Impact of rotational errors of whole pelvis on the dose of prostate-based image-guided radiotherapy to pelvic lymph nodes and small bowel in high-risk prostate cancer.
fiducial marker
image-guided radiotherapy (IGRT)
pelvic lymph nodes
prostate cancer
rotational errors
Journal
Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology
ISSN: 1507-1367
Titre abrégé: Rep Pract Oncol Radiother
Pays: Poland
ID NLM: 100885761
Informations de publication
Date de publication:
2021
2021
Historique:
received:
23
06
2021
accepted:
12
09
2021
entrez:
7
1
2022
pubmed:
8
1
2022
medline:
8
1
2022
Statut:
epublish
Résumé
The target volume increases when the prostate and pelvic lymph nodes (PLNs) are combined, and the fiducial markers (FMs) are placed at the edge of the irradiation field. Thus, the position of FMs may be changed by the rotational errors (REs) of "whole pelvis". The aim of this study was to examine the impact of REs of "whole pelvis" on the dose of FMs-based image-guided radiotherapy to the PLNs and the small bowel in prostate cancer including the PLNs. We retrospectively evaluated 10 patients who underwent prostate cancer radiotherapy involving the PLNs. The position of FMs was calculated from the radiographs obtained before and after the 6D correction of pelvic REs. We simulated the delivery dose considering the daily pelvic REs and calculated the difference from the planned dose in the D The position of FMs strongly correlated with the pelvic REs in the pitch direction (r = 0.7788). However, the mean delivered doses to PLNs for 10 patients were not significantly different from the planned doses (p = 0.625). Although the D The dosimetric effect of pelvic REs on the dose to PLNs and the small bowel was negligible during the treatment course.
Sections du résumé
BACKGROUND
BACKGROUND
The target volume increases when the prostate and pelvic lymph nodes (PLNs) are combined, and the fiducial markers (FMs) are placed at the edge of the irradiation field. Thus, the position of FMs may be changed by the rotational errors (REs) of "whole pelvis". The aim of this study was to examine the impact of REs of "whole pelvis" on the dose of FMs-based image-guided radiotherapy to the PLNs and the small bowel in prostate cancer including the PLNs.
MATERIALS AND METHODS
METHODS
We retrospectively evaluated 10 patients who underwent prostate cancer radiotherapy involving the PLNs. The position of FMs was calculated from the radiographs obtained before and after the 6D correction of pelvic REs. We simulated the delivery dose considering the daily pelvic REs and calculated the difference from the planned dose in the D
RESULT
RESULTS
The position of FMs strongly correlated with the pelvic REs in the pitch direction (r = 0.7788). However, the mean delivered doses to PLNs for 10 patients were not significantly different from the planned doses (p = 0.625). Although the D
CONCLUSION
CONCLUSIONS
The dosimetric effect of pelvic REs on the dose to PLNs and the small bowel was negligible during the treatment course.
Identifiants
pubmed: 34992862
doi: 10.5603/RPOR.a2021.0107
pii: rpor-26-6-906
pmc: PMC8726453
doi:
Types de publication
Journal Article
Langues
eng
Pagination
906-914Informations de copyright
© 2021 Greater Poland Cancer Centre.
Déclaration de conflit d'intérêts
Conflict of interest The authors have no conflicts of interest to declare that are relevant to the content of this article.
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