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Danish Research Centre for Magnetic Resonance (DRCMR)
Publication Repository
22 Publications


  • MR-skanning ved 7 tesla feltstyrke etableres i Danmark

    Igennem længere tid har en bred kreds af forskere og klinikere på hospitaler og universiteter [1] forsøgt at rejse de nødvendige midler til at etablere ultrahøjfelts MR-skanning i Danmark. I juni 2010 udløstes jubel, da “the John and Birthe Meyer Foundation” meget generøst bevilgede 38,6 Mkr til indkøb af en human MR-skanner med en feltstyrke på 7 tesla. Dette svarer til cirka 140 tusind gange jordens magnetfelt hvilket mere end fordobler hospitalernes hidt...

    Encoding of electrophysiology and other signals in MR images.

    PURPOSE: To develop a gradient insensitive, generic technique for recording of non-MR signals by use of surplus scanner bandwidth. MATERIALS AND METHODS: Relatively simple battery driven hardware is used to transform one or more signals into radio waves detectable by the MR scanner. Similar to the "magstripe" technique used for encoding of soundtracks in motion pictures, the electrical signals are in this way encoded as artifacts appearing in the MR images or spectra outside the region of int...

    Reconstruction strategy for echo planar spectroscopy and its application to partially undersampled imaging.

    The most commonly encountered form of echo planar spectroscopy involves oscillating gradients in one spatial dimension during readout. Data are consequently not sampled on a Cartesian grid. A fast gridding algorithm applicable to this particular situation is presented. The method is optimal, i.e., it performs as well as the full discrete Fourier transform for band limited signals while allowing for use of the fast Fourier transform. The method is demonstrated for reconstruction of data that a...

    A graphical simulator for teaching basic and advanced MR imaging techniques.

    Teaching of magnetic resonance (MR) imaging techniques typically involves considerable handwaving, literally, to explain concepts such as resonance, rotating frames, dephasing, refocusing, sequences, and imaging. A proper understanding of MR contrast and imaging techniques is crucial for radiologists, radiographers, and technical staff alike, but it is notoriously challenging to explain spin dynamics by using traditional teaching tools. The author developed a freely available graphical simula...

    Shift Invariant Multilinear Decomposition of Neuroimaging Data

    We present an algorithm for multilinear decomposition that allows for arbitrary shifts along one modality. The method is applied to neural activity arranged in the three modalities space, time, and trial. Thus, the algorithm models neural activity as a linear superposition of components with a fixed time course that may vary across either trials or space in its overall intensity and latency. Its utility is demonstrated on simulated data as well as actual EEG, and fMRI data. We show how shift-...
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