Sökning: "motion correction"
Visar resultat 1 - 5 av 40 uppsatser innehållade orden motion correction.
1. Preprocessing for intravoxel incoherent motion analysis in the brain - Signal drift correction
Master-uppsats,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
2. Respiratory Motion Correction in PET Imaging: Comparative Analysis of External Device and Data-driven Gating Approaches
Master-uppsats, KTH/FysikSammanfattning : 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
3. Attenueringskorrektion för ett rörelsekorrigerande neuralt nätverk i PET-undersökningar
Kandidat-uppsats, KTH/Medicinteknik och hälsosystemSammanfattning : 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
4. Spatiotemporal PET reconstruction with Learned Registration
Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)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
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/LäkarutbildningenSammanfattning : 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