1. How direct measurements of worker eyes with a Scheimpflug camera can affect lensdose coefficients in interventional radiology
- Author
-
Marco Bertolini, Antonella Sgura, Alessandra Palma, G. Cucchi, Vando Piccagli, Claudia Giliberti, Lidia Strigari, Daniela D'Alessio, Maria Grazia Romano, Sveva Grande, Mauro Iori, Marco Sumini, Antonella Rosi, Antonio Moramarco, Vicente Bruzzaniti, Luigi Fontana, Lorenzo Piergallini, Federica Fioroni, Agnese Chendi, Lorenzo Isolan, Ion Udroiu, Lorenzo Lasagni, Iori M., Isolan L., Piergallini L., Chendi A., Lasagni L., Cucchi G., Bertolini M., Fioroni F., Piccagli V., Moramarco A., Romano M.G., Fontana L., Strigari L., D'Alessio D., Bruzzaniti V., Sgura A., Udroiu I., Rosi A., Grande S., Palma A., Giliberti C., Sumini M., Iori, M., Isolan, L., Piergallini, L., Chendi, A., Lasagni, L., Cucchi, G., Bertolini, M., Fioroni, F., Piccagli, V., Moramarco, A., Romano, M. G., Fontana, L., Strigari, L., D'Alessio, D., Bruzzaniti, V., Sgura, A., Udroiu, I., Rosi, A., Grande, S., Palma, A., Giliberti, C., and Sumini, M.
- Subjects
genetic structures ,Scheimpflug principle ,Scheimpflug chamber ,Emmetropia ,len ,Radiology, Interventional ,Radiation Dosage ,law.invention ,Optics ,eye model ,law ,Occupational Exposure ,interventional radiology ,Lens, Crystalline ,Humans ,Dosimetry ,Radiation Dosimeter ,Monte Carlo ,Waste Management and Disposal ,Physics ,Dosimeter ,Radiation Dosimeters ,business.industry ,Public Health, Environmental and Occupational Health ,Radiant energy ,General Medicine ,eye diseases ,Lens (optics) ,Absorbed dose ,Radiation protection ,business ,radiation protection ,Monte Carlo Method ,Human - Abstract
The Directive 2013/59/Euratom established a reduction of the occupational exposure limits to the lens. Since it is become crucial to estimate the lens absorbed dose, the individual variability of exposed worker's ocular conformations with respect to the data estimated with their personal dosimetry has been studied. The anterior eye conformation of 45 exposed workers was acquired with Scheimpflug imaging and classified according to eye vision conditions (emmetropia, myopia or hypermetropia). Three eye models were computed, with two lens reconstructions, and implemented in an interventional radiology scenario by using Monte Carlo (MC) code. The models were dosimetrically analysed simulating setup A, a theoretical monoenergetic and isotropic photon's source (10-150 keV) and setup B, a more realistic interventional conditions with an angiographic X-ray unit (50, 75, 100 kV-peak). Scheimpflug imaging provided an average anterior chamber depth of (6.4 ± 0.5) mm and a lens depth of (3.9 ± 0.3) mm, together with a reconstructed equatorial lens length of (7.1 - 10.1) mm. Using this data for model's reconstruction, the dose conversion coefficients (DCs) for all ocular structures were simulated. Regardless of the eye model used, DCs show a similar trend with radiation energy which highlights, for the same energy and setup used, no significant dependence on ocular morphology and worker's visual conditions. The maximum difference obtained does not exceed 1% for all eye models or structures analysed. Therefore, the individual variabilities of worker ocular anatomy do not require any additional correction compared to the personal dosimetry data measured with a dedicated lens dosimeter. To estimate the absorbed dose to the other eye structures, it is essential instead to know the spectrum of the source that has generated the irradiation since there are differences considering monoenergetic sources or more realistic angiographic units.
- Published
- 2021
- Full Text
- View/download PDF