Purpose/Objective: The complexity of radiotherapy treatments due to the rapid technological progress, demands an accurate quality assurance(QA) program and dose verification procedure. In this work the authors present MAESTRO:a monolithic epitaxial silicon detector of high spatial resolution. The device was thought as a dosimeter for Intensity Modulated Radiation Therapy. This work describes the dosimetric characterization of this device and eventually reports the comparisons with a commercial 2Ddosimeter in the routinely dosimetric QA of a clinical head IMRT plan. Materials and Methods: The dosimeter is based on a monolithic epitaxial silicon segmented module with 6.3x6.3cm2 active area, obtained from 4' p-type MCz wafers. Epitaxial layers with 50 μmthickness, are grown by ITME, Warsaw, Poland. A matrix of 21x21 pixels was chosen as best compromise between granularity and electronic complexity, with a 2x2 mm2 pixel area and a 3mm pitch. Large area IMRT may be covered by mosaic composition and/or shifting along x-y axes the single module. In this work, dosimetric maps for head-IMRT treatment measured with the MAESTRO device were compared with those obtained using the MapCHECK 2 diode matrix. MapCHECK 2 (SunNuclear) is a two- dimensional system for therapy beams: it contains 1527 n-type diode detectors arranged in a 32 x 26 cm2octagonal grid with a pitch of 7.07mm. A full dosimetric characterization of the devices was performed with photon and proton beams and with gammas from a Cobalt Unit. The QA of an IMRT clinical head treatment with nine photon beams was performed using an Elekta Synergy accelerator at the Careggi UniversityHospital. Results: Tests performed using X-ray, protonsand gamma from a cobalt unit constitute a comprehensive characterization of MAESTROdevice. The dosimetric properties of this prototype, are very good and quitecomparable with those of ionization chambers and commercial device.

Dosimetric characterization of a monolithic epitaxial silicon dosimeter for quality assurance in radiotherapy / C. Talamonti; M. Bruzzi; D. Menichelli; M. Scaringella; M. Zani; M. Bucciolini. - In: RADIOTHERAPY AND ONCOLOGY. - ISSN 0167-8140. - ELETTRONICO. - (2014), pp. 565-565.

Dosimetric characterization of a monolithic epitaxial silicon dosimeter for quality assurance in radiotherapy

TALAMONTI, CINZIA;BRUZZI, MARA;SCARINGELLA, MONICA;ZANI, MARGHERITA;BUCCIOLINI, MARTA
2014

Abstract

Purpose/Objective: The complexity of radiotherapy treatments due to the rapid technological progress, demands an accurate quality assurance(QA) program and dose verification procedure. In this work the authors present MAESTRO:a monolithic epitaxial silicon detector of high spatial resolution. The device was thought as a dosimeter for Intensity Modulated Radiation Therapy. This work describes the dosimetric characterization of this device and eventually reports the comparisons with a commercial 2Ddosimeter in the routinely dosimetric QA of a clinical head IMRT plan. Materials and Methods: The dosimeter is based on a monolithic epitaxial silicon segmented module with 6.3x6.3cm2 active area, obtained from 4' p-type MCz wafers. Epitaxial layers with 50 μmthickness, are grown by ITME, Warsaw, Poland. A matrix of 21x21 pixels was chosen as best compromise between granularity and electronic complexity, with a 2x2 mm2 pixel area and a 3mm pitch. Large area IMRT may be covered by mosaic composition and/or shifting along x-y axes the single module. In this work, dosimetric maps for head-IMRT treatment measured with the MAESTRO device were compared with those obtained using the MapCHECK 2 diode matrix. MapCHECK 2 (SunNuclear) is a two- dimensional system for therapy beams: it contains 1527 n-type diode detectors arranged in a 32 x 26 cm2octagonal grid with a pitch of 7.07mm. A full dosimetric characterization of the devices was performed with photon and proton beams and with gammas from a Cobalt Unit. The QA of an IMRT clinical head treatment with nine photon beams was performed using an Elekta Synergy accelerator at the Careggi UniversityHospital. Results: Tests performed using X-ray, protonsand gamma from a cobalt unit constitute a comprehensive characterization of MAESTROdevice. The dosimetric properties of this prototype, are very good and quitecomparable with those of ionization chambers and commercial device.
2014
C. Talamonti; M. Bruzzi; D. Menichelli; M. Scaringella; M. Zani; M. Bucciolini
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/951533
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact