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Topic: Tomography

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	Tomography - Wikipedia, the free encyclopedia
		A device used in tomography is called a tomograph, while the image produced is a tomogram.
		For example, in conventional medical X-ray tomography, clinical staff make a sectional image through a body by moving an X-ray source and the film in opposite directions during the exposure.
		More modern variations of tomography involve gathering projection data from multiple directions and feeding the data into a tomographic reconstruction software algorithm processed by a computer.
	en.wikipedia.org /wiki/Tomography (437 words)

	Tomography - Seismology Research - KNMI
		Seismic tomography is a method to determine (to some level of accuracy) the internal structure (in terms of velocity) of the Earth.
		Local, regional and global tomography may differ in scale and approach but essentially refer to the same goal to image (part of) the interior of the Earth.
		Arrival time (or travel time) tomography is the technique to map the arrival time information in seismograms into a velocity model of the interior.
	www.knmi.nl /research/seismology/tomography.html (280 words)

	Seismic tomography applied to diamond pipes prospecting
		Seismic tomography may be applied to diamond kimberlite pipes prospecting using 2D and 3D seismic data.
		Transmission tomography is applicable for cross-hole data and is for use on detailed exploration stage (not considered).
		Refraction 2D and 3D prospecting and tomography is valuable when pipe is cut off with low velocity layer that is not covered with any high velocity one.
	www.webstructor.net /geotomo/paper_seg99/index.html (935 words)

	Electromagnetic Tomography
		As the measurements in electrical impedance tomography can be made rather fast, high processing speed of the facilities enables to visualize many processes (such as heart pulsation) in real time.
		According to the first clinical results, the new device is capable to diagnose number of pulmonary diseases including cancer, and therefore impedance tomography could substitute x-ray investigations in many cases as harmless and accessible method.
		V.A. Cherepenin and A.V. Korjenevsky, "Nonlinear impedance tomography", Proc.
	www.cplire.ru /html/cplitom.html (1409 words)

	Tomography (CAT, PET, MRI)
		Tomography is the technique of using ultrasound, gamma rays, or X-rays to obtaining a series of detailed pictures of areas inside the body (imaging); the pictures are created by a computer linked to the imaging machine.
		It is a diagnostic technique in which the combined use of a computer and X rays passed through the body at different angles produces clear cross-sectional images (slices) of the tissue being examined.
		PET (Positron Emission Tomography) -- It is a diagnostic technique based on the detection of coincidence events from electron-positron annihilation, which converts the masses to two 511 Kev X-rays moving in opposite directions (see Figure 3).
	universe-review.ca /R10-22-tomography.htm (835 words)

	ENHP - Programs of Study
		The computed tomography (CT) concentration courses offered at the University of Hartford serve to enhance the professional skills of individuals who are currently certified by the American Registry of Radiologic Technologists (ARRT) in radiography.
		The formation of the computed tomography image is discussed as well as the essential component parts of a CT imaging system.
		The University of Hartford's Computed Tomography concentration utilizes academic courses, laboratory experiences and clinical internships to provide each student with the cognitive, psychomotor and affective skills to perform acceptable computed tomography imaging examinations.
	www.hartford.edu /enhp/tomography.asp (618 words)

	Industrial Process Tomography at the University of Manchester
		Research in Industrial Process Tomography at Manchester has taken place since 1987 through the efforts of members of the School of Chemical Engineering and Analytical Science, the School of Electronic and Electrical Engineering and, more recently, the Schools of Mathematics and Mechanical Engineering.
		The ECT system is marketed by Manchester-based company, Process Tomography Ltd., and is the first commercial instrument of its kind in the world.
		A prototype microwave tomography system has been tested and further work on applications of this technology is currently being carried out.
	www.tomography.umist.ac.uk /intro.shtml (711 words)

	Process Tomography - Frequently Asked Questions
		Process tomography is based on taking a number of measurements of a process from a sensor and combining these to provide information on the distribution of material within the volume of the sensor.
		Resistance tomography systems for use in food and pharmaceutical environments are available and intrinsically safe systems will be available in 2002.
		Resistance tomography can be used in metal walled pipes and vessels in the presence of metal internals (such as down pipes and impeller shafts).
	www.itoms.com /faq.htm (462 words)

	Tomography overview
		High-resolution X-ray CT (Computed Tomography) is a completely nondestructive technique for visualizing features in the interior of opaque solid objects, and for obtaining digital information on their 3-D geometries and properties.
		Whereas volume CT has been largely perfected for some of the most advanced medical systems, and is ideally suited for tomography using parallel-beam synchrotron radiation, for industrial scanners it does not yet provide the same quality of imagery as single-slice arrangements.
		Although the output of computed tomography is visual in nature and thus lends itself to straightforward interpretation, subtle complications can render the data more problematic for quantitative use.
	www.ctlab.geo.utexas.edu /overview/index.html (7020 words)

	Positron emission tomography Summary
		Positron emission tomography (PET) is a scanning technique used in conjunction with small amounts of radiolabeled compounds to visualize brain anatomy and function.
		This single photon emission computerized tomography (SPECT) has several drawbacks, as many of the photons either emitted are missed by the detectors or located only within a cone roughly centered around the location of their creation.
		However, while other imaging scans such as CT and MRI, isolate organic anatomic changes in the body, PET scanners are capable of detecting areas of molecular biology detail (even prior to anatomic change) via the use of radiolabelled molecular probes that have different rates of uptake depending on the type of tissue involved.
	www.bookrags.com /Positron_emission_tomography (2823 words)

	Industrial Process Tomography at the University of Manchester
		Research in Industrial Process Tomography at the University of Manchester has taken place in Manchester since 1987 and spans the schools of Electrical Engineering and Electronics, Chemical Engineering and Analytical Science, Mathematics and Mechanical Engineering.
		This relatively new technology is progressing from early foundations in low-frequency electrical tomography to include microwave and optoelectronic techniques.
		We are world leaders in Electrical tomography instrumentation and this has spawned commercial instruments from Industrial Tomography Ltd. and Process Tomopgraphy Ltd. A £3M Foresight Challenge grant and a £2.2M EPSRC Platform grant were awarded in 1996 and 2001 respectively.
	www.tomography.umist.ac.uk (199 words)

	Positron Emission Tomography
		Positron emission tomography (PET) is a test that uses a special type of camera and a special test medicine (radioactive tracer) to look at organs in the body.
		A positron emission tomography (PET) scan is done in a hospital nuclear medicine department or at a special PET center by a radiologist or nuclear medicine specialist and a nuclear medicine technologist.
		Positron emission tomography (PET) is a test that uses tomography and a special test medicine (radioactive tracer) to look at organs in the body.
	www.webmd.com /hw/health_guide_atoz/aa80345.asp (1381 words)

	SLU Geosciences - Seismic Tomography Seminar
		The number of papers on tomography is substantial and we cannot discuss them all, but we'll try to sample a broad cross section of published material.
		Objectives: To wade deeper into the mathematics of tomography which is common to all imaging problems and many other inverse problems in the geosciences.
		Construct a one-dimensional tomography problem with five cells and four observations (and ray paths).
	eqseis.geosc.psu.edu /~cammon/HTML/Classes/TomoSem/TomoSem.html (1499 words)

	Computer Imaging / Tomography
		X-ray computed tomography (to-MOG'rah-fe), including conventional, helical and electron-beam ("Ultrafast®") forms, provides cross-sectional images of the chest, including the heart and great vessels.
		In general, cardiac tomography (also called CT scan and coronary artery scanning) is useful to evaluate aortic disease (such as aortic dissection), cardiac masses and pericardial (pair"e-KAR'de-al) disease.
		Positron emission tomography (to-MOG'rah-fe) of the heart allows the study and quantification of various aspects of heart tissue function.
	www.americanheart.org /presenter.jhtml?identifier=4554 (1249 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		Positron emission tomography (PET) is a specialized radiology procedure used to examine various body tissues to identify certain conditions.
		Specifically, PET studies evaluate the metabolism of a particular organ or tissue, so that information about the physiology (functionality) and anatomy (structure) of the organ or tissue is evaluated, as well as its biochemical properties.
		PET is most often used by oncologists (physicians specializing in cancer treatment), neurologists and neurosurgeons (physicians specializing in treatment and surgery of the brain and nervous system), and cardiologists (physicians specializing in the treatment of the heart).
	www.ecommunity.com /cancercare/index.asp?pageid=P07654 (1919 words)

	Computed Tomography (CT): Questions and Answers - National Cancer Institute
		Computed tomography (CT) is a diagnostic procedure that uses special x-ray equipment to obtain cross-sectional pictures of the body (see Question 1).
		Computed tomography (CT) is a diagnostic procedure that uses special x-ray equipment to obtain cross-sectional pictures of the body.
		One type of virtual endoscopy, known as CT colonography or virtual colonoscopy, is under study as a screening technique for colon cancer.
	www.cancer.gov /cancertopics/factsheet/Detection/CT (1043 words)

	Screening for cancer with computed tomography -- Swensen 326 (7395): 894 -- BMJ
		Whole body screening with computed tomography is the focus of a major advertising campaign in the United States.
		Whole body screening with computed tomography engages the same issues on a larger scale.
		Lung cancer screening with helical computed tomography in older adult smokers: a decision and cost-effectiveness analysis.
	www.bmj.com /cgi/content/full/326/7395/894 (1156 words)

	Positron emission tomography (PET) scan - MayoClinic.com (Site not responding. Last check: 2007-10-13)
		A positron emission tomography (PET) scan is an imaging test that can detect changes within certain tissues or organs early, often before disease progresses.
		A positron emission tomography (PET) scan is a specific type of imaging test that can help your doctor see how the tissues and organs inside your body are functioning.
		Although a radioactive substance is used during a PET scan, the amount of radiation that you're exposed to is low.
	www.mayoclinic.com /health/pet-scan/CA00052 (1877 words)

	Photonics
		Optical tomography, is centred around the simple idea that light passes through the body in small amounts, and emerges bearing clues about tissues through which it has passed.
		Getting near-infrared optical tomography to work, is a big challenge, for the associated mathematical problem is by its nature very difficult to model accurately.
		It has been shown, however, to be inaccurate in many instances, particularly for applications that involve structures near the surface, or situations with fluids and vessels and at any sharp discontinuity of scattering property.
	www.imperial.ac.uk /research/photonics/research/topics/tomog/tomog.htm (1611 words)

	Radiology - Computed Tomography (CT or CAT) Scan
		In computed tomography, the x-ray beam moves in a circle around the body.
		This type of CT scan uses very thin slices (less than one-tenth of an inch), which are effective in providing greater detail in certain conditions such as lung disease.
		This type of CT scan produces images very rapidly, thus creating a type of "movie" of moving parts of the body, such as the chambers and valves of the heart.
	stjohns.com /greystone/adult/radiology/ct.aspx (906 words)

	Process Tomography Limited
		We specialise in the design and manufacture of a wide range of products for measuring very small values of electrical capacitance These include Electrical Capacitance Tomography (ECT) systems, which allow the concentration distribution of dielectric materials (oils, plastics, minerals etc.) inside closed vessels to be viewed, measured and captured at high frame rates.
		For information about ECT and Process Tomography, please read About ECT and for information about our full range of measurement hardware and software, click here.
		We have also included a set of links to a number of related tomography research organisations here.
	www.tomography.com (407 words)

	Computed Tomography to Detect Coronary Artery Calcification
		This policy addresses the use of electron beam computed tomography (EBCT) for two main indications, namely, as a screening technique for coronary artery disease (CAD) in asymptomatic individuals or for evaluating the necessity of angiography in symptomatic patients.
		Computed tomography, heart, without contrast material followed by contrast material(s) and further sections, including cardiac gating and 3D image post processing; cardiac structure and morphology, with quantitative evaluation of coronary calcium
		Computed tomography, heart, without contrast material followed by contrast material(s) and further sections, including cardiac gating and 3D image post processing; cardiac structure and morphology and computed tomographic angiography of coronary arteries (including native and anomalous coronary arteries, coronary bypass grafts), with quantitative evaluation of coronary calcium
	www.regence.com /trgmedpol/radiology/rad06.html (1987 words)

	Computed Tomography for Pulmonary Indications
		More recently, there has been interest in computed tomography (CT) scanning as a screening technique, using either spiral (also referred to as helical) or electron beam (also referred to as ultrafast) CT scanning.
		Low dose spiral computed tomography screening for lung cancer: not ready for prime time.
		Spiral computed tomography screening for lung cancer is ready for prime time.
	www.regence.com /trgmedpol/radiology/rad32.html (2777 words)

	Gatan, Inc: Software, Tomography (Site not responding. Last check: 2007-10-13)
		This new 3D tomography software works with Gatan’s complete line of room-temperature and cryo-transfer Tomography Holders and Gatan Imaging Filters or digital TEM cameras on most TEMs (with computer controlled sample stages, illumination and imaging systems).
		The Gatan Tomography software allows you to acquire a tilt series while correcting for specimen drift and any mechanical instabilities of the goniometer.
		The tomography series can be collected with live tracking or using a pre-acquired stage calibration.
	www.gatan.com /imaging/tomography.html (273 words)

	Harmen Bijwaard's global seismic tomography page
		In short: seismic tomography is a technique to image the interior of the Earth with (pressure) waves that are generated by earthquakes.
		The method is comparable to that of the CT scan that is used to image the interior of the human body.
		In 1999 I completed a PhD thesis on global seismic tomography at the Faculty of Earth Sciences of Utrecht University.
	www.geo.uu.nl /~bijwaard (856 words)

	CTSim: The Computed Tomography Simulator (Site not responding. Last check: 2007-10-13)
		Computed Tomography is the technique of estimating the interior of objects from the measurements of radiation projected through the object.
		That radiation can be transmitted through the object such as in X-ray computed tomography or emitted from internal radiation sources as in nuclear medicine scans.
		Computed Tomography is an extremely imporant imaging technique in modern medicine.
	www.ctsim.org (501 words)

	Computed tomography - Wikipedia, the free encyclopedia
		The word "tomography" is derived from the Greek tomos (slice) and graphia (to write).
		CT produces a volume of data which can be manipulated, through a process known as windowing, in order to demonstrate various structures based on their ability to block the X-ray beam.
		In conventional CT machines, an X-ray tube and detector are physically rotated behind a circular shroud (see the image above right); in the electron beam tomography (EBT) the tube is far larger and higher power to support the high temporal resolution.
	en.wikipedia.org /wiki/Computed_axial_tomography (3369 words)

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