Essays about: "Radial k-space sampling"

Showing result 1 - 5 of 7 essays containing the words Radial k-space sampling.

1. 1. Enabling Hybrid Real Time and Retrospectively Gated Imaging in a Numerical Phantom

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

   Author : Sara Mineur; [2023]
   Keywords : Cardiovascular Magnetic resonance Imaging CMR ; Sector Wise Golden-Angle SWIG ;

   Abstract : Sector-Wise Golden Angle (SWIG) is a novel approach that was developed to address the limitations associated with Golden Angle radial imaging, commonly used for high temporal resolution flow measurements. Golden angle radial imaging is a time-efficient method that effectively reduces motion sensitivity. READ MORE

3. 2. 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

4. 3. 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

5. 4. 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

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

   University essay from Datorseende

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

   Abstract : 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. READ MORE