Guersen J.,Pole de Radiologie et Imagerie Medicale |
Cassagnes L.,Pole de Radiologie et Imagerie Medicale |
Cassagnes L.,French National Center for Scientific Research |
Mechin G.,Pole de Radiologie et Imagerie Medicale |
And 11 more authors.
Radioprotection | Year: 2014
The lens of the eye is a radiosensitive organ. In April 2011, the International Commission on Radiological Protection (ICRP) set the new threshold dose of occurrence of deterministic lens effects to 500 mGy. Patients with a ruptured intracranial aneurysm are imaged by CT scans of the brain (CT), for diagnosis and post-treatment follow-up; embolization is the standard treatment. These iterative examinations expose the lens to X-rays. This paper evaluates the lens X-ray exposure of 18 patients who underwent encephalic CT scans after a ruptured intracranial aneurysm in 2011, and proposes a method to reduce this exposure. In our study, 44% of patients received eye doses greater than 500 mGy, generated by CT examinations, especially cerebral CT perfusion, necessary to assess the risk of delayed vasospasm/ischemia. By positioning the patient in neck hyperflexion for cerebral CT perfusion, the dose could be reduced by around 50%. © EDP Sciences, 2014.