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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 It might be outdated or ideologically biased.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 ?
van Kaam, "Unilateral atelectasis in a preterm infant monitored with electrical impedance tomography: a case report," European Journal of Pediatrics, vol.
Detection of 'best' positive end-expiratory pressure derived from electrical impedance tomography parameters during a decremental positive end-expiratory pressure trial.
[20] Brown B H Electrical impedance tomography (EIT): a review J.
Dickin, "Improved modified Newton-Raphson algorithm for electrical impedance tomography," Electronics Letters, vol.
Su, "Boundary image reconstruction based on the nonmonotonic and self-adaptive trust region method for electrical impedance tomography," Physiological Measurement, Vol.
ADC: Analogue-to-digital converter; DFT: Discrete Fourier Transform;DTFT: Discrete-time Fourier Transform; DSP: Digital signal processor;dsp: Digital signal processing;EIT: Electrical impedance tomography;fEITER: Functional Electrical Impedance Tomography ofEvoked Responses;FPGA: Field Programmable Gate Array; MSB: Most significant bitPSD: Phase-sensitive detection; SNR: Signal-to-noise ratio;SQNR: Signal to quantization noise ratio;VHDL: VHSIC Hardware Description Language.
The method of symmetrical electrical impedance tomography (SEIT) reconstructs the images of stroke lesions primarily based on the stroke-induced electrical impedance asymmetry in human heads; therefore, the greater the asymmetry is, the easier the lesion could be detected.
Holder, Electrical Impedance Tomography: Methods, History, and Applications, IOP Publishing, 2005.
is fundamental for understanding its inverse problem, commonly known as electrical impedance tomography, first correctly posed in mathematical form by Calderon [1] in 1980.
Kim, "An experimental study of electrical impedance tomography for the two-phase flow visualization," International Communications in Heat and Mass Transfer, Vol.
Lionheart, "Temporal image reconstruction in electrical impedance tomography," Physiol.

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