In vivo dosimetry with MOSFETs: Dosimetric characterization and first clinical results in intraoperative radiotherapy

Rita Consorti, Assunta Petrucci, Falbo Fortunato, Antonella Soriani, Simona Marzi, Giuseppe Iaccarino, Valeria Landoni, Marcello Benassi

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Purpose: To investigate the use of metal oxide silicon field effect transistors (MOSFETs) as in vivo dosimetry detectors during electron beams at high dose-per-pulse intraoperative radiotherapy. Methods and Materials: The MOSFET system response in terms of reproducibility, energy, dose rate and temperature dependence, dose-linearity from 1 to 25 Gy, angular response, and dose perturbation was analyzed in the 6-9-MeV electron beam energy range produced by an intraoperative radiotherapy-dedicated mobile accelerator. We compared these with the 6- and 9-MeV electron beams produced by a conventional accelerator. MOSFETs were also used in clinical dosimetry. Results: In experimental conditions, the overall uncertainty of the MOSFET response was within 3.5% (±SD). The investigated electron energies and the dose rate did not significantly influence the MOSFET calibration factors. The dose perturbation was negligible. In vivo dosimetry results were in accordance with the predicted values within ±5%. A discordance occurred either for an incorrect position of the dosimeter on the patient or when a great difference existed between the clinical and calibration setup, particularly when performing exit dose measurements. Conclusion: Metal oxide silicon field effect transistors are suitable for in vivo dosimetry during intraoperative radiotherapy because their overall uncertainty is comparable to the accuracy required in target dose delivery.

Original languageEnglish
Pages (from-to)952-960
Number of pages9
JournalInternational Journal of Radiation Oncology Biology Physics
Volume63
Issue number3
DOIs
Publication statusPublished - Nov 1 2005

Fingerprint

silicon transistors
Silicon
Oxides
dosimeters
metal oxides
radiation therapy
Radiotherapy
field effect transistors
Metals
dosage
Electrons
Calibration
Uncertainty
electron beams
accelerators
perturbation
In Vivo Dosimetry
linearity
delivery
Temperature

Keywords

  • High dose-per-pulse
  • In vivo dosimetry
  • IORT
  • MOSFET

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiation

Cite this

In vivo dosimetry with MOSFETs : Dosimetric characterization and first clinical results in intraoperative radiotherapy. / Consorti, Rita; Petrucci, Assunta; Fortunato, Falbo; Soriani, Antonella; Marzi, Simona; Iaccarino, Giuseppe; Landoni, Valeria; Benassi, Marcello.

In: International Journal of Radiation Oncology Biology Physics, Vol. 63, No. 3, 01.11.2005, p. 952-960.

Research output: Contribution to journalArticle

Consorti, Rita ; Petrucci, Assunta ; Fortunato, Falbo ; Soriani, Antonella ; Marzi, Simona ; Iaccarino, Giuseppe ; Landoni, Valeria ; Benassi, Marcello. / In vivo dosimetry with MOSFETs : Dosimetric characterization and first clinical results in intraoperative radiotherapy. In: International Journal of Radiation Oncology Biology Physics. 2005 ; Vol. 63, No. 3. pp. 952-960.
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