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Eye lens irradiation by CT perfusion Dosimetry and optimization [Irradiation des cristallins des patients par scanners de perfusion itératifs Dosimétrie et optimisation]

Résumé : 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.
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https://hal.archives-ouvertes.fr/hal-02614031
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Submitted on : Wednesday, May 20, 2020 - 3:57:28 PM
Last modification on : Thursday, May 21, 2020 - 1:40:54 AM

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J. Guersen, L. Cassagnes, G. Méchin, C. Etard, J.-L. Rehel, et al.. Eye lens irradiation by CT perfusion Dosimetry and optimization [Irradiation des cristallins des patients par scanners de perfusion itératifs Dosimétrie et optimisation]. Radioprotection, 2014, 49 (3), pp.195-199. ⟨10.1051/radiopro/2014005⟩. ⟨hal-02614031⟩

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