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Monte Carlo Simulation of Siemens ONCOR Linear Accelerator with BEAMnrc and DOSXYZnrc Code.

Jabbari K, Anvar HS, Tavakoli MB, Amouheidari A - J Med Signals Sens (2013)

Bottom Line: The results of simulation were validated by measurements in water by ionization chamber and extended dose range (EDR2) film in solid water.Square field size of 10 cm × 10 cm produced by the jaws was compared with ionization chamber and film measurements.The results are highly accurate and can be used for many applications such as patient dose calculation in treatment planning and in studies that model this linac with small field size like intensity-modulated radiation therapy technique.

View Article: PubMed Central - PubMed

Affiliation: Department of Medical Physics and Engineering, School of Medicine, Medical Image & Signal Processing Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.

ABSTRACT
The Monte Carlo method is the most accurate method for simulation of radiation therapy equipment. The linear accelerators (linac) are currently the most widely used machines in radiation therapy centers. In this work, a Monte Carlo modeling of the Siemens ONCOR linear accelerator in 6 MV and 18 MV beams was performed. The results of simulation were validated by measurements in water by ionization chamber and extended dose range (EDR2) film in solid water. The linac's X-ray particular are so sensitive to the properties of primary electron beam. Square field size of 10 cm × 10 cm produced by the jaws was compared with ionization chamber and film measurements. Head simulation was performed with BEAMnrc and dose calculation with DOSXYZnrc for film measurements and 3ddose file produced by DOSXYZnrc analyzed used homemade MATLAB program. At 6 MV, the agreement between dose calculated by Monte Carlo modeling and direct measurement was obtained to the least restrictive of 1%, even in the build-up region. At 18 MV, the agreement was obtained 1%, except for in the build-up region. In the build-up region, the difference was 1% at 6 MV and 2% at 18 MV. The mean difference between measurements and Monte Carlo simulation is very small in both of ONCOR X-ray energy. The results are highly accurate and can be used for many applications such as patient dose calculation in treatment planning and in studies that model this linac with small field size like intensity-modulated radiation therapy technique.

No MeSH data available.


Percentage depth dose results in different energy simulation at 6 MV beam and field size 10 cm × 10 cm, (a) 6.3 MeV, (b) 6.5 MeV, (c) 6.6 MeV, (d) 6.7 Mev
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Figure 3: Percentage depth dose results in different energy simulation at 6 MV beam and field size 10 cm × 10 cm, (a) 6.3 MeV, (b) 6.5 MeV, (c) 6.6 MeV, (d) 6.7 Mev

Mentions: Results the maximum statistical uncertainty in Monte Carlo calculations was 0.5%. Figure 3 illustrated the PDD obtained from simulation for the field 10 cm × 10 cm in 6 MV beams. The solid lines show the PDD's measured with ion chamber and the PDD's calculated by Monte Carlo simulation is represented as circles with dash lines. The 6 MV profile results were shown in Figure 4 and film measurement of profile was shown in Figure 5.


Monte Carlo Simulation of Siemens ONCOR Linear Accelerator with BEAMnrc and DOSXYZnrc Code.

Jabbari K, Anvar HS, Tavakoli MB, Amouheidari A - J Med Signals Sens (2013)

Percentage depth dose results in different energy simulation at 6 MV beam and field size 10 cm × 10 cm, (a) 6.3 MeV, (b) 6.5 MeV, (c) 6.6 MeV, (d) 6.7 Mev
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3959007&req=5

Figure 3: Percentage depth dose results in different energy simulation at 6 MV beam and field size 10 cm × 10 cm, (a) 6.3 MeV, (b) 6.5 MeV, (c) 6.6 MeV, (d) 6.7 Mev
Mentions: Results the maximum statistical uncertainty in Monte Carlo calculations was 0.5%. Figure 3 illustrated the PDD obtained from simulation for the field 10 cm × 10 cm in 6 MV beams. The solid lines show the PDD's measured with ion chamber and the PDD's calculated by Monte Carlo simulation is represented as circles with dash lines. The 6 MV profile results were shown in Figure 4 and film measurement of profile was shown in Figure 5.

Bottom Line: The results of simulation were validated by measurements in water by ionization chamber and extended dose range (EDR2) film in solid water.Square field size of 10 cm × 10 cm produced by the jaws was compared with ionization chamber and film measurements.The results are highly accurate and can be used for many applications such as patient dose calculation in treatment planning and in studies that model this linac with small field size like intensity-modulated radiation therapy technique.

View Article: PubMed Central - PubMed

Affiliation: Department of Medical Physics and Engineering, School of Medicine, Medical Image & Signal Processing Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.

ABSTRACT
The Monte Carlo method is the most accurate method for simulation of radiation therapy equipment. The linear accelerators (linac) are currently the most widely used machines in radiation therapy centers. In this work, a Monte Carlo modeling of the Siemens ONCOR linear accelerator in 6 MV and 18 MV beams was performed. The results of simulation were validated by measurements in water by ionization chamber and extended dose range (EDR2) film in solid water. The linac's X-ray particular are so sensitive to the properties of primary electron beam. Square field size of 10 cm × 10 cm produced by the jaws was compared with ionization chamber and film measurements. Head simulation was performed with BEAMnrc and dose calculation with DOSXYZnrc for film measurements and 3ddose file produced by DOSXYZnrc analyzed used homemade MATLAB program. At 6 MV, the agreement between dose calculated by Monte Carlo modeling and direct measurement was obtained to the least restrictive of 1%, even in the build-up region. At 18 MV, the agreement was obtained 1%, except for in the build-up region. In the build-up region, the difference was 1% at 6 MV and 2% at 18 MV. The mean difference between measurements and Monte Carlo simulation is very small in both of ONCOR X-ray energy. The results are highly accurate and can be used for many applications such as patient dose calculation in treatment planning and in studies that model this linac with small field size like intensity-modulated radiation therapy technique.

No MeSH data available.