Contrast-enhanced dual-energy CT of gastrointestinal stromal tumors: is iodine-related attenuation a potential indicator of tumor response? - Apfaltrer, Paul; Meyer, Mathias; Meier, Caroline; Henzler, Thomas; Dinter, Dietmar; Hohenberger, Peter; Schönberg, Stefan; Fink, Christian (Investigative radiology, 2012)