- Quantitative 3D pulmonary MR-perfusion in patients with pulmonary arterial hypertension: Correlation with invasive pressure measurements. Ley, S., Mereles, D., Risse, F., Grünig, E., Ley-Zaporozhan, J., Tecer, Z., Puderbach, M., Fink, C., Kauczor, H.U. European journal of radiology (2007)