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(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.)



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.
References in periodicals archive ?
Computed tomographic coronary angiography (CTCA) is a rapidly evolving noninvasive modality for doing coronary angiography that has been shown to have acceptable sensitivity and specificity (3).
All radiologists reported significantly greater confidence in their ability to make these predictions with the tomographic images.
A computed tomographic (CT) scan of the chest confirmed the presence of a 5 x 10 x 8-cm left posterolateral pericardial fluid collection.
Transverse length scales based on atomic force microscopy, scanning electron microscopy, x-ray transmission and tomographic reconstruction agreed to within 10 nm.
A convention highlight was the presentation of the Yves Rocard Prize to Groupe de Physique des Matriaux (GPM) of Rouen University and Cameca for their joint development of the Tomographic Atom Probe (TAP).
Computerized tomographic and ultrasonographic features of Kimura's disease, J Laryngol Otol 1997;lll:389-91.
The correspondence is striking, he says, because there has been little agreement in the past between tomographic studies relying on S-waves and those using P-waves.
He covers classical linear systems theory and its applications to biomedicine; the use of joint time-frequency analysis to characterize nonstationary physiological signals; the mathematics of tomographic imaging; noise and linear and nonlinear systems; the application of statistics to genomic systems; and the analytical signal and the Hilbert transform and its biomedical applications.
The patients underwent cardiovascular imaging tests, including single photon emission computed tomography, positron emission tomography, and coronary computed tomographic angiography.
HEAVY BREATHING: Computerised tomographic (CT) X-ray images of an American alligator
The patient was initially unwilling to undergo invasive coronary angiography but was amenable to noninvasive, coronary computed tomographic angiography (CCTA).