Dosimetric performance of continuous EPID imaging in stereotactic treatment conditions

Barbeiro, A.R.; Parent, L.; Vieillevigne, L.; Ferrand, R.; Franceries, X.

doi:10.1016/j.ejmp.2020.09.009

Cited by 4 publications

(5 citation statements)

References 26 publications

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“…Detector stability over time is crucial to meaningful absolute OTM system results. Studies have validated this for both Varian (Barbeiro et al 2020) and Elekta (Louwe et al 2004) EPIDs and for transmission detectors (Hoffman et al 2017). A simple reference field exposure (e.g.…”

Section: Detector Stabilitymentioning

confidence: 86%

“…Recommendation: Performed at detector commissioning and post-upgrade. A standard deviation of detector response <1% at isocentre/central axis as acceptable for dosimetric purposes (Barbeiro et al 2020).…”

Section: Reproducibilitymentioning

confidence: 99%

“…Ghosting can be detected by exposing the panel to an open field and then acquiring a dark current image or different open field size. Using a TruebeamSTx and aS1000 EPID, Barbeiro et al (2020) acquired two consecutive acquisitions with 30 s interval to represent a worst case clinical scenario. Differences were noted between acquisition mode with a maximum observed of response change of −1.44%.…”

Section: Ghosting (Epid)mentioning

confidence: 99%

See 2 more Smart Citations

IPEM topical report: guidance for the clinical implementation of online treatment monitoring solutions for IMRT/VMAT

Stevens

Moloney

Blackmore³

et al. 2023

Phys. Med. Biol.

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This report provides guidance for the implementation of online treatment monitoring (OTM) solutions in radiotherapy (RT), with a focus on modulated treatments. Support is provided covering the implementation process, from identification of an OTM solution to local implementation strategy. Guidance has been developed by a RT special interest group (RTSIG) working party (WP) on behalf of the Institute of Physics and Engineering in Medicine (IPEM). Recommendations within the report are derived from the experience of the WP members (in consultation with manufacturers, vendors and user groups), existing guidance or legislation and a UK survey conducted in 2020 (Stevens et al., 2021).OTM is an inclusive term representing any system capable of providing a direct or inferred measurement of the delivered dose to a RT patient. Information on each type of OTM is provided but, commensurate with UK demand, guidance is largely influenced by in vivo dosimetry (IVD) methods utilising the electronic portal imager device (EPID).Sections are included on the choice of OTM solutions, acceptance and commissioning methods with recommendations on routine quality control, analytical methods and tolerance setting, clinical introduction and staffing/resource requirements. The guidance aims to give a practical solution to sensitivity and specificity testing. Functionality is provided for the user to introduce known errors into treatment plans for local testing. Receiver operating characteristic (ROC) analysis is discussed as a tool to performance assess OTM systems. OTM solutions can help verify the correct delivery of radiotherapy treatment. Furthermore, modern systems are increasingly capable of providing clinical decision-making information which can impact the course of a patient’s treatment. However, technical limitations persist. It is not within the scope of this guidance to critique each available solution, but the user is encouraged to carefully consider workflow and engage with manufacturers in resolving compatibility issues. 

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Section: Detector Stabilitymentioning

confidence: 86%

Section: Reproducibilitymentioning

confidence: 99%

Section: Ghosting (Epid)mentioning

confidence: 99%

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IPEM topical report: guidance for the clinical implementation of online treatment monitoring solutions for IMRT/VMAT

Stevens

Moloney

Blackmore³

et al. 2023

Phys. Med. Biol.

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“…[30][31][32] Barbeiro et al have demonstrated with synthetic tests that a slight decrease in response linearity can be observed at the high exposures with FFF beams. 33 Xu et al found that the detector panel has a saturation in case of high dose-rate beams, but it was clinically insignificant even at the maximum dose rate of 2400 MU/min. 34 Pardo et al and Miri et al investigated FFF beam dosimetry plans and found no clinically relevant deviations, but in these studies plans were not included using beams over ca.…”

Section: Discussionmentioning

confidence: 99%

“…have demonstrated with synthetic tests that a slight decrease in response linearity can be observed at the high exposures with FFF beams. 33 Xu et al . found that the detector panel has a saturation in case of high dose-rate beams, but it was clinically insignificant even at the maximum dose rate of 2400 MU/min.…”

Section: Discussionmentioning

confidence: 99%

Verification of an optimizer algorithm by the beam delivery evaluation of intensity-modulated arc therapy plans

Pócza

Szegedi

Major

et al. 2021

Radiology and Oncology

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Background In the case of dynamic radiotherapy plans, the fractionation schemes can have dosimetric effects. Our goal was to define the effect of the fraction dose on the plan quality and the beam delivery. Materials and methods Treatment plans were created for 5 early-stage lung cancer patients with different dose schedules. The planned total dose was 60 Gy, fraction dose was 2 Gy, 3 Gy, 5 Gy, 12 Gy and 20 Gy. Additionally renormalized plans were created by changing the prescribed fraction dose after optimization. The dosimetric parameters and the beam delivery parameters were collected to define the plan quality and the complexity of the treatment plans. The accuracy of dose delivery was verified with dose measurements using electronic portal imaging device (EPID). Results The plan quality was independent from the used fractionation scheme. The fraction dose could be changed safely after the optimization, the delivery accuracy of the treatment plans with changed prescribed dose was not lower. According to EPID based measurements, the high fraction dose and dose rate caused the saturation of the detector, which lowered the gamma passing rate. The aperture complexity score, the gantry speed and the dose rate changes were not predicting factors for the gamma passing rate values. Conclusions The plan quality and the delivery accuracy are independent from the fraction dose, moreover the fraction dose can be changed safely after the dose optimization. The saturation effect of the EPID has to be considered when the action limits of the quality assurance system are defined.

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Technical note: GAMMORA, a free, open-source, and validated GATE-based model for Monte-Carlo simulations of the Varian TrueBeam

et al. 2021

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Dosimetric performance of continuous EPID imaging in stereotactic treatment conditions

Cited by 4 publications

References 26 publications

IPEM topical report: guidance for the clinical implementation of online treatment monitoring solutions for IMRT/VMAT

IPEM topical report: guidance for the clinical implementation of online treatment monitoring solutions for IMRT/VMAT

Verification of an optimizer algorithm by the beam delivery evaluation of intensity-modulated arc therapy plans

Technical note: GAMMORA, a free, open-source, and validated GATE-based model for Monte-Carlo simulations of the Varian TrueBeam

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