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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
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 ...
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.
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Repeat negative CT scan for lung cancer does not encourage ex-smokers to resume the habit
Dec 04, 2009 |
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Assurance of a cancer-free status did not prompt people participating in a long-term computerized tomography (CT) lung-cancer screening program to pick up their cigarettes again, researchers wrote in a study published in ...
CT: The first-line imaging choice of physicians for the diagnosis of pulmonary embolism
Dec 22, 2009 |
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Computed tomography (CT), a highly accurate, readily available medical imaging technique, is the overwhelmingly preferred technique of emergency physicians and radiologists for the diagnosis of pulmonary embolism (PE), according ...
Researchers identify possible imaging method to stratify breast cancer without biopsy
Dec 17, 2009 |
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Scientists from the Kimmel Cancer Center at Jefferson have discovered a possible way for malignant breast tumors to be identified, without the need for a biopsy. The findings were published online ahead of print in the Journal of ...
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 ...
Clearing the way for detecting pulmonary embolism
Dec 01, 2009 |
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When it comes to diagnosing pulmonary embolism—a sudden blockage in the lung artery that could be deadly if not treated—which technique is the most effective? Research published in the December issue of The Journal of Nu ...
Unindicated CT series result in unnecessary radiation exposure for patients
Nov 30, 2009 |
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A large proportion of patients who undergo abdominal/pelvic computed tomography (CT) receive unindicated and unnecessary additional image acquisition resulting in excess, avoidable radiation exposure, according to a study ...
Researchers reveal ancient origins of modern opossum
Other Sciences / Archaeology & Fossils
Dec 16, 2009 |
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A University of Florida researcher has co-authored a study tracing the evolution of the modern opossum back to the extinction of the dinosaurs and finding evidence to support North America as the center of ...
On-call radiology residents accurately interpret off-hours neuro CT exams
Nov 25, 2009 |
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On-call radiology residents generally provide accurate preliminary interpretation of emergency neuroradiology CT scans after hours when attending neuroradiologist unavailable, according to results of a large study performed ...
FDA researchers identify new MRI safety risk for patients with pacemakers
Dec 15, 2009 |
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FDA researchers have found that certain cardiac pacemakers may inadequately stimulate a patient's heart while undergoing a magnetic resonance imaging (MRI) scan due to the magnetic pulses mixing with the electronic pulses ...
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 ...
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