title: B-scan ultrasonography of eyes containing intravitreal gas.
abstract: Contact B-scan ultrasonography was performed on postoperative eyes containing intravitreal gas. Correlation of the ultrasonograms with the ophthalmoscopic findings disclosed that intraocular gas had a characteristic appearance on B-scan ultrasonography. Gas-fluid and gas-tissue interfaces were so highly reflective that no structures within or behind a bubble could be visualized. Shadowing, reverberation, and reflection artifacts were prominent, and dominated ultrasonographic findings. If the ultrasonographic characteristics of gas are understood, it is possible to use B-scan ultrasonography to determine if intraocular gas is present, whether there are one or several bubbles, and what percentage of the vitreous cavity is filled by gas. Specular reflection from a gas-fluid interface may be used to examine portions of the eye that might not otherwise be easily seen with ultrasonography.
authors.affiliation: Department of Ophthalmology, University of Kansas Medical Center, Kansas City 66103.
authors.forename: M M
authors.initials: MM
authors.lastname: Whitacre
mesh_terms: D005123:Eye / Q000000981:diagnostic imaging; D005466:Fluorocarbons / Q000008:administration & dosage; D005740:Gases; D006801:Humans; D011182:Postoperative Care; D012163:Retinal Detachment / Q000601:surgery; D014463:Ultrasonography; D014821:Vitrectomy; D014822:Vitreous Body / Q000000981:diagnostic imaging* / Q000378:metabolism
chemical_list: D005466:Fluorocarbons; D005740:Gases