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Experience from long-term monitoring of RAKR ratios in Ir-192 brachytherapy
Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik. Östergötlands Läns Landsting, Kirurgi- och onkologicentrum, Radiofysikavdelningen.
Karolinska University Hospital.
Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik.
Karolinska University Hospital.
Vise andre og tillknytning
2008 (engelsk)Inngår i: Radiotherapy and Oncology, ISSN 0167-8140, E-ISSN 1879-0887, Vol. 89, nr 2, s. 217-221Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2008. Vol. 89, nr 2, s. 217-221
Emneord [en]
Ir-192, HDR, PDR, Reference air-kerma rate
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-16181DOI: 10.1016/j.radonc.2008.07.024OAI: oai:DiVA.org:liu-16181DiVA, id: diva2:133365
Tilgjengelig fra: 2009-01-09 Laget: 2009-01-09 Sist oppdatert: 2017-12-14

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