388 Chapter 14 · Appendix
Cirrus™ HD-OCT-Carl Zeiss Meditec
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Spectral-Domain |
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Stratus Time-Domain |
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Advantages of Spectral-Domain OCT |
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OCT |
OCT |
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Light source |
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840 nm |
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820 nm |
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High resolution |
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Detector |
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Spectrometer |
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Unique detector |
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Faster acquisition |
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Axial resolution |
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5-7 μm |
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10 μm |
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Better visualization of retinal layers |
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Transverse resolution |
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10 - 20 μm |
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20 μm |
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Number of A-scans per B-scan |
4,000 - 8,000 |
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512 |
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Better visualization of lesions |
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A-scan depth |
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2 mm |
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2 mm |
Slight improvement of light penetration |
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Number of A-scans per second |
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18,000 – 40,000 |
400 |
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Better registration, 3D analysis |
14
Main technical characteristics
▬Light source: superluminescent diode (SLD), 840 nm
▬Pupil diameter: Minimum: l 2.5 mm / Optimum: 3 mm
▬Scan speed: 27,000 A-scans per second
▬Field of view: 36° x 30°
▬Axial resolution: 5 μm in tissue
▬Transverse resolution: 20 μm in tissue
▬Fundus imaging
Light source: superluminescent diode (SLD), 750 nm
Live imaging during scanning Internal and external fixation
Focus adjustment range: -20 to +20 D
▬Retinal imaging
Retinal thickness mapping
3D retinal mapping
3D mapping of certain retinal layers
Carl Zeiss Meditec presents the advantages of the Cirrus™ HD-OCT as:
▬ High definition - High resolution |
▬ Compact |
▬ Easy image capture |
▬ Ergonomic |
Chapter 14 · Appendix |
389 |
14 |
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Cirrus™ HD-OCT-Carl Zeiss Meditec
The yellow square on the fundus image represents the limits of the cube analyzed (6 mm x 6 mm)
Precise localization of raster lines visible on the fundus image
Segmentation of the ILM and RPE (3D)
Segmentation of the ILM and RPE (3D
Segmentation of the ILM and RPE (3D)
LSLO fundus image with overlay on retinal thickness maps
Retinal fiber thickness measurements |
Detailed optic nerve head analysis |
Normative database for glaucoma |
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