Open AccessComparing the dosimetric characteristics of the electron beam from dedicated intraoperative and conventional radiotherapy accelerators
Author(s) -
Baghani Hamid Reza,
Aghamiri Seyed Mahmoud Reza,
Mahdavi Seyed Rabi,
Akbari Mohammad Esmail,
Mirzaei Hamid Reza
Publication year - 2015
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1120/jacmp.v16i2.5017
Subject(s) - beam (structure) , collimated light , linear particle accelerator , radiation therapy , nuclear medicine , cathode ray , dosimetry , external beam radiotherapy , optics , medical physics , materials science , medicine , physics , electron , radiology , nuclear physics , brachytherapy , laser
The specific design of the mobile dedicated intraoperative radiotherapy (IORT) accelerators and different electron beam collimation system can change the dosimetric characteristics of electron beam with respect to the conventional accelerators. The aim of this study is to measure and compare the dosimetric characteristics of electron beam produced by intraoperative and conventional radiotherapy accelerators. To this end, percentage depth dose along clinical axis (PDD), transverse dose profile (TDP), and output factor of LIAC IORT and Varian 2100C/D conventional radiotherapy accelerators were measured and compared. TDPs were recorded at depth of maximum dose. The results of this work showed that depths of maximum dose, R 90 , R 50 , and R P for LIAC beam are lower than those of Varian beam. Furthermore, for all energies, surface doses related to the LIAC beam are substantially higher than those of Varian beam. The symmetry and flatness of LIAC beam profiles are more desirable compared to the Varian ones. Contrary to Varian accelerator, output factor of LIAC beam substantially increases with a decrease in the size of the applicator. Dosimetric characteristics of beveled IORT applicators along clinical axis were different from those of the flat ones. From these results, it can be concluded that dosimetric characteristics of intraoperative electron beam are substantially different from those of conventional clinical electron beam. The dosimetric characteristics of the LIAC electron beam make it a useful tool for intraoperative radiotherapy purposes. PACS number: 87.56.‐v, 87.56.bd