[Tridimensional irradiation planning with Philips TPS and ultrasound gray-scale tomography in the course of routine work (author's transl)].

Extent and location of the target volume as well as the optimum choice of radiation and field and the use of wedges or compensation filters are critical parameters with respect to the quality of a treatment plan. The latter should always take into account the individual topography, even if standard concepts can be applied in some cases. We feel that treatment planning in each patient would require too much of the staff's time. Therefore equipment that helps to save planning time is welcome, particularly if it increases the reliability of the final results. In this respect ultrasonic tomography is a useful tool for solving many problems. These will be described, discussed and compared with the advantages of computerized tomography, which is just being introduced.