Development and Evaluation of a Thimble-Like Head Bolus Shield for Hemi-Body Electron Beam Irradiation Technique

Shin, Wook‐Geun; Lee, Sung Young; Jin, Haiyan; Kim, Jeongho; Kang, Sung Hak; Kim, Jung-In; Jung, Sung-Eun

doi:10.14407/jrpr.2022.00010

Cited by 3 publications

(3 citation statements)

References 18 publications

(18 reference statements)

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“…The mass density and effective atomic number of EcoFlex TM are 1.07 g/cm 3 and 11.66, respectively. The elemental composition (atomic weight, %) of EcoFlex TM 0020 is as follows: H (7.3), C (28.9), O (4.7), Na (0.2), and Si (58.9) [15,16]. In the study by Wang et al, dosimetric tests were conducted using the EcoFlex TM 0020.…”

Section: Fabrication Of a Patient-specific Bolus Using The Lc Methodsmentioning

confidence: 99%

“…For materials similar to water, it is straightforward to determine the depth of the maximum dose based on the thickness [14]. Silicone rubber has demonstrated biocompatibility in bolus applications and has been utilized in various instances within this field [14][15][16][17][18][19][20]. EcoFlex TM 0020 is marketed by the vendor as a "skin-safe" product [14].…”

Section: Fabrication Of a Patient-specific Bolus Using The Lc Methodsmentioning

confidence: 99%

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Feasibility of a Patient-Specific Bolus Using the Life-Casting Method for Radiation Therapy

Kim,

Park,

Park

et al. 2023

Applied Sciences

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Radiation therapy for treating shallow tumors is challenging, necessitating the use of boluses. This study introduces the first application of the life-casting method to fabricate patient-specific bolus molds from gypsum sheets, comparing them with commercial boluses. Our developed boluses reduced the air gap between the skin and bolus by 77.62% compared to that of commercial boluses. In vivo dosimetry using the patient-specific bolus demonstrated better results compared to using a commercial bolus. When using the commercial bolus, the mean %Diff and max %Diff were 1.10 ± 0.61%, respectively, and 2.00% for three-dimensional conformal radiation therapy (3D-CRT) and 7.19 ± 1.90% and 10.14% for volumetric modulated arc therapy (VMAT), respectively. Contrastingly, our developed bolus demonstrated more accurate dose delivery with a mean %Diff and max %Diff of 0.82 ± 0.61% and 1.69% for 3D-CRT and 3.42 ± 1.01% and 5.03% for VMAT, respectively. Furthermore, the standard deviation between the measurements was more than 50% lower when using a patient-specific bolus than when using a commercial bolus. These results show that our bolus reduces air gaps, improves the accuracy of bolus positioning, and enhances the precision of dose delivery compared with the performance of commercial boluses. Therefore, the developed bolus is expected to be valuable in clinical applications.

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Section: Fabrication Of a Patient-specific Bolus Using The Lc Methodsmentioning

confidence: 99%

Section: Fabrication Of a Patient-specific Bolus Using The Lc Methodsmentioning

confidence: 99%

Feasibility of a Patient-Specific Bolus Using the Life-Casting Method for Radiation Therapy

Kim,

Park,

Park

et al. 2023

Applied Sciences

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“…To address this limitation, our research has focused on developing an X-ray scanner that uses variable tube voltage according to the physical/chemical properties of the object being inspected [3]. To facilitate this, the design of an X-ray security scanner with variable tube voltage ranging from 80 to 160 kV was optimized using both Geant4 [4] and MCNP [5]. In the present study, our aim was to experimentally validate the reliability of the Monte Carlo simulation model for the X-ray security scanner.…”

Section: Introductionmentioning

confidence: 99%

Experimental validation of Monte Carlo simulation model for X-ray security scanner

Park,

An,

Yoon

et al. 2024

J. Inst.

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Transmission X-ray security scanners are deployed to detect smuggling of contraband articles, including weapons, narcotics, and explosives, for the purposes of homeland security. Current X-ray scanners use a fixed tube voltage (i.e., 160 kV); hence, they have a limitation in detecting thinly coated and/or low-density objects. To overcome this limitation, we are developing an X-ray scanner that applies variable tube voltage according to the physical/chemical properties of the object being inspected. To this end, in our previous study, Monte Carlo simulations with Geant4 (GEometry ANd Tracking4) and MCNP (Monte Carlo N Particle) were performed to optimize the design of the X-ray scanner for variable tube voltages. The MCNP was used to simulate the radiation generator for the X-ray source term, and the Geant4 was used to optimize the design of the dual-energy detector and to obtain the detector counts. In the present study, we experimentally validated the reliability of the Monte Carlo simulation model for the X-ray scanner. An 241Am source and a radiation generator were employed in this validation. For the 241Am source, the dual-energy detector signal was measured at a distance of 1 cm from the detector. In the case of the radiation generator, the source-to-object distance and the source-to-detector distance were 70 cm and 120 cm, respectively, as used in a typical X-ray security scanner. The tube voltage and the current were 140 kV and 10 mA, respectively. To obtain the X-ray images, the object was scanned while moving at a speed of 0.2 m/s on a conveyor system. The X-ray source term used in the simulation was obtained by monoenergetic-electron-beam bombardment onto the target. 4-D simulations were performed for the moving object. To validate the simulation model, we compared the simulated and measured image profiles, as well as the pixel counts of the dual-energy detector. The percent differences between the simulated and measured pixel counts and the image profiles were all within 5%. Thus, we concluded that our simulation model for the X-ray scanner can be considered to be reliable.

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Feasibility study of spent fuel internal tomography (SFIT) for partial defect detection within PWR spent nuclear fuel

Choi,

Park,

Cheon

et al. 2024

Nuclear Engineering and Technology

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Development and Evaluation of a Thimble-Like Head Bolus Shield for Hemi-Body Electron Beam Irradiation Technique

Cited by 3 publications

References 18 publications

Feasibility of a Patient-Specific Bolus Using the Life-Casting Method for Radiation Therapy

Feasibility of a Patient-Specific Bolus Using the Life-Casting Method for Radiation Therapy

Experimental validation of Monte Carlo simulation model for X-ray security scanner

Feasibility study of spent fuel internal tomography (SFIT) for partial defect detection within PWR spent nuclear fuel

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