The use of intensity-modulated radiation therapy photon beams for improving the dose uniformity of electron beams shaped with MLC

Mosalaei, H; Karnas, S; Shah, Sheel; Doodewaard, Sharon Van; Foster, T. F.; Chen, Jeff

doi:10.1016/j.meddos.2011.01.003

Cited by 8 publications

(10 citation statements)

References 25 publications

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“…A study 40 showed very good agreement between film and MAPCHECK results for IMRT quality assurance. A recent study 41 at our institution compared MAPCHECK results to film results using photon and electron beams, the results obtained were comparable.…”

Section: Iic1 Plan Deliverymentioning

confidence: 76%

Experimental assessments of intrafractional prostate motion on sequential and simultaneous boost to a dominant intraprostatic lesion

Abdellatif

Craig²,

Jensen

et al. 2012

Med. Phys.

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Section: Iic1 Plan Deliverymentioning

confidence: 76%

Experimental assessments of intrafractional prostate motion on sequential and simultaneous boost to a dominant intraprostatic lesion

Abdellatif

Craig²,

Jensen

et al. 2012

Med. Phys.

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“…On the other side, its usage is limited by the dependency of penumbra to the depth and influence of dose parameters of electron beam from the field size changing [3][4][5][6][7] . The issue of penumbra increment by depth is enhanced in some investigations by adding a narrow photon beam to the edge of the electron beam field 5 or mixing a low weight photon to electron beam field 4,8,9 . To our knowledge, no study on small fields for mixed electron and photon beam has been reported.…”

Section: Introductionmentioning

confidence: 99%

Production and dosimetry of simultaneous therapeutic photons and electrons beam by linear accelerator: A Monte Carlo study

Khledi¹,

Arbabi²,

Sardari³

et al. 2015

AIP Conference Proceedings

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Abstract. Depending on the location and depth of tumor, the electron or photon beams might be used for treatment. Electron beam have some advantages over photon beam for treatment of shallow tumors to spare the normal tissues beyond of the tumor. In the other hand, the photon beam are used for deep targets treatment. Both of these beams have some limitations, for example the dependency of penumbra with depth, and the lack of lateral equilibrium for small electron beam fields. In first, we simulated the conventional head configuration of Varian 2300 for 16 MeV electron, and the results approved by benchmarking the Percent Depth Dose (PDD) and profile of the simulation and measurement. In the next step, a perforated Lead (Pb) sheet with 1mm thickness placed at the top of the applicator holder tray. This layer producing bremsstrahlung x-ray and a part of the electrons passing through the holes, in result, we have a simultaneous mixed electron and photon beam. For making the irradiation field uniform, a layer of steel placed after the Pb layer. The simulation was performed for 10×10, and 4×4 cm2 field size. This study was showed the advantages of mixing the electron and photon beam by reduction of pure electron's penumbra dependency with the depth, especially for small fields, also decreasing of dramatic changes of PDD curve with irradiation field size.

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“…On the other side, its usage is limited by the dependency of penumbra to the depth and influence of dose parameters of electron beam from the field size changing (3)(4)(5)(6)(7)(8). The issue of penumbra increment by depth is enhanced in some investigations by adding a narrow photon beam to the edge of the electron beam field (5) or mixing a low weight photon to electron beam field (4,9,10). To our knowledge, no study on small fields for mixed electron and photon beam has been reported.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Simultaneous Photons and Electrons Beam by Monte Carlo Code

Khaledi

Arbabi

Sardari

et al. 2015

Rep Radiother Oncol

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Background: Depending on the location and depth of tumor, the electron or photon beams might be used for treatment. Electron beam have some advantages over photon beam for treatment of shallow tumors to spare the normal tissues beyond of the tumor. In the other hand, the photon beam are used for deep targets treatment. Both of these beams have some limitations, for example, the dependency of penumbra with depth, and the lack of lateral equilibrium for small electron beam fields. Objectives: In this study, improvement of the penumbra and Dmax changes will be investigated. Also the effects of cut-outs on the beam parameters prepared as well. Patients and Methods:In first, we simulated the conventional head configuration of Varian 2300 for 16 MeV electron, and the results approved by benchmarking the percent depth dose (PDD) and profile of the simulation and measurement. In the next step, a perforated Lead (Pb) sheet with 1 mm thickness placed at the top of the applicator holder tray. This layer producing bremsstrahlung x-ray and a part of the electrons passing through the holes, in result, we have a simultaneous mixed electron and photon beam. For making the irradiation field uniform, a layer of steel placed after the Pb layer. The simulation was performed for 10 × 10, and 4 × 4 cm 2 field size. Results: The measured R50 and RP for 10 × 10 cm2 field were 6.5 and 7.8 cm, respectively. The photon percentage for 1 mm thickness with 0.2, 0.3, and 0.5 cm holes diameter Lead layer target was about 33%, 32%, and 28% and for 2 mm targets punched with 0.2, 0.3, and 0.5 cm holes, the x-ray percentages were 43%, 41%, and 35%. Conclusions: This study showed the advantages of mixing the electron and photon beam by reduction of pure electron's penumbra dependency with the depth, especially for small fields, also decreasing of dramatic changes of PDD curve with irradiation field size.

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The use of intensity-modulated radiation therapy photon beams for improving the dose uniformity of electron beams shaped with MLC

Cited by 8 publications

References 25 publications

Experimental assessments of intrafractional prostate motion on sequential and simultaneous boost to a dominant intraprostatic lesion

Experimental assessments of intrafractional prostate motion on sequential and simultaneous boost to a dominant intraprostatic lesion

Production and dosimetry of simultaneous therapeutic photons and electrons beam by linear accelerator: A Monte Carlo study

Investigation of Simultaneous Photons and Electrons Beam by Monte Carlo Code

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