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Radiation Protection Dosimetry Advance Access originally published online on June 7, 2005
Radiation Protection Dosimetry 2005 114(4):514-523; doi:10.1093/rpd/nch496
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Patient and personnel dosimetry in endovascular radiotherapy with 90Sr/90Y sources

J. Kalef-Ezra1,*, G. Bozios1, P. Tsekeris2 and L. Michalis3

1 Department of Medical Physics, University of Ioannina, 45110 Ioannina, Greece
2 Department of Radiation Therapy, University of Ioannina, 45110 Ioannina, Greece
3 Department of Cardiology, Medical School, University of Ioannina, 45110 Ioannina, Greece

* Corresponding author: jkalef{at}cc.uoi.gr

Received September 8, 2004, amended February 21, 2005, accepted April 17, 2005

Endovascular brachytherapy (EVBT) is an established treatment to reduce the probability of restenosis after a percutaneous coronary intervention. The purpose of this study was to assess (1) the manufacturer's stated dosimetric data for 90Sr/90Y source trains to be used in EVBT and (2) the procedure-related radiation burden. The radiation fields in water around six 90Sr/90Y source trains were studied using phantoms made of ‘solid water’ and MD55-2 radiochromic films. The water equivalence of the phantom material was tested by applying quantitative computed tomography. Thermoluminescence dosemeters were used to assess personal radiation burden and crosscheck the dose distribution along the source trains. Technical failure was observed in one source train and this train was excluded from analysis. The measured dose rate in water at 2 mm radial distance was on average 8% higher than the manufacture's stated value (range of measured to stated values 1.05–1.15). The dose rate decreased exponentially with radial distance between 2 and 6 mm. The dose rate in contact with the source viewing window of the delivery devices ranged between 0.5 and 7.5 mGy h–1. Low-energy photons were the main contributors to personal dose.


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