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Detection of demyelinated plaques with xenon-enhanced computed tomography (1980)

Haughton, V. ; Schmidt, J. ; Syvertsen, A. ; [et al.]

Springer

Neuroradiology 20 (1980), S. 181-183

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ISSN: 1432-1920

Keywords: Demyelinated plaques ; Xenonenhanced CT

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Studies of xenon-enhanced CT for detecting cerebral demyelination have produced conflicting results. Therefore, we studied the effect of xenon inhalation on the CT appearance of five demyelinated plaques. The plaques and the surrounding white matter increased commensurately in attenuation during xenon inhalation. Therefore, xenon enhancement does not generally increase the sensitivity of CT for detecting cerebral demyelination.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00336679

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Determination of the cone radius for positive concave operators (1984)

Burmeister, W. ; Schmidt, J. W.

Springer

Computing 33 (1984), S. 37-49

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ISSN: 1436-5057

Keywords: 65H10 ; 90C30 ; 15A48 ; Iterative processes ; bestR-orders ; cone radius of concave operators ; spectral radii ; partial ordering

Source: Springer Online Journal Archives 1860-2000

Topics: Computer Science

Description / Table of Contents: Zusammenfassung Die Berechnung der bestenR-Ordnung von Folgen aus iterativen Näherungsverfahren führt auf die Ermittlung des hier eingeführten Kegelradius bestimmter konkaver Operatoren. Das Hauptergebnis der Arbeit ist die Darstellung des Kegelradius als Infimum der Spektralradien aller den konkaven Operator majorisierenden linearen Operatoren. Diese Charakterisierung ist von numerischem Intersse.

Notes: Abstract The computation of bestR-orders of sequences produced by iterative methods leads to the determination of the cone radius of certain concave operators. The main result of the paper is the representation of the cone radius as the infimum of spectral radii of all linear operators majorizing the concave operator. This characterization is of numerical interest.