[Practical application of digital therapy verification]

The following describes the technical details which are of importance preparing portal radiographs using digital luminescence radiography. There are some advantages to this method: In comparison with the conventional portal radiographs using a low speed film, the new doses is ten to thirty times less than generally required. Double exposure techniques can be more easily applied than with conventional portal films. The contrast may be subsequently manipulated. In addition the dynamic range of the radiation detector is automatically adjusted to the exposure range. These facts may improve the verification quality. However, there are also some disadvantages: You need more apparatus, and the whole procedure is more time-consuming. Using typical examples we shall compare the procedure of digital portal radiographs and its results to traditional techniques.