What is spectral domain OCT?
Optical coherence tomography (OCT) is a technique used to image intraocular tissue structures unreachable by other optical techniques or surgery. An ir laser beam is directed at the patient’s eye, with a reference beam aimed at a mirror.
What is Cirrus HD-OCT?
The Cirrus HD-OCT (Carl Zeiss Meditec, Dublin, CA) device is a spectral-domain optical coherence tomography system that allows faster data acquisition than the previous generation StratusOCT (Carl Zeiss Meditec, Dublin, CA), which is a time-domain device.
What is spectral domain?
The new spectral-domain (SD) OCT devices include a spectrometer in the receiver that analyzes the spectrum of reflected light on the retina and transforms it into information about the depth of the structures according to the Fourier principle.
What is another name for spectral domain OCT?
SD- OCT is also known as Fourier domain OCT because the distances are encoded in the Fourier transform of the frequencies of light reflected.
What is optic disc cube?
provides a unique view of the optic nerve head (ONH) for analysis. It captures a 6mm x 6mm data cube and automatically identifies the optic disc and cup boundaries. This data cube is comprised of 200 B-scans with 200 A-scans per B-scan, generating more than 40 million data points and is a key to the ONH analysis.
Which tool is best for utilized pigment epithelial detachment?
Measuring PED Using the same modality of analysis we used for drusen, we can use Cirrus HD-OCT to measure pigment epithelial detachments (PED), which is particularly useful after anti-VEGF therapy.
What is time-domain and spectral domain?
Put simply, a time-domain graph shows how a signal changes over time, whereas a frequency-domain graph shows how much of the signal lies within each given frequency band over a range of frequencies. The “spectrum” of frequency components is the frequency-domain representation of the signal.
What are the three types of Ophthalmic imaging?
In the past two decades eye care has seen the emergence of three major technologies for diagnostic imaging of the posterior segment of the eye: Scanning Laser Polarimetry (SLP), Confocal Scanning Laser Ophthalmoscopy (CSLO), and Optical Coherence Tomography (OCT).
What are the frequency-domain specifications?
The frequency domain specifications are resonant peak, resonant frequency and bandwidth.
Which is the next generation spectral domain technology?
Only four years later, several companies started to release the next generation technology, spectral-domain OCT (SD-OCT), AKA fourier-domain OCT, which improved upon TD-OCT by capturing more data in less time at a higher axial image resolution, around 5 µm.
What are the characteristics of Cirrus HD-Oct-Zeiss?
No Disease 2.5 µm AMD 8.7 µm Macular Edema 7.0 µm Diabetic Retinopathy 8.1 µm VRI Disorder 4.3 µm Source: 510(k) Summary: Cirrus HD-OCT with Retinal Nerve Fiber Layer and Macular Normative Databases, www.accessdata.fda.gov/cdrh_docs/pdf8/K083291.pdf. Receiver Operating Characteristic Curves, Normal vs. Glaucomatous Eyes
How is spectral domain optical coherence tomography used in glaucoma?
This is a review of the utility of spectral-domain optical coherence tomography in the diagnosis and management of glaucoma. It will provide a brief review of all modalities, but focus primarily on the Cirrus machine.
How is Cirrus used to diagnose retinal problems?
By utilizing precise macular thickness analyses, providing detailed ILM and RPE layer maps and putting more than 100 B-scans at your disposal, Cirrus provides the framework to assess your patient’s retinal condition. Track subtle macular change Cirrus data cubes are automatically registered with data from prior visits after the scan is acquired.