[en] PC aided quality assurance in radiotherapy. A quality assurance (QA) program in radiation dosimetry is a series of planned, systematic actions to ensure that the radiotherapy treatments are indeed performed according to the present state of art. The whole radiotherapeutic process covers mainly two different aspects: prescriptions and the execution of treatment. In practice QA is typical routine work which should consist of a range of simple and well defined individual operations. These operations must be regularly performed and therefore are ready to be done on a PC. A QA package is under development at our institute in co-operation with other radiotherapy departments which will cover the QA from the physical and technical point of view. It is based on the recommendations given in our national protocol used at present and on some improvements which are prepared for the new one. The QA package will cover all necessary tests which are performed at fully equipped radiotherapy departments and they are discussed in this paper. (author). 19 refs, 1 fig, 3 tabs