Sökning: "PRESTO-CAN"

Hittade 3 uppsatser innehållade ordet PRESTO-CAN.

  1. 1. In-Plane Motion Correction in Reconstruction of non-Cartesian 3D-functional MRI

    Master-uppsats, Datorseende; Tekniska högskolan

    Författare :Anette Karlsson; [2011]
    Nyckelord :MRI; fMRI; PRESTO-CAN; Motion Correction; Radial Sampling Pattern; Fourier domain; Circular Correlation; Gridding Reconstruction;

    Sammanfattning : When patients move during an MRI examination, severe artifacts arise in the reconstructed image and motion correction is therefore often desired. An in-plane motion correction algorithm suitable for PRESTO-CAN, a new 3D functional MRI method where sampling of k-space is radial in kx-direction and kz-direction and Cartesian in ky-direction, was implemented in this thesis work. LÄS MER

  3. 2. Improved Temporal Resolution Using Parallel Imaging in Radial-Cartesian 3D functional MRI

    Master-uppsats, Datorseende

    Författare :Gustav Ahlman; [2011]
    Nyckelord :fMRI; PRESTO-CAN; SENSE; parallel imaging; temporal resolution; radial-Cartesian sampling; normalized convolution;

    Sammanfattning : MRI (Magnetic Resonance Imaging) is a medical imaging method that uses magnetic fields in order to retrieve images of the human body. This thesis revolves around a novel acquisition method of 3D fMRI (functional Magnetic Resonance Imaging) called PRESTO-CAN that uses a radial pattern in order to sample the (kx,kz)-plane of k-space (the frequency domain), and a Cartesian sample pattern in the ky-direction. LÄS MER

  4. 3. Method for Acquisition and Reconstruction of non-Cartesian 3-D fMRI

    Magister-uppsats, Bildbehandling; Tekniska högskolan

    Författare :Per Thyr; [2008]
    Nyckelord :MRI; PRESTO; PRESTO CAN; rotation; sequence development; image reconstruction; gridding; phase correction;

    Sammanfattning : The PRESTO sequence is a well-known 3-D fMRI imaging sequence. In this sequence the echo planar imaging technique is merged with the echo-shift technique. This combination results in a very fast image acquisition, which is required for fMRI examinations of neural activation in the human brain. LÄS MER