Using a TRAPS upstream transmission detector to verify multileaf collimator positions during dynamic radiotherapy delivery

L. Beck*, J. J. Velthuis, S. Fletcher, J. A. Haynes, R. F. Page

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

1 Citation (Scopus)

Abstract

With the advancement of high-precision radiotherapy and the increasing use of higher intensity beams, the risk to the patient increases should the radiotherapy machine malfunction. Hence more accurate treatment verification is required. In this paper we provide a solution for real-time monitoring of X-ray beams from radiotherapy linear accelerators using monolithic active pixel sensors. We show that leaf errors can be detected with high precision in static fields and IMRT step and shoot, and accurate leaf tracking is possible in Volumetric Modulated Arc Therapy. The prototype MAPS detector meets the criteria of 1% attenuation acceptable for clinical use.

Original languageEnglish
Article number108951
Number of pages8
JournalApplied Radiation and Isotopes
Volume156
Early online date31 Oct 2019
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • CMOS
  • MAPS
  • Image sensors
  • Oncology
  • Radiotherapy
  • Silicon radiation sensors
  • Silicon detectors

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