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Browsing Masteruppsatser / Medicinsk strålningsvetenskap by Title
Now showing items 1-20 of 48
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Accumulation of 63Ni, 106Ru and 125Sb in phytoplankton
(2022-08-22)Background: Nuclear Power Plants (NPPs) release small amounts of radionuclides which contribute with a low radiation dose to the environment as well as humans and animals. In this context, marine ecosystems are critical, ... -
Age-Related Late Effects in Rat Thyroids After Internal 131I Exposure
(2024-09-23)The Chernobyl nuclear accident left many questions in its wake. One of these questions was why children affected by the radioactive fallout seemed to have a higher incidence of thyroid cancer compared with adults in the ... -
Anatomical segmentation of the human brain: comparative assessment of two automatic methods
(2023-08-22)Magnetic Resonance Imaging (MRI) is a robust and versatile imaging modality and an integral component of a lot of studies, especially when performing quantitative analysis. MRI is the preferred method of imaging the ... -
Apoptosis induction in breast cancer cells after radiotherapy and potential radiosensitizers
(2023-06-27)Background. Today breast cancer is the foremost cancer death type amongst women around the world. At present some of the toughest challenges in the clinic is recurrent, radioresistant breast cancer, and metastatic breast ... -
APOPTOTIC EFFECTS IN RENAL CORTEX AFTER TREATMENT WITH 177LU-OCTREOTATE
(2021-05-10)Purpose: The purpose of this project was to investigate gene regulation of a predetermined panel of apoptotic genes in murine renal cortex after treatment with 177Lu-octreotate after one day and seven days. Theory: ... -
Assessment of bioaccessibility of naturally occurring radionuclides from snus to consumers
(2025-03-05)Purpose: Naturally occuring radionuclides can be found in everything we consume, including the tobacco used to make snus. This study aimed to investigate the presence of naturally occurring radionuclides in snus, their ... -
ATLAS DATABASES OF HUMAN BRAIN ANATOMY: QUALITATIVE AND QUANTITATIVE COMPARISON
(2021-01-11)The purpose of this study was to quantitatively and qualitatively compare the two brain atlases databases, Hammersmith and 2012 MICCAI Multi-Atlas Labelling Challenge data, by developing a quantitative method. Theory Anatomical ... -
ATLAS-BASED SEGMENTATION OF ULTRAHIGH-RESOLUTION STRUCTURAL MR HEAD IMAGES ACQUIRED AT 7 TESLA
(2022-01-13)Purpose: The purpose of this work was to find out how the existing brain atlases and segmentation algorithms perform when applied to ultrahigh-resolution MR brain images, acquired with a 7-Tesla scanner. Also to make ... -
Automatic exposure control for digital radiography without a physical anti-scatter grid
(2025-09-04)Purpose: This study aimed to find a factor R for different parameter settings that can be used to adjust the AEC preset value, in order to maintain a constant amount of primary radiation to the detector when the anti-scatter ... -
Brain morphometry in Parkinson’s disease
(2023-03-02)Abstract Purpose The purpose of this brain morphometry study was to examine the volumes of different regions of the brain by research participants with Parkinson’s disease. Method To carry out the study, MR (magnetic ... -
Can cooking practices affect dietary exposure to 210Po in seafood?
(2024-11-13)Background: The estimated yearly worldwide average exposure to radiation is about three mSv, with 2.4 mSv coming from natural radiation sources. 210Po is a highly radiotoxic decay product of 238U and a major contributor ... -
CHARACTERIZATION AND EVALUATION OF A NIPAM POLYMER GEL MRI DOSIMETER SYSTEM
(2022-11-08)Purpose: The normoxic polymer gel dosimeter based on N-isopropyl acrylamide (NiPAM) is a promising full 3D-dosimeter with high spatial resolution and near tissue equivalency. However, limited work have been done in vestigating ... -
Characterization of discrepancies between manual and automatic segmentation to improve anatomical brain atlases
(2021-05-10)Purpose: To characterize discrepancies between expert manually segmented brain images from Hammers Atlas Database and automatically generated segmentations of the same images; to decide whether they can be attributed ... -
Characterization of spinal tissue in lumbar spinal stenosis by advanced image analysis of MR images
(2025-03-24)Background. Lumbar spinal stenosis (LSS) is known for causing back and leg pain due to nerve compression but the impact on structures such as intervertebral discs (IVDs), vertebrae, and ligaments is still poorly understood. ... -
COMPARISON OF MULTI-CRITERIA OPTIMIZATION IN TWO DIFFERENT TREATMENT PLANNING SYSTEMS
(2021-05-10)Purpose: The purpose with this study was to compare multi-criteria optimization (MCO) for volumetric modulated arc therapy (VMAT) treatment plans in two different treatment planning systems. Theory: When performing ... -
Compartment model for radon-induced absorbed dose in lungs
(2024-04-23)Inhalation of radon gas and radon daughters has since a long time been reported as the second leading cause of lung cancer after smoking. The biological hazards make it therefore important to quantify the absorbed doses ... -
Deep Neural Networks for Noise Reduction and Bias Removal in MR Diffusion Signal
(2022-03-22)The purpose of this study is to assess the potential of deep neural networks, trained by unsupervised learning, for diffusion weighted imaging (DWI) data modeling and denoising. DWI data were modeled by a biexponential ... -
DEFORMABLE IMAGE REGISTRATION OF SPINE MAGNETIC RESONANCE IMAGES WITH ELASTIX FOR DETAILED CHARACTERIZATION OF DISC LOADING BEHAVIORS
(2021-05-10)Purpose: This work aimed to develop an optimized strategy for registration of spine magnetic resonance (MR) images acquired with and without spinal loading, as well as evaluate the quality of the registration strategy ... -
Developing an Energy Resolution Model for Monte Carlo-Based SPECT Simulation and Reconstruction Using a GE Discovery NM/CT 670 Pro System
(2024-09-23)Aim: In order to apply Monte Carlo (MC)-based algorithms for simulations of gamma camera acquisitions, the intrinsic characteristics of the system must be properly defined. This study aimed to determine the energy resolution ... -
DEVELOPMENT, VALIDATION AND APPLICATION OF A METHOD FOR DETERMINATION OF METABOLITE CONCENTRATIONS WITH PRECLINICAL MAGNETIC RESONANCE SPECTROSCOPY
(2021-05-10)Background: Information on the metabolic content in tissue has diagnostic and prognostic value when examining for example cancer and diseases of the brain. MR spectroscopy is a non-invasive method that allows quantification ...