A methodology for choosing parameters for ESR readout of alanine dosimeters for radiotherapy

Garcia, Tristan; Lin, Min; Pasquié, I.; Lourenço, Valérie

doi:10.1016/j.radphyschem.2009.05.020

Cited by 22 publications

(20 citation statements)

References 29 publications

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“…EPR readout parameters are the ones described by Garcia 2009 except that five sweeps per angle are performed instead of 7. 17 The gain is set according to the signal. Correction factors due to pellet mass, gain, and irradiation temperature are applied.…”

Section: A2 Epr Readoutmentioning

confidence: 99%

“…Each dosimeter is irradiated in a water phantom, according to the TRS 398 reference conditions, for their signal to be easily related to an absorbed dose into water, with low uncertainties. Linear regression is calculated between EPR amplitudes with their associated uncertainties 17 and delivered dose with associated uncertainties (dosimeter positioning, irradiation time, etc.). LNHB alanine calibration curves had been validated as suitable for use of alanine in nonreference conditions.…”

Section: A3 Calibration Curve D = F (Epr Amplitude)mentioning

confidence: 99%

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Absolute calibration of the Gamma Knife^® Perfexion™ and delivered dose verification using EPR/alanine dosimetry

et al. 2014

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Section: A2 Epr Readoutmentioning

confidence: 99%

Section: A3 Calibration Curve D = F (Epr Amplitude)mentioning

confidence: 99%

Absolute calibration of the Gamma Knife^® Perfexion™ and delivered dose verification using EPR/alanine dosimetry

et al. 2014

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“…The following parameters were set for EPR spectra acquisition: microwave power 6.32 mW, modulation amplitude 1 mT, modulation frequency 50 kHz (fixed for this instrumentation), center field 347 mT, field sweep width 30 mT. The sweep time (42 s), the time constant (655 ms) for 1024 points and the receiver gain were set in order to avoid any signal distortion [37]. The first derivative of the EPR absorption spectrum was recorded at room temperature.…”

Section: Epr Measurementsmentioning

confidence: 99%

Dosimetry for electron Intra-Operative RadioTherapy: Comparison of output factors obtained through alanine/EPR pellets, ionization chamber and Monte Carlo-GEANT4 simulations for IORT mobile dedicate accelerator

Marrale

Longo

Russo

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…The EPR readout process consisted of measurements at different angles (0, 120 and 240°) in order to take into account a possible variation of the response with angle. The EPR readout parameters are the ones described by Garcia et al [6] except that 5 sweeps per angle were performed instead of 7. The gain was set according to the signal.…”

Section: Lne-lnhb Measurement Protocolmentioning

confidence: 99%

EURAMET.RI(I)-S7 comparison of alanine dosimetry systems for absorbed dose to water measurements in gamma- and x-radiation at radiotherapy levels

2012

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The National Physical Laboratory (NPL), the Physikalisch-Technische Bundesanstalt (PTB) and the Laboratoire National Henri Becquerel (LNE-LNHB) are involved in the European project "External Beam Cancer Therapy", a project of the European Metrology Research Programme. Within this project, the electron paramagnetic resonance (EPR)/alanine dosimetric method has been chosen for performing measurements in small fields such as those used in IMRT (Intensity Modulated Radiation Therapy). In this context, these three national metrology institutes (NMI) wished to compare the result of their alanine dosimetric systems (detector, modus operandi etc) at radiotherapy dose levels to check their consistency. This EURAMET.RI(I)-S7 comparison has been performed with the support of the Bureau International des Poids et Mesures (BIPM) which collected and distributed the results as a neutral organization, to ensure the comparison was "blind". Irradiations have been made under reference conditions by each laboratory in a 60 Co beam and in an accelerator beam (10 MV or 12 MV) in a water phantom of 30 cm × 30 cm × 30 cm in a square field of 10 cm × 10 cm at the reference depth. Irradiations have been performed at known values of absorbed dose to water (D w) within 10 % of nominal doses of 5 Gy and 10 Gy, i.e. between 4.5 Gy and5.5 Gy and between 9 Gy and 11 Gy, respectively. Each participant read out their dosimeters and assessed the doses using their own protocol (calibration curve, positioning device etc) as this comparison aims at comparing the complete dosimetric process. The results demonstrate the effectiveness of the EPR/alanine dosimetry systems operated by national metrology institutes as a method of assuring therapy level doses with the accuracy required. The maximum deviation in the ratio of measured to applied dose is less than 1 %.

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A methodology for choosing parameters for ESR readout of alanine dosimeters for radiotherapy

Cited by 22 publications

References 29 publications

Absolute calibration of the Gamma Knife^® Perfexion™ and delivered dose verification using EPR/alanine dosimetry

Absolute calibration of the Gamma Knife^® Perfexion™ and delivered dose verification using EPR/alanine dosimetry

Dosimetry for electron Intra-Operative RadioTherapy: Comparison of output factors obtained through alanine/EPR pellets, ionization chamber and Monte Carlo-GEANT4 simulations for IORT mobile dedicate accelerator

EURAMET.RI(I)-S7 comparison of alanine dosimetry systems for absorbed dose to water measurements in gamma- and x-radiation at radiotherapy levels

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A methodology for choosing parameters for ESR readout of alanine dosimeters for radiotherapy

Cited by 22 publications

References 29 publications

Absolute calibration of the Gamma Knife® Perfexion™ and delivered dose verification using EPR/alanine dosimetry

Absolute calibration of the Gamma Knife® Perfexion™ and delivered dose verification using EPR/alanine dosimetry

Dosimetry for electron Intra-Operative RadioTherapy: Comparison of output factors obtained through alanine/EPR pellets, ionization chamber and Monte Carlo-GEANT4 simulations for IORT mobile dedicate accelerator

EURAMET.RI(I)-S7 comparison of alanine dosimetry systems for absorbed dose to water measurements in gamma- and x-radiation at radiotherapy levels

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Absolute calibration of the Gamma Knife^® Perfexion™ and delivered dose verification using EPR/alanine dosimetry

Absolute calibration of the Gamma Knife^® Perfexion™ and delivered dose verification using EPR/alanine dosimetry