Improving bleeding detector features for electron intraoperative radiotherapy
| Autor: | S. Casans, Enrique Sanchis, R. Garcia-Gil, Enrique Sanchis-Sánchez, Julio Martos, M.J. Pérez-Calatayud, Ignacio Pérez-Calatayud, Jose Perez-Calatayud |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Radiotherapy business.industry Orientation (computer vision) Capacitive sensing Detector Biophysics General Physics and Astronomy Electrons Hemorrhage General Medicine Electron Linear particle accelerator 030218 nuclear medicine & medical imaging Intraoperative Period 03 medical and health sciences 0302 clinical medicine Optics 030220 oncology & carcinogenesis Radiology Nuclear Medicine and imaging Particle Accelerators business Intraoperative radiotherapy Quality assurance Signal conditioning |
| Zdroj: | Physica Medica. 65:150-156 |
| ISSN: | 1120-1797 |
| DOI: | 10.1016/j.ejmp.2019.08.015 |
| Popis: | Purpose The aim of this work is to improve the potential bleeding detection during intraoperative radiotherapy with linac polymethyl methacrylate applicators (PMMA), based on one previously developed. The improvements carried out have been focused on: i) minimizing the impact of the detector on the visual through the plastic applicators and ii) avoiding the asymmetry in the detection capability when the applicator is tilted. Methods Simulations have been made to select the geometry that provides a reduced visual impact on the applicator as well as allowing an independent response with the tilting angle of the applicator. A low-noise circuit for signal conditioning has been developed. Measurements have been made on three setups: 10 cm, 7 cm and 4 cm applicator diameters, 0° and 45° tilted. Results The detector has a visibility through the applicator greater than 50%. Due to the geometry, optimal detection is ensured regardless of its orientation when the applicator is tilted. It is possible to detect the presence of fluid well below the typical perturbing fluid depth established by the clinic (1–1.5 cm). Conclusions The detector can distinguish the presence of around 0.5 cm of fluid depth while showing a high visual field through the PMMA applicators and providing a measure that does not depend on the detector orientation when the applicator is tilted. The prototype is ready for its industrialization by embedding it into the applicator for clinical use. The detector would have a significant impact on both the quality assurance and the outcome of the treatment. |
| Databáze: | OpenAIRE |
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