Essays about: "gradient waveforms"

Found 3 essays containing the words gradient waveforms.

  1. 1. 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

  3. 2. Unsupervised Audio Spectrogram Compression using Vector Quantized Autoencoders

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Amund Hansen Vedal; [2019]
    Keywords : ;

    Abstract : Despite the recent successes of neural networks in a variety of domains, musical audio modeling is still considered a hard task, with features typically spanning tens of thousands of dimensions in input space. By formulating audio data compression as an unsupervised learning task, this project investigates the applicability of vector quantized neural network autoencoders for compressing spectrograms – image-like representations of audio. READ MORE

  4. 3. Diffusion MRI of Brain Tissue: Importance of Axonal Trajectory

    University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Kärnfysik

    Author : Jan Brabec; [2018]
    Keywords : dMRI; diffusion magnetic resonance; axonal trajectory; axonal geometry; undulations; modeling; axons; inverse problem; diffusion spectrum; time-dependent diffusion; Physics and Astronomy;

    Abstract : Obtaining microstructural information non-invasively on brain tissue remains a challenge. Diffusion magnetic resonance imaging (dMRI) is an imaging method that can provide such information. That includes geometrical considerations of nerve cells projections, axons, that are present in the white matter of the human brain. READ MORE