Related topics: radiation
Computed tomography
hideComputed tomography (CT) is a medical imaging method employing tomography. Digital geometry processing is used to generate a three-dimensional image of the inside of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. The word "tomography" is derived from the Greek tomos (slice) and graphein (to write). Computed tomography was originally known as the "EMI scan" as it was developed at a research branch of EMI, a company best known today for its music and recording business. It was later known as computed axial tomography (CAT or CT scan) and body section röntgenography.
CT produces a volume of data which can be manipulated, through a process known as "windowing", in order to demonstrate various bodily structures based on their ability to block the X-ray/Röntgen beam. Although historically the images generated were in the axial or transverse plane, orthogonal to the long axis of the body, modern scanners allow this volume of data to be reformatted in various planes or even as volumetric (3D) representations of structures. Although most common in medicine, CT is also used in other fields, such as nondestructive materials testing. Another example is the DigiMorph project at the University of Texas at Austin which uses a CT scanner to study biological and paleontological specimens.
For more information about Computed tomography, read the full article at
Wikipedia.
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News tagged with ct scan
Doctors' bedside skills trump medical technology
Medicine & Health / Neuroscience
Dec 18, 2009 |
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Sometimes, a simple bedside exam performed by a skilled physician is superior to a high-tech CT scan, a Loyola University Health System study has found.
New technology helps scientists understand ancient fossils
Other Sciences / Archaeology & Fossils
Dec 07, 2009 |
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Some of the world's oldest human bones and other ancient relics are studied here using some of the world's newest technologies.
Studies quantify radiation doses, cancer risks from CT scans
Dec 15, 2009 |
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Doses of radiation from commonly performed computed tomography (CT) scans vary widely, appear higher than generally believed and may contribute to an estimated tens of thousands of future cancer cases, according to two reports ...
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After foiled US plane attack, scanners revisited
19 hours ago |
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As US lawmakers demand to know how a would-be attacker smuggled explosives aboard a plane on Christmas Day, the use of body scanners at airport security points is likely to be revisited.
Better airport scanners delayed by privacy fears
Dec 28, 2009 |
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(AP) -- High-tech security scanners that might have prevented the Christmas Day attempt to blow up a jetliner have been installed in only a small number of airports around the world, in large part because ...
Researchers Create New Way To Locate Big Genetic Variants
Dec 28, 2009 |
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(PhysOrg.com) -- Yale University researchers, analyzing hundreds of billions of bits of genetic information, have collated and standardized 2,000 signposts that mark the boundaries of large blocks of human genomic variants.
Exposure to tobacco smoke in childhood home associated with early emphysema in adulthood
Dec 28, 2009 |
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Children regularly exposed to tobacco smoke at home were more likely to develop early emphysema in adulthood. This finding by researchers at Columbia University's Mailman School of Public Health suggests that the lungs may ...
Cassini Spacecraft to Monitor North Pole on Titan
Space & Earth / Space Exploration
Dec 28, 2009 |
4.6 / 5 (10) |
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(PhysOrg.com) -- Though there are no plans to investigate whether Saturn's moon Titan has a Santa Claus, NASA's Cassini will zoom close to Titan's north pole this weekend.
Genomic toggle switches divide autoimmune diseases into distinct clusters
Dec 23, 2009 |
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Genomic switches can predispose an individual to one set of autoimmune disorders but protect the same person against another set of them, scientists at Stanford University School of Medicine have found.
A novel gene found for childhood-onset asthma
Dec 23, 2009 |
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Pediatric researchers have identified a novel gene involved in childhood asthma, in one of the largest gene studies to date of the common respiratory disease. Because the gene, called DENND1B, affects cells and signaling ...
Use of 3-D imaging on patients with pancreatic carcinoma
Dec 22, 2009 |
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In the field of hepatic imaging in the context of living liver donors and before complex partial liver resections, three-dimensional imaging of the liver, hepatic vessels and bile ducts has managed to become established in ...
Physiologic factors linked to image quality of multidetector computed tomography scans
Dec 22, 2009 |
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A large multicenter international trial found that the image quality of multi-detector computed tomography (MDCT) scans, used for the noninvasive detection of coronary artery disease, can be significantly affected by patient ...
Enzyme necessary for development of healthy immune system
Dec 22, 2009 |
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Mice without the deoxycytidine kinase (dCK) enzyme have defects in their adaptive immune system, producing very low levels of both T and B lymphocytes, the major players involved in immune response, according to a study by ...
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