Superficial dose evaluation of four dose calculation algorithms

Cao, Ying; Yang, Xiao‐Yu; Yang, Zhen; Qiu, Xiaoping; Lv, Zhiping; Lei, Mingjun; Liu, Gui; Zhang, Zijian; Hu, Yongmei

doi:10.1016/j.radphyschem.2016.02.032

Cited by 16 publications

(14 citation statements)

References 26 publications

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“…The accuracy in calculating surface skin doses (build-up region) in tangential-like irradiation by commercial TPS photon algorithms is a critical issue. Several studies investigated the superficial dose prediction accuracy of CCC algorithm using different methods [23]. As a whole, those studies reported a tendency towards dose underestimation at depths lower than 2-6 mm.…”

Section: Discussionmentioning

confidence: 99%

Model-based approach for quantitative estimates of skin, heart, and lung toxicity risk for left-side photon and proton irradiation after breast-conserving surgery

et al. 2017

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Our analysis suggests that IMPT might be safely applied without increasing the risk of severe acute radiation induced skin toxicity. The quantitative risk estimates also support the potential clinical benefits of IMPT for left-side BC irradiation due to lower risk of cardiac and pulmonary morbidity. The applied approach might be relevant on the long term for the setup of cost-effectiveness evaluation strategies based on NTCP predictions.

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Section: Discussionmentioning

confidence: 99%

Model-based approach for quantitative estimates of skin, heart, and lung toxicity risk for left-side photon and proton irradiation after breast-conserving surgery

et al. 2017

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“…The uncertainty in the calculation accuracy of the surface dose of RTPS is well-known. 24 It has been reported that the CCC and AAA algorithms cannot correctly calculate the absorbed dose at a depth of 1 mm. 24 However, the calculation accuracy within the 3–5 mm depths was relatively better, and it was reported that the hair follicle exists at a depth of 3.5–4.2 mm from the skin surface.…”

Section: Discussionmentioning

confidence: 99%

Dosimetric investigation of whole-brain radiotherapy with helical intensity modulated radiation therapy and volumetric modulated arc therapy for scalp sparing

et al. 2023

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Objective: Intensity-modulated radiotherapy (IMRT) is a well-established radiotherapy technique for delivering radiation to cancer with high conformity while sparing the surrounding normal tissue. Two main purposes of this study are: (1) to investigate dose calculation accuracy of helical IMRT (HIMRT) and volumetric-modulated arc therapy (VMAT) on surface region and (2) to evaluate the dosimetric efficacy of HIMRT and VMAT for scalp-sparing in whole brain radiotherapy (WBRT). Methods: First, using a radiochromic film and water-equivalent phantom with three types of boluses (1, 3, 5 mm), calculation/measurement dose agreement at the surface region in the VMAT and HIMRT plans were examined. Then, HIMRT, 6MV-VMAT and 10MV-VMAT with scalp-sparing, and two conventional three-dimensional conformal radiotherapy plans (6MV-3DCRT and 10MV-3DCRT; as reference data) were created for 30 patients with brain metastasis (30 Gy/10 fractions). The mean dose to the scalp and the scalp volume receiving 24 and 30 Gy were compared. Results: The percentage dose differences between the calculation and measurement were within 7%, except for the HIMRT plan at a depth of 1 mm. The averaged mean scalp doses [Gy], V24Gy [%], and V30Gy [%] (1SD) for 6MV-3DCRT, 10MV-3DCRT, HIMRT, 6MV-VMAT, and 10MV-VMAT were [26.6 (1.1), 86.4 (7.3), 13.2 (4.2)], [25.4 (1.0), 77.8 (7.5), 13.2 (4.2)], [23.2 (1.5), 42.8 (19.2), 0.2 (0.5)], [23.6 (1.6), 47.5 (17.9), 1.2 (1.8)], and [22.7 (1.7), 36.4 (17.6), 0.7 (1.1)], respectively. Conclusion: Regarding the dose parameters, HIMRT achieved a lower scalp dose compared with 6MV-VMAT. However, the highest ability to reduce the mean scalp dose was showed in 10MV-VMAT. Advances in knowledge: Scalp-sparing WBRT using HIMRT or VMAT may prevent radiation-induced alopecia in patients with BM.

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“…The depth doses and dose profiles were measured with an ionization chamber (Semiflex 31010), because it has potential quality to get accurate dose distributions for photon beams ( 18 , 19 ). The chamber is driven by an electrical machine controlled by the scanning system (MEPHYSTO-mc 2 ) in a water phantom (MP3).…”

Section: Methodsmentioning

confidence: 99%

Benchmarking of electron beam parameters based on Monte Carlo linear accelerator simulation

Zhang¹,

Mi²,

Liu³

et al. 2020

Transl Cancer Res TCR

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Background:The main objective in this paper is to build up a simplified benchmarking procedure to determine the incident electron beam parameters independently using a Monte Carlo linear accelerator model.Methods: A 10×10 cm 2 field is used to acquire the parameters influences on the dose distributions for 6MeV megavoltage electron beams.Results: The calculated depth doses had no significant changes when the electron mean energy and radial intensity varied from 5.5-6.4 MeV and 0.1-0.4 cm respectively. And the dose profile simulated with an electron radial intensity among 0.0-0.19 cm had a good agreement with the measured dose profile in the main field, while obvious discrepancies happened in the penumbra region. The mean angular spread was found to be 0.3° to get good match between calculations and measurements at all interested depths.Conclusions: Accurate dose distributions are acquired by using the incident electron beam parameters benchmarked with the proposed procedure. As the percentage depth doses and dose profiles are insensitive to the electron energy and radial intensity correspondingly, they are feasible to benchmark individually.

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Superficial dose evaluation of four dose calculation algorithms

Cited by 16 publications

References 26 publications

Model-based approach for quantitative estimates of skin, heart, and lung toxicity risk for left-side photon and proton irradiation after breast-conserving surgery

Model-based approach for quantitative estimates of skin, heart, and lung toxicity risk for left-side photon and proton irradiation after breast-conserving surgery

Dosimetric investigation of whole-brain radiotherapy with helical intensity modulated radiation therapy and volumetric modulated arc therapy for scalp sparing

Benchmarking of electron beam parameters based on Monte Carlo linear accelerator simulation

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