Arrangement and method for determining the two-dimensional...

Image analysis – Applications – Biomedical applications

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C348S078000

Reexamination Certificate

active

07058212

ABSTRACT:
An arrangement and method for determining the two-dimensional distribution of fundus pigments, particularly of the xanthophyll macular pigment. The arrangement for carrying out the method comprises an illumination unit which illuminates the retina via an illumination beam path directed to the ocular fundus, observation optics located in the observation beam path proceeding from the ocular fundus, an image processing unit, elements for beam deflection and a central controlling and evaluating unit. In the method, a two-dimensional reflection image of the retina is recorded in a selected narrow-band wavelength region. In evaluating this two-dimensional reflection image, site-specific areas are established for determining the optical density and comparison values. The optical density of the fundus pigment at every fundus location is calculated from the negative logarithmic value of the quotient of the intensity value of the reflection image IR(λ)at this fundus site to a comparison intensity value of the reflection image IR(λ)Comparison. The suggested solution for the objective detection of the two-dimensional distribution of the optical density of the macular pigment xanthophyll is also suitable in principle for determining the distribution of other fundus pigments.

REFERENCES:
patent: 5873831 (1999-02-01), Bernstein et al.
patent: 6017122 (2000-01-01), Bone et al.
patent: 2003/0130579 (2003-07-01), McClane et al.
patent: 197 20 851 (1988-11-01), None
patent: 197 33 995 (1999-02-01), None
van de Kraats et al., “The Pathways of Light Measured in Fundus Reflectometry,”Vision Res., vol. 36, No. 15, pp. 2229-2247, 1996.
Berendschot et al., “Influence of Lutein Supplementation on Macular Pigment, Assessed with Two Objective Techniques,”Investigative Ophthalmology&Vision Science, Oct. 2000, vol. 41, No. 11, pp. 3322-3326.
Chang et al., “Retinal macular pigment distribution measured by imaging fundus reflectometry,”Proc. SPIE vol. 4625: Clinical Diagnostic Systems: Technologies and Instrumentation, Jan. 2002, pp. 170-178.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Arrangement and method for determining the two-dimensional... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Arrangement and method for determining the two-dimensional..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arrangement and method for determining the two-dimensional... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3655822

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.