Positional and angular tracking of HDR
HDR
brachytherapy
quality assurance
radiochromic film
source tracking
Journal
Medical physics
ISSN: 2473-4209
Titre abrégé: Med Phys
Pays: United States
ID NLM: 0425746
Informations de publication
Date de publication:
Dec 2020
Dec 2020
Historique:
received:
11
05
2020
revised:
31
08
2020
accepted:
25
09
2020
pubmed:
17
10
2020
medline:
15
5
2021
entrez:
16
10
2020
Statut:
ppublish
Résumé
To quantify and verify the dosimetric impact of high-dose rate (HDR) source positional uncertainty in brachytherapy, and to introduce a model for three-dimensional (3D) position tracking of the HDR source based on a two-dimensional (2D) measurement. This model has been utilized for the development of a comprehensive source quality assurance (QA) method using radiochromic film (RCF) dosimetry including assessment of different digitization uncertainties. An algorithm was developed and verified to generate 2D dose maps of the mHDR-V2 The maximum measured dosimetric variations on the 6F and 4F catheter surfaces were 39.8% and 36.1%, respectively. At 10 mm further, the variation reduced to 2.6% for the 4F catheter which is in agreement with the calculations. The source center (x, y) was strongly correlated with the low IDL-weighted centroid (PCC = 0.99), while the distance to source (z) was correlated with the IDL areas (PCC = 0.96) and perimeters (PCC = 0.99). The source orientation θ Isodose line features of a 2D dose map away from the HDR source can reveal its spatial coordinates. RCF was shown to be a suitable dosimeter for source tracking and dosimetry. This technique offers a novel source QA method and has the potential to be used for QA of commercial and customized applicators.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
6122-6139Subventions
Organisme : Gouvernement du Canada | Natural Sciences and Engineering Research Council of Canada (NSERC)
ID : 386009
Organisme : Gouvernement du Canada | Natural Sciences and Engineering Research Council of Canada (NSERC)
ID : 432290
Organisme : King Faisal Specialist Hospital and Research Centre (King Faisal Specialist Hospital)
ID : 38/75
Informations de copyright
© 2020 American Association of Physicists in Medicine.
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