Erratum: The magnetic field dependent displacement effect and its correction in reference and relative dosimetry (2022 Phys. Med. Biol.
                  67 045004)

Tekin, Tuba; Blum, Isabel; Delfs, Björn; Schönfeld, Ann-Britt; Poppe, Björn; Looe, Hui Khee

doi:10.1088/1361-6560/ac612e

Cited by 1 publication

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“…This setup ensures that different parts of the Farmer chamber are at slightly different off-axis positions, thus improving the robustness of measurements and to minimize any uncertainties associated with the discrete sampling of segments. Farmer chamber response is sensitive to the orientation with respect to the B-field (Spindeldreier et al 2017, Tekin et al 2022. However, this effect is assumed to change all measurements in the same way, such that the aSG-analysis, which uses only relative values, is unaffected.…”

Section: Experimental Setup For the Asg Tests For Versahd And Unitymentioning

confidence: 99%

Multileaf collimator characterization and modeling for a 1.5 T MR-linac using static synchronous and asynchronous sweeping gaps

Kierkels,

Hernandez,

Saez

et al. 2024

Phys. Med. Biol.

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Objective: The Elekta Unity MR-linac delivers step-and-shoot intensity modulated radiotherapy plans using a multileaf collimator (MLC) based on the Agility MLC used on conventional Elekta linacs. Currently, details of the physical Unity MLC and the computational model within its treatment planning system (TPS) Monaco are lacking in published literature. Recently, a novel approach to characterize the physical properties of MLCs was introduced using dynamic synchronous and asynchronous sweeping gap (aSG) tests. Our objective was to develop a step-and-shoot version of the dynamic aSG test to characterize the Unity MLC and the computational MLC models in the Monaco and RayStation TPSs.Approach: Dynamic aSG were discretized into a step-and-shoot aSG by investigating the number of segments/sweep and the minimal number of monitor units (MU) per segment. The step-and-shoot aSG tests were compared to the dynamic aSG tests on a conventional linac at a source-to-detector distance of 143.5 cm, mimicking the Unity configuration. the step-and-shoot aSG tests were used to characterize the Unity MLC through measurements and dose calculations in both TPSs.Main results: The step-and-shoot aSGs tests with 100 segments and 5 MU/segment gave results very similar to the dynamic aSG experiments. The effective tongue-and-groove width of the Unity gradually increased up to 1.4 cm from the leaf tip end. The MLC models in RayStation and Monaco agreed with experimental data within 2.0% and 10%, respectively. The largest discrepancies in Monaco were found for aSG tests with > 10 mm leaf interdigitation, which are non-typical for clinical plans. Significance: The step-and-shoot aSG tests accurately characterize the MLC in step-and-shoot delivery mode. The MLC model in RayStation 2023B accurately describes the tongue-and-groove and leaf tip effects whereas Monaco overestimates the tongue-and-groove shadowing further away from the leaf tip end.

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Section: Experimental Setup For the Asg Tests For Versahd And Unitymentioning

confidence: 99%

Multileaf collimator characterization and modeling for a 1.5 T MR-linac using static synchronous and asynchronous sweeping gaps

Kierkels,

Hernandez,

Saez

et al. 2024

Phys. Med. Biol.

View full text Add to dashboard Cite

show abstract

Erratum: The magnetic field dependent displacement effect and its correction in reference and relative dosimetry (2022 Phys. Med. Biol. 67 045004)

Cited by 1 publication

References 0 publications

Multileaf collimator characterization and modeling for a 1.5 T MR-linac using static synchronous and asynchronous sweeping gaps

Multileaf collimator characterization and modeling for a 1.5 T MR-linac using static synchronous and asynchronous sweeping gaps

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