IMRT Commissioning and Verification Measurements on Siemens (ARTISTE)Linear Accelerator

Dawod, Tamer; Rostom, Yousri; Abouzeid, Mahmoud

doi:10.21608/resoncol.2012.438

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…45 Some studies have applied the gamma index method to quantitatively compare measured and calculated dose distributions. 44,[46][47][48][49][50][51][52][53][54] According to this method, the difference between the measured and the calculated dose distributions is obtained using Eq. 1:…”

Section: Analysis Of Resultsmentioning

confidence: 99%

Evaluation of dose calculation accuracy of a commercial radiotherapy treatment planning system for adjacent radiation fields

et al. 2023

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Background: Adjacent radiation fields are applied in some radiotherapeutic cases. When using these radiation fields, considerable dose errors across the junction of radiation fields are possible. Therefore, it is necessary to evaluate the accuracy of the dose calculated by treatment planning system (TPS) when using the adjacent radiation fields. The present study aimed to quantify the dose calculation accuracy of ISOgray TPS for the photon-photon adjacent fields. Materials and methods: To assess the accuracy of dose calculations, the dose profiles were first measured by a Semiflex ionization chamber at 1, 1·5, 5 and 10 cm depths for different field sizes (6 × 6, 10 × 10 and 20 × 20 cm2), source to surface distances (SSDs) (90, 100 and 110 cm) and beam angles (0º, 15º, 30º and 45º). In the second step, the data at corresponding depths were extracted from the ISOgray TPS. Finally, the dosimetric performance of TPS was evaluated using a gamma index analysis. Results: The overall dose calculation accuracy of ISOgray TPS was within the acceptable range for the build-up region (with acceptance criteria of dose difference (DD) = 15% and distance to agreement (DTA) = 3 mm) and the depths after the build-up region (with acceptance criteria of DD = 5% and DTA = 3 mm). Moreover, the overall accuracy of dose calculations was not affected by the field size and the SSD. It was also shown that the accuracy of dose calculations was similar for the adjacent radiation fields with beam angles of 0º, 15 º and 30 º, while a considerable decrease in the pass rate values is obtained for the adjacent radiation field with 45 º beam angle. A more detailed analysis of the findings revealed that the accuracy of dose calculations in the match line regions of the adjacent radiation fields for 1 cm beam profiles was within the acceptable range; however, it declined for other depths. Conclusions: The findings showed that the overall dose calculation accuracy of ISOgray TPS was acceptable for evaluated adjacent radiation fields. However, the accuracy of dose calculations in the match line regions of the adjacent radiation fields for the depth after build-up was not within the acceptable range.

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Section: Analysis Of Resultsmentioning

confidence: 99%

Evaluation of dose calculation accuracy of a commercial radiotherapy treatment planning system for adjacent radiation fields

et al. 2023

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“…Intensity Modulated Radiation Therapy (IMRT) is one of the best radiotherapy techniques used for lung cancer therapy because of its ability to increase the dose to the cancer target by minimizing the surrounding healthy tissue [1]. The IMRT technique applies the concept of radiation irradiation that is controlled by a computer program automatically and avoids normal tissue, in contrast to conventional trial and error approaches to achieve optimal radiation therapy planning [2][3]. In general, a radiotherapy plan is aligned with a trial-and-error approach and still involves non-intuitive, iterative steps based on the subjective decision of the planner [4][5].…”

Section: Introductionmentioning

confidence: 99%

Homogeneity and Conformity of Neural Network-Based Lung-IMRT Planning

Aini

Sihono

Valerian

et al. 2022

J. Phys.: Conf. Ser.

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The IMRT planning technique applies the concept of irradiation, which is controlled automatically by a computer. An IMRT plan is aligned with a trial-and-error approach and still involves non-intuitive, iterative steps based on the planner’s subjective decision. The Neural Network method is used in radiotherapy planning in determining IMRT plans in lung cancer cases. This method is used to predict dose distribution based on previous planning data. The purpose of using this neural network method is to predict the dose distribution in the PTV volume with validation in the previous plan, also predicting the dose distribution for doses that cover 95% of the target volume. So, this can make it easier for a planner to make decisions objectively. The obtained results show that the quality of planning produced based on neural network modelling has a homogeneity index (HI) of 0,09 ± 0,02, and the conformity index (CI) of 1,2 ± 0,27 with an average dose 1,02 ± 0,01 was the mean received at the target organ. The maximum dose to the at-risk right lung organ is 0,82 ± 0,22 Gy, the left lung is 0,75 ± 0,29 Gy, the heart is 0,77 ± 0,14 Gy, and the spinal cord is 0,50 ± 0,14 Gy.

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IMRT Commissioning and Verification Measurements on Siemens (ARTISTE)Linear Accelerator

Cited by 2 publications

References 22 publications

Evaluation of dose calculation accuracy of a commercial radiotherapy treatment planning system for adjacent radiation fields

Evaluation of dose calculation accuracy of a commercial radiotherapy treatment planning system for adjacent radiation fields

Homogeneity and Conformity of Neural Network-Based Lung-IMRT Planning

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