Difference Between OCT Spectral and Time Domain

In time domain OCT, the depth information of the retina is collected as a function of time by moving the reference mirror. The reference mirror in spectral domain OCT, in contrast, is stationary. The light spectrum from the interferometer is detected by a spectrometer.

1. What is the difference between time domain and spectral domain OCT?
2. What is spectral domain OCT?
3. What is the spectral domain?
4. What is Fourier domain OCT?
5. What is swept source OCT?
6. How does optical coherence tomography work?
7. What is the purpose of an OCT test?
8. What can an OCT scan detect?
9. What is an OCT test used for?
10. What is spatial domain in image processing?
11. What is frequency domain and time domain?

What is the difference between time domain and spectral domain OCT?

Recently introduced spectral domain OCT (SD-OCT) measures the interferometric signal detected as a function of optical frequencies, allowing for imaging speeds 50 times faster than TD-OCT, and providing a greater number of images per unit area.

What is spectral domain OCT?

Optical coherence tomography (OCT) is a rapidly evolving, robust technology that has profoundly changed the practice of ophthalmology. Spectral domain OCT (SD-OCT) increases axial resolution 2- to 3-fold and scan speed 60- to 110-fold vs time domain OCT (TD-OCT).

What is the 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 Fourier domain OCT?

With the advent of Fourier-domain techniques, optical coherence tomography (OCT) has advanced from high-resolution 'point' imaging over small fields-of-view to comprehensive microscopic imaging over three-dimensional volumes that are comparable to the dimensions of luminal internal organs.

What is swept source OCT?

Swept-source OCT (SS-OCT; DRI-OCT, Topcon Japan) is the latest milestone in retinal and choroidal imaging. ... Simultaneous high-quality visualization of the vitreous, retina, and choroid is possible. Choroidal layers that are hardly distinguishable in conventional SD-OCT become visible.

How does optical coherence tomography work?

Optical coherence tomography (OCT) [1,2] is an imaging technique which works similar to ultrasound, simply using light waves instead of sound waves. ... Three-dimensional images can then be created by scanning the light beam laterally across the sample surface.

What is the purpose of an OCT test?

Optical Coherence Tomography (OCT) is a commonly performed diagnostic test designed to assist your doctor in identifying retinal diseases, such as age-related macular degeneration (AMD) or diabetic retinopathy (diabetic eye disease).

What can an OCT scan detect?

OCT is useful in diagnosing many eye conditions, including:

• macular hole.
• macular pucker.
• macular edema.
• age-related macular degeneration.
• glaucoma.
• central serous retinopathy.
• diabetic retinopathy.
• vitreous traction.

What is an OCT test used for?

What is Optical Coherence Tomography (OCT)? OCT is an imaging method used to generate a picture of the back of the eye, called the retina. The picture is made by precisely measuring the amount of a dim red light that reflects off the retina. OCT is routinely used to image the eyes of patients with glaucoma.

What is spatial domain in image processing?

The spatial domain is the normal image space, in which a change in position in I directly projects to a change in position in S. ... Distances in I (in pixels) correspond to real distances (e.g. in meters) in S.

What is frequency domain and time domain?

As stated earlier, a time-domain graph displays the changes in a signal over a span of time, and frequency domain displays how much of the signal exists within a given frequency band concerning a range of frequencies.