Computed tomography visible light

3.2.
The back reflected waves are analyzed and their delay is measured to reveal the depth in which the reflection occurred.
OCT uses light in the near-infrared, which travels much faster than ultrasound.
The delays of the back-reflected waves cannot be measured directly, so a reference measurement is used.
What are the light sources in OCT?
Most OCT systems use four major types of light sources: superluminescent diodes (SLDs), ultrafast lasers, SC sources, and swept sources..
What is the light source for OCT?
OCT relies on low coherence interferometry utilizing spectrally broad light sources like superluminescent diodes or femtosecond lasers..
What type of light does a CT scan use?
However, CT scans use x-rays, and all x-rays produce ionizing radiation.
Ionizing radiation has the potential to cause biological effects in living tissue.
This is a risk that increases with the number of exposures added up over the life of an individual..
What type of light does an OCT use?
Optical coherence tomography (OCT) is a non-invasive technique for cross-sectional tissue imaging.
It typically uses light in the near-infrared spectral range which has a penetration depth of several hundred microns in tissue..
What wavelength does OCT use?
This technology uses longer wavelengths of 1050-1060 nm for deeper tissue penetration without the need for EDI.
This wavelength provides an axial resolution of about 5.3 um in tissue compared to the approximately 5 um axial resolution of the standard 800 nm wavelength of commercial spectral domain devices..
Why is infrared used in OCT?
3.2.
The back reflected waves are analyzed and their delay is measured to reveal the depth in which the reflection occurred.
OCT uses light in the near-infrared, which travels much faster than ultrasound.
The delays of the back-reflected waves cannot be measured directly, so a reference measurement is used..
The Light-CT Scanner is intended to acquire, store, retrieve, display, and transfer optical coherence tomography images of unsectioned excised surgical tissue for review by physicians to assist in forming a clinical judgment.
The Light-CT Scanner is not intended as a primary means of diagnosis.

Jul 15, 2021Abstract - In this paper we present a tomography system for transparent objects using visible light radiation sources.

Mar 15, 2021I developed a shadow-based CT scan technique (using visible light instead of X-ray) to
Duration: 1:48
Posted: Mar 15, 2021

Categories

Computed tomography visible light

What are the light sources in OCT?

What is the light source for OCT?

What type of light does a CT scan use?

What type of light does an OCT use?

What wavelength does OCT use?

Why is infrared used in OCT?