Quantitative assessment of P-glycoprotein function in the rat blood-brain barrier by distribution volume of [11C]verapamil measured with PET. - Joost Bart; Antoon T. M. Willemsen; Harry J. M. Groen; Winette T. A. van der Graaf; Theodora D. Wegman; Willem Vaalburg; Elisabeth G. E. de Vries; N. Harry Hendrikse (NeuroImage, 2003)