AUTHOR=Russo Stefania , Ricotti Rosalinda , Molinelli Silvia , Patti Filippo , Barcellini Amelia , Mastella Edoardo , Pella Andrea , Paganelli Chiara , Marvaso Giulia , Pepa Matteo , Comi Stefania , Zaffaroni Mattia , Avuzzi Barbara , Giandini Tommaso , Pignoli Emanuele , Valdagni Riccardo , Baroni Guido , Cattani Federica , Ciocca Mario , Jereczek-Fossa Barbara Alicja , Orlandi Ester , Orecchia Roberto , Vischioni Barbara TITLE=Dosimetric Impact of Inter-Fraction Anatomical Changes in Carbon Ion Boost Treatment for High-Risk Prostate Cancer (AIRC IG 14300) JOURNAL=Frontiers in Oncology VOLUME=11 YEAR=2021 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2021.740661 DOI=10.3389/fonc.2021.740661 ISSN=2234-943X ABSTRACT=

Rectum and bladder volumes play an important role in the dose distribution reproducibility in prostate cancer adenocarcinoma (PCa) radiotherapy, especially for particle therapy, where density variation can strongly affect the dose distribution. We investigated the reliability and reproducibility of our image-guided radiotherapy (IGRT) and treatment planning protocol for carbon ion radiotherapy (CIRT) within the phase II mixed beam study (AIRC IG 14300) for the treatment of high-risk PCa. In order to calculate the daily dose distribution, a set of synthetic computed tomography (sCT) images was generated from the cone beam computed tomography (CBCT) images acquired in each treatment session. Planning target volume (PTV) together with rectum and bladder volume variation was evaluated with sCT dose-volume histogram (DVH) metric deviations from the planning values. The correlations between the bladder and rectum volumes, and the corresponding DVH metrics, were also assessed. No significant difference in the bladder, rectum, and PTV median volumes between the planning computed tomography (pCT) and the sCT was found. In addition, no significant difference was assessed when comparing the average DVHs and median DVH metrics between pCT and sCT. Dose deviations determined by bladder and rectum filling variations demonstrated that dose distributions were reproducible in terms of both target coverage and organs at risk (OARs) sparing.