Dual Energy CT: Basic Principles -- Dual Energy CT: Post-Processing and Image Analysis Strategies in Oncologic Imaging -- Dual Energy CT of Head and Neck Tumors -- Dual Energy CT of Lung Tumors -- Dual Energy CT of Liver Tumors -- Dual Energy CT of Pancreatic Tumors -- Dual Energy CT of Gastrointestinal Tumors -- Dual Energy CT of Genitourinary Tumors -- Dual Energy CT of Musculoskeletal Tumors.