Sökning: "Gammastrålning"

Visar resultat 1 - 5 av 18 uppsatser innehållade ordet Gammastrålning.

  1. 1. Astrocyt biomarkörer vid neurotoxicitet

    Master-uppsats, Uppsala universitet/Institutionen för farmaceutisk biovetenskap

    Författare :Simel Danho; [2024]
    Nyckelord :Primer design; primer testning; hög dos gammastrålning; qPCR;

    Sammanfattning : Abstrakt Bakgrund: Barn som drabbas med tumörer behöver genomgå strålbehandling. För att uppnå optimala behandlingsresultat krävs sederingar eller generella anestesi. Tidigare studier har indikerat att strålningsspecifika effekter påverkade kognitiva funktioner hos barn. LÄS MER

  3. 2. Activity quantification of 177Lu using a 360◦ CZT gamma camera - comparison with a dual-head Anger camera

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Albin Lindvall; [2023]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Background and Aim: New SPECT cameras that use CZT detectors in a 360◦ configuration has recently been introduced. Together with Bayesian reconstruction methods employing Median Root Prior (MRP) and Relative Difference Prior (RDP), this constitutes an alternative to Anger-based SPECT for activity quantification. LÄS MER

  4. 3. Digitised charged-particle discrimination in CsI detector signals

    Kandidat-uppsats, Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

    Författare :Mats Bror Linus Persson; [2022]
    Nyckelord :Microball; Gammasphere; pulse-shape discrimination; scintillator; charge-comparison method; cosine similarity; exotic nuclei; fusion-evaporation reaction; Argonne National Laboratory; Physics and Astronomy;

    Sammanfattning : This work is aimed at improving the discrimination of protons and α particles in digitised signals from CsI(Tl) scintillators. This has been achieved using pulse-shape discrimination, wherein the shape of the pulses is used to learn which particle is detected. LÄS MER

  5. 4. 2D & 3D phase retrieval for propagation-based X-ray phase-contrast tomography

    Master-uppsats, Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Författare :Philip Stjärneblad; [2021]
    Nyckelord :Propagation-based X-ray phase-contrast tomography; PB-PCT; Propagation-based X-ray phase-contrast Imaging; PB-PCI; 2d phase retrieval; 3d phase retrieval; TIE; sinogram consistency; reconstruction artefacts; Science General;

    Sammanfattning : Propagation-based X-ray phase-contrast tomography is a 3d imaging technique that utilizes two-dimensional projections from different angular views $\theta =[0,\pi]$ to reconstruct the 3D object information. The phase-contrast allows for higher feature contrast than conventional transmission tomography, as the phase interference gives rise to a sharp edge contrast. LÄS MER

  7. 5. Gamma-ray tracking using graph neural networks

    Master-uppsats, KTH/Fysik

    Författare :Mikael Andersson; [2021]
    Nyckelord :Physics; Nuclear Physics; Detectors; Tracking; Neural Networks; GNN; Gamma-ray; Fysik; Kärnfysik; Detektorer; Tracking; Neurala Nät; GNN; Gammastrålning;

    Sammanfattning : While there are existing methods of gamma ray-track reconstruction in specialized detectors such as AGATA, including backtracking and clustering, it is naturally of interest to diversify the portfolio of available tools to provide us viable alternatives. In this study some possibilities found in the field of machine learning were investigated, more specifically within the field of graph neural networks. LÄS MER