Dosimetry of a new P‐32 ophthalmic applicator

Choi, Cheol Young; Han, Hye‐Jung; Son, Kwang-Jae; Park, Ul Jae; Lee, Jun Sig; Wee, Won Ryang; Ha, Sung Whan; Kim, Il Han; Ye, Sung-Joon

doi:10.1118/1.3644843

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Brachytherapy treatments can be classified according to different criteria including, implant methods, implant duration, loading systems, and radiation dose rate delivered by β and γ emission [3,4]. In comparison to the gamma emitter sources, β-emitters are proper candidates for some types of brachytherapy treatment (such as in intravascular coronary brachytherapy, treatment of metastatic uveal melanoma, and treatment of malignant hepatic lesions) due to the short range of electrons in tissue, resulting in a rapid decrease of deposited energy with a distance, with a sharp dose gradient [5,6]. 106Ru/106Rh, 90Sr/90Y, 90Y, and 32P are some common type of β-emitting radionuclides, which have good properties for the use in brachytherapy.…”

Section: Purposementioning

confidence: 99%

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Monte Carlo dosimetry for a new 32P brachytherapy source using FLUKA code

Rajabi¹,

Taherparvar²

2019

jcb

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PurposeDosimetric characterization of a new 32P brachytherapy source was studied and the validity of the FLUKA code to reproduce the dosimetric parameters in a water phantom was evaluated. In addition, dose rate distributions around the 32P source sheathed by a catheter and unsheathed source were investigated in different tissue phantoms.Material and methodsThe new 32P source was modeled using FLUKA Monte Carlo code. According to the AAPM TG-60 recommendations, reference of absorbed dose rate, radial dose function, anisotropy function, and an away-along table for quality assurance purposes inside water phantom were calculated. Moreover, the results of the radial dose function and dose rate were obtained for the sheathed source and unsheathed sources at radial distances in different tissue phantoms: liver, fat tissue, 9-component soft tissue, and 4-component soft tissue.ResultsThe calculated dosimetric parameters of the new 32P source by FLUKA code in water phantom agreed well with that of the GEANT4 calculation. The 2D away-along dose results were similar to the GEANT4 simulation for distances less than 0.25 cm, small differences were apparent at long distances from the source. Dose rate evaluation for the sheathed source shows that the presence of a catheter increases the dose values up to 2.11% in comparison with the unsheathed source in water phantom. Our results show that the radial dose function calculated in water, as generalized by AAPM TG-60, differed in tissue, especially at large distances from the source.ConclusionsThis work fully characterizes dosimetric parameters of the sheathed and unsheathed new 32P brachytherapy sources in water and different tissue phantoms by using FLUKA code. The results demonstrate that the dose distribution in water differed from the calculated ones in tissue phantoms due to the densities and atomic composition for tissues that are not taken account by the TG-60 formalism.

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Section: Purposementioning

confidence: 99%

“…Choi et al . [6] provided experimental simulation of the dosimetric characteristics of a new 32P ophthalmic applicator.…”

Section: Purposementioning

confidence: 99%

Monte Carlo dosimetry for a new 32P brachytherapy source using FLUKA code

Rajabi¹,

Taherparvar²

2019

jcb

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Report of AAPM Task Group 235 Radiochromic Film Dosimetry: An Update to TG‐55

et al. 2020

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The use of radiochromic film (RCF) dosimetry in radiation therapy is extensive due to its high level of achievable accuracy for a wide range of dose values and its suitability under a variety of measurement conditions. However, since the publication of the 1998 AAPM Task Group 55, Report No. 63 on RCF dosimetry, the chemistry, composition, and readout systems for RCFs have evolved steadily. There are several challenges in using the new RCFs, readout systems and validation of the results depending on their applications. Accurate RCF dosimetry requires understanding of RCF selection, handling and calibration methods, calibration curves, dose conversion methods, correction methodologies as well as selection, operation and quality assurance (QA) programs of the readout systems. Acquiring this level of knowledge is not straight forward, even for some experienced users. This Task Group report addresses these issues and provides a basic understanding of available RCF models, dosimetric characteristics and properties, advantages and limitations, configurations, and overall elemental compositions of the RCFs that have changed over the past 20 yr. In addition, this report provides specific guidelines for data processing and analysis schemes and correction methodologies for clinical applications in radiation therapy.

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