Backscattered Dose Perturbation Effects at Metallic Interfaces Irradiated by High-Energy X- and Gamma-Ray Therapeutic Beams

Ravikumar, M; Ravichandran, R; Sathiyan, S; Supe, Sanjay S.

doi:10.1007/s00066-004-1162-0

Cited by 21 publications

(15 citation statements)

References 33 publications

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“…In previous studies, the values of the surface dose enhancement caused by backscatter radiation from DAs with compositions close to that of the dental Au–Ag–Pd alloy were reported to be in the 33–70% range [3–8]. Our result showed a lower surface dose enhancement than those found in previous studies.…”

Section: Resultscontrasting

confidence: 60%

A study on a dental device for the prevention of mucosal dose enhancement caused by backscatter radiation from dental alloy during external beam radiotherapy

Katsura

Utsunomiya

Abe

et al. 2016

Journal of Radiation Research

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The changes in dose distribution caused by backscatter radiation from a common commercial dental alloy (Au–Ag–Pd dental alloy; DA) were investigated to identify the optimal material and thicknesses of a dental device (DD) for effective prevention of mucositis. To this end, 1 cm3 of DA was irradiated with a 6-MV X-ray beam (100 MU) in a field size of 10 × 10 cm2 using a Novalis TX linear accelerator. Ethylene vinyl acetate copolymer, polyolefin elastomer, and polyethylene terephthalate (PET) were selected as DD materials. The depth dose along the central axis was determined with respect to the presence/absence of DA and DDs at thicknesses of 1–10 mm using a parallel-plate ionization chamber. The dose in the absence of DDs showed the lowest value at a distance of 5 mm from the DA surface and gradually increased with distance between the measurement point and the DA surface for distances of ≥5 mm. Except for PET, no significant difference between the DA dose curves for the presence and absence of DDs was observed. In the dose curve, PET showed a slightly higher dose for DA with DD than for DA without DD for thicknesses of ≥4 mm. The findings herein suggest that the optimal DD material for preventing local dose enhancement of the mucosa caused by DA backscatter radiation should have a relatively low atomic number and physical density and that optimal DD thickness should be chosen considering backscatter radiation and percentage depth dose.

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Section: Resultscontrasting

confidence: 60%

A study on a dental device for the prevention of mucosal dose enhancement caused by backscatter radiation from dental alloy during external beam radiotherapy

Katsura

Utsunomiya

Abe

et al. 2016

Journal of Radiation Research

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“…The backscatter dose enhancement and its prevention are of clinical interest and have been extensively studied. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) Here, we focus on those restorations which may come into contact with the oral mucosa. Farahani et al (1) performed experiments to measure the effects of various dental restoration materials on dose distribution: 18-karat gold alloy, Ag-Hg amalgam, Ni-Cr alloy, human tooth tissue, and soft-tissue-simulating polymer.…”

Section: Introductionmentioning

confidence: 99%

Effect of dental restorations and prostheses on radiotherapy dose distribution: a Monte Carlo study

Chin

Treister

Friedland

et al. 2009

J Applied Clin Med Phys

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Dental restorations, fixed prosthodontics, and implants affect dose distribution in head and neck radiation therapy due to the high atomic number of the materials utilized. The backscatter of electrons from metallic materials due to the impinging treatment x‐ray results in localized dose enhancements. These dose enhancements cause localized mucositis in patients who have dental work, a significant clinical complication. We investigated the backscatter effect of 23 configurations of dental work using the EGS4nrc Monte Carlo (MC) simulation system. We found that all‐metal fixed partial dentures caused the highest amount of dose enhancement – up to 33% – while amalgam restorations did not cause a significant amount. Restorations with a ceramic veneer caused up to 8% enhancement. Between 3 mm and 5 mm of water‐equivalent material almost completely absorbed the backscatter. MC simulations provide an accurate estimate of backscatter dose, and may provide patient‐specific estimates in future.

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“…Dose estimation uncertainty of ± 2% is necessary to deliver a uniform target dose within ± 5% for better tumor control [6,7,10,12,21,26,27,30]. Dosimetric studies involving TLD phosphors for radiation protection, film dosimetry at low level of radiation dose, nuclear medicine dosimetry, estimation of low -doses and few other research applications related to environmental dosimetry require few monitor unit (MU) settings of photon and electron beams in a linear accelerator.…”

Section: Introductionmentioning

confidence: 99%

Dose Delivery Accuracy of Therapeutic Photon and Electron Beams at Low Monitor Unit Settings

Ravikumar

Asmary²,

Sultan³

et al. 2005

Strahlenther Onkol

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Backscattered Dose Perturbation Effects at Metallic Interfaces Irradiated by High-Energy X- and Gamma-Ray Therapeutic Beams

Cited by 21 publications

References 33 publications

A study on a dental device for the prevention of mucosal dose enhancement caused by backscatter radiation from dental alloy during external beam radiotherapy

A study on a dental device for the prevention of mucosal dose enhancement caused by backscatter radiation from dental alloy during external beam radiotherapy

Effect of dental restorations and prostheses on radiotherapy dose distribution: a Monte Carlo study

Dose Delivery Accuracy of Therapeutic Photon and Electron Beams at Low Monitor Unit Settings

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