Sökning: "k-Space Filter"
Hittade 3 uppsatser innehållade orden k-Space Filter.
1. Designing k-Space Filters to Improve Spatiotemporal Resolution with Sector-Wise Golden Angle (SWIG)
Master-uppsats, KTH/Medicinteknik och hälsosystemSammanfattning : The aim of this thesis is to design and evaluate k-space weighting filters for simultaneously improving the spatial and temporal resolution of cardiovascular MRI, with the ultimate goal of improving the accuracy of quantitative flow measurements, which are important for diagnosis and follow-up of heart dysfunction. Two different k-space filters were implemented and evaluated retrospectively to already acquired data. LÄS MER
2. Extracting Cardiac and Respiratory Self-Gating Signals from Magnetic Resonance Imaging Data
Kandidat-uppsats, KTH/Skolan för teknik och hälsa (STH)Sammanfattning : Motion artefacts due to cardiac and respiratory motion present a daily challenge in cardiac Magnetic Resonance Imaging (MRI), and many different motion correction procedures are used in clinical routine imaging. To reduce motion artefacts further, patients are required to hold their breath during parts of the data acquisition, which is physically straining – especially when done repetitively. LÄS MER
3. Denoising of Complex MRI Data by Wiener-like Filtering in the Wavelet Domain - Application to High b-value Diffusion Weighted Imaging
Master-uppsats, Lunds universitet/SjukhusfysikerutbildningenSammanfattning : Noise is a well-known problem in many imaging modalities. In magnitude magnetic resonance images, obtained by quadrature detection, the associated Rician distribution of noise constitutes a further complication. This type of noise is especially problematic at low signal-to-noise ratio (SNR) regions. LÄS MER