Volumetric-modulated arc therapy planning using multicriteria optimization for localized prostate cancer.

Détails

ID Serval
serval:BIB_82182BA7DB61
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Volumetric-modulated arc therapy planning using multicriteria optimization for localized prostate cancer.
Périodique
Journal of Applied Clinical Medical Physics
Auteur(s)
Ghandour S., Matzinger O., Pachoud M.
ISSN
1526-9914 (Electronic)
ISSN-L
1526-9914
Statut éditorial
Publié
Date de publication
2015
Peer-reviewed
Oui
Volume
16
Numéro
3
Pages
258-269
Langue
anglais
Résumé
The purpose of this work is to evaluate the volumetric-modulated arc therapy (VMAT) multicriteria optimization (MCO) algorithm clinically available in the RayStation treatment planning system (TPS) and its ability to reduce treatment planning time while providing high dosimetric plan quality. Nine patients with localized prostate cancer who were previously treated with 78 Gy in 39 fractions using VMAT plans and rayArc system based on the direct machine parameter optimization (DMPO) algorithm were selected and replanned using the VMAT-MCO system. First, the dosimetric quality of the plans was evaluated using multiple conformity metrics that account for target coverage and sparing of healthy tissue, used in our departmental clinical protocols. The conformity and homogeneity index, number of monitor units, and treatment planning time for both modalities were assessed. Next, the effects of the technical plan parameters, such as constraint leaf motion CLM (cm/°) and maximum arc delivery time T (s), on the accuracy of delivered dose were evaluated using quality assurance passing rates (QAs) measured using the Delta4 phantom from ScandiDos. For the dosimetric plan's quality analysis, the results show that the VMAT-MCO system provides plans comparable to the rayArc system with no statistical difference for V95% (p < 0.01), D1% (p < 0.01), CI (p < 0.01), and HI (p < 0.01) of the PTV, bladder (p < 0.01), and rectum (p < 0.01) constraints, except for the femoral heads and healthy tissues, for which a dose reduction was observed using MCO compared with rayArc (p < 0.01). The technical parameter study showed that a combination of CLM equal to 0.5 cm/degree and a maximum delivery time of 72 s allowed the accurate delivery of the VMAT-MCO plan on the Elekta Versa HD linear accelerator. Planning evaluation and dosimetric measurements showed that VMAT-MCO can be used clinically with the advantage of enhanced planning process efficiency by reducing the treatment planning time without impairing dosimetric quality.
Pubmed
Web of science
Création de la notice
03/07/2015 11:26
Dernière modification de la notice
03/03/2018 18:49
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