Sökning: "k-space"

Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet k-space.

  1. 1. k-space Models in MRI Using the Concept of Partitions, Applications with special reference to Overhauser-enhanced techniques

    Författare :J Stefan Petersson; Malmö Medicinsk strålningsfysik; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; model; Physics; k-space; magnetic resonance imaging; Overhauser; simulation; Fysik;

    Sammanfattning : A new model describing the image formation in magnetic resonance imaging (MRI) has been developed. The k-space description of MRI pulse sequences is expanded by introducing new dimensions to describe the phase dispersion due to flow, acceleration, jerk, diffusion and magnetic field inhomogeneities. LÄS MER

  3. 2. Susceptibility effects in MRI and 1H MRS. The spurious echo artifact and susceptibility measurements

    Författare :Åsa Carlsson; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MRI; 1H MRS; susceptibility; spurious echo; artifact; artefact;

    Sammanfattning : When performing magnetic resonance (MR) experiments, a strong homogeneous magnetic field is often preferred, especially in clinical applications. However, all objects that are placed in the magnetic field will disturb the field homogeneity and cause local magnetic field gradients. LÄS MER

  4. 3. Fast and Accurate 4D Flow MRI for Cardiovascular Blood Flow Assessment

    Författare :Sven Petersson; Tino Ebbers; Oliver Wieben; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The study of blood flow is essential in understanding the physiology and pathophysiology of the cardiovascular system. Small disturbances of the blood flow may over time evolve and contribute to cardiovascular pathology. LÄS MER

  5. 4. Applications of the golden angle in cardiovascular MRI

    Författare :Alexander Fyrdahl; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : The use of radial trajectories has been seen as a potential solution to highly efficient cardiovascular magnetic resonance imaging (MRI). By acquiring a broad range of spatial frequencies per repetition time, the acquisition is time-efficient and robust against motion. LÄS MER

  7. 5. Capturing the breath of the heart by magnetic resonance imaging : five-dimensional cardio-respiratory resolved cine imaging during free breathing

    Författare :Karen Holst; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Cardiac imaging with cardiovascular magnetic resonance has the advantage of enabling dynamic visualizations, several quantifiable measures, and good soft-tissue contrast. However, a major drawback is the need for breath holding during many acquisitions to limit motion artifacts. LÄS MER