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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
A multicentre comparison of the dosimetric impact of inter- and intra-fractional anatomical variations in fractionated cervix cancer brachytherapy
Radiotherapy and Oncology, Volume 107, No. 1, Year 2013
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Description
Background and purpose: To compare the dosimetric impact of organ and target variations relative to the applicator for intracavitary brachytherapy by a multicentre analysis with different application techniques and fractionation schemes. Material and methods: DVH data from 363 image/contour sets (120 patients, 6 institutions) were included for 1-6 fractions per patient, with imaging intervals ranging from several hours to ∼20 days. Variations between images acquired within one (intra-application) or between consecutive applicator insertions (inter-application) were evaluated. Dose plans based on a reference MR or CT image series were superimposed onto subsequent image sets and D2cm3 for the bladder, rectum and sigmoid and D 90 for HR CTV were recorded. Results: For the whole sample, the systematic dosimetric variations for all organs at risk, i.e. mean variations of D2cm3, were found to be minor (<5%), while random variations, i.e. standard deviations were found to be high due to large variations in individual cases. The D2cm3 variations (mean ± 1SD) were 0.6 ± 19.5%, 4.1 ± 21.7% and 1.6 ± 26.8%, for the bladder, rectum and sigmoid. For HR CTV, the variations of D90 were found to be -1.1 ± 13.1% for the whole sample. Grouping of the results by intra- and inter-application variations showed that random uncertainties for bladder and sigmoid were 3-7% larger when re-implanting the applicator for individual fractions. No statistically significant differences between the two groups were detected in dosimetric variations for the HR CTV. Using 20% uncertainty of physical dose for OAR and 10% for HR CTV, the effects on total treatment dose for a 4 fraction HDR schedule at clinically relevant dose levels were found to be 4-8 Gy EQD2 for OAR and 3 Gy EQD2 for HR CTV. Conclusions: Substantial variations occur in fractionated cervix cancer BT with higher impact close to clinical threshold levels. The treatment approach has to balance uncertainties for individual cases against the use of repetitive imaging, adaptive planning and dose delivery. © 2013 Elsevier Ireland Ltd. All rights reserved.
Authors & Co-Authors
Nesvacil, Nicole
Austria, Vienna
Medizinische Universität Wien
Tanderup, Kari
Denmark, Aarhus
Aarhus Universitetshospital
Hellebust, Taran P.
Norway, Oslo
Oslo Universitetssykehus
Norway, Oesteraas
Norwegian Radiation and Nuclear Safety Authority Dsa
Norway, Oslo
Universitetet I Oslo
De Leeuw, Astrid
Netherlands, Utrecht
University Medical Center Utrecht
Lang, Stefan
Austria, Vienna
Medizinische Universität Wien
Mohamed, Sandy Mohamed Ismail
Denmark, Aarhus
Aarhus Universitetshospital
Egypt, Giza
Cairo University
Swamidas, Jamema
India, Mumbai
Tata Memorial Hospital
Anderson, Clare
United Kingdom, Stevenage
East and North Hertfordshire Nhs Trust
Pötter, Richard
Austria, Vienna
Medizinische Universität Wien
Kirisits, Christian
Austria, Vienna
Medizinische Universität Wien
Statistics
Citations: 93
Authors: 10
Affiliations: 9
Identifiers
Doi:
10.1016/j.radonc.2013.01.012
e-ISSN:
18790887
Research Areas
Cancer
Health System And Policy