Verification and uniformity control of doses for Sr-90/ Y-90 intravascular brachytherapy sources using radiochromic film dosimetry


DEMİR B. , Ahmed A. S. , Babalik E., DEMİR M., Gurmen T. K.

JOURNAL OF MEDICAL PHYSICS, vol.33, no.2, pp.54-59, 2008 (Journal Indexed in ESCI) identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 2
  • Publication Date: 2008
  • Doi Number: 10.4103/0971-6203.41193
  • Journal Name: JOURNAL OF MEDICAL PHYSICS
  • Journal Indexes: Emerging Sources Citation Index, Scopus
  • Page Numbers: pp.54-59
  • Keywords: Sr-90/ Y-90, intravascular brachytherapy, radiochromic film dosimetry

Abstract

Intravascular brachytherapy (IVBT) is a useful treatment modality for the recurrence of in-stent restenosis following drug-eluting stents (DES) or IVBT failure. The objective of this study was to measure the dose rate of Sr-90/Y-90 IVBT sources for comparison with that given by the manufacturer and to control the dose uniformities of these sources along the source axis. The dose rates of Sr-90/Y-90 beta sources were measured with a radiochromic film in a custom-made phantom. The films for calibration were irradiated using Co-60 photon beams. The results for the three sources were 4.5%, 2.3%, and 3.5% higher than the corresponding certificate values. Maximum and minimum of the dose rates varied within +/- 10% of those at source center; and maximum dose discrepancy for the first Sr-90/Y-90 source train was 8.2%; for the second source train, 7.1%; and for the third source train, 5.1%. Our study showed that the dose rates given by the manufacturer for the three Sr-90/Y-90 IVBT sources were reliable and dose uniformities were within +/- 10% along two thirds of the treatment length.