Publications by authors named "Petter Hofverberg"
Radioluminescent silica-based fiber dosimeters offer great advantages for designing miniaturized realtime sensors for high dose-rate dosimetry. Rise and fall kinetics of their response must be properly understood to better assess their performances in terms of measurement speed and repeatability. A standard model of radioluminescence (RL) has already been quantitatively validated for doped silica glasses, but beyond conclusive comparisons with specific experiments, a comprehensive understanding of the processes and parameters determining transient and equilibrium kinetics of RL is still lacking.
View Article and Find Full Text PDFArticle Synopsis
- Accurate determination and verification of monitor units are vital for effective dose distribution in radiotherapy, particularly in ocular proton therapy for eye melanoma.
- A multi-institutional study involving three European institutes aimed to create a generalized model for predicting monitor units using data from 3,748 patients and various machine learning algorithms.
- The model showed promising results, achieving predictions within 3% uncertainty for 85.2% of plans and within 10% for 98.6% of plans, signifying a potential advancement in treatment planning systems.
Purpose: Eye-dedicated proton therapy (PT) facilities are used to treat malignant intraocular lesions, especially uveal melanoma (UM). The first commercial ocular PT beamline from Varian was installed in the Netherlands. In this work, the conceptual design of the new eyeline is presented.
View Article and Find Full Text PDFAmbient dose equivalent measurements with radiation protection instruments are associated to large uncertainties, mostly due to the energy dependence of the instrument response and to the dissimilarity between the spectra of the standard calibration source and the workplace field. The purpose of this work is to evaluate its impact on the performance of area and environmental detectors in the proton therapy environment, and to provide practical solutions whenever needed and possible. The study was carried out at the Centre Antoine Lacassagne (CAL) proton therapy site, and included a number of commercially available area detectors and a home-made environmental thermoluminescent dosimeter based on a polyethylene moderator loaded with TLD600H/TLD700H pairs.
View Article and Find Full Text PDFPurpose: Phosphenes are frequently reported by patients irradiated in the head and neck area. The aim of the present study was to characterize and investigate potential mechanisms of proton beam therapy (PBT)-induced phosphenes in a large population of patients undergoing PBT for ocular tumors.
Design: Prospective cohort study.