Kontrola Systemów Planowania Leczenia 3D W Radioterapii Wiązkami Zewnętrznymi Fotonów I Elektronów

Dybek, Marcin; Winiecki, Janusz; Iwanicki, Tomasz; Janiszewska, M.; Kabat, Damian; Kukołowicz, Paweł; Litoborski, M.; Minczewska, Joanna; Raczkowski, Maciej

doi:10.2478/pjmpe-2014-0001

Cited by 6 publications

(11 citation statements)

References 18 publications

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“…The differences between the calculations and measurements were assessed using the criteria proposed by PSMP [13]. In these recommendations, it is proposed to apply different criteria for areas in which there is a high and low dose gradient.…”

Section: Evaluation Of the Results Obtainedmentioning

confidence: 99%

“…Before commissioning the treatment planning system for clinical applications, it is necessary to verify the accuracy of calculations. The scope and method of the control system for planning treatment is defined in the recommendations prepared by different organizations [9][10][11][12][13][14]. The results of the comparison calculations performed using the Monte Carlo algorithm were implemented in the Varian Eclipse treatment planning system, carried out in accordance with the recommendations published by the Polish Society of Medical Physics [13].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the usefulness of the electron Monte Carlo algorithm for planning radiotherapy with the use of electron beams

Łukomska

Kukołowicz

Zawadzka

et al. 2016

Polish Journal of Medical Physics and Engineering

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The aim of the study was to verify the accuracy of calculations of dose distributions for electron beams performed using the electron Monte Carlo (eMC) v.10.0.28 algorithm implemented in the Eclipse treatment planning system (Varian Medical Systems). Implementation of the objective of the study was carried out in two stages. In the first stage the influence of several parameters defined by the user on the calculation accuracy was assessed. After selecting a set of parameters for which the best results were obtained a series of tests were carried. The tests were carried out in accordance with the recommendations of the Polish Society of Medical Physics (PSMP). The calculation and measurement of dose rate under reference conditions for semi quadratic and shaped fields were compared by individual cut-outs. We compared the calculated and measured percent depth doses, profiles and output factors for beams with an energy of 6, 9, 12, 15 and 18 MeV, for semi quadratic fields and for three different SSDs 100, 110, and 120 cm. All tests were carried out for beams generated in the Varian 2300CD Clinac linear accelerator. The results obtained during the first stage of the study demonstrated that the highest compliance between the calculations and measurements were obtained for the mean statistical uncertainty equal to 1, and the parameter responsible for smoothing the statistical noise defined as medium. Comparisons were made showing similar compliance calculations and measurements for the calculation grid of 0.1 cm and 0.25 cm and therefore the remaining part of the study was carried out for these two grids.In stage 2 it was demonstrated that the use of calculation grid of 0.1 cm allows for greater compliance of calculations and measurements. For energy 12, 15 and 18 MeV discrepancies between calculations and measurements, in most cases, did not exceed the PSMP action levels. The biggest differences between measurements and calculations were obtained for 6 MeV energy, for smallest fields and large SSD distances. Despite these discrepancies between calculations the model was adopted for clinical use.

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Section: Evaluation Of the Results Obtainedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of the usefulness of the electron Monte Carlo algorithm for planning radiotherapy with the use of electron beams

Łukomska

Kukołowicz

Zawadzka

et al. 2016

Polish Journal of Medical Physics and Engineering

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“…The treatment planning system was commissioned before implementation for clinical applications. The national and international recommendations for quality control of computerized treatment planning systems were used 16–18 . The narrow range of 1.2°–2.0° control point spacing per segment was used for treatment planning.…”

Section: Methodsmentioning

confidence: 99%

“…The national and international recommendations for quality control of computerized treatment planning systems were used. [16][17][18] The narrow range of 1.2 • -2.0 • control point spacing per segment was used for treatment planning. It depended on the number of control points (98 or 178) and arc lengths (full or partial arcs).…”

Section: Treatment Plansmentioning

confidence: 99%

Comparison of calculation algorithms to predict the IQM detector response for various modulation degrees of VMAT treatment plans on linear accelerator equipped with the HD120 MLC

Janiak

Kukołowicz

2021

Medical Physics

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Purpose The calculation model for the integral quality monitor (IQM) system does not take into account the characteristics of the HD120 multileaf collimator (MLC), which some Varian accelerators are equipped with. Some treatment plans prepared with this collimator are characterized by a high level of modulation. The aim of the work was to prepare a model for that collimator and to determine the influence of modulation on results of the verification carried out with the use of IQM system. Methods The short and long stabilities of the IQM detector response were verified by measuring the signal for a 6 MV flattening filter‐free (FFF) beam with the static field of 10 × 10 cm2 size. The obtained results were compared with the measurements performed with the PTW Farmer chamber. Next, the signals for 35 static square fields 4 × 4 cm2, covering the whole field 38 × 20 cm2, were measured with the IQM. Based on the results of these measurements, the original calculation model has been changed in order to achieve the smallest differences between calculations and measurements. While tuning the model, the characteristics of the HD120 MLC were included. Measurements were performed for 30 clinical plans (86 arcs) prepared with 6 MV FFF beams. Among those 30 plans, there were were multitarget plans with single isocenter. For each plan, the modulation complexity score (MCS) was calculated. The measurement results were compared with the calculation results performed with the original and authors’ calculation model. Results Very good stability of the short and long stabilities of the IQM detector response was obtained. Measurements performed for 35 static fields revealed that for the manufacturer's and for the authors’ models, the deviation exceeded 3% for 12 and five of the 35 static fields, respectively. The differences for the manufacturer's and authors’ algorithms were in the range of ±2% for the 15 and 26 of the fields, respectively. For original and the authors’ models, the differences between measured and calculated signals (starting with the segment number 40) were within the range of ±3.5% for 87.6% and 96.7% of all arcs for the respective models. For both models, the dependence of the compliance of measurements and calculations on the MCS was observed. For most of the very modulated arcs, the measured signal was at least 3% lower than the calculated one. The largest differences between measurements and calculations were obtained for single‐isocenter multitarget plans. Conclusions The signal predicted by an algorithm taking into account the real geometry of the collimating system of the Edge accelerator (equipped with the HD120 MLC) made it possible to obtain greater consistency between the measurements and calculations. We characterized the dependence between the MCS of each arc and the compliance of the measurements and calculations. Much worse results were obtained for single‐isocenter multitarget plans.

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“…There are international recommendations specifying the extent to which particular quantities should be checked [ 1 , 2 ]. A few years ago, national recommendations were developed under the patronage of the Polish Society of Medical Physics [ 3 ]. The tests proposed in the literature concern various aspects of treatment planning: tests of computer equipment and peripheral devices (printers, plotters, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of optional measurement parameters in the Eclipse treatment planning system on the quality of the dosimetric model of the biomedical accelerator using the Acuros XB algorithm

Gadek

Wendykier

Grządziel

et al. 2022

Rep Pract Oncol Radiother.

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Kontrola Systemów Planowania Leczenia 3D W Radioterapii Wiązkami Zewnętrznymi Fotonów I Elektronów

Cited by 6 publications

References 18 publications

Evaluation of the usefulness of the electron Monte Carlo algorithm for planning radiotherapy with the use of electron beams

Evaluation of the usefulness of the electron Monte Carlo algorithm for planning radiotherapy with the use of electron beams

Comparison of calculation algorithms to predict the IQM detector response for various modulation degrees of VMAT treatment plans on linear accelerator equipped with the HD120 MLC

Influence of optional measurement parameters in the Eclipse treatment planning system on the quality of the dosimetric model of the biomedical accelerator using the Acuros XB algorithm

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