Implementation and validation of a beam‐current transformer on a medical pulsed electron beam LINAC for FLASH‐RT beam monitoring
| Autor: | Raphaël Moeckli, Jean Bourhis, Veljko Grilj, Marie-Catherine Vozenin, Patrik Gonçalves Jorge, Jean-François Germond, Claude Bailat, François Bochud, Roxane Oesterle |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
ultra‐high dose rate Electrons Linear particle accelerator Flash (photography) Optics Clinical Protocols Radiation Monitoring Humans Radiology Nuclear Medicine and imaging Radiometry Instrumentation FLASH RT Radiation business.industry Passive monitoring Radiotherapy Dosage Radiation Measurements Current transformer Absorbed dose Cathode ray beam current monitoring Particle Accelerators business Pulse-width modulation Beam (structure) |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| Popis: | Purpose To implement and validate a beam current transformer as a passive monitoring device on a pulsed electron beam medical linear accelerator (LINAC) for ultra‐high dose rate (UHDR) irradiations in the operational range of at least 3 Gy to improve dosimetric procedures currently in use for FLASH radiotherapy (FLASH‐RT) studies. Methods Two beam current transformers (BCTs) were placed at the exit of a medical LINAC capable of UHDR irradiations. The BCTs were validated as monitoring devices by verifying beam parameters consistency between nominal values and measured values, determining the relationship between the charge measured and the absorbed dose, and checking the short‐ and long‐term stability of the charge‐absorbed dose ratio. Results The beam parameters measured by the BCTs coincide with the nominal values. The charge‐dose relationship was found to be linear and independent of pulse width and frequency. Short‐ and long‐term stabilities were measured to be within acceptable limits. Conclusions The BCTs were implemented and validated on a pulsed electron beam medical LINAC, thus improving current dosimetric procedures and allowing for a more complete analysis of beam characteristics. BCTs were shown to be a valid method for beam monitoring for UHDR (and therefore FLASH) experiments. |
| Databáze: | OpenAIRE |
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