Dosimetry Approach for a Retrospective Epidemiological Study On Eye Lens Dose to Interventional Cardiologists and the Occurrence of Radiation-Induced Lens Opacities
J Farah1*, L Struelens2, S Jacob1, M Schnelzer3, A Auvinen4, F Vanhavere2, I Clairand1, (1) French Institute for Radiological Protection and Nuclear Safety, BP-17 92260 Fonteay-aux-roses, France (2) Belgian Nuclear Research Centre, BE-2400 Mol, Belgium(3) Federal Office for Radiation Protection, 85764 Oberschleissheim,Germany(4) Finnish Radiation and Nuclear Safety Authority, 00881 Helsinki, FinlandTU-A-116-10 Tuesday 8:00AM - 9:55AM Room: 116
Purpose: Using whole body dosimetry data to carry out an epidemiological retrospective study on the relation between eye lens dose and lens opacities for interventional cardiologists.
Methods: In the framework of the European ELDO project, a method was developed to estimate cumulative eye lens doses for past practices based on whole body doses measured, for routine occupational dosimetry, above the lead apron. The investigation focused on identifying the ratio between eye lens dose and whole body dose measured with APDs at different positions on a Rando-Alderson phantom in realistic clinical settings. Besides, Monte Carlo simulations were performed to determine the variation of eye lens and whole body dose with tube configurations and with the use of ceiling shields and lead glasses. Another approach was also suggested to estimate eye lens dose when whole body doses above the apron are unavailable. It consists in using the European ORAMED eye lens doses database and accounting for the evolution of the X-ray systems and procedures over the last 50 years.
Results: First, ratios between eye lens doses and whole body doses (at different locations) were determined for procedures without the use of protective equipments. These ratios included different tube projections, tube configurations, beam energies and operator positions. Although eye lens dose correlated best with collar left dose, chest left measurement remains exploitable. Secondly, Monte Carlo simulations provided the necessary coefficients to correct the obtained ratios when protection equipments are used. Meanwhile, for the second approach, information was collected from the manufacturers on the evolution of X-ray systems to adjust recent eye lens dose values for procedures performed before the years 2000; a correction factor of 2 to 4 was thus identified.
Conclusion: This work suggests two methods to assess eye lens dose for retrospective epidemiological studies connecting lens opacities to eye exposure.
Funding Support, Disclosures, and Conflict of Interest: Research funded by the DoReMi Network of Excellence. No Discolusres, No conflict of interest.