Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2008  |  Volume : 33  |  Issue : 2  |  Page : 54-59

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


1 Department of Physics, Faculty of Science, Istanbul University, Istanbul, Turkey
2 Department of Nuclear Medicine, Cerrahpasa Medical Faculty, Istanbul University, Istanbul, Turkey
3 Department of Cardiology, Cerrahpasa Medical Faculty, Istanbul University, Istanbul, Turkey
4 Institute of Cardiology, Istanbul University, Istanbul, Turkey

Correspondence Address:
Bayram Demir
Department of Physics, Faculty of Science, Istanbul University, Istanbul
Turkey
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.41193

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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 90 Sr/ 90 Y 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 90 Sr/ 90 Y beta sources were measured with a radiochromic film in a custom-made phantom. The films for calibration were irradiated using 60 Co 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 90 Sr/ 90 Y 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 90 Sr/ 90 Y IVBT sources were reliable and dose uniformities were within 10% along two thirds of the treatment length.


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