98th Annual Meeting DOG 2000

K 97

Three dimensional ultrasound findings of the posterior iris region

A. Kirchhoff, O. Stachs, V. P. Vick, R. Guthoff

Purpose: The ultrasound biomicroscopy introduced 1990 opens a better diagnosis of pathological findings of the "dead angle" of the eye. In previous investigations the existing system was extended using a three dimensional reconstruction system. The aim of this study was the assesment of the clinical relevancy of the developed 3D ultrasound biomicroscopy in specification of posterior iris pathologies and ciliary body alterations.

Methods: Through an extension of the existing ultrasound biomicroscopy system (Humphrey Instruments) a three dimensional visualization of the anterior eye section was possible. Using a three dimensional reconstruction technique of the B- scans was realized a visualization of posterior iris and ciliary body pathologies.

Results: The extended ultrasound system provides a three dimensional visualization of alterations of the posterior iris region, for instance iris cysts, ciliary body cysts and solid tumors of the ciliary body and the iris inclusive volume measurement of these structures. A limiting factor for the tumor visualization is the scan technique allowing only representation of structures with a maximal expansion of 5x5x5 mm.

Conclusions: The three dimensional ultrasound biomicroscopy provides extended diagnostic possibilities regarding iris and ciliary body pathologies. This method offers an improved assessment of the posterior surface of the iris as well as the ciliary body inclusive volume measurement.

Department of Ophthalmology, University of Rostock, Germany, 18055 Rostock, Doberaner Str. 140