[Current problems of topometric irradiation planning]

Starting from the chain of single steps in radiotherapy, the requirements of topometrical treatment planning are defined and current directions of development for the improvement of accuracy and clearness of treatment plans are shown. By far not all the possibilities of ultrasound tomography (UST) and NMR-tomography for use in radiotherapy have been clarified up to now. Particularly in case of UST the range of application in radiotherapy can be essentially widened due to technical developments. Computerized tomography (CT) today holds a very important place in radiotherapy. In the centre of current interest are simulators able to produce CT and computerized tomographs with the possibility to use them as simulators. Pinpointing some of such developments, the importance of three-dimensional treatment planning with its diverse possibilities is detailed. They put the physician and the physicist in a position to imagine and to interpret quickly and effectively the enormous variety of data in treatment planning.