Absorption ratio of treatment couch and effect on surface and build-up region doses

Tuğrul, Taylan

doi:10.1016/j.rpor.2017.10.004

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Due to the large attenuation of the radiation at specific angles and positions of the treatment couch [7], without suitable couch modeling, the dose received by the patient during the treatment process is lower than the planned dose, reducing treatment effectiveness. Studies have shown that the treatment couch can increase the dose to the skin and may cause serious damage [8][9][10]. With the widespread use of IMRT technology, the complex multileaf collimator (MLC) motion puts forward higher requirements for the verification of the planned dose.…”

Section: Introductionmentioning

confidence: 99%

Effect of linear accelerator carbon fiber couch on radiotherapy dose

Kong

Dong

et al. 2022

PLoS ONE

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This study aimed to explore the effect of carbon fiber couch on radiotherapy dose attenuation and gamma pass rate in intensity-modulated radiotherapy (IMRT) plans. A phantom inserted with an ionization chamber was placed at different positions of the couch, and the dose was measured by the chamber. Under the same positioning, the phantom dose was calculated using the real and virtual couch images, and the difference in the planned dose of radiotherapy was compared. Ten clinical IMRT plans were selected as dose verification data, and the gamma pass rates were compared between couch addition and non-addition conditions. When the radiation field was near 110° and 250°, the measured value attenuation coefficient of the ionization chamber at the joint of the couch was up to 34%; the attenuation coefficient of the treatment couch from the actual couch image calculated using the treatment planning system (TPS) was up to 33%; the attenuation coefficient of the virtual couch calculated using the TPS was up to 4.0%. The gamma pass rate of the dose verification near gantry angles 110° and 250° was low, and that of the joint could be lower than 85% under the condition of 3%/3 mm. The gamma pass rates of the radiation field passing through the couch were all affected. The dose was affected by the radiation field passing through the couch, with the largest effect when passing through the joint part of the treatment couch, followed by that of the main couch plate and extension plate. When the irradiation field passed through the joint and near 110° and 250° of the main couch, the dose difference was large, making it unsuitable for treatment.

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Section: Introductionmentioning

confidence: 99%

Effect of linear accelerator carbon fiber couch on radiotherapy dose

Kong

Dong

et al. 2022

PLoS ONE

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“…It is argued that to contour immobilization devices in a TPS is not necessary, because these devices consist of lowdensity material. However, many studies have shown that immobilization devices may influence the dose distribution in a patient (Chen et al 2018;Tuğrul 2018;Gerig et al 2010;v et al 2002;v et al 2017;Wu et al 2006). However, studies examining this effect using different algorithms are limited in the literature.…”

Section: Introductionmentioning

confidence: 99%

Examination of the dosimetric effects of the headrest used in radiotherapy by different algorithms

Tuğrul¹

2021

European Journal of Science and Technology

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INTRODUCTION: The use of immobilization devices is imperative in radiotherapy to ensure proper positioning of the patient and correct application of the treatment. Headrests are frequently used to restrict the movement of a patient and to provide comfortable laying during the treatment. The aim of the present study was to examine the effect of a headrest on dose distribution by including the headrest in the body structure using two different algorithms. METHODS: The body structures on seven patient images were contoured with and without headrest. Dose distribution within the body was calculated for each patient using both Collapse Cone (CC) and Monte Carlo (MC) algorithms for cases where the headrest was included in the body structure and removed. The obtained results were compared with the gamma analysis method. RESULTS: The headrest has some effect on the dose distribution. Specifically, the results of the gamma analysis indicate that when the headrest was included in the body structure doses to the body were somewhat reduced. Since the CC algorithm does not allow calculation of secondary photons and scattered radiation sufficiently accurate in a low density environment, the similarity results of the CC algorithm were higher in the gamma analysis than those of the MC algorithm. DISCUSSION AND CONCLUSION: In order to accurately calculate the radiation dose, all the materials through which the radiation passes during the treatment must be specified in a treatment planning system. It is concluded that even if the immobilization devices are of low-density material, they have some effect on the dose distribution within a patient and should be included in the treatment planning system.

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Self‐Crosslinking AuNPs Composite Hydrogel Bolus for Radiophotothermal Therapy

Shi,

Lei,

Xia

et al. 2024

Macromol. Rapid Commun.

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Radiophotothermal therapy is a promising treatment for superficial tumors. Traditional radiotherapy requires tissue boluses on the patient's skin to increase therapeutic effectiveness due to the dose‐buildup effect of high‐energy radiation. However, combining radiotherapy with photothermal therapy leads to uncertainties as the low‐penetration near‐infrared light dose is reduced after penetrating the bolus. To enhance precision and effectiveness, this study introduces a novel bolus made of AuNPs@poly(AM‐THMA‐DMAEMA) composite hydrogel. This hydrogel is prepared through a one‐pot method involving the reduction of trihydrate chloroauric acid (HAuCl4·3H2O) and copolymerization of acrylamide (AM) and N‐[Tris(hydroxymethyl)methyl]acrylamide (THMA) in a redox system with dimethylaminoethyl methacrylate (DMAEMA) and potassium persulfate (KPS). The gold nanoparticles (AuNPs) improve the mechanical strength (tensile strength of 320.84 kPa, elongation at break of 830%) and antibacterial properties (>99% against Staphylococcus aureus). The local surface plasmon resonance (LSPR) effect of AuNPs enables the hydrogel to absorb near‐infrared light for precise monitoring of the infrared radiation dose. The hydrogel's biocompatibility is enhanced by the absence of additional crosslinking agents, and its excellent surface adhesion strength is due to numerous hydrogen bonds and electrostatic interactions. This study offers new possibilities for nanoparticle composite hydrogels as tissue boluses, achieving high precision and efficiency in radiophotothermal therapy.

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Absorption ratio of treatment couch and effect on surface and build-up region doses

Cited by 7 publications

References 18 publications

Effect of linear accelerator carbon fiber couch on radiotherapy dose

Effect of linear accelerator carbon fiber couch on radiotherapy dose

Examination of the dosimetric effects of the headrest used in radiotherapy by different algorithms

Self‐Crosslinking AuNPs Composite Hydrogel Bolus for Radiophotothermal Therapy

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