Dynamic and omni wedge implementation on an Elekta SL linac

Phillips, Mark H.; Parsaei, Homayoon; Cho, Paul S.

doi:10.1118/1.599029

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…Elekta Versa HD is equipped with a 60° universal wedge mounted in the gantry head that moves in to yield an effective wedge angle when combined with an open photon field (16) . The largest field size for a wedged field is

30 \times 40 {cm}^{2}

.…”

Section: Methodsmentioning

confidence: 99%

Commissioning an Elekta Versa HD linear accelerator

Narayanasamy

Saenz

Cruz

et al. 2016

J Applied Clin Med Phys

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The purpose of this study is to report the dosimetric aspects of commissioning performed on an Elekta Versa HD linear accelerator (linac) with high‐dose‐rate flattening filter‐free (FFF) photon modes and electron modes. Acceptance and commissioning was performed on the Elekta Versa HD linac with five photon energies (6 MV, 10 MV, 18 MV, 6 MV FFF, 10 MV FFF), four electron energies (6 MeV, 9 MeV, 12 MeV, 15 MeV) and 160‐leaf (5 mm wide) multileaf collimators (MLCs). Mechanical and dosimetric data were measured and evaluated. The measurements include percent depth doses (PDDs), in‐plane and cross‐plane profiles, head scatter factor (Sc), relative photon output factors (Scp), universal wedge transmission factor, MLC transmission factors, and electron cone factors. Gantry, collimator, and couch isocentricity measurements were within 1 mm, 0.7 mm, and 0.7 mm diameter, respectively. The PDDs of 6 MV FFF and 10 MV FFF beams show deeper dmax and steeper falloff with depth than the corresponding flattened beams. While flatness values of 6 MV FFF and 10 MV FFF normalized profiles were expectedly higher than the corresponding flattened beams, the symmetry values were almost identical. The cross‐plane penumbra values were higher than the in‐plane penumbra values for all the energies. The MLC transmission values were 0.5%, 0.6%, and 0.6% for 6 MV, 10 MV, and 18 MV photon beams, respectively. The electron PDDs, profiles, and cone factors agree well with the literature. The outcome of radiation treatment is directly related to the accuracy in the dose modeled in the treatment planning system, which is based on the commissioned data. Commissioning data provided us a valuable insight into the dosimetric characteristics of the beam. This set of commissioning data can provide comparison data to others performing Versa HD commissioning, thereby improving patient safety.PACS number(s): 87.56.bd

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30 \times 40 {cm}^{2}

.…”

Section: Methodsmentioning

confidence: 99%

Commissioning an Elekta Versa HD linear accelerator

Narayanasamy

Saenz

Cruz

et al. 2016

J Applied Clin Med Phys

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“…OmniWedge™ is an extension of the common virtual (dynamic) wedge concept. In a single beam, it combines an open field segment, a motorized wedge segment, and an orthogonal dynamic (delivered as if IMRT step-and-shoot) wedge segment [20]. Hence, the treatment planner has an additional degree of freedom, to first optimize the direction of the multileaf collimator (MLC) aperture (for optimal target coverage and risk-organ shielding) and then to optimize the wedge direction and angle.…”

Section: Methodsmentioning

confidence: 99%

Improving Dose Homogeneity in Large Breasts by IMRT

et al. 2008

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“…The wedge factor should be measured for various field sizes and at various depths, as required by various TPS and described in various publications. [181][182][183][184]…”

Section: Ivc4 Wedge Factorsmentioning

confidence: 99%

Accelerator beam data commissioning equipment and procedures: Report of the TG‐106 of the Therapy Physics Committee of the AAPM

Das

Cheng

Watts³

et al. 2008

Medical Physics

421

424

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For commissioning a linear accelerator for clinical use, medical physicists are faced with many challenges including the need for precision, a variety of testing methods, data validation, the lack of standards, and time constraints. Since commissioning beam data are treated as a reference and ultimately used by treatment planning systems, it is vitally important that the collected data are of the highest quality to avoid dosimetric and patient treatment errors that may subsequently lead to a poor radiation outcome. Beam data commissioning should be performed with appropriate knowledge and proper tools and should be independent of the person collecting the data. To achieve this goal, Task Group 106 (TG-106) of the Therapy Physics Committee of the American Association of Physicists in Medicine was formed to review the practical aspects as well as the physics of linear accelerator commissioning. The report provides guidelines and recommendations on the proper selection of phantoms and detectors, setting up of a phantom for data acquisition (both scanning and no-scanning data), procedures for acquiring specific photon and electron beam parameters and methods to reduce measurement errors (<1%), beam data processing and detector size convolution for accurate profiles. The TG-106 also provides a brief.discussion on the emerging trend in Monte Carlo simulation techniques in photon and electron beam commissioning. The procedures described in this report should assist a qualified medical physicist in either measuring a complete set of beam data, or in verifying a subset of data before initial use or for periodic quality assurance measurements. By combining practical experience with theoretical discussion, this document sets a new standard for beam data commissioning.

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Dynamic and omni wedge implementation on an Elekta SL linac

Cited by 6 publications

References 22 publications

Commissioning an Elekta Versa HD linear accelerator

Commissioning an Elekta Versa HD linear accelerator

Improving Dose Homogeneity in Large Breasts by IMRT

Accelerator beam data commissioning equipment and procedures: Report of the TG‐106 of the Therapy Physics Committee of the AAPM

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