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Erschienen in: European Radiology 4/2011

01.04.2011 | Magnetic Resonance

Analysing the response in R2* relaxation rate of intracranial tumours to hyperoxic and hypercapnic respiratory challenges: initial results

verfasst von: A. Müller, S. Remmele, I. Wenningmann, H. Clusmann, F. Träber, S. Flacke, R. König, J. Gieseke, W. A. Willinek, H. H. Schild, P. Mürtz

Erschienen in: European Radiology | Ausgabe 4/2011

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Abstract

Objective

To investigate the response in R2* relaxation rate of human intracranial tumours during hyperoxic and hypercapnic respiratory challenges.

Methods

In seven patients with different intracranial tumours, cerebral R2* changes during carbogen and CO2/air inhalation were monitored at 3 T using a dynamic multigradient-echo sequence of high temporal and spatial resolution. The R2* time series of each voxel was tested for significant change. Regions of interest were analysed with respect to response amplitude and velocity.

Results

The tumours showed heterogeneous R2* responses with large interindividual variability. In the ‘contrast-enhancing’ area of five patients and in the ‘non-tumoral’ tissue most voxels showed a decrease in R2* for carbogen. For the ‘contrast-enhancing’ area of two patients hardly any responses were found. In areas of ‘necrosis’ and perifocal ‘oedema’ typically voxels with R2* increase and no response were found for both gases. For tissue responding to CO2/air, the R2* changes were of the same order of magnitude as those for carbogen. The response kinetic was generally attenuated in tumoral tissue.

Conclusion

The spatially resolved determination of R2* changes reveals the individual heterogeneous response characteristic of intracranial human tumours during hyperoxic and hypercapnic respiratory challenges.
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Metadaten
Titel
Analysing the response in R2* relaxation rate of intracranial tumours to hyperoxic and hypercapnic respiratory challenges: initial results
verfasst von
A. Müller
S. Remmele
I. Wenningmann
H. Clusmann
F. Träber
S. Flacke
R. König
J. Gieseke
W. A. Willinek
H. H. Schild
P. Mürtz
Publikationsdatum
01.04.2011
Verlag
Springer-Verlag
Erschienen in
European Radiology / Ausgabe 4/2011
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-010-1948-7

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Akuter Schwindel stellt oft eine diagnostische Herausforderung dar. Wie nützlich dabei eine MRT ist, hat eine Studie aus Finnland untersucht. Immerhin einer von sechs Patienten wurde mit akutem ischämischem Schlaganfall diagnostiziert.

Screening-Mammografie offenbart erhöhtes Herz-Kreislauf-Risiko

26.04.2024 Mammografie Nachrichten

Routinemäßige Mammografien helfen, Brustkrebs frühzeitig zu erkennen. Anhand der Röntgenuntersuchung lassen sich aber auch kardiovaskuläre Risikopatientinnen identifizieren. Als zuverlässiger Anhaltspunkt gilt die Verkalkung der Brustarterien.

Update Radiologie

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