Dosimetric Comparison between Monaco TPS and EGSnrc Monte Carlo simulation on Titanium Rod in 12bit and 16bit Image Format

Jayamani, J.; Osman, Noor Diyana; Tajuddin, A.A.; Noor, Noramaliza Mohd; Aziz, Mohd Zahri Abdul

doi:10.1080/16878507.2020.1754042

Cited by 6 publications

(9 citation statements)

References 18 publications

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“…Numerous studies have also employed EGSnrc MC simulation to evaluate the effect of hip prosthesis and compared to the TPS algorithms. Jayamani et al, [18] investigated the effect of titanium rod on 12-bit, 12bit extended and 16-bit depth CT data set for 6 MV photon beam using EGSnrc MC simulation and compared with Monaco TPS calculated dose. In their study, a wax phantom with a titanium rod was used to evaluate the dose at Dmax, at the entrance point before the titanium rod, at the point within the titanium and the exit point from the titanium rod.…”

Section: Resultsmentioning

confidence: 99%

Comparing film measurements and Monte Carlo simulations of dose delivered in a pelvic phantom with titanium hip prosthesis

Dumela,

Oderinde,

Usman

2023

J. Phys.: Conf. Ser.

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An increasing number of elderly prostate cancer patients with high-density material hip prostheses are referred for external beam Radiotherapy (EBRT). Radiation treatment of pelvis cancer patients with high-density hip prostheses needs special attention due to the artifacts created in the computed tomography (CT) field of view and the radiotherapy dosimetry challenges. This study investigated the pelvic prostate point dose with and without titanium hip prosthesis using a 0.6 cc PTW Farmer ionization chamber, EBT3 Gafchromic films, compared with the EGSnrc Monte Carlo (MC) simulation dose distribution. The doses were measured and simulated in a locally made pelvic phantom. MC and measured doses were compared with the Treatment Planning System (TPS) calculated prostate point dose. The ionization chamber, EBT3 Gafchromic films, and MC doses have a maximum deviation of 6.3 %, 5.7 %, and 7.4 % for 6 MV and 4.2 %, 4.7 %, and 5.5 % for 15 MV photon beam, respectively, when compared with TPS calculated dose. There is a significant difference between the prostate point dose measured with ionization chamber, EBT3 Gafchromic film in comparison MC simulated doses. The MC simulation dose shows the highest deviation especially on the lateral field passing through the prosthesis.

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Section: Resultsmentioning

confidence: 99%

Comparing film measurements and Monte Carlo simulations of dose delivered in a pelvic phantom with titanium hip prosthesis

Dumela,

Oderinde,

Usman

2023

J. Phys.: Conf. Ser.

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“…13 The Elekta Synergy Agility LINAC was modelled and validated in the recent publication. 14 Default PRESTA parameter for 6 MV photon beam was utilised with the energy cut-off for the electron, and photon was fixed to 0•7 MeV and 0•01 MeV, respectively. The phantom model was simulated in the EGSnrc code with 0•4 cm voxel size and was validated using the point dose measurement.…”

Section: Monte Carlo Simulation and Validationmentioning

confidence: 99%

Development and dosimetric evaluation of the IMRT prostate at outside-the-irradiated field in a heterogeneity male pelvis phantom

Jayamani

Osman

Tajuddin³

et al. 2022

J Radiother Pract

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Background: Intensity-modulated radiation therapy (IMRT) treatment delivery requires pre-treatment patient-specific quality assurance (QA) for the dosimetry verification due to its complex multileaf-collimator movement. The prostate target close position between the bladder and rectum requires a tight margin during planning, and mistreatment would have a huge impact on the patient. A commercially available QA tool consists of a homogeneous medium and does not represent an exact photon interaction on the tumour and also on the nearby healthy organ. Objective: A heterogeneous male pelvis phantom was developed and investigated the efficiency of the treatment planning system (TPS) calculation on the off-axis region. Methods: Polymethyl methacrylate was used for the phantom housing, and the material closed to the bladder, rectum and prostate density was chosen to construct the organ models. The phantom was scanned and validated by the computed tomography number and density. An IMRT treatment was planned in the Monaco TPS, and a thermoluminescent dosimeter (TLD-100) was used to validate the point dosimetry. In addition, an EGSnrc Monte Carlo simulation was carried out to validate the phantom dosimetry. Results & Discussion: The dose measurement between TLD-100, TPS, and EGSnrc was compared and validated in the pelvis phantom. In the prostate region, the dose difference was within ± 5%, and the maximum dose difference outside-the-irradiated field was up to 20·07 % and 47·31 % in TPS and TLD-100, respectively. Meanwhile, the measured dose was lower than the calculated dose, and it was apparent for the dose outside-the-irradiated field. Conclusion: The developed heterogeneity male pelvis phantom was validated and verified to be an important QA device for validating radiation dosimetry in the pelvis region. The dose outside-the-irradiated field was underestimated by both TPS and TLD, respectively.

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“…The incident electron kinetic energy and FWHM applied were 6.4 MeV and 1 mm, respectively, referring to previous publication. [ 19 ] The information about the particle histories including the particle's position, direction, and energy was stored in the phase-space file after the simulation process in BEAMnrc/EGSnrc was completed. Each field size produces a Phase-space file to analyze the S c , S cp values.…”

Section: Aterials and M Ethodsmentioning

confidence: 99%

Determination of the small-field output factor for 6 MV photon beam using EGSnrc Monte Carlo

2022

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Accuracy of ionization chamber (IC) to measure the scatter output factor (S cp ) of a linear accelerator (linac) is crucial, especially in small field (<4 cm × 4 cm). The common IC volume of 0.6 cc is not adequate for small-field measurement and not all radiotherapy centers can afford to purchase additional IC due to the additional cost. This study aimed to determine the efficiency of the EGSnrc Monte Carlo (MC) to calculate the S cp for various field sizes including small field in Elekta Synergy (Agility multileaf collimator) linac. The BEAMnrc and DOSXYZnrc user codes were used to simulate a 6 MV linac model for various field sizes and calculate the radiation dose output in water phantom. The modeled linac treatment head was validated by comparing the percentage depth dose (PDD), beam profile, and beam quality (Tissue Phantom Ratio (TPR) 20,10 ) with the IC measurement. The validated linac model was simulated to calculate the S cp consisting of collimator scatter factor (S c ) and phantom scatter factor (S p ). The PDD and beam profile of the simulated field sizes were within a good agreement of ±2% compared with the measured data. The TPR 20,10 value was 0.675 for field size 10 cm × 10 cm. The S cp , S c , and S p simulated values were close to the IC measurement within ±2% difference. The simulation for S c and S p in 3 cm × 3 cm field size was calculated to be 0.955 and 0.884, respectively. In conclusion, this study validated the efficiency of the MC simulation as a promising tool for the S cp calculation including small-field size for linac.

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Dosimetric Comparison between Monaco TPS and EGSnrc Monte Carlo simulation on Titanium Rod in 12bit and 16bit Image Format

Cited by 6 publications

References 18 publications

Comparing film measurements and Monte Carlo simulations of dose delivered in a pelvic phantom with titanium hip prosthesis

Comparing film measurements and Monte Carlo simulations of dose delivered in a pelvic phantom with titanium hip prosthesis

Development and dosimetric evaluation of the IMRT prostate at outside-the-irradiated field in a heterogeneity male pelvis phantom

Determination of the small-field output factor for 6 MV photon beam using EGSnrc Monte Carlo

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