Feasibility of using a dose-area product ratio as beam quality specifier for photon beams with small field sizes

Autor: Maria Pimpinella, A. Ostrowsky, F. Delaunay, J. Daures, Maïwenn Le Roy, J. Gouriou, L. Silvi, S. Dufreneix, Didier Vermesse, Claudio Caporali, Assunta Petrucci, Vanessa De Coste, Line Sommier, A.S. Guerra, Jean-Marc Bordy, B. Rapp
Přispěvatelé: Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti (ENEA-INMRI), Azienda Ospedaliera San Filippo Neri, Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, European Project: EMRP-HLT09,MetrExtRT, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), De Coste, V., Silvi, L., Guerra, A. S., Caporali, C., Pimpinella, M.
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Monte Carlo method
General Physics and Astronomy
DIODE
7. Clean energy
030218 nuclear medicine & medical imaging
0302 clinical medicine
MONTE-CARLO
ionization chamber
Ionization
Cobalt Radioisotopes
[STAT.AP]Statistics [stat]/Applications [stat.AP]
DAP ratio
Dose-area product
Beam quality
Small photon beams
Air
Uncertainty
Radiotherapy Dosage
General Medicine
DOSIMETRY
simulation
030220 oncology & carcinogenesis
Absorbed dose
DIAMOND DETECTORS
Laser beam quality
ionizing radiation
Monte Carlo Method
SYNTHETIC MICRODIAMOND DETECTORS
RADIOSURGERY
Materials science
Field (physics)
Biophysics
DIAMOND
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
03 medical and health sciences
SCINTILLATOR
Optics
MONTE CARLO
Dosimetry
Radiology
Nuclear Medicine and imaging
Computer Simulation
IMRT
Radiometry
DETECTOR
radiotherapy
Photons
business.industry
Water
[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation
Dose area product
MV
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic
Particle Accelerators
business
Beam (structure)
SYSTEM
Zdroj: Physica Medica
Physica Medica, Elsevier, 2018, 45, pp.106-116. ⟨10.1016/j.ejmp.2017.12.012⟩
Physica Medica, 2018, 45, pp.106-116. ⟨10.1016/j.ejmp.2017.12.012⟩
ISSN: 1120-1797
DOI: 10.1016/j.ejmp.2017.12.012⟩
Popis: Purpose: To investigate the feasibility of using the ratio of dose-area product at 20 cm and 10 cm water depths (DAPR20,10) as a beam quality specifier for radiotherapy photon beams with field diameter below 2 cm. Methods: Dose-area product was determined as the integral of absorbed dose to water (Dw) over a surface larger than the beam size. 6 MV and 10 MV photon beams with field diameters from 0.75 cm to 2 cm were considered. Monte Carlo (MC) simulations were performed to calculate energy-dependent dosimetric parameters and to study the DAPR20,10 properties. Aspects relevant to DAPR20,10 measurement were explored using large-area plane-parallel ionization chambers with different diameters. Results: DAPR20,10 was nearly independent of field size in line with the small differences among the corresponding mean beam energies. Both MC and experimental results showed a dependence of DAPR20,10 on the measurement setup and the surface over which Dw is integrated. For a given setup, DAPR20,10 values obtained using ionization chambers with different air-cavity diameters agreed with one another within 0.4%, after the application of MC correction factors accounting for effects due to the chamber size. DAPR20,10 differences among the small field sizes were within 1% and sensitivity to the beam energy resulted similar to that of established beam quality specifiers based on the point measurement of Dw. Conclusions: For a specific measurement setup and integration area, DAPR20,10 proved suitable to specify the beam quality of small photon beams for the selection of energy-dependent dosimetric parameters. © 2017 Associazione Italiana di Fisica Medica
Databáze: OpenAIRE
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