Απεικονιστική επιβεβαίωση τοποθέτησης στην ακτινοθεραπεία Τραχήλου και Στοματικής κοιλότητας. Σφάλματα λόγω κίνησης.

Abstract

The subject of this undergraduate thesis is the image-guided set up of patients undergoing radiotherapy treatment for Head and Neck lesions. There is an extended analysis of the radiotherapy technics, immobilization devices and the errors that may occur in the process as well as the solutions to them. The main principles of matter irradiation in molecular level are adduced, in which the treatment of Head and Neck radiotherapy is based upon. Depending on the clinical situation, the radiotherapy treatment relies on electromagnetic or particle radiation. Furthermore, the significance of fractionation of the therapeutic dose is analyzed. Dose fractionation underlines the importance of errors, that are either systematic or random, in the immobilization process. In this thesis, the range of immobilization devices employed and the proper use of them are discussed as well as the role of the radiotherapy technician in order to assure the precision and the repeatability of the process. On-line mis-positioning data, based on daily 2D x-ray imaging, from a group of patients is analyzed to estimate the systematic and random errors and compare them with international guidelines.