ultrasound Strain Rate Imaging of Individual Muscle Motor Units
Heger, Max; Stavdahl, Øyvind; Torp, Hans (Journal article; Peer reviewed, 2014)Skeletal muscle is organized in motor units, each comprising a motor neuron and all its connected muscle fibres. The arrival of an action potential (a neural “impulse”) causes the fibers to contract, they exhibit a twitch. ...