Essays about: "radiell sampling"

Found 3 essays containing the words radiell sampling.

  1. 1. Reduction of streak artifacts in radial MRI using CycleGAN

    University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Author : Amanda Ullvin; [2020]
    Keywords : MRI; Cardiovascular; CMR; Medical Imaging; Radial k-space sampling; Sub-Nyquist sampling; Golden Angle; GRASP; Compressed Sensing; Artificial Intelligence; Neural Network; Deep Learning; GAN; CycleGAN;

    Abstract : One way of reducing the examination time in magnetic resonance imaging (MRI) is to reduce the amount of raw data acquired, by performing so-called undersampling. Conventionally, MRI data is acquired line-by-line on a Cartesian grid. READ MORE

  3. 2. Correction of Radial Sampling Trajectories by Modeling Nominal Gradient Waveforms and Convolving with Gradient Impulse Response Function

    University essay from KTH/Medicinteknik och hälsosystem

    Author : Max Kim; Adham Belbaisi; [2019]
    Keywords : Magnetic resonance imaging; MRI; gradient waveforms; radial sampling; gradient imperfections; gradient impulse response function; GIRF; Magnetresonanstomografi; MRI; gradient vågformer; radiell sampling; gradient imperfektioner; gradient impulsresponsfunktion; GIRF;

    Abstract : There are several reasons for using non-Cartesian k-space sampling methods in Magnetic Resonance Imaging (MRI). Such a method is radial sampling, which includes the advantage of continuous coverage of the k-space center which results in higher robustness to motion. READ MORE

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

    University essay from Datorseende; Tekniska högskolan

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

    Abstract : 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. READ MORE