Due to its low costs, high inertness and applicability at thermal polarization, ﬂuorinated gases are promising tracers for imaging lung ventilation using fluorine magnetic resonance imaging. In this work, the joint reconstruction of proton density and 19F ventilation images in the human lung is shown. To exploit the structural similarity of both imaging modalities, a regularized reconstruction is used, minimizing the parallel level sets. Quantitative analysis of the reconstruction performance could be achieved by retrospective undersampling of data collected during a 2.5-minute breath hold. Furthermore, computation of VDP maps has been analyzed using joint reconstruction in three COPD patients.