Standardized A-Scan Echography and Computerized Tomography for Evaluation of Orbital Disease

Abstract

Since the introduction of computerized tomography (Ambrose, 1973), many reports on the use of this newer examination technique for evaluation of orbital disorders have been published (Lloyd & Wright, 1974; Baker et al., 1974; Gawler et al., 1974; Wright et al., 1975; Grove et al., 1975; Nover et al., 1976; Wollensak et al., 1976; Bronner et al., 1976). Neuroradiologists easily overlook the fact that since the early sixties ophthalmologists have used high-frequency ultrasonography for demonstrating orbital soft tissue abnormalities. Baum & Greenwood (1960), Purnell (1969), and Coleman (1972) mainly advocated the use of immersion B-scan methods, whereas Ossoinig (1975) introduced standardized A-scan echography.