ERVIS TELHAJ, ERJONA BAKIU
KEYWORDS : in vivo dosimeters, calibration, semiconductors.
ABSTRACT :
The primary purpose of in vivo dosimetry in external beam radiotherapy is to assess clinically significant differences between the planned and delivered doses, to record the dose received by individual patients, and to evaluate the “useful amount” of the given dose expressed in Gy. The in vivo dosimeters employed are p-n type semiconductors. Before these dosimeters are used clinically to estimate the dose delivered to a patient, they must undergo calibration and evaluation in terms of dosimetry. By comparing the radiation doses produced by the linear accelerator and those detected on the patient’s surface with the theoretical results calculated by the treatment planning system, we obtain a clear picture of the effective radiation for external beam radiotherapy treatments. A more ambitious goal of in vivo dosimetry is to control the target dose to verify the exact amount of radiation delivered