Calculation of size specific dose estimates (SSDE) value at cylindrical phantom from CBCT Varian OBI v1.4 X-ray tube EGSnrc Monte Carlo simulation based

Nasir, Muhammad Kamran Rasheed; Pratama, Defrianto; Anam, Khoirul; Haryanto, Freddy

doi:10.1088/1742-6596/694/1/012040

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…For constant exposure factors (such as tube voltage, tube current, pitch, and beam width), it had been reported by many authors that if the size of the patient decreases, the radiation dose increases [8,9]. The American Association of Physicists in Medicine (AAPM) [10] in 2011 issued a report estimating patient-specific dose in terms of size-specific dose estimate (SSDE) and emphasizing that the effective diameter of patient (D eff ) and the volume CT dose index (CTDI vol ) should be taken into consideration.…”

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confidence: 99%

The Evaluation of the Effective Diameter (Deff) Calculation and its Impact on the Size-Specific Dose Estimate (SSDE)

et al. 2017

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Effective diameter (D eff ) Size-specific dose estimate (SSDE) Volume CT dose index (CTDI vol ) CT scanner Information on the effective diameter (D eff ) is essential for estimating the dose for patients undergoing CT examinations. The purpose of this study was to calculate the effective diameter using the maximum values of lateral (LAT) and anteriorposterior (AP) diameters (D eff,m ) and using LAT and AP diameters taken from the center of the image (D eff,c ), and compare both estimates to the effective diameter calculated directly from the cross-sectional area of the patient (D eff,A ). We evaluated 164 patients who underwent the four most frequent CT examinations, namely pelvic, abdominal, thoracic, and head examinations, using a multi-detector CT (MDCT), the Toshiba Aquilion 128. We used the Wilcoxon-Mann-Witney U test to statistically determine whether differences were significant.

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confidence: 99%

The Evaluation of the Effective Diameter (Deff) Calculation and its Impact on the Size-Specific Dose Estimate (SSDE)

et al. 2017

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“…14 Accuracy of this conversion factor has been evaluated previously. 24 SSDE was calculated using Equation 4:…”

Section: Calculation Of Ssdementioning

confidence: 99%

An in-house step-wedge phantom for the calibration of pixel values in CT localizer radiographs for water-equivalent diameter measurement

Rif’ah

Anam

Sutanto

et al. 2023

Polish Journal of Medical Physics and Engineering

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Introduction: To develop an in-house acrylic-based step-wedge phantom with several thickness configurations for calibrating computed tomography (CT) localizer radiographs in order to measure the water-equivalent diameter (Dw) and the size-specific dose estimate (SSDE). Method: We developed an in-house step-wedge phantom using 3 mm thick acrylic, filled with water. The phantom had five steps with thicknesses of 6, 12, 18, 24, and 30 cm. The phantom was scanned using a 64-slice Siemens Definition AS CT scanner with tube currents of 50, 100, 150, 200, and 250 mA. The relationship between pixel value (PV) and water-equivalent thickness (tw) was obtained for the different step thicknesses. This was used to calibrate the CT localizer radiographs in order to measure Dw and SSDE. The results of Dw and SSDE from the radiographs were compared with those calculated from axial CT images. Results: The relationship between PV and tw from CT localizer radiographs of the phantom step-wedge produced a linear relationship with R2 > 0.990. The linear relationships of the Dw and SSDE values obtained from CT localizer radiographs and axial CT images had R2 values > 0.94 with a statistical test of p-value > 0.05. The Dw difference between those from CT localizer radiographs and axial CT images was 3.7% and the SSDE difference between both was 4.3%. Conclusion: We have successfully developed a step-wedge phantom to calibrate the relationship between PV and tw. Our phantom can be easily used to calibrate CT localizer radiographs in order to measure Dw and SSDE.

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“…The machines has high efficiency and has an overall reduction of computing time when compared with Microsoft Windows-based machines. The next efficiency step was to use more than one PC, all of which were arranged parallel to each other, as shown in Table 1 [19][20][21]. The software used to run in parallel was Sun Grid Engine (Grid cluster) [22].…”

Section: Parallel Computingmentioning

confidence: 99%

Monte Carlo Simulation-Based BEAMnrc Code of a 6 MV Photon Beam Produced by a Linear Accelerator (LINAC)

Sapundani

Ekawati²,

Wibowo

2021

Atom Indo.

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In radiotherapy, high energy ionizing radiation, such as X-rays, gamma rays and electron beams, is used. The dose in the tissue is often approached with the dose in the medium of the body which is 80 % of human soft tissue. It is often difficult to determine the dose because the interaction of materials in a medium is very random. Measurement is also quite difficult because there are almost no detectors that are tissue equivalent. Measurement using an ion chamber requires a lot of correction to obtain a dose in the tissue, which is done using phantom and not directly in humans. This research aimed to compare the absorbed dose between modelling using Monte Carlo simulation and experiments. The simulation of dose distribution produced by a 6 MV medical linear accelerator has been performed using BEAMnrc code running on Linux-based 2 processor system arranged in parallel. BEAMnrc was used to model and simulate the linac head with an SSD of 100 cm and Field size of 10x10 cm 2 . A phase-space file is obtained as input to a DOSXYnrc code to produce Percent Depth Dose (PDD) in water and polymethyl methacrylate (PMMA) phantoms. New particles formed (electrons: 0.2 %, photon: 0.17 %; and positron: 0.08 %) were far from the contamination threshold of 2 %. The range of the correction factor of the depth of a maximum dose compared to the experimental data was 0.04-0.15.

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Calculation of size specific dose estimates (SSDE) value at cylindrical phantom from CBCT Varian OBI v1.4 X-ray tube EGSnrc Monte Carlo simulation based

Cited by 7 publications

References 1 publication

The Evaluation of the Effective Diameter (<em>D<sub>eff</sub></em>) Calculation and its Impact on the Size-Specific Dose Estimate (<em>SSDE</em>)

The Evaluation of the Effective Diameter (<em>D<sub>eff</sub></em>) Calculation and its Impact on the Size-Specific Dose Estimate (<em>SSDE</em>)

An in-house step-wedge phantom for the calibration of pixel values in CT localizer radiographs for water-equivalent diameter measurement

Monte Carlo Simulation-Based BEAMnrc Code of a 6 MV Photon Beam Produced by a Linear Accelerator (LINAC)

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