A fiber-optic twin sensor for dose measurements in radiation therapy

The developed fiber-optic twin sensor allowsin- vivo dose measurement in the tissue of the patient’s body. It consists of two radiation-sensitive fibers. The radiation-induced attenuations of these fibers are used to determine the dose absorbed in tissue. The two signals have a linear dose response, but they depend differently on the energy of the ionizing radiation. Evaluation of the two sensor signals permits a nearly tissue-equivalent dose indication.