Evaluation and Commissioning of Commercial  Monte Carlo Dose Algorithm for Air Cavity

Miura, Hideharu; Masai, Norihisa; Yamada, Kazutoyo; Sasaki, Junichi; Oh, Ryoong‐Jin; Shiomi, Hiroya; Usmani, Muhammad Nauman; Inoue, Toshihiko

doi:10.4236/ijmpcero.2014.31002

Cited by 4 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hideharu Miura et al examined dose distribution in the presence of air cavities suggesting that dose reduction occurs right before the air cavity [2], which is in line with the present study. Results of this study indicate an increase in the maximum spot of the dose in the presence of cavity, which is in line with the results reported by Behrens.…”

Section: Discussionsupporting

confidence: 91%

“…Over the past years, the assessment of the effect of air inhomogeneities on absorbed dose has been the subject of research in many empirical studies using the Monte Carlo simulation. In fact, the Monte Carlo simulation is one of the most J Biomed Phys Eng 2019; 9 (1) www.jbpe.org Seif F. et al accurate calculation methods for radiotherapy dose [2,3]. In the studies carried out in this field, the occurrence of disorders due to the air inhomogeneities close to the intersection of air-tissue, and consequently, overdose and underdose in the surrounding areas have been reported [4][5][6][7][8][9][10].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Investigating the Effect of Air Cavities of Sinuses on the Radiotherapy Dose Distribution Using Monte Carlo Method

Seif¹,

Bayatiani²,

Hamidi³

et al. 2019

J Biomed Phys Eng

View full text Add to dashboard Cite

Background: Considering that some vital organs exist in the head and neck region, the treatment of tumors in this area is a crucial task. The existence of air cavities, namely sinuses, disrupt the radiotherapy dose distribution. The study aims to analyze the effect of maxillary, frontal, ethmoid and sphenoid sinuses on radiotherapy dose distribution by Monte Carlo method.Materials and Methods: In order to analyze the effect of the cavities on dose distribution, the maxillary, frontal, ethmoid and sphenoid sinus cavities were simulated with (3×3.2×2) cm3, (2×2×3.2) cm3, (1×1×1.2) cm3 and(1×1×2) cm3 dimensions.Results: In the analysis of the dose distribution caused by cavities, some parameters were observed, including: inhomogeneity of dose distribution in the cavities, inhomogeneity of dose on the edges of the air cavities and dispersion of the radiations after the air cavity. The amount of the dose in various situations showed differences: before the cavity a 0.64% and a 2.76% decrease, a 12.06% and a 17.17% decrease in the air zone, and a 2.25% and a 5.9% increase after the cavity.Conclusion: The results indicate that a drop in dose before the air cavities and in the air zone occurs due to the lack of scattered radiation. Furthermore, the rise in dose was due to the passage of more radiation from the air cavity and dose deposition after the air cavity. The changes in dose distribution are dependent on the cavity size and depth. As a result, this has to be noted in the treatment planning and MU calculations of the patient.

show abstract

Section: Discussionsupporting

confidence: 91%

mentioning

confidence: 99%

Investigating the Effect of Air Cavities of Sinuses on the Radiotherapy Dose Distribution Using Monte Carlo Method

Seif¹,

Bayatiani²,

Hamidi³

et al. 2019

J Biomed Phys Eng

View full text Add to dashboard Cite

show abstract

“…Based on our design, the mouthpiece airway was the primary effect on dose distribution. Miura et al studied the dose distribution of photon beams in air cavities, and the results indicated that the dose was reduced before entering the air cavity [18]. Seif et al also studied the effect of the air in sinus cavities on radiation dose.…”

Section: Discussionmentioning

confidence: 99%

Design of 3D-printed universal oral stent for tongue immobilization in head and neck radiotherapy

Mundee¹,

Jongwannasiri²,

Fuangrod³

2022

Biomed. Phys. Eng. Express

View full text Add to dashboard Cite

The primary treatment for head and neck cancer is radiotherapy, which can cause complications and effects, such as the ability to speak, taste, produce saliva, and swallow. An oral stent is an immobilization tool for minimizing the dose in the tongue (or hard palate) by locking the tongue position during radiation delivery. It can improve the treatment accuracy due to less uncertainty caused by tongue position uncertainty between treatment fractions. However, commercial oral stents are not widely adopted in developing countries due to their unaffordable price. This study aimed to design the universal oral stent (UOS) to achieve high efficiency, ease to use, and low-cost fabrication based on 3D printing technology. There were five experiments to evaluate the UOS design and fabrication versus the modified cut syringe, including finite element analysis (FEA), the usability test, the micro Vickers hardness test, single beam dose analysis, and dose calculation on treatment plan simulations. The proposed UOS design and fabrication presented a high capability to apply for clinical use.

show abstract

“…Behrens et al studied the build-up effects behind air cavities using Monte Carlo (MC) simulations and concluded that build up effects should be taken into consideration when choosing the accelerator energies with the increasing use of IMRT and radiosurgery and small fields[44]. It was also…”

mentioning

confidence: 99%

Study of Tissue Inhomogeneity Effects on Central Axis Radiation Beam Parameters using Monte Carlo Methods

2020

Int J Med Res Rev

View full text Add to dashboard Cite

Introduction: The central axis radiation beam parameters are used for the dose calculations inradiotherapy and usually measured in a homogeneous medium. Human body is not homogeneous innature and the incident beam has to travel through different medium such as bone tissue air etc toreach the tumor. Objective: The objective of the present work is to study the effects of tissueInhomogeneity on central axis beam parameter such as percentage Depth Dose using Monte CarloMethods Materials and Methods: The Monte Carlo simulation is a virtual experiment and can beconducted with the Monte Carlo software tool installed in a PC. Input files are written as per thespecification of the Monte Carlo code. Two radiation beams beans commonly used for radiationtreatment such as Cobalt 60 and 6MV X ray were used for the simulation. Results: Depth Dosecharacteristics in homogeneous tissue medium for Cobalt60 and 6MV X rays beams were studied andis consistent with the published experimental values.In the second case, at the interface betweentissue and bone the PDD pattern changed as reported by the previous works. And the absorbed doseat bone layer is higher than the dose value predicated in a homogeneous condition. In the nextsimulation we conducted the simulation for a tissue air tissue medium. Conclusion: The presentstudy clearly demonstrate that Monte Carlo methods simulation can be used as a tool for estimationof dose in tissue Inhomogeneity where measurements are seldom possible.

show abstract

Evaluation and Commissioning of Commercial Monte Carlo Dose Algorithm for Air Cavity

Cited by 4 publications

References 15 publications

Investigating the Effect of Air Cavities of Sinuses on the Radiotherapy Dose Distribution Using Monte Carlo Method

Investigating the Effect of Air Cavities of Sinuses on the Radiotherapy Dose Distribution Using Monte Carlo Method

Design of 3D-printed universal oral stent for tongue immobilization in head and neck radiotherapy

Study of Tissue Inhomogeneity Effects on Central Axis Radiation Beam Parameters using Monte Carlo Methods

Contact Info

Product

Resources

About