Posterior segment laser scanning tomography: contour-line modulation in optic disk analysis

Reinhard O. W. Burk; Klaus Rohrschneider; Hans Eberhard Voelcker

doi:10.1117/12.23931

1 November 1990 Posterior segment laser scanning tomography: contour-line modulation in optic disk analysis

Reinhard O. W. Burk, Klaus Rohrschneider, Hans Eberhard Voelcker

Proceedings Volume 1357, Medtech '89: Medical Imaging; (1990) https://doi.org/10.1117/12.23931
Event: Medtech '89: Medical Imaging, 1990, Campinas, Brazil

Abstract

Laser scanning tomography is a technique for obtaining three-dimensional morphometric measurements in vivo. Beside " volumetric" parameters for optic disk analysis eg excavation volume maximal excavation depth or third moment of frequency distribution of excavation depth readings the evaluation of a new parameter the contour-line modulation is of special interest. The contour-line defines the disk border. In laser scanning tomography each pixel of the contourline is defined three-dimensionally. The contour-line modulation is the difference in height readings between the mean height position of the contour-line in the segment under investigation and the mean height position of the contour-line of an optic disk. We analysed a series of 27 control group eyes of 27 patients (C no defects in computerized static 30 degree visual field test octopus program 32 or 38) and 38 glaucoma eyes of 38 patients (G at least three points with a relative scotoma of -1 0dB loss or greater). Within the temporal 1 800 of the optic nerve head the contour-line modulation values were +79 m for the temporal superior octant (G) and +40 m for the temporal inferior octant (G) compared to the temporal quadrant and +1 71 pm for the temporal superior octant (C) and +1 34 tm for the temporal inferior octant (C) respectively . These data suggest that contour-line modulation values may be a quantitative structural parameter for nerve fiber bundle defects. Further studies

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Reinhard O. W. Burk, Klaus Rohrschneider, and Hans Eberhard Voelcker "Posterior segment laser scanning tomography: contour-line modulation in optic disk analysis", Proc. SPIE 1357, Medtech '89: Medical Imaging, (1 November 1990); https://doi.org/10.1117/12.23931

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KEYWORDS

Optical discs

Modulation

Laser scanners

Tomography

Image segmentation

3D scanning

Head

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