Instructions for Use
2 Introduction
2660021169042 Rev. A 2018-03
2.6 PLEX® Elite 9000 Technology
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2.5.5 Conventions Used in This Document
Certain types of information are specially marked in this document
for better recognition.
• This is a list.
– This is a second level list.
This is a cross-reference: Questions and comments [
}
33]
.
This is
software code
or
program text
.
The name of software windows are capitalized. For example:
Patient Screen
Names of menus, and buttons or other selectable items, are shown
in
Bold
.
•
View
menu.
•
File > Save as
•
My documents > Documents
2.5.6 Questions and Comments
If you have questions or comments regarding this user documen-
tation, or about the device, contact ZEISS Service. Contact infor-
mation can be found at www.zeiss.com/med.
2.6 PLEX® Elite 9000 Technology
PLEX® Elite 9000 utilizes an interferometric technique that provides
three-dimensional structural information based on backscattered
infrared light. Tissue structure contrast is primarily provided by
differences in scattering intensity.
In low-coherence interferometry, light is sent along two optical
paths, one being the sample path (into the eye) and one being the
reference path of the interferometer. Light from the sample path is
delivered to the eye via the lateral scanning optics. The light from
the reference path and the reflected light from the sample path are
combined via a second fiber coupler and delivered to the detection
subsystem. When the optical path length of the reference and the
sample arm are matched, modulation fringes are generated on the
wavelength spectrum presented to the detection system. These are
analyzed using a fast Fourier transform (FFT) at each scanned point
on the retina. This makes it possible to sequentially examine the
reflectance from tissue at different axial locations (analogous to an
ultrasound A-scan). By moving the scanning spot laterally across
the eye, multiple A-scans can be acquired along the path traversed
by the spot (analogous to an ultrasound B-scan). The OCT image is
built up as the lateral scanning system moves the beam over the
length of the B-scan. The resulting tomograms are stored on the
computer or on an archive medium for later accessibility.
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