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.
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 ...
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.
Study: CT scans rule out heart attacks faster
Nov 18, 2009 |
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(AP) -- A new study suggests that a type of "super X-ray" can give a faster, cheaper way to tell whether a chest pain sufferer is really having a heart attack.
CT scans better than X-rays when detecting abnormalities in patients with H1N1 virus
Oct 21, 2009 |
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Computed tomography (CT) scans are better than standard radiography (X-rays) in showing the extent of disease in patients with the H1N1 virus, according to a study to be published online Oct. 21, 2009, in the American Jo ...
Study identifies which children do not need CT scans after head trauma
Sep 15, 2009 |
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A substantial percentage of children who get CT scans after apparently minor head trauma do not need them, and as a result are put at increased risk of cancer due to radiation exposure. After analyzing more than 42,000 children ...
PET/CT scans may help detect recurring prostate cancer earlier
Sep 01, 2009 |
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A new study published in the September issue of The Journal of Nuclear Medicine shows that positron emission tomography (PET)/computer tomography (CT) scans with the imaging agent choline could detect recurring prostate cancer ...
Study fuels debate over routine medical tests
Aug 27, 2009 |
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A new study found a small but significant number of patients received dangerously high doses of radiation from medical imaging tests, putting them at higher risk for cancer -- sometimes needlessly.
Low-dose CT method, delivering 50 percent less radiation, correctly identifies patients with appendicitis
Jul 22, 2009 |
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Patients with possible appendicitis are typically evaluated using a standard-dose contrast enhanced CT, but a low-dose unenhanced CT that delivers approximately 50% less radiation is just as effective, according to a study ...
Cold case techniques bring mummy's face to life
Other Sciences / Archaeology & Fossils
Jun 22, 2009 |
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(PhysOrg.com) -- Thanks to the skills of artists who work on cold case investigations, people have a chance to see what the Oriental Institute’s mummy Meresamun may have looked like in real life.
Rare prehistoric pregnant turtle found in Utah
Other Sciences / Archaeology & Fossils
May 08, 2009 |
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(AP) -- Paleontologists say a 75-million-year-old turtle fossil uncovered in southern Utah has a clutch of eggs inside, making it the first prehistoric pregnant turtle found in the United States.
From cars to cancer: Researcher employs auto industry tools for tumor therapy
May 06, 2009 |
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An effort is under way at the University of Houston to use technologies with origins in the automobile industry to develop new tools that will help doctors and technicians better plan radiation therapy for ...
CT scans increase cancer risk estimates in multiply-imaged emergency department patients
May 05, 2009 |
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Physicians should review a patient's CT imaging history and cumulative radiation dose when considering whether to perform another CT exam, according to researchers at Brigham and Women's Hospital, Boston, MA, and Washington ...
Type of lung cancer screening used to detect disease may impact 5-year survival rates
May 04, 2009 |
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Dr. Hisao Asamura and his team of researchers at The National Cancer Center Hospital in Tokyo, Japan examined the records of 2,281 patients who underwent lung cancer resection surgery between 2000 and 2006. The study was ...
CT scans: Too much of a good thing can be risky
Mar 31, 2009 |
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Patients who undergo numerous CT scans over their lifetime may be at increased risk for cancer, according to a study published in the April issue of Radiology.
