Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Dosimetric Characterization of Small Radiation Therapy Electron Beams Collimated by Tubular Applicators With the New Micro-Silicon Detector

Serenella Russo
* ,
Silvia Bettarini
* ORCID logo ,
Barbara Grilli Leonulli
,
Marco Esposito
,
Paolo Alpi
,
Alessandro Ghirelli
,
Raffaella Barca
,
Simona Fondelli
,
Lisa Paoletti
,
Silvia Pini
,
Silvia Scoccianti
Version 1 : Received: 11 December 2021 / Approved: 14 December 2021 / Online: 14 December 2021 (15:55:57 CET)

A peer-reviewed article of this Preprint also exists.

Russo, S.; Bettarini, S.; Grilli Leonulli, B.; Esposito, M.; Alpi, P.; Ghirelli, A.; Barca, R.; Fondelli, S.; Paoletti, L.; Pini, S.; Scoccianti, S. Dosimetric Characterization of Small Radiotherapy Electron Beams Collimated by Circular Applicators with the New Microsilicon Detector. Appl. Sci. 2022, 12, 600. Russo, S.; Bettarini, S.; Grilli Leonulli, B.; Esposito, M.; Alpi, P.; Ghirelli, A.; Barca, R.; Fondelli, S.; Paoletti, L.; Pini, S.; Scoccianti, S. Dosimetric Characterization of Small Radiotherapy Electron Beams Collimated by Circular Applicators with the New Microsilicon Detector. Appl. Sci. 2022, 12, 600.

Abstract

High-energy small electron beams generated by linear accelerators are used for radiotherapy of localized superficial tumors. The aim of the present study is to assess the dosimetric performance under small radiation therapy electron beams of the novel PTW microSilicon detector by comparison with commercially available dosimeters. Relative dose measurements of circular fields with 20, 30, 40 and 50 mm aperture diameters were performed for 4 to 12 MeV energy range of electron beams generated by an Elekta Synergy linac. Percentage depth dose, transverse profiles and output factors normalized to the 10 × 10 cm2 reference field were measured. All dosimetric data were collected in a PTW MP3 motorized water phantom at SSD of 100cm by using the novel PTW microSilicon detector. The PTW diode E and the PTW microDiamond were also used in all beam aperture for benchmarking. Data for the biggest field size were also measured by the PTW Advanced Markus ionization chamber.Measurements performed by the microSilicon are in good agreement with the reference values for all the tubular applicators and beam energies, within the stated uncertainties. This confirms the reliability of the microSilicon detector for relative dosimetry of small radiation therapy electron beams collimated by tubular applicators.

Keywords

radiotherapy electron beams; output factors; tubular applicator; solid-state detector

Subject

Physical Sciences, Radiation and Radiography

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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