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Virtual Dictionary

Optical Tomography

Optical tomography is a form of sectional imaging in which a volumetric model is created in three-dimensional space from reconstructed light scattering through a physical object. Optical tomography can only be used on partially translucent objects so that some of the light passes straight through and the rest is scattered in diffuse directions. As such, it is primarily used as medical imaging, since flesh meets these parameters ideally.

CT scanning is almost always optical tomography, and the result is a voxel-based model that can be directly manipulated as a particle swarm in any compatible VR interface. Typically the imaging uses infrared light to take best advantage of the increased transparency of soft tissue at those wavelengths. However, optical tomography is often severely adversely affected by motion in the scanned object such as sudden movement, and even deep breathing, so additional methods must be used to clean the image up, for further working.

See Also: CT, Diffuse Interreflection, Voxel, Volumetric Model, Voxel-Based Morphometry

Below, we offer a selection of links from our resource databases which may match this term.



Related Dictionary Entries for Optical Tomography:

Computed Tomography

CT

Interferometric Synthetic Aperture Microscopy

ISAM

Optical Tomography

Real Time Radiography

RTR

Tomography









 

Resources in our database matching the Term Optical Tomography:

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Locally Hosted resource
Automated Calibration Method Developed for Optical Microscopes - and HMDs
Industry News

An automated calibration method, designed for optical microscopes, may find a home in head mounted display units and heads-up augmented reality systems.



Locally Hosted resource
Fast Adaptive Optics for 3D Medical Imaging
One of the greatest problems with tomography based medical scanners, is what happens when the patient moves (breathes, or pumps blood). The distortion that occurs in each slice has long been correctable, but takes a long time to correct. With near-instant correction now possible, real-time medical scanning is starting to look like a true possibility.



Locally Hosted resource
Optogenetics and Neuroprosthetics Combine
Optogenetics as a field of study, is only a few years old but already a means has been found to make use of it in living brains. Light-detecting proteins combined with gene therapy and an optical neuroprosthetic with a BrainGate style 3D array allow true two-way communication between the brain and a computer system.



Locally Hosted resource
Large Image Display: Chrysalis: Optical Door Locks
This still from Chrysalis shows a very different method of locking and unlocking your front door than we are used to. There is no key and no key hole. Instead, what there is is a retinal scanner embedded in the door level with the average head. Peer in and if it recognises you, it unlocks. If not, there is nothing to pick.



Locally Hosted resource
Optical Tracking of Zebrafish Neural Impulses
Zebrafish are handy little critters, as far as neuroscience goes. These tiny, mostly transparent little fish have brains that whilst greatly simplified, have a structure remarkably similar in basic form, to our own. Add in that aforementioned near-transparency, and it becomes possible under the correct lighting conditions, to literally see right into their brains, to the point where you can practically watch as a thought takes place.




Virtual sight devices, sometimes termed virtual light, are a class of display system which is a mix of AR, prosthetics, and VR. They have no actual display units as such, and completely bypass the human eye. Instead, they tap into the optical nerve directly, and deliver processed information to the neurons heading into the brain.




Locally Hosted resource
Optical Machine Vision Navigation System Found in Flies
A study conducted to understand how flies and bees can navigate so precisely using just natural sunlight, has interesting implications for machine vision, and adding additional sense-based navigation systems to UAVs and UGVs without adding the weight or cost of any extra hardware.



 

Industry News containing the Term Optical Tomography:

Results by page

(24/04/2012)
Real-time, 3-D microscopic tissue imaging could be a revolution for medical fields such as cancer diagnosis, minimally invasive surgery and ophthalmology. University of Illinois researchers have developed a technique to computationally corr...


(03/12/2009)
As technology shrinks ever smaller, interest in objects and devices on the nanoscale becomes more apparent. However, visualizing these objects in three dimensions comes with special challenges. Alexander Govyadinov, a scientist at the Unive...


(29/09/2007)
Using optical projection tomography (OPT), researchers have produced 3-D images of fruit-fly brains in various stages of degeneration. The hope of doing this is using the imagery, mapped to the areas of fruitfly brains in all three dimensio...


(20/07/2007)
Like an elderly person climbing a long flight of stairs, optical computing has been coming up for a while now. This month, we are another step closer, with the creation of a light-based transistor made of semiconducting nanowires.
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(28/09/2009)
Researchers at Cornell University have developed a simple silicon device for speeding up optical data. The device incorporates a silicon chip called a "time lens," lengths of optical fiber, and a laser. It splits up a data stream encoded ...