Cataract Risk in a Cohort of U.S. Radiologic Technologists Performing Nuclear Medicine Procedures

Authored By:

Marie-Odile Bernier, Neige Journy, Daphnee Villoing, Michele M. Doody, Bruce H. Alexander, Martha S.Linet, Cari M. Kitahara

Summary:

 

In 2011, the International Commission on Radiological Protection (ICRP) made changes to their recommendations for the annual limit of ionising radiation exposure to the lens of the eye for occupational workers. The new limit was 20 mSv per annum, averaged over defined periods, with no year exceeding 50 mSv. This adjustment was due to epidemiological evidence relating to tissue reaction effects for doses to the lens of the eye and possible cataract formation.

 

Researchers in the USA carried out a prospective study in the years 2003-2005 and 2012-2013 and published the findings. The purpose of the research was to estimate the risk of cataract incidents in a cohort of nuclear medicine (NM) technologists based on their work histories and radiation protection practices. Findings indicated an increased risk of cataracts observed among U.S. radiologic technologists who had performed an NM procedure at least once. The study recommended future studies incorporating estimated lens doses.

Link to:

PUBMED

Published In:

Radiology: Vol 286: Number 2

Commentary by ARPANSA:

 

Previous work in the area of eye dosimetry internationally has been centred on image-guided x-ray interventional procedures (IGIP) that make use of high dose angiographic acquisitions and/or CT fluoroscopy guided interventions¹ with the emphasis for the need for optimisation of protection measures with respect to the lens of the eye. Recommendations that staff wear appropriate eye protection and use protective screens have been made. In Australia currently there is no requirement for medical staff to wear eye dosimeters to measure the radiation exposure to the lens of eye. Furthermore, no research has taken place to estimate the doses these people receive and in particular staff that use unsealed radiopharmaceuticals. Based on the published paper above, Australia may have an opportunity to contribute to international knowledge by carrying out clinical surveys and providing analysis of data from across the country.