98th Annual Meeting DOG 2000

R 454

Three dimensional visualization of the ciliary body region in vivo using ultrasound

O. Stachs, A. Kirchhoff, J.Stave and R. Guthoff,

Purpose: The aim of this study is the development of a three dimensional high resolution tool kit to characterize the ciliary body and posterior iris in vivo. The results will be used for the ongoing studies of two dimensional biomicroscopy, especially regarding volume measurements and spherical ranging of structures and pathologic findings in this area.

Methods: An ultrasound biomicroscope (Humphrey Instruments, f=37 MHz, axial resolution 50m m) was extended with an additional computer controlled linear scanning device (HaSoTec-FG 30, Chemotaxis) across to the B-scan plane in the US probe. The dynamic B-scan images were recorded with a SVHS video system. The video sequences were digitized and prepared on a SGI workstation for input in the software package VoxelView for three dimensional visualization and evaluation.

Results: The ciliary body and the posterior iris region of human eyes were displayed in vivo in three dimensions. Volume measurements and spherical ranging are available.

Conclusions: The expanded ultrasound system offers a non-invasive in vivo possibility to preserve data of the ciliary body region in three dimensions in high resolution. Thus, the system provides a valuable tool for the exploration of the posterior iris. Furthermore, these data can be processed in computer simulation with regard to a better understanding of accomodation.

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