False lumen hemodynamics is an important factor in aortic dissection progression. As a methodology to further characterize false lumen velocities, two patient-specific 3D printed models underwent 4D Flow MRI, from which histograms of velocity components were generated at several locations along the lumen. Two VENC settings were used and the data was grouped in diastole and systole. Histograms of normal and tangential components serve as descriptors of flow regimes and offer the possibility to correlate with thrombus formation and clinical progression. VENC is important especially for the assessment of tangential components.