Image processing algorithms of the retinal thickness analyzer

摘要

The retinal thickness analyzer (RTA) is an ophthalmic imaging instrument for the measurement and mapping of the thickness of the retina. The RTA is based on the principle of optical triangulation.A laser beam. Which is offset from the optical axis of the eye, is projected onto the retina so that it hits the retina at an angle relative to the optical axis. The light reflected back from this beam at the retina is imaged onto a CCD camera through an off-axis aperture opposite the offset of the incident beam. This cause the ligth reflected from different layers of the retina to be offset in the image. The size of the offset of light from a retina layer is a measure of the depth of the layer in the retina.