Sökning: "motion correction"

Visar resultat 1 - 5 av 40 uppsatser innehållade orden motion correction.

  1. 1. Preprocessing for intravoxel incoherent motion analysis in the brain - Signal drift correction

    Master-uppsats,

    Författare :Amina Warsame; [2023-04-17]
    Nyckelord :Medical physics; Diffusion magnetic resonance imaging; dMRI; Intravoxel incoherent motion; IVIM;

    Sammanfattning : Diffusion magnetic resonance imaging (dMRI) is a diagnostic imaging technique that is sensitized to the movement of water molecules in tissues. Intravoxel incoherent motion (IVIM) analysis can be used to estimate blood flow in capillaries from weakly diffusion-weighted data. LÄS MER

  3. 2. Respiratory Motion Correction in PET Imaging: Comparative Analysis of External Device and Data-driven Gating Approaches

    Master-uppsats, KTH/Fysik

    Författare :Nina Lindström Söraas; [2023]
    Nyckelord :PET CT; Tomographic reconstruction; Respiratory gating techniques; Image registration; Motion correction; PET CT; Tomografisk rekonstruktion; Gating tekniker; Bildregistrering; Rörelsekorrigering;

    Sammanfattning : Positron Emission Tomography (PET) is pivotal in medical imaging but is prone to artifactsfrom physiological movements, notably respiration. These motion artifacts both degradeimage quality and compromise precise attenuation correction. LÄS MER

  4. 3. Attenueringskorrektion för ett rörelsekorrigerande neuralt nätverk i PET-undersökningar

    Kandidat-uppsats, KTH/Medicinteknik och hälsosystem

    Författare :David Nissolle; Daniel Karlström; [2023]
    Nyckelord :PET; attenuation correction; motion correction; deep learning; M-MLEM; PET; attenueringskorrektion; rörelsekorrektion; djupinlärning; M-MLEM;

    Sammanfattning : Positronemissionstomografi är en väl använd modalitet som kan hjälpa till att ge information om olika organs tillstånd. Ett problem som kan uppstå när man utför undersökningar är att patientrörelser, i synnerhet andning, förvränger de resulterande bilderna. LÄS MER

  5. 4. Spatiotemporal PET reconstruction with Learned Registration

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Pierre Meyrat; [2022]
    Nyckelord :PET; Tomographic reconstruction; Deep Learning; MLEM; PET; Tomografisk rekonstruktion; Deep Learning; MLEM;

    Sammanfattning : Because of the long acquisition time of Positron Emission Tomography scanners, the reconstructed images are blurred by motion. We hereby propose a novel motion-correction maximum-likelihood expectation-maximization algorithm integrating 3D movements between the different gates estimated by a neural network trained on synthetic data with contrast invariance. LÄS MER

  7. 5. Automatic magnetic resonance brain volume measurements to assess the effect of minimised blood sample extraction on brain development in extremely preterm infants

    Master-uppsats, Lunds universitet/Läkarutbildningen

    Författare :Hickmat Hamie; [2021]
    Nyckelord :Magnetic resonance imaging; Brain development; Prematurity; Medicine and Health Sciences;

    Sammanfattning : Aim: To evaluate a pipeline for automatic MRI brain segmentation and volumetric tissue structure quantification in a cohort of extremely preterm infants. Methods: 13 extremely preterm neonates underwent MRI-scanning at a term equivalent age. Seven of these subjects had suitable MRI sequences and were analyzed in the pipeline. LÄS MER