• Investigative radiology · Oct 2002

    Pharmacokinetic modeling of Gd-DTPA extravasation in brain tumors.

    • Lutz Ludemann, Reinhard Wurm, and Claus Zimmer.
    • Department of Radiology and Neuroradiology, CCM Universitätsklinikum Charité, Berlin, Germany. lutz.luedemann@charite.de
    • Invest Radiol. 2002 Oct 1; 37 (10): 562-70.

    Rationale And ObjectivesThe endothelial permeability of brain tumors affecting the blood-brain barrier can be quantified using dynamic contrast enhanced MR imaging.Materials And MethodsThe dynamics of contrast medium (CM) exchange was investigated in 31 brain tumors (intra- and extra-axial) by fast repeated T1-weighted imaging in order to determine the exchange rates and saturation concentrations.ResultsThe analysis of CM exchange reveals two different transport processes from the blood into two separate interstitial subcompartments for intra- and extra-axial tumors, a rapid one with a transfer constant of 1/ =7.0 seconds and a slow one with 1/ =133.7 seconds. Highly significant differences exhibit gliomas and meningiomas with respect to the saturation concentrations of fast and slowly enhancing compartments.ConclusionsThe fast component is probably caused by extravasation into viable tissue (enhanced in meningiomas) while the slow one probably reflects increased diffusion distances into poorly perfused tissue such as necrotic areas in glioblastomas.

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