Publicaties

Background Plane-parallel ionization chambers are the recommended secondary standard systems for clinical reference dosimetry of electrons. Dosimetry in high dose rate and dose-per-pulse (DPP) is challenging as ionization chambers are subject to ion recombination, especially when dose rate and/or DPP is increased beyond the range of conventional radiotherapy. The lack of universally accepted models for correction of ion recombination in UDHR is ...

Background and purpose: A dosimetry audit program based on alanine electron paramagnetic resonance (EPR) and radiochromic film dosimetry, may be a valuable tool for monitoring and improving the quality of lung stereotactic body radiotherapy (SBRT). The aim of this study was to report the initial, independent assessment of the dosimetric accuracy for lung SBRT practice using these dosimeters in combination with a novel phantom design. Materials ...

PURPOSE: This study aimed to develop and validate a Monte Carlo (MC) model for the Papillon + contact x-ray brachytherapy (CXB) device, producing 50 kilovolt (kV) X-rays, specifically focusing on its application with a 25 mm diameter rectal applicator for contact therapy. MATERIAL AND METHODS: The validation process involved depth dose and transverse dose profile measurements using EBT3 gafchromic films positioned in a plastic water low energy ...

For Eclipse users only TGI correlated with the dosimetry audit data, where a higher TGI gave poorer QA results (see Figure 2). The Pearson correlation coefficients of alanine and film dose vs TGI were r = 0.491 and 0.564 respectively. Conclusion In general, the complexity of benchmark and audit plans was found to be comparable, with no statistically significant difference in complexity observed for 4 of the 5 CMs evaluated. MDLG was ...

Radiation therapy (RT) is an essential treatment modality for cancer care and cure. Over the years, radiation treatments have become more complex and more computerized leading to highly precise treatment approaches maximising loco-regional control while minimizing toxicity. Safe and effective radiotherapy delivery however requires the implementation of adapted quality assurance (QA) programs and integral quality management (QM) systems, ...

For Eclipse users only TGI correlated with the dosimetry audit data, where a higher TGI gave poorer QA results (see Figure 2). The Pearson correlation coefficients of alanine and film dose vs TGI were r = 0.491 and 0.564 respectively. Conclusion In general, the complexity of benchmark and audit plans was found to be comparable, with no statistically significant difference in complexity observed for 4 of the 5 CMs evaluated. MDLG was ...

Purpose: Contemporary external radiotherapy requires the outmost precision in patient positioning. This can be achieved through 2D/3D image acquisition by the on-board imager (OBI) integrated into the linear accelerator. In this study, OBI 2D image acquisition protocols were assessed and optimized with regard to dose in an effort to reduce overall patient dose without degrading kV image quality. Materials and Methods: A phantom for high/low ...

The Nuclear Technology Centre (NuTeC) has been performing external dosimetry audits since 2009 for Belgian radiotherapy departments. The Belgian Federal Agency for Nuclear Control (FANC) requested a national audit programme for reference and non-reference conditions that led to the creation of the BELdART project. All Belgian centres could participate in the trial free of charge. This was the first large-scale dosimetry audit programme using ...

L-α-alanine Electron Paramagnetic Resonance (EPR) dosimetry is a convenient method for quality assurance (QA) measurements in radiotherapy due to its excellent properties (robustness, nearly water equivalent, nondestructive read-out, low signal fading rate). It has been used for more than 20 years as a transfer dosimetry system mostly for high-energy photon beams where the energy response is very well documented. The rapid development of small ...