Magnetic resonance imaging and computed tomography for the detection and characterization of nonmetallic intraocular foreign bodies

Elad Moisseiev*, David Last, David Goez, Adiel Barak, Yael Mardor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To perform a comprehensive comparative analysis of nonmetallic intraocular foreign bodies (IOFBs) using computed tomography (CT) and magnetic resonance imaging (MRI).

Method: An ex vivo model of porcine eyes was used to study IOFBs consisting of 10 different materials: plastic, eyeglass lens, bottle glass, windshield glass, porcelain, gravel stone, concrete, wood, thorn, and pencil graphite. The study included 30 eyes with IOFBs and 6 control eyes. Each eye was scanned by CT and MRI. Images were analyzed by three-dimensional viewing software to determine distinguishing characteristics for each material.

Results: Analysis of MRI and CT scans yielded distinguishing characteristics for each of the 10 materials, and this information was integrated into a clinical algorithm that enables their distinction. More materials were identified by MRI than by CT, and smaller IOFB size was associated with lower detectability. Review of CT and head-coil MRI scans by masked specialists yielded a 95% agreement rate and allowed detection of most IOFBs.

Conclusion: Magnetic resonance imaging was superior to CT in IOFB detection. Using these modalities, a set of distinguishing characteristics was established for the identification of the 10 studied materials. We recommend MRI to be part of the evaluation of patients with a suspected IOFB, after CT to rule out metallic IOFBs.

Original languageEnglish
Pages (from-to)82-94
Number of pages13
JournalRetina
Volume35
Issue number1
DOIs
StatePublished - 3 Jan 2015

Keywords

  • computed tomography
  • intraocular foreign bodies
  • magnetic resonance imaging
  • nonmetallic

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