[Effects of electron radiation on lung tissue in the postoperative irradiation of breast carcinoma].

The changes in lung tissue density arrived during the postoperative irradiation of 21 patients between February, 1984 and March, 1985 were investigated by means of a computer tomograph type Medicor-Pfizer 0100. It was shown that the influence of ionizing radiation produced an increased density of the pulmonary tissue even in case of the most precise radiophysical plan and the optimum energy. In all cases the density measured by CT after the irradiation was higher than before radiotherapy. This might be a very early sign of radiogenic late effects. An adequate modification of the irradiation plan has therefore to be carried out in the manner of a feedback.