1. Understand how with use of recently developed dual-energy CT (DECT) techinque, the clinical utility of CT in the management of pulmonary diseases can be expanded.2. Understand how this technology provides novel insights into perfusion and ventilation not possible with conventional CT.3. Understand how use of virtual monochromatic imaging can lead to a new approach to pulmonary imaging.4. Be familiar with the protocols needed for the clinical application of DECT in the chest disease.