Meßverfahren und Sensor zur on-line-in-vivo-Bestimmung der gewebeäquivalenten Dosis bei der Strahlentherapie

摘要

The invention concerns a process and measuring device for determining the tissue-equivalent dose in radiotherapy. First, the radiation dose is measured according to the process at a site by at least two sensors i and j. The sensors are designed such that the associated measuring signals Si and Sj display different energy dependency of the detection sensitivity to ionizing radiation, a dose-independent quotient Qij = Si / Sj being formed from this difference. The tissue-equivalent dose D is then calculated from this dose-independent value. The advantages of this process are that the sensor material does not have to be adapted to the tissue and can therefore be freely selected, and the tissue-equivalent dose is determined highly accurately. The measuring device comprises three parallel fibre-optic sensors disposed equidistant in a plane, the outer sensors being identical and differing from the central sensor by differing energy dependency of the detection sensitivity to ionizing radiation.