Assessment of portal dosimetry accuracy as a QA tool for VMAT clinical treatment plans using dolphin/compass tools

Monseux, A.; Baltieri, V.; Sottiaux, A.; Tomsej, M.; Leclercq, Caroline

doi:10.1016/j.ejmp.2016.07.575

Cited by 3 publications

(2 citation statements)

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“…Dolphin allows online dosimetry because of the transmission-type detector [ 11 ]. Moreover, a 3D dose verification can be performed using Dolphin with COMPASS software [ 21 , 22 ]. However, Eclipse does not support plan optimization and dose calculation for Dolphin.…”

Section: Discussionmentioning

confidence: 99%

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Validation of new transmission detector transmission factors for online dosimetry: an experimental study

Park

Kim

et al. 2018

Radiat Oncol

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BackgroundThe demand for dose verification during treatment has risen with the increasing use of intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) in modern radiation therapy. This study aims to validate the transmission factors of a new transmission detector, the Dolphin online monitoring system (IBA Dosimetry, Schwarzenbruck, Germany), for clinical use.MethodsThe transmission factors of the Dolphin detector were evaluated using 6 MV, 6 flattening filter free (FFF), 10 MV, and 10 FFF clinical beams from a TrueBeam STx linear accelerator system. Two-dimensional (2D) dose distributions were measured through portal dosimetry with and without Dolphin to derive the transmission factors. The measurements were performed using 10 IMRT and 10 VMAT treatment plans. The transmission factors were calculated using a non-negative least squares problem solver for the 2D dose matrix. Normalized plans were generated using the derived transmission factors. Patient-specific quality assurance with normalized plans was performed using portal dosimetry and an ArcCheck detector to verify the transmission factors. The gamma passing rates were calculated for the 2%/2 mm and 1%/1 mm criteria.ResultsThe transmission factors for the 6 MV, 6 FFF, 10 MV, and 10 FFF beams, were 0.878, 0.824, 0.913, and 0.883, respectively. The average dose difference between the original plan without Dolphin and the normalized plan with Dolphin was less than 1.8% for all measurements. The mean passing rates of the gamma evaluation were 98.1 ± 2.1 and 82.9 ± 12.6 for the 2%/2 mm and 1%/1 mm criteria, respectively, for portal dosimetry of the original plan. In the case of the portal dosimetry of the normalized plan, the mean passing rates of the gamma evaluation were 97.2 ± 2.8 and 79.1 ± 14.8 for the 2%/2 mm and 1%/1 mm criteria, respectively.ConclusionsThe Dolphin detector can be used for online dosimetry when valid transmission factors are applied to the clinical plan.

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Section: Discussionmentioning

confidence: 99%

“…Dolphin is a monitoring system with transmission detectors. The measurement data can be reconstructed to a 3D dose distribution on a 3D-CT image set using COMPASS software (IBA Dosimetry, Schwarzenbruck, Germany) [ 21 , 22 ]. Dolphin can be used for pretreatment QA as well as during each fraction.…”

Section: Introductionmentioning

confidence: 99%

Validation of new transmission detector transmission factors for online dosimetry: an experimental study

Park

Kim

et al. 2018

Radiat Oncol

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show abstract

Letter to the editor of radiotherapy and oncology regarding the article esposito et al: Estimating dose delivery accuracy in stereotactic body radiation therapy: A review of in-vivo measurement methods

Kos¹

2020

Radiotherapy and Oncology

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Generation, validation, and benchmarking of a commercial independent Monte Carlo calculation beam model for multi-target SRS

Adamson,

Erickson,

Wang

et al. 2023

Zeitschrift für Medizinische Physik

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Assessment of portal dosimetry accuracy as a QA tool for VMAT clinical treatment plans using dolphin/compass tools

Cited by 3 publications

References 0 publications

Validation of new transmission detector transmission factors for online dosimetry: an experimental study

Validation of new transmission detector transmission factors for online dosimetry: an experimental study

Letter to the editor of radiotherapy and oncology regarding the article esposito et al: Estimating dose delivery accuracy in stereotactic body radiation therapy: A review of in-vivo measurement methods

Generation, validation, and benchmarking of a commercial independent Monte Carlo calculation beam model for multi-target SRS

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