Dose conversion coefficients for electron exposure of the human eye lens

Behrens, R.; Dietze, G.; Zankl, M.

doi:10.1088/0031-9155/54/13/008

Cited by 85 publications

(117 citation statements)

References 8 publications

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“…It is considered that the mathematical model used in traditional articles by P. Nogueira et al (2011) [20] and R. Behrens (2009) [21] was better than the mathematical model developed in this study in terms of geometrical elements and material composition. However, whereas the mathematical model for eyes was restricted in one and the traditional studies were performed by preparing a model of the orbit (the bone structure surrounding the eyes), this study intended to perform a more practical study with a model more properly suited to evaluate the radiation exposure of the eyes accompanying a brain CT by preparing two eyes along with the cranium (brain part).…”

Section: Composition Of the Mathematical Phantommentioning

confidence: 72%

Evaluation of radiation exposure upon visual organs during a head CT scan

Kim

Lim

Chung

2012

Journal of Nuclear Science and Technology

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In order to analyze and compare the absorbed radiation dose and dose rate of visual organs (eyes, corneas, and lenses) of the head with the surrounding areas of the head during CT scans, a mathematical head phantom was created. In addition, the amount of radiation exposure reduced when using an eye shield was also analyzed. According to the results, it was found that the absorbed dose was highest when using 120 kV (as compared to 80 kV and 100 kV) and the absorbed dose rate of the visual organs compared to the head was about 1.35% for the eyes, 0.9% for the corneas, and 0.095% for the lenses. Finally, it was shown that the dose reduction rate of each organ when using an eye shield was about 24% for the eyes, about 22% for the corneas, and more than 40% for the lenses.

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Section: Composition Of the Mathematical Phantommentioning

confidence: 72%

Evaluation of radiation exposure upon visual organs during a head CT scan

Kim

Lim

Chung

2012

Journal of Nuclear Science and Technology

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“…As aforementioned, when the spatial distribution of radiation in the organ is very non-uniform, an average of the dose is not necessarily indicative of the potential damage to the organ (Behrens et al 2009). So, to graphically display a dose map in the model, energy deposition was calculated using the track length rectangular mesh tally.…”

Section: Monte Carlo Dose Estimation Methodsmentioning

confidence: 99%

“…In recent years, different eye models were presented based on the differences in sensitivity of eye zones (Alghamdi et al 2007;Behrens et al 2009;Nogueira et al 2011;Caracappa et al 2014). Till now, these models have been widely used for calculation of dose conversion coefficients of the eye lens (Behrens et al 2009;Behrens and Dietze 2010;Nogueira et al 2011;Manger et al 2012;Sakhaee et al 2015;Vejdani-Noghreiyan and EbrahimiKhankook 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Till now, these models have been widely used for calculation of dose conversion coefficients of the eye lens (Behrens et al 2009;Behrens and Dietze 2010;Nogueira et al 2011;Manger et al 2012;Sakhaee et al 2015;Vejdani-Noghreiyan and EbrahimiKhankook 2016). One of the most detailed models is the one designed by Nogueira and co-workers, in which lens cells were divided into sensitive and insensitive, and GZ was considered as the sensitive zone to ionizing radiation (Nogueira et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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The effects of simulating a realistic eye model on the eye dose of an adult male undergoing head computed tomography

Akhlaghi

Ebrahimi-Khankook

Vejdani-Noghreiyan

2017

Radiat Environ Biophys

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In head computed tomography, radiation upon the eye lens (as an organ with high radiosensitivity) may cause lenticular opacity and cataracts. Therefore, quantitative dose assessment due to exposure of the eye lens and surrounding tissue is a matter of concern. For this purpose, an accurate eye model with realistic geometry and shape, in which different eye substructures are considered, is needed. To calculate the absorbed radiation dose of visual organs during head computed tomography scans, in this study, an existing sophisticated eye model was inserted at the related location in the head of the reference adult male phantom recommended by the International Commission on Radiological Protection (ICRP). Then absorbed doses and distributions of energy deposition in different parts of this eye model were calculated and compared with those based on a previous simple eye model. All calculations were done using the Monte Carlo code MCNP4C for tube voltages of 80, 100, 120 and 140 kVp. In spite of the similarity of total dose to the eye lens for both eye models, the dose delivered to the sensitive zone, which plays an important role in the induction of cataracts, was on average 3% higher for the sophisticated model as compared to the simple model. By increasing the tube voltage, differences between the total dose to the eye lens between the two phantoms decrease to 1%. Due to this level of agreement, use of the sophisticated eye model for patient dosimetry is not necessary. However, it still helps for an estimation of doses received by different eye substructures separately.

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“…Geometrical eye models represented by some spheres have been developed by Behrens et al [4,5] to calculate the dose for the eye lens. In ICRP Publication 116, dose conversion coefficients for electrons calculated using the voxel phantom and the eye lens model developed by Behrens et.…”

mentioning

confidence: 99%

Calculation of equivalent dose for the lens of the eye in a positron field using EGS5

Yokoyama

Aoki

2014

Progress in Nuclear Science and Technology

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The equivalent dose rate per positron fluence for the human eye lens is calculated using a Monte Carlo simulation code, EGS5, with two mathematical models (a computational head voxel phantom and a simple eye model). The eye lens doses for medical staff and carers as received from a radiopharmaceutical such as 18 F-FDG, which is used in PET examinations, when spilled on the floor, and from positrons passing through a thin injection tube are calculated using a simple eye model. At energies less than 1 MeV, the equivalent dose for the eye lens per electron and positron fluence as calculated using the simple eye model was a maximum of three orders of magnitude lower than that for the head voxel phantom. These values for the simple eye model were equal to the calculation results obtained using the eye lens model in ICRP Publication 116 and those reported in past studies. The eye lens dose rates from the point and tube sources of 18 F-FDG as calculated using our simple eye model are about 0.57 and 0.37 Sv min −1 MBq −1 at 5 cm, respectively. The doses at 10 cm were one-third to half of those at 5 cm.

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Dose conversion coefficients for electron exposure of the human eye lens

Cited by 85 publications

References 8 publications

Evaluation of radiation exposure upon visual organs during a head CT scan

Evaluation of radiation exposure upon visual organs during a head CT scan

The effects of simulating a realistic eye model on the eye dose of an adult male undergoing head computed tomography

Calculation of equivalent dose for the lens of the eye in a positron field using EGS5

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