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Experience from long-term monitoring of RAKR ratios in Ir-192 brachytherapy
Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.
Karolinska University Hospital.
Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Health Sciences, Radiation Physics .
Karolinska University Hospital.
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2008 (English)In: Radiotherapy and Oncology, ISSN 0167-8140, Vol. 89, no 2, 217-221 p.Article in journal (Refereed) Published
Abstract [en]

Background: Ratios of values of brachytherapy source strengths, as measured by hospitals and vendors, comprise constant differences as, e.g., systematic errors in ion chamber calibration factors and measurement setup. Such ratios therefore have the potential to reveal the systematic changes in routines or calibration services at either the hospital or the vendor laboratory, which could otherwise be hidden by the uncertainty in the source strength values.

Methods: The RAKR of each new source in 13 afterloading units at five hospitals were measured by well-type ion chambers and compared to values for the same source stated on vendor certificates.

Results: Differences from unity in the ratios of RAKR values determined by hospitals and vendors are most often small and stable around their mean values to within +/- 11.5%. Larger deviations are rare but occur. A decreasing ratio, seen at two hospitals for the same source, was useful in detecting an erroneous pressure gauge at the vendors site.

Conclusions: Establishing a mean ratio of RAKR values, as measured at the hospital and supplied on the vendor certificate, and monitoring this as a function of time are an easy way for the early detection of problems with equipment or routines at either the hospital or the vendor site.

Place, publisher, year, edition, pages
2008. Vol. 89, no 2, 217-221 p.
Keyword [en]
Ir-192, HDR, PDR, Reference air-kerma rate
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-16181DOI: 10.1016/j.radonc.2008.07.024OAI: oai:DiVA.org:liu-16181DiVA: diva2:133365
Available from: 2009-01-09 Created: 2009-01-09 Last updated: 2009-08-17

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Carlsson Tedgren, ÅsaHedtjärn, Håkan

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