A new study uses Functional Respiratory Imaging (FRI) to assess and compare the performance of a Metered Dose Inhaler (MDI) alone, an MDI with multiple brands of spacers, and a Dry Powdered Inhaler (DPI) alone. Using Functional Respiratory Imaging (FRI), the study explores the combined impact of inhaler mechanics, patient physiology and patient technique. Results suggest using an AeroChamber Plus* Flow-Vu* Spacer combined with an MDI results in superior medication delivery to the lungs, compared to the other spacer brands tested with MDIs, MDIs alone, and DPIs alone.