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Impressum
Characterisation of the ciliary muscle function during accommodation using three dimensional ultrasound biomicroscopy
Stachs O., Kirchhoff A., Martin H., Hornych K., Stave J., Guthoff R.
University of Rostock, Department of Ophthalmology, Germany, 18057 Rostock, Doberaner Str. 140
Objective: The aim of this study was to investigate the benefit
of threedimensional high resolution ultrasonic imaging of the ciliary
body and its impact on improved monitoring of the ciliary muscle function
during accommodation.
Methods: An ultrasound-biomicroscope was extended to the third
dimension to visualize the ciliary body region in accommodation and disaccommodation
in three dimensions. Using this technique a total of 20 volunteers (aged
10-71 years) were examined during accommodation and disaccommodation with
different accommodative stimuli (pharmacologically and voluntary stimulated).
Ciliary muscle slices from the corresponding 3D volume of the ciliary
body region were separated using commercially available VoxelView®
software. Accommodative changes of the extracted muscle and the outer
contour were qualified with a self developed software tool for semiautomatic
contour approximation.
Results: Ciliary muscle slices can be separeted from the ciliary
body using 3D computer technique. An interindividual different anterior
shift of characteristical points of the muscle contour in the range of
1 mm was observed. Interindividual and age-related changes of the total
ciliary muscle contour were detected.
Conclusions: The expanded ultrasound system offers a non-invasive
possibility to obtain data of the ciliary body in three dimensions and
in high resolution in vivo. The possibility to obtain two-dimensional
images in any plane of 3D volume of the ciliary muscle improve the monitoring
of the muscle changes during accommodation and disaccommodation. The method
is qualified for characterisation and quantification of the individual
ciliary muscle activity. Age-related ciliary muscle changes can be assessed.