Physical and Dosimetric Aspect of Euromechanics Add-on Multileaf Collimator on Varian Clinac 2100 C/D

Rohani, S A; Mahdavi, Seyed Rabi; Mostaar, Ahmad; Ueltzhöffer, Stefan; Mohammadi, Reza; Geraily, Gh

doi:10.31661/jbpe.v0i0.1045

Cited by 2 publications

(10 citation statements)

References 24 publications

(29 reference statements)

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“…Leaf positioning accuracy affects treatment plan delivery, and inaccurate leaf positioning can cause large dose deviations [19]. We found the leaf positioning accuracy and reproducibility of the αMLC to be <1 mm.…”

Section: Discussionmentioning

confidence: 75%

“…The dual-layer leaf transmission of the αMLC is signi cantly reduced compared to its single-layer. The Elekta Agility MLC [6], the Varian Millennium TM 120-leaf MLC [14,15], the Cobalt-60-based ViewRay MRIdian MLC [7], and Euromechanics PMLC [19] have a measured average leaf transmission of 0.35%, 1.36%, 0.153%, and 1.79%, respectively. The maximum leaf transmission of the above MLC systems is 0.44%, 1.8%, 0.35 %, and 4.1%, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…As expected, the irradiation eld's stepped boundary makes it di cult to form a smooth target boundary [17,18]. Generally, a good MLC should have high leaf positioning accuracy, low leaf transmission, small penumbra, and accurate creation of various clinically required complex elds [6, 10,19,20].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a novel VenusX orthogonal dual-layer multileaf collimator

Wang

Yang

et al. 2023

Preprint

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Background We investigated and characterized the performance of a novel orthogonal dual-layer multileaf collimator (αMLC) mounted on the LinaTech VenusX medical linear accelerator. Methods We evaluated leaf positioning accuracy and reproducibility using electronic portal imaging device (EPID) images of the picket fence test. The average, interleaf, and leaf-end transmissions of the upper, lower, and both αMLC layers were measured using an ionization chamber or EPID. The square and rhombus fields were used to evaluate the leaf penumbra of αMLC. To investigate the advantages of an orthogonal dual-layer MLC in field shaping, a right triangular pattern field, and a circular pattern field were formed using both layers and a single layer of the αMLC. These two evaluation pattern fields imaged were acquired by EPID and compared. Results The deviations in the positioning accuracy of the upper and lower MLC were 0.76 mm and 0.62 mm, respectively. Reproducibility was 0.29 mm and 0.26 mm correspondingly. The measured average transmissions were 1.86%, 1.82% and 0.03% for upper-, lower- and dual-layer MLC, respectively. The maximum interleaf transmission of the lower-layer MLC was 2.22% and 0.21% for the dual-layer. The maximum leaf-end transmissions were 23.90% and 0.44% correspondingly. Penumbra of the square field is 6.2 mm in X direction and 8.0 mm in Y direction. Average penumbras of the rhombus fields with side lengths of 5 cm and 10 cm were 3.6 mm and 4.9 mm, respectively. For the right triangular and circular fields, the fields shaped by the dual-layer of the αMLC were much closer to the planned field than the single-layer MLC. The dose undulation amplitude of the 50% isodose lines and the leaf stepping angle change of both layers was smaller than the single-layer MLC. Conclusions The αMLC benefits from its orthogonal dual-layer design. Leaf transmission, dose undulations at the field edge, and MLC field dependence of the leaf stepping angle of the dual-layer αMLC were remarkably reduced. αMLC can potentially improve the quality of IMRT and VMAT plans.

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Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

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Characterization of a novel VenusX orthogonal dual-layer multileaf collimator

Wang

Yang

et al. 2023

Preprint

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“…18,19 Generally, a good MLC should possess high leaf positioning accuracy, low leaf transmission, small penumbra, and the ability to accurately create various clinically required complex fields. 6,10,17,20 VenusX is a medical linear accelerator (linac) developed by LinaTech (LinaTech LLC, Sunnyvale, CA), a medical company. Recently, VenusX has been approved by the China Food and Drug Administration and is being used in clinics.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, the application of single‐layer MLC in radiotherapy has many limitations. Radiation leakage increases the dose both inside and outside the target volume, which is undesirable 17 . Additionally, the projection width of the traditional single‐layer MLC on the isocenter plane typically ranges from 0.25 to 1.0 cm.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a novel VenusX orthogonal dual‐layer multileaf collimator

Wang,

Li,

Wang

et al. 2024

J Applied Clin Med Phys

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PurposeTo investigate and characterize the performance of a novel orthogonal dual‐layer alpha multileaf collimator (αMLC) mounted on the LinaTech VenusX linac.MethodsWe evaluated leaf positioning accuracy and reproducibility using an electronic portal imaging device through the picket fence test. The average, interleaf, intraleaf, and leaf tip transmissions of the single and dual layers were measured using an ionization chamber. Square and rhombus fields were used to evaluate the leaf penumbra of αMLC. To investigate the advantages of the orthogonal dual‐layer multileaf collimator (MLC) in field shaping, right triangular and circular pattern fields were formed using both the dual layers and single layers of the αMLC.ResultsThe average maximum positioning deviations of the upper and lower αMLC over 1 year were 0.76 ± 0.09 mm and 0.62 ± 0.07 mm, respectively. The average transmissions were 1.87%, 1.83%, and 0.03% for the upper‐, lower‐ and dual‐layer αMLC, respectively. The maximum interleaf transmissions of the lower‐ and dual‐layer were 2.43% and 0.17%, respectively. The leaf tip transmissions were 9.34% and 0.25%, respectively. The penumbra of the square field was 6.2 mm in the X direction and 8.0 mm in the Y direction. The average penumbras of the rhombus fields with side lengths of 5 and 10 cm were 3.6 and 4.9 mm, respectively. For the right triangular and circular fields, the fields shaped by the dual‐layer leaves were much closer to the set field than those shaped by single‐layer leaves. The dose undulation amplitude of the 50% isodose lines and leaf stepping angle change of the dual‐layer leaves were smaller than those of the single‐layer leaves.ConclusionsThe αMLC benefits from its orthogonal dual‐layer design. Leaf transmission, dose undulations at the field edge, and MLC field dependence of the leaf stepping angle of the dual‐layer αMLC were remarkably reduced.

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Physical and Dosimetric Aspect of Euromechanics Add-on Multileaf Collimator on Varian Clinac 2100 C/D

Cited by 2 publications

References 24 publications

Characterization of a novel VenusX orthogonal dual-layer multileaf collimator

Characterization of a novel VenusX orthogonal dual-layer multileaf collimator

Characterization of a novel VenusX orthogonal dual‐layer multileaf collimator

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