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A simple calibration routine for small inorganic scintillation detectors for in vivo dosimetry during brachytherapy.
Brachytherapy
August 2024
Department of Clinical Medicine, Aarhus University, Aarhus, Denmark; Department of Oncology, Aarhus University Hospital, Aarhus, Denmark.
Background: In vivo dosimetry (IVD) is rarely performed in brachytherapy (BT), allowing potential dose misadministration to go unnoticed. This study presents a clinical routine-calibration method of detectors for IVD in high (HDR) and pulsed dose rate (PDR) Ir-192 BT.
Purpose: To evaluate the dosimetric precision and feasibility of an in-clinic calibration routine of detectors for IVD in afterloading BT.
Multibody dynamic modeling of the behavior of flexible instruments used in cervical cancer brachytherapy.
Med Phys
May 2024
Department of BioMechanical Engineering, Delft University of Technology, Delft, the Netherlands.
Article Synopsis
- The study focuses on creating computer models to simulate the behavior of brachytherapy (BT) instruments, specifically their source positions and needle insertion forces in curved applicators for cervical cancer treatment.
- The methodology involves using finite element analysis to compare simulated source paths with manufacturer measurements, showing small discrepancies that are acceptable for dosimetry.
- The results indicate that the models are accurate, which can help in designing better applicators that enhance the effectiveness of BT treatments.
AAPM WGDCAB Report 372: A joint AAPM, ESTRO, ABG, and ABS report on commissioning of model-based dose calculation algorithms in brachytherapy.
Med Phys
August 2023
Departamento de Física Atómica, Molecular y Nuclear, IRIMED, IIS-La Fe-Universitat de Valencia, Burjassot, Spain.
The introduction of model-based dose calculation algorithms (MBDCAs) in brachytherapy provides an opportunity for a more accurate dose calculation and opens the possibility for novel, innovative treatment modalities. The joint AAPM, ESTRO, and ABG Task Group 186 (TG-186) report provided guidance to early adopters. However, the commissioning aspect of these algorithms was described only in general terms with no quantitative goals.
View Article and Find Full Text PDFUse of Thermoluminescence Dosimetry for QA in High-Dose-Rate Skin Surface Brachytherapy with Custom-Flap Applicator.
Sensors (Basel)
March 2023
Radiotherapy Unit, Istituto Nazionale Tumori, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Fondazione G. Pascale, 80131 Naples, Italy.
Surface brachytherapy (BT) lacks standard quality assurance (QA) protocols. Commercially available treatment planning systems (TPSs) are based on a dose calculation formalism that assumes the patient is made of water, resulting in potential deviations between planned and delivered doses. Here, a method for treatment plan verification for skin surface BT is reported.
View Article and Find Full Text PDFArticle Synopsis
- The study addresses the challenge of accurately measuring doses in brachytherapy, particularly in areas with high dose gradients and proximity to organs at risk, by introducing a new calibration method for GafChromic EBT3 films irradiated by an Ir-192 source.
- Two exposure setups (single and dual catheter-based) were compared, and EBT3 films were analyzed using a flatbed scanner and Image J software, resulting in dose calibration graphs based on third-order polynomial equations.
- The research found varying levels of agreement between the TPS calculated doses and the measured doses from both calibration methods, with maximum dose differences observed in the high dose range, highlighting the potential for improved accuracy in dose reporting through the dual catheter setup.
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