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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also body section roentgenography or sectional radiography), a technique of roentgenological study that is used to produce a photograph of a layer lying at a specific depth in the object under study.

Ordinary roentgenography results in the production on film of an overall image, from which it is not always possible to determine the true shape and size of a formation or the depth at which it lies. The production of a roentgenogram of a single layer is based on the movement of two of the three components (the X-ray tube, the X-ray film, and the object of study). In the most common technique, the patient is motionless, and the X-ray tube and film magazine move around him in opposite directions. The use of tomography makes possible the study of the trachea, the bronchi, and the blood vessels and the detection of infiltrates and cavities of the lungs, calculi in the kidney, gallbladder, and bile ducts, and tumors in the adrenals and urinary system. The combined use of X-ray contrast media and tomography (sectional bronchography, urography, and so on) is highly effective.


Gladysz, B. Tomografiia v klinicheskoi praktike. Warsaw, 1965. (Translated from Polish.)


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


An X-ray technique that shows a single plane (slice) of the object under examination, typically a part of the human body. See CAT scan.
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References in periodicals archive ?
A Comparison of Single Photon Emission Computed Tomography in Normal Controls, in Subjects with Multiple Chemical Sensitivity Syndrome and in Subjects with Chronic Fatigue Syndrome.
Beginning with the discovery of X-rays in 1895, he traces the history of imaging through today's computed tomography, MRI, positron emission tomography (PET), and single photon emission computed tomography (SPECT); considers key controversies such as radiation safety and protection, whole-body scanning for cancer detection, the contribution of these expensive technologies to the rising cost of health care in the US, the unequal distribution of facilities in developing countries, ethical questions, and the 2009 mammography guidelines controversy; and provides related primary source documents.
The addition of single photon emission computed tomography (SPECT) and computed tomography (CT) to a common nuclear medicine procedure improves sentinel lymph node detection in obese patients with breast cancer, according to a study from Israel.
(11) Single photon emission computed tomography (SPECT) has revealed cerebral perfusion deficits in CJD that may be used to differentiate it from other dementias, such as Alzheimer's disease.
It also picked up a repeat order for CZT detectors for a customer in the Single Photon Emission Computed Tomography (SPECT) market, and launched a new generation of CZT SPECT cameras that OEMs can configure into virtually any SPECT imaging system.
* Market size for Nuclear Imaging Equipment market categories - Positron Emission Tomography Systems (PET Systems and PET/CT Systems) and Single Photon Emission Computed Tomography Systems (SPECT Systems and SPECT/CT Systems)..
BC Technical services positron emission tomography (PET), PET/computed tomography (CT), single photon emission computed tomography (SPECT) and SPECT/CT technologies.Country: USASector: Electronics, HealthcareTarget: RA Services IncBuyer: BC Technical Inc Type: Corporate acquisitionStatus: Closed
Washington, Dec 12 (ANI): Oncologists have pointed out that integrating single photon emission computed tomography (SPECT) with the computerized tomography (CT) scans may offer breast cancer patients substantial protection against lymphedema.

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