We report on our experience with model-based testing using SpecExplorer within the Flat X-Ray Detection (FXD) Department of Philips Healthcare. Our initial experiments showed a practical obstacle in combining traditional functional testing techniques with model-based testing using SpecExplorer. We overcome this obstacle by specifying the constraints on our data domain in a spreadsheet and interfacing SpecExplorer with a constraint solver in order to generate concrete test data for the behavioral specifications. We report on some empirical results obtained from our experiments.