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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 It might be outdated or ideologically biased.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 ?
Then one should move to stage II of the investigations, using the ultrasonic tomography method to confirm the defects detected by the impulse response method and to locate them along the depth of the tested member.
The tests were carried out in accordance with the methodology described in Section 4, using first the impulse response method and then the ultrasonic tomography method.
Then, in accordance with the proposed methodology, tests were carried out using the nondestructive ultrasonic tomography method.
The results obtained using the ultrasonic tomography method confirmed the results, which had been obtained by the impulse response method.
Taking the above observations (supported by the author's experience in this field) into consideration, this paper presents a methodology for the non-destructive identification of the thickness of unilaterally accessible concrete elements through the comprehensive use of ultrasonic tomography and the impact-echo technique.
The proposed methodology for the non-destructive identification of the thickness of unilaterally accessible concrete elements, using the non-destructive acoustic techniques of ultrasonic tomography and impact-echo in a comprehensive way, is shown graphically in Figures 4 and 5 and described below.
In stage 1, tests using the ultrasonic tomography technique should be carried out.
The test results obtained using the ultrasonic tomography and impact-echo techniques showed the thickness of the concrete tunnel shell was not uniform, ranging from 389 to 416 mm, as shown in Figure 14.