Impact of respiratory-correlated CT sorting algorithms on the choice of margin definition for free-breathing lung radiotherapy treatments.

Détails

ID Serval
serval:BIB_BC29DC8704FC
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Impact of respiratory-correlated CT sorting algorithms on the choice of margin definition for free-breathing lung radiotherapy treatments.
Périodique
Radiotherapy and Oncology
Auteur(s)
Thengumpallil S., Germond J.F., Bourhis J., Bochud F., Moeckli R.
ISSN
1879-0887 (Electronic)
ISSN-L
0167-8140
Statut éditorial
Publié
Date de publication
2016
Peer-reviewed
Oui
Volume
119
Numéro
3
Pages
438-443
Langue
anglais
Notes
Publication types: Journal Article
Résumé
BACKGROUND AND PURPOSE: To investigate the impact of Toshiba phase- and amplitude-sorting algorithms on the margin strategies for free-breathing lung radiotherapy treatments in the presence of breathing variations.
MATERIAL AND METHODS: 4D CT of a sphere inside a dynamic thorax phantom was acquired. The 4D CT was reconstructed according to the phase- and amplitude-sorting algorithms. The phantom was moved by reproducing amplitude, frequency, and a mix of amplitude and frequency variations. Artefact analysis was performed for Mid-Ventilation and ITV-based strategies on the images reconstructed by phase- and amplitude-sorting algorithms. The target volume deviation was assessed by comparing the target volume acquired during irregular motion to the volume acquired during regular motion.
RESULTS: The amplitude-sorting algorithm shows reduced artefacts for only amplitude variations while the phase-sorting algorithm for only frequency variations. For amplitude and frequency variations, both algorithms perform similarly. Most of the artefacts are blurring and incomplete structures. We found larger artefacts and volume differences for the Mid-Ventilation with respect to the ITV strategy, resulting in a higher relative difference of the surface distortion value which ranges between maximum 14.6% and minimum 4.1%.
CONCLUSIONS: The amplitude- is superior to the phase-sorting algorithm in the reduction of motion artefacts for amplitude variations while phase-sorting for frequency variations. A proper choice of 4D CT sorting algorithm is important in order to reduce motion artefacts, especially if Mid-Ventilation strategy is used.
Pubmed
Web of science
Création de la notice
30/07/2016 11:02
Dernière modification de la notice
20/08/2019 15:30
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