High Resolution Susceptibility Weighted MR-Imaging of Brain Tumors during the Application of a Gaseous Agent

Zusammenfassung

Ziel: Eine räumlich hochaufgelöste BOLD-basierte MR-Methode, die so genannte suszeptibilitätsgewichtete Bildgebung (SWI), wurde zur Untersuchung des Einflusses von Karbogen auf zerebrale Tumoren und zur Beurteilung der Tumoranatomie eingesetzt. Material und Methoden: Fünf Patienten mit zerebralen Tumoren (vier Glioblastome, ein Astrozytom Grad II) wurden während Luft- und Karbogenatmung mit einer in erster Ordnung flusskompensierten 3D-Gradientenechosequenz (TE = 45 ms, TR = 67 ms, α = 25°, FOV = 256 × 192 × 64 mm³, typische Matrix = 512 × 192 × 64) auf einem 1,5 T MR untersucht. Die Signaländerungen zwischen den beiden Atembedingungen wurden bestimmt. Ergebnisse: Die Glioblastome zeigten starke, aber auch sehr heterogene Signaländerungen zwischen + 22,5 ± 4,9 % in Randbereichen und - 5,0 ± 0,4 % im Umgebungsödem. Das Astrozytom zeigte eine Signalabnahme während der Karbogenatmung von - 3,1 ± 0,1 % im Tumorzentrum und - 4,1 ± 0,1 % bis - 6,8 ± 0,3 % im peritumorösen Gewebe mit T₂-Hyperintensität. Schlussfolgerungen: SWI ermöglicht eine detaillierte Darstellung der zerebralen Anatomie und venösen Vaskularisierung und erlaubt mit Hilfe von Karbogen eine räumlich hochaufgelöste lokale Untersuchung zur Tumoraktivität.

Abstract

Purpose: To employ a high resolution blood oxygenation level dependent (BOLD) method called susceptibility weighted imaging (SWI) together with the breathing of carbogen to investigate the response of cerebral tumors to this breathing gas and to assess tumor anatomy at high resolution. Methods: Five patients with cerebral tumors (four glioblastoma multiforme, one astrocytoma [WHO grade II]) were studied using a susceptibility weighted 3D gradient echo, first order velocity compensated sequence (TE = 45 ms, TR = 67 ms, α = 25°, FOV = 256 × 192 × 64 mm³, typical matrix = 512 × 192 × 64), on a 1.5 T MR scanner while they were breathing air and carbogen. Signal changes between the two breathing conditions were investigated. Results: The glioblastomas showed strong but heterogeneous signal changes between carbogen and air breathing, with changes between + 22.4 ± 4.9 % at the perimeter of the tumors and - 5.0 ± 0.4 % in peritumoral areas that appeared hyperintense on T₂-weighted images. The astrocytoma displayed a signal decrease during carbogen breathing (- 4.1 ± 0.1 % to - 6.8 ± 0.3 % in peritumoral areas that correspond to hyperintense regions on T₂-weighted images, and - 3.1 ± 0.1 % in the tumor-center). Conclusions: SWI provides high resolution images of cerebral anatomy and venous vascularization. Combined with hypercapnia it allows for regional assessment of tumor activity.

Key words

MRI - SWI - hypercapnia - BOLD - tumors

References

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