Single Photon Emission Computed Tomography

Single photon emission computed tomography or SPECT, occasionally referred to as SPET, is a method of 3D data collection for living organic bodies. Essentially, it slices the body into tens of thousands of slides using gamma rays. These can then be stacked together to create a 3D rendition.

The gamma irradiator is run down the body from multiple angles such that each slice of the body is captured from multiple vantage points, typically only a few degrees apart.

SPECT is frequently used as a brain structure imager, and as a general body diagnostic imager.

See Also: PET, fMRI, MRI

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

Single Photon Emission Computed Tomography

SPECT

SPET

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Ultrasensitive Imaging: Hunting Every Photon
As the demands for precise imaging in fields such as medicine, astronomy, and real-time machine vision in hostile environments continue to increase, so the demands placed on imaging equipment become ever more stringent. An imaging method based on Single Photon Avalanche Photodiodes (SPAD) offers the potential to ease this bottleneck greatly.

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.

VR Interfaces: Toshiba?s Aquilion ONE CT System

Toshiba's leviathan of a computed topography scanner, Aquilion ONE is an attempt to go beyond the need for multiple scanning tests. The plan is to replace x-rays, CAT scans, nuclear studies, and other visualisation based diagnosis techniques in one swoop.

Virtual Colonography vs. Standard Colonoscopy
Virtual colonography is a relatively new field, which is completely non-invasive. A computed Topography (CT) scan is taken, where the body is invasively scanned into slices, which are then reconstituted into a 3D model of a person's colon, for a painless colonoscopy.

The Brain Knows What the Nose Smells, but How?
The sense of smell is a strange one, and its ties with memory even stranger. How does a single sniff of a scent alert even the tiniest animal immediately to which predator is nearby? How does a human know with a single whiff of an ardour, precisely what to expect when they walk into the next room?

True 3D Endoscopy
Whilst endoscopes and laproscopic surgery are truly a revolutionary way of peering inside the body and performing complex operations from tiny incisions, the size of the endoscope has always traditionally limited them to single cameras and flat displays. But, with a little lateral thinking, even a single camera can produce stereoscopy.

Meshworm: A robot made of a single Artificial Muscle
Meshworm is the prototype proof of concept for a new type of artificial muscle, based on an in-depth study of the movement patterns of the common earthworm, and shows how it is possible to create a 'soft' robot or prosthetic that is basically a single muscle and very little else.

3-D Modeling Advance: A single photo can be reconstructed into a 3-D scene
Building on the premise of Parallax mapping, in which 3D displacement of surfaces is faked by means of displacing textures both by creating a height map of their protuberance from 3D space and then calculating the angle of that protuberance relative to the angle the observer is looking, Microsoft and Make3D have created a process allowing a single photo to become a 3D scene.

Large Image Display: University of Washington: Astrobiology Graduate Student Conference 2009 - image 1
The above image from a mixed reality conference ? split between a physical location and a single virtual world ? illustrates yet again the problem with packing a large number of avatars into a single, small virtual space, under current technological approaches.

VR Interfaces: Scent Wave

Scent Wave is a single-scent dispenser, each unit holding and dispensing a single scent-stick. Using a dry-air technology that releases fragrance without sprays, aerosols or heated oils, Scent Wave is one of those systems that will work after being bunged in a cupboard for six months. Used primarily in retail environments, this system often finds use in large-scale VR such as military simulations and immersive training.

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