tomography

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tomography

[tə′mäg·rə·fē]
(electronics)
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 It might be outdated or ideologically biased.

Tomography

 

(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.

REFERENCE

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

E. A. GRIGORIAN

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

tomography

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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Our analysis showed that DXA and QCT measurements were found to have an overall statistically significant difference (p < 0.001) on classifying a patient as osteoporotic, osteopenic, or normal.
The trabecular BMDs (mg/[cm.sup.3]) were measured by phantomless QCT technique.
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Table 2 shows the protective effects of QCT on MPLN-induced changes in plasma creatinine and urea in rats.
En este sentido, estos mismos autores exponen la estructura y las propiedades psicometricas del Cuestionario de Condiciones de Trabajo (qCT), disenado por ellos como herramienta para evaluar componentes centrales de la dimension psicosocial, percibida y subjetiva de las condiciones de trabajo en organizaciones de servicio a personas; "su contenido incluye aspectos de tales condiciones, que en funcion de su presencia e intensidad, pueden funcionar como factores protectores y promotores de salud, o por el contrario, como factores de riesgo psicosocial" (p.178).
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-- Len Lauer Promoted to COO and Steve Mollenkopf to President of QCT --