Browsing NTNU Open by Author "Goa, Pål Erik"
Now showing items 1-20 of 42
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3D-EPI with parallel imaging acceleration along two Axis: Evaluated with Phantom Study and BOLD fMRI
Vaksdal, Martin (Master thesis, 2013)The function of the human brain has for many years been an intriguing field of research, and has led to the discovery of functional MRI (fMRI). fMRI is dependent on high spatial and temporal resolution to acquire detailed ... -
A Comparison of Biological Dose Estimates in Proton and Carbon Ion Therapy Based on Averaged and Full Linear Energy Transfer Spectra
Rørvik, Eivind (Master thesis, 2015)Radiotherapy with ions, also known as particle therapy, is increasing rapidly. Shifting from photons to protons and carbons is not only a great technological transition, but also a shift in physics and in radiobiology. ... -
Accuracy of breast cancer lesion classification using intravoxel incoherent motion diffusion-weighted imaging is improved by the inclusion of global or local prior knowledge with bayesian methods
Vidic, Igor; Jerome, Neil Peter; Bathen, Tone Frost; Goa, Pål Erik; While, Peter Thomas (Journal article; Peer reviewed, 2019)Background Diffusion‐weighted MRI (DWI) has potential to noninvasively characterize breast cancer lesions; models such as intravoxel incoherent motion (IVIM) provide pseudodiffusion parameters that reflect tissue perfusion, ... -
Applying generative adversarial networks for anomaly detection in hyperspectral remote sensing imagery
Eide, Aksel Wilhelm Wold (Master thesis, 2018)Automatic anomaly detection has previously been implemented on hyperspectral images by use of different statistical methods with good results. We apply a machine learning method using generative adversarial networks (GAN) ... -
Attenuation correction in PET/MR: A performance assessment of UTE-based and Dixon-based methods for PET attenuation correction
Aasheim, Lars Birger (Master thesis, 2014)Hybrid positron emission tomography/magnetic resonance imaging (PET/MR) scanners are one of the latest tools available in the field of medical imaging, and are expected to outperform the well-established PET/X-ray computed ... -
Brain Development after Neonatal Intermittent Hyperoxia-Hypoxia in the Rat Studied by Longitudinal MRI and Immunohistochemistry
Morken, Tora Sund; Nyman, Axel Karl Gottfrid; Sandvig, Ioanna; Torp, Sverre Helge; Skranes, Jon Sverre; Goa, Pål Erik; Brubakk, Ann-Mari; Widerøe, Marius (Journal article; Peer reviewed, 2013)Background: Neonatal intermittent hyperoxia-hypoxia (IHH) is involved in the pathogenesis of retinopathy of prematurity. Whether similar oxygen fluctuations will create pathological changes in the grey and white matter ... -
Characterization of anisotropy in articular cartilage samples using magnetic resonance imaging (MRI) and multiphoton microscopy (MPM)
Teklehaymanot, Yemane (Master thesis, 2016)Articular cartilage is a thin flexible tissue found at the ends of the bones in a joint that provides a lubricated surface for articulation and distribute loads with low friction. However, due to degenerative diseases, ... -
Charge Diffusion Modelling for a Monolithic Active Pixel Sensor Detector with Application to Proton CT
Hansen, Even Hunnes Helgesen (Master thesis, 2017)A model for charge diffusion in a monolithic active pixel sensor detector was studied with application to a digital tracking calorimeter, proposed for use in proton computed tomography. The model was implemented in C++, ... -
Classification of Breast Cancer Based on DCE MRI
Løkken, Ingrid Quist (Master thesis, 2017)This master thesis is a part of a project at the MR group at the department of physics at NTNU. The aim of MR group is to make a model which is able to classify the subtype of breast tumours. In this master thesis the focus ... -
Comparison of two diffusion weighted MR protocols for detecting Differences in Microvasculature in chronic Pancreatitis and Pancreas Cancer
Boland, Ingrid (Master thesis, 2016)Pancreatic cancer is a type of cancer with high mortality. Unspecific, or the absence of, symptoms result in late diagnosis, which is fatal when the only curable treatment is surgical removal of the tumor. Differentiating ... -
Data acquisition for high resolution blood oxygen level dependent fMRI
Ladstein, Jarle (Doctoral theses at NTNU;2018:75, Doctoral thesis, 2018)Blood oxygen level dependent functional magnetic resonance imaging (BOLD fMRI) is an important non-invasive technique for investigation of brain function. Using BOLD fMRI, brain activity can be localized with high spatial ... -
Discrimination of Breast Cancer from Healthy Breast Tissue Using a Three-component Diffusion-weighted MRI Model
Andreassen, Maren Marie Sjaastad; Rodriguez-Soto, Ana; Conlin, CC; Vidić, I; Seibert, TM; Wallace, AM; Zare, S; Kuperman, J; Abudu, B; Ahn, GS; Hahn, M; Jerome, Neil Peter; Østlie, Agnes; Bathen, Tone Frost; Ojeda-Fournier, H; Goa, Pål Erik; Rakow-Penner, Rebecca; Dale, AM (Peer reviewed; Journal article, 2020)Purpose: Diffusion-weighted MRI (DW-MRI) is a contrast-free modality that has demonstrated ability to discriminate between predefined benign and malignant breast lesions. However, how well DW-MRI discriminates cancer from ... -
Effect of task-correlated physiological fluctuations and motion in 2D and 3D echo-planar imaging in a higher cognitive level fMRI paradigm
Ladstein, Jarle; Evensmoen, Hallvard Røe; Håberg, Asta; Kristoffersen, Anders; Goa, Pål Erik (Journal article; Peer reviewed, 2016)Purpose: To compare 2D and 3D echo-planar imaging (EPI) in a higher cognitive level fMRI paradigm. In particular, to study the link between the presence of task-correlated physiological fluctuations and motion and the fMRI ... -
Electrical Bioimpedance Based Heart Monitoring System
Gåsland, Bergljot Matre (Master thesis, 2016)There is a great need for monitoring devices in the intensive care unit during, and after, cardiac surgery to be able to detect anomalies at an early stage. The techniques used today are good, but limited in di erent ways. ... -
The Establishment of an Intravoxel Incoherent Motion Based MRI-Protocol for Differentiation of Focal Lesions in the Pancreas
Hillestad, Tiril (Master thesis, 2015)The mortality related to pancreatic cancer is high. It spreads rapidly and as the situation is today it is often not diagnosed until a quite late stage. However, recent studies have shown that the intravoxel incoherent ... -
Exploring the diagnostic potential of adding T2 dependence in diffusion-weighted MR imaging of the prostate
Syversen, Ingrid Framås; Elschot, Mattijs; Sandsmark, Elise; Bertilsson, Helena; Bathen, Tone Frost; Goa, Pål Erik (Peer reviewed; Journal article, 2021)Background: Magnetic resonance imaging (MRI) is essential in the detection and staging of prostate cancer. However, improved tools to distinguish between low-risk and high-risk cancer are needed in order to select the ... -
Favorable effects on arterial stiffness after renal sympathetic denervation for the treatment of resistant hypertension: a cardiovascular magnetic resonance study
Hammer, Tommy Arild; Langlo, Knut Asbjørn Rise; Goa, Pål Erik; Fadl Elmula, Fadl Elmula M.; HOFFMANN, PAVEL; STENSÆTH, KNUT-HAAKON (Peer reviewed; Journal article, 2016)Aims: Renal sympathetic denervation (RDN) has recently been suggested to be a novel treatment strategy for patients with treatment-resistant hypertension. However, the latest randomized studies have provided conflicting ... -
Feasibility of contrast-enhanced MRI derived textural features to predict overall survival in locally advanced breast cancer.
Chronaiou, Ioanna; Giskeødegård, Guro F.; Goa, Pål Erik; Teruel, Jose; Hedayati, Roja; Lundgren, Steinar; Huuse, Else Marie; Pickles, Martin D.; Gibbs, Peter; Sitter, Beathe; Bathen, Tone Frost (Journal article; Peer reviewed, 2019)Background The prognosis for women with locally advanced breast cancer (LABC) is poor and there is a need for better treatment stratification. Gray-level co-occurrence matrix (GLCM) texture analysis of magnetic resonance ... -
Feasibility of Using Phototherapy with Sunlight for Treatment of Neonatal Jaundice in Low-Income Countries
Rønneberg, Sigrid (Master thesis, 2016)This thesis aimed to investigate the feasibility of using sunlight exposure as treatment for neonatal jaundice in low-income countries. The investigation answered four questions: 1. Is it feasible to treat infants with ... -
Implementation of geometric distortion correction of EPI images in clinical workflow
Syversen, Ingrid Framås (Master thesis, 2018)Background: Geometric distortion in echo-planar (EPI) magnetic resonance (MR) images, caused by low bandwidth combined with variations in magnetic susceptibility, is a problem that can make it challenging to connect ...