Eye-lens bismuth shielding in paediatric head CT: artefact evaluation and reduction.
Background: CT scans of the brain, sinuses and petrous bones performed as the initial imaging test for a variety of indications have the potential to expose the eye-lens, considered among the most radiosensitive human tissues, to a radiation dose. There are several studies in adults discussing the r...
| Published in: | Pediatric Radiology Vol. 40; no. 11; pp. 1748 - 1755 |
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| Main Authors: | , , , , , , , |
| Format: | research Journal Article |
| Published: |
Springer Nature
Nov2010
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104928980&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104928980 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 03010449 O03 jtl: Pediatric Radiology issn: 03010449 maglogo: N pubinfo: dt: Nov2010 vid: 40 iid: 11 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 104928980 NLM20552187 2010810667 10.1007/s00247-010-1715-6 NLM20552187 104928980 ppf: 1748 ppct: 7 formats: fmt: @attributes: type: P tig: atl: Eye-lens bismuth shielding in paediatric head CT: artefact evaluation and reduction. aug: au: Raissaki M Perisinakis K Damilakis J Gourtsoyiannis N Raissaki, Maria Perisinakis, Kostas Damilakis, John Gourtsoyiannis, Nicholas affil: Department of Radiology, University Hospital of Heraklion, University of Crete, Faculty of Medicine, Stavrakia, Voutes, PO Box 2208, 71003 Heraklion, Crete, Greece sug: subj: Artifacts Metals Head Radiography Lens, Crystalline Orbit Radiography Radiologic Health Equipment and Supplies Radiographic Image Enhancement Equipment and Supplies Child Child, Preschool Female Human Male Radiation Dosage Radiographic Image Enhancement Methods Radiometry Tomography, X-Ray Computed Child: 6-12 years Child, Preschool: 2-5 years Female Male ab: Background: CT scans of the brain, sinuses and petrous bones performed as the initial imaging test for a variety of indications have the potential to expose the eye-lens, considered among the most radiosensitive human tissues, to a radiation dose. There are several studies in adults discussing the reduction of orbital dose resulting from the use of commercially available bismuth-impregnated latex shields during CT examinations of the head.Objective: To evaluate bismuth shielding-induced artefacts and to provide suggestions for optimal eye-lens shielding in paediatric head CT.Materials and Methods: A bismuth shield was placed over the eyelids of 60 consecutive children undergoing head CT. Images were assessed for the presence and severity of artefacts with regard to eye-shield distance and shield wrinkling. An anthropomorphic paediatric phantom and thermoluminescence dosimeters (TLDs) were used to study the effect of eye lens-to-shield distance on shielding efficiency.Results: Shields were tolerated by 56/60 children. Artefacts were absent in 45% of scans. Artefacts on orbits, not affecting and affecting orbit evaluation were noted in 39% and 14% of scans, respectively. Diagnostically insignificant artefacts on intracranial structures were noted in 1 case (2%) with shield misplacement. Mean eye-lens-to-shield distance was 8.8 mm in scans without artefacts, and 4.3 mm and 2.2 mm in scans with unimportant and diagnostically important artefacts, respectively. Artefacts occurred in 8 out of 9 cases with shield wrinkling. Dose reduction remained unchanged for different shield-to-eye distances.Conclusion: Bismuth shielding-related artefacts occurring in paediatric head CT are frequent, superficial and diagnostically insignificant when brain pathology is assessed. Shields should be placed 1 cm above the eyes when orbital pathology is addressed. Shield wrinkling should be avoided. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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