title: Comparison of eye-lens doses imparted during interventional and non-interventional neuroimaging techniques for assessment of intracranial aneurysms.
abstract: BACKGROUND
  A neurointerventional examination of intracranial aneurysms often involves the eye lens in the primary beam of radiation.
  
  
  OBJECTIVE
  To assess and compare eye-lens doses imparted during interventional and non-interventional imaging techniques for the examination of intracranial aneurysms.
  
  
  METHODS
  We performed a phantom study on an anthropomorphic phantom (ATOM dosimetry phantom 702-D; CIRS, Norfolk, Virginia, USA) and assessed eye-lens doses with thermoluminescent dosimeters (TLDs) type 100 (LiF:Mg, Ti) during (1) interventional (depiction of all cerebral arteries with triple 3D-rotational angiography and twice 2-plane DSA anteroposterior and lateral projections) and (2) non-interventional (CT angiography (CTA)) diagnosis of intracranial aneurysms. Eye-lens doses were calculated following recommendations of the ICRP 103. Image quality was analysed in retrospective by two experienced radiologists on the basis of non-interventional and interventional pan-angiography examinations of patients with incidental aneurysms (n=50) on a five-point Likert scale.
  
  
  RESULTS
  The following eye-lens doses were assessed: (1) interventional setting (triple 3D-rotational angiography and twice 2-plane DSA anteroposterior and lateral projections) 12 mGy; (2) non-interventional setting (CTA) 4.1 mGy. Image quality for depiction of intracranial aneurysms (>3 mm) was evaluated as good by both readers for both imaging techniques.
  
  
  CONCLUSIONS
  Eye-lens doses are markedly higher during the interventional than during the non-interventional diagnosis of intracranial aneurysms. For the eye-lens dose, CTA offers considerable radiation dose savings in the diagnosis of intracranial aneurysms.
authors.affiliation: Institute of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Guberina
authors.affiliation: Institute of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Dietrich
authors.affiliation: Institute of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Forsting
authors.affiliation: Institute of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Ringelstein
mesh_terms: D000328:Adult; D000368:Aged; D015901:Angiography, Digital Subtraction / Q000379:methods / Q000592:standards; D002533:Cerebral Angiography / Q000379:methods* / Q000592:standards; D000072226:Computed Tomography Angiography / Q000379:methods* / Q000592:standards; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods / Q000592:standards; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging*; D007908:Lens, Crystalline / Q000000981:diagnostic imaging*; D008875:Middle Aged; D059906:Neuroimaging / Q000379:methods* / Q000592:standards; D019047:Phantoms, Imaging / Q000592:standards; D011829:Radiation Dosage; D012189:Retrospective Studies
keywords: Aneurysm; CT Angiography; Intervention; Standards; Technique