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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 It might be outdated or ideologically biased.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 ?
But it still feels like just the beginning DUCHESS OF SUSSEX ON QCT WOMEN'S PANEL
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.
The specimens were thawed to the room temperature only before compressive mechanical test to minimize the effect on the mechanical properties of the bone, and both QCT scanning and mechanical testing were conducted within 8 h with no refreezing [11].
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).
Unlike dual-energy x-ray absorptiometry (DXA) screening or QCT assessment, "the method that we used requires a negligible amount of training and time; could be applied prospectively by the interpreting radiologist or retrospectively by a radiologist or even nonradiologist; adds no cost; and requires no additional patient time, equipment, software, or radiation exposure," the investigators wrote.
Mahmud Abbas, director, QC office in Kosovo, said that the QCT project has an important role in education and development in the Kosovo community and an integral part of the care for the needy, in particular the orphans.
Quantitative computed tomography (QCT) or a lateral projection of the lumbar spine by DEXA reflecting more accurate results than posteroanterior lumbar DEXA in determining the bone mass in AS has been suggested (5, 26).
-- Len Lauer Promoted to COO and Steve Mollenkopf to President of QCT --