The contemporary JAEA Japanese voxel phantoms

Sato, Kaoru; Takahashi, Fumiaki

doi:10.1093/rpd/ncr405

Cited by 12 publications

(7 citation statements)

References 5 publications

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“…Table 2 summarizes the organ-absorbed dose per air kerma, i.e., organ-absorbed dose conversion factor, by tissue or organ for the Japanese male voxel phantom JM-103 ( Sato et al 2010 , 2011 ; Sato and Takahashi 2012 , 2017 ; Manabe et al 2014 ). In the case of AP irradiation in all tissues or organs, the lower the energy, the larger the organ-absorbed dose conversion factor.…”

Section: Resultsmentioning

confidence: 99%

“…The use of a Japanese adult male phantom was thought appropriate due to the difference in body size from that of a Caucasian male, which was the basis for RCP-AM. The JAEA has developed voxel phantom JM-103 using the average Japanese adult male height and weight ( Sato et al 2010 , 2011 ; Sato and Takahashi 2012 , 2017 ; Manabe et al 2014 ), which conformed to the reference voxel phantom RCP-AM defined in ICRP Publication 110 ( ICRP 2009 ). The height and weight of the RCP-AM were 176 cm and 73 kg, respectively, whereas those of the JM-103 were 170 cm and 64 kg.…”

Section: Methodsmentioning

confidence: 99%

“…Concerning the JAEA reports ( Sato et al 2010 , 2011 ; Sato and Takahashi 2012 , 2017 ; Manabe et al 2014 ), the ratio of an organ-absorbed dose based on the computational phantoms between RCP-AM and JM-103 by tissue or organ, photon energy (100, 150, 200, 300, 600, and 800 keV), and geometry (AP and ISO) was simulated using the general-purpose radiation transport code PHITS version 2.76, which was developed by the JAEA ( Sato et al 2018 ). Then, the ratios at energy levels of 119, 207, and 662 keV were interpolated.…”

Section: Methodsmentioning

confidence: 99%

“…The INWORKS also employed the updated conversion coefficients in ICRP Publication 116 ( ICRP 2010 ). In contrast, the J-EPISODE estimated a conversion coefficient from air kerma to an organ-absorbed dose based on JM-103, an adult male voxel phantom with average Japanese size ( Sato et al 2010 , 2011 ; Sato and Takahashi 2012 , 2017 ; Manabe et al 2014 ) that was developed by the JAEA based on ICRP Publication 110 ( ICRP 2009 ); and…”

Section: Introductionmentioning

confidence: 99%

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Organ Dose Reconstruction Applicable for a Japanese Nuclear Worker Cohort: J-EPISODE

et al. 2021

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An evaluation of cancer risk based on organ-absorbed dose is underway for the Japanese Epidemiological Study on Low-Dose Radiation Effects (J-EPISODE), which has analyzed health effects in association with radiation exposure evaluated with the personal dose equivalent H p (10). Although the concept of effective dose and its operational definition of H p (10) are widely used for radiological protection purposes, effective dose is not recommended for epidemiological evaluation. Organ-absorbed dose was instead adopted for the IARC 15-Country Collaborative study (15-Country study), the International Nuclear Workers Study (INWORKS), the Mayak worker study, and the Life Span Study (LSS) of atomic bomb survivors. The reconstruction method in J-EPISODE followed in principle the approach adopted in the 15-Country Study. As part of the approach of J-EPISODE, a conversion factor from photon dosimeter reading to air kerma was developed using dosimeter response data, which were measured by the experiment using an anthropomorphic phantom, and it was confirmed that the 15-Country study’s assumption of photon energy and geometry distribution in a work environment applied to Japanese nuclear workers. This article focuses on a method for reconstructing the conversion factor from photon dosimeter reading to organ-absorbed photon dose for a Japanese nuclear worker cohort. The model for estimating the conversion factor was defined under the assumption of a lognormal distribution from three concerned bias factors: (1) a dosimeter reading per air kerma, i.e., dosimeter response; (2) an organ-absorbed dose per air kerma; and (3) a factor relating to the differences in dose concepts and calibration practices between the roentgen dosimeter era and the present. Dosimeter response data were cited from the companion paper. Data on organ-absorbed photon dose per air kerma were estimated using a voxel phantom with the average Japanese adult male height and weight. The bias factor for the recorded dose in the roentgen era was defined, considering the backscatter radiation from the human body. The estimated values of organ-absorbed photon dose per air kerma were almost the same as those in ICRP Publication 116, revealing that the effect of differences in body size was almost negligible. The conversion factors from dosimeter reading to organ-absorbed dose were estimated by period (the roentgen era or from then), nuclear facility type (nuclear power plant or other), dosimeter type, and tissue or organ. The estimated conversion factors ranged from 0.7 to 0.9 (Gy Sv −1 ). The estimated cumulative organ-absorbed photon dose for the participants of J-EPISODE demonstrated that organ-absorbed dose values were approximately 0.8 times the recorded doses if neglecting dose-unit differences. J-EPISODE reconstructed an organ-absorbed dose conversion factor and will evaluate the risk of cancer mortality and morbidity using the organ-absorbe...

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Organ Dose Reconstruction Applicable for a Japanese Nuclear Worker Cohort: J-EPISODE

et al. 2021

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“…The MC-based CT dose calculator WAZA-ARIv2 provides comprehensive organ dose information for a patient according to the organ dose dataset produced by the MC simulation. In WAZA-ARIv2, the organ dose dataset for adult phantoms based on average Japanese developed by the Japan Atomic Energy Agency (JAEA) (Sato and Takahashi 2012) and for pediatric phantoms developed by the University of Florida (UF) (Lee et al 2006) are provided. In addition to the datasets for different ages (newborn, 1-, 5-, 10-, and 15-y-old), WAZA-ARIv2 also owns the dataset for three different body shapes for adult phantoms taking the body-shape into account.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Correction Methods Using Age and BMI for Estimating CT Organ Dose Using a Radiophotoluminescence Glass Dosimeter and a Monte Carlo-based Dose Calculator

Chang

Koba²

2021

Health Physics

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The size-specific dose estimates (SSDE) have been recommended to replace the volume computed tomography dose index (CTDIvol) because it takes patient size into account. On the other hand, organ dose is thought to be a more appropriate quantity in the radiation protection field due to its correlation with radiation risk. The web-based computed tomography (CT) dose calculator WAZA-ARIv2 only offers organ doses for adults with four different body shapes and for children with five different ages. Since the American Association of Physicists in Medicine (AAPM) offers the conversion factors for SSDE and the correlation of SSDE with organ dose has been demonstrated, implementation of the conversion table might improve the accuracy of WAZA-ARIv2. This study aimed to evaluate a body mass index (BMI)-based and age-based correction method for estimation of the organ dose by using a radiophotoluminescence dosimeter (RGD), an anthropomorphic phantom, and the dose calculator WAZA-ARIv2. RGDs were individually calibrated by using an ISOVOLT TITAN-320 x-ray generator. The ratio of the SSDE conversion factors (CFSSDE) was used as the comparison index. For the BMI-based correction method, the ratio of CFSSDE values for the adult phantoms was expected to be 1.065, and the average ratio of the organ doses for the adult phantoms was 1.163 ± 0.169. For the age-based correction method, the ratio of CFSSDE value for 5- and 10-y-old pediatric phantoms was expected to be 0.889, and the ratios of the organ doses were 0.866 ± 0.024 and 0.909 ± 0.047 for the WAZA-ARIv2 dosimetry system and RGD dosimetry system, respectively. In conclusion, both evaluations of the experimental results showed the consistency between WAZA-ARIv2 and the SSDE conversion factor table. Moreover, the importance of taking the measurement position into account when applying the mass attenuation coefficient was demonstrated according to this study.

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Novel method for calculating the effective dose using size-specific dose estimates conversion factors in abdomen–pelvis computed tomography

Funashima,

Abiko,

Sato

2023

Radiol Phys Technol

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The contemporary JAEA Japanese voxel phantoms

Cited by 12 publications

References 5 publications

Organ Dose Reconstruction Applicable for a Japanese Nuclear Worker Cohort: J-EPISODE

Organ Dose Reconstruction Applicable for a Japanese Nuclear Worker Cohort: J-EPISODE

Evaluation of the Correction Methods Using Age and BMI for Estimating CT Organ Dose Using a Radiophotoluminescence Glass Dosimeter and a Monte Carlo-based Dose Calculator

Novel method for calculating the effective dose using size-specific dose estimates conversion factors in abdomen–pelvis computed tomography

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