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  • 32.80  (1)
  • Angiography  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Registered image subtraction for CT-, MR- and coronary angiography (1997)
    Springer
    European radiology 7 (1997), S. 82-89 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Image registration ; Image subtraction ; DSA ; Image processing ; Angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Conventional post-processing of digital subtraction angiography (DSA) by 3D spiral CT, 3D MRI and 2D DSA is often hampered by extended artefacts due to patient movements during examination. In this paper an image registration procedure prior to the digital subtraction is introduced allowing an enhanced visualization of the contrast agent. The object displacement is detected by analysis of image deformations in small local regions. The motion pattern is used to compute a new synthetic mask of maximum congruence with the contrast medium image. This new mask image is then used in the subsequent subtraction. The algorithm works fully automatically and does not need any interactive placement of landmarks. Results obtained from subtraction of uncorrected and corrected sequences were compared with each other. The registration procedure provided good results in the suppression of subtraction artefacts and in the enhancement of vascular structures. Results are presented from subtraction of 2D and 3D data from CTA, MR mammography and coronary angiography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050115
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Collision spectroscopy with aligned and oriented atoms (1991)
    Springer
    The European physical journal 18 (1991), S. 231-234 
    Details
    ISSN: 1434-6079
    Keywords: 34.00 ; 34.70 ; 32.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutralisation processes in 0.15–1.5 keV collisions of H− with Na atoms in the 3s ground state or in the excited 3p state have been investigated by means of time-of-flight analysis of the neutral H atoms produced. The H− - Na(3p) system, investigated here for the first time, is particularly interesting since the entrance channel is embedded in the [H - Na(3s)] +e − continuum, enabling Penning detachment to occur. The measured relative neutralisation cross section ratios σ(3p)/σ(3s) decrease from 3 to 1.6 with increasing energy. Based on earlier published results for σ(3s), σ(3p) total cross sections exceeding 100 Å2 are estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437076
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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