Sökning: "voxel"

Visar resultat 16 - 20 av 72 avhandlingar innehållade ordet voxel.

  1. 16. Radiofrequenz-Pulse in der lokalisierten STEAM-Spektroskopie

    Författare :Gunther Helms; Lund Medicinsk strålningsfysik; []
    Nyckelord :;

    Sammanfattning : By definition, radiofrequency (RF) pulses are the pivotal elements of NMR pulse sequences. Vice versa, the effect of a particular pulse on the evolution of magnetization will depend on the context of the sequence. LÄS MER

  3. 17. Towards Clinical Implementation of Dynamic Positron Emission Tomography in Neurodegenerative Diseases

    Författare :My Jonasson; Mark Lubberink; Lieuwe Appel; Jens Sörensen; Michel Koole; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Positron emission tomography; PET; Molecular imaging; Quantification; Kinetic modelling; Parametric images; Alzheimer’s disease; Parkinson’s disease; Radiology; Radiologi;

    Sammanfattning : Alzheimer’s disease (AD) and Parkinson’s disease (PD) are the two most common neurodegenerative disorders worldwide. Positron emission tomography (PET), together with suitable biomarkers, can aid in the clin-ical evaluation as well as in research investigations of these diseases. LÄS MER

  4. 18. Measuring brain functions : statistical tests for neuroimaging data

    Författare :Anders Ledberg; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : This thesis is about statistical methods for functional neuroimaging data. With functional neuroimaging, here understood as PET and fMRI, the activity of the human brain can be studied in vivo. LÄS MER

  5. 19. Optimisation in strategies in diffusion tensor MR imaging

    Författare :Stefan Skare; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Diffusion tensor; magnetic resonance imaging; optimisation; artefacts;

    Sammanfattning : With diffusion MR imaging, the Brownian motion (or self-diffusion) of water molecules is measured. In the corresponding ADC (Apparent Diffusion Coefficient) image, each image element (voxel) represents the average diffusion. In MRI, the diffusion is measured with diffusion gradients along certain directions in space. LÄS MER

  7. 20. MRI Perfusion Measurements using Magnetic Susceptibility Effects: : Calibration Approaches and Contrast Agent Quantification

    Författare :Emelie Lind; Lund Medicinsk strålningsfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; contrast agent; cerebral blood flow; cerebral blood volume; mean transit time; perfusion; dynamic susceptibility contrast MRI; magnetic susceptibility;

    Sammanfattning : Exchange of oxygen and nutrients between blood and tissue occurs at the capillary level of the blood system. The blood volume flow rate in the capillaries is often referred to as perfusion, and knowledge about perfusion provides important information about the function and viability of the tissue, for example, in patients with ischaemic stroke, cancer, and neurodegenerative diseases. LÄS MER