Journal article
Comparison of catheter reconstruction techniques for the lunar ovoid channels of the Venezia (TM) applicator
Journal of contemporary brachytherapy, Vol.12(4), pp.383-392
01/01/2020
DOI: 10.5114/jcb.2020.98119
PMCID: PMC7690228
PMID: 33293978
Abstract
Purpose: The aim of this study was to compare catheter reconstruction methods for lunar ovoid channels of the Venezia (TM) advanced gynecological applicator (Elekta, Sweden).
Material and methods: Three available lunar ovoid sizes (22, 26, and 30 mm effective diameter) were evaluated. Computed tomography (CT) scans were performed with a dummy wire inserted and with the Flexitron (R) source position simulator (SPS) at step sizes of 5 mm from the most distal dwell position. Treatment plans were generated in Oncentra (R) (version 4.5.3) with different catheter reconstruction techniques: centerline reconstruction, tracing a CT dummy wire, using a source path model provided by Elekta, and using the SPS at each planning dwell position. Source position agreement was assessed in registered CT images, and dose differences were calculated with the SPS-based treatment plan as a reference. Finally, dose-volume histogram (DVH) parameters were evaluated for clinical plans with the Venezia (TM) applicator.
Results: For the most distal dwell position, the manufacturer's model had the closest agreement with the SPS at 0.6 +/- 0.3 mm across applicator sizes. Relative to the SPS, maximal dose differences outside of the applicator were between 16-39% for a 0.1 cm(3) volume and 3.6-9.1% for a 2.0 cm(3) volume. For two clinical plans, volume-based DVH parameters agreed <= 3.9%, while deviations <= 5.3% were seen for point metrics.
Conclusions: Relative to the SPS-based plan, large local dose discrepancies were reduced, but not eliminated, using the manufacturer's source path model. The choice of reconstruction technique was found to have relatively limited impact on DVH parameters for regions outside of the vaginal mucosa.
Details
- Title: Subtitle
- Comparison of catheter reconstruction techniques for the lunar ovoid channels of the Venezia (TM) applicator
- Creators
- Jon Hansen - University of Wisconsin–MadisonDavid Dunkerley - University of Wisconsin–MadisonKristin Bradley - University of Wisconsin–MadisonJessica Miller - University of Wisconsin–MadisonJessie Huang - University of Wisconsin–Madison
- Resource Type
- Journal article
- Publication Details
- Journal of contemporary brachytherapy, Vol.12(4), pp.383-392
- DOI
- 10.5114/jcb.2020.98119
- PMID
- 33293978
- PMCID
- PMC7690228
- NLM abbreviation
- J Contemp Brachytherapy
- ISSN
- 1689-832X
- eISSN
- 2081-2841
- Publisher
- Termedia Publishing House Ltd
- Number of pages
- 10
- Language
- English
- Date published
- 01/01/2020
- Academic Unit
- Radiation Oncology
- Record Identifier
- 9984312970002771
Metrics
27 Record Views