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Search: WFRF:(Görke U)

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1.
  • Görke, U, et al. (author)
  • Visualization of anisotropic pulsations in extraembryonic compartments of incubated quail eggs by NMR microimaging.
  • 1996
  • In: Magnetic Resonance Imaging. - 0730-725X .- 1873-5894. ; 14:9, s. 1079-84
  • Journal article (peer-reviewed)abstract
    • Multi-plane tagging time-of-flight and bipolar gradient phase-encoding and amplitude-weighting NMR microimaging techniques have been employed to study transport in extraembryonic compartments of fertilized quail eggs during the first seven days of incubation. After the fourth day coherent and incoherent motions became visible in certain regions, in particular in the upper part of the albumen. Coherent motions as visualized by deformations of multiplane tagging grids were specified by local velocities less than 1 mm/s at most. On the other hand, incoherent motions led to much more pronounced phenomena. The multiplane tagging grid completely faded in a region comprising the upper third of the albumen after 4.5 incubation days. Images weighted by signal attenuation owing to incoherent displacements indicate motions in the same region. The fact that a reproducible localization of the motions is only possible when signals from different transients are averaged indicates that the incoherence at least partly is temporal in nature. The signal intensity of a volume selected in the incoherent-motion region consequently fluctuates with time. The Fourier analysis of these fluctuations revealed a distinct pulsation with a frequency of 0.4 Hz.
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2.
  • Weis, J, et al. (author)
  • Susceptibility, field inhomogeneity, and chemical shift-corrected NMR microscopy : application to the human finger in vivo
  • 1996
  • In: Magnetic Resonance Imaging. - 0730-725X .- 1873-5894. ; 14:10, s. 1165-1175
  • Journal article (peer-reviewed)abstract
    • Spectroscopic proton image data recorded with the aid of a gradient-echo spectroscopic imaging pulse sequence are reported. A postdetection processing method is suggested which permits correction of artifacts due to inhomogeneity, susceptibility, and chemical-shift resonance offsets. That is, apart from the spectral information available in this way, better spatial resolutions can be achieved. The method is demonstrated by resonance-offset corrected images of the human finger in vivo. Moreover, resonance-line selective and spectroscopically resolved diffusion-weighted images and diffusivity maps rendered with the aid of the same postdetection procedure are shown.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Weis, J (2)
Görke, U (2)
Kimmich, R (2)
University
Uppsala University (2)
Language
English (2)
Year
1996 (2)

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