Tomography

tomography
The scheme tomographic research of the chest: 1 - x-ray tube; 2 - cassette.

Tomography (synonym layer-by-layer x-ray examination) is the method of roentgenologic examination, allowing to get x-rays of the individual layers of the study area. The imaging is done with the help of a special apparatus - tomography or CT of the console, which is given a modern x-ray installations. To obtain tomograms are moved in opposite directions x-ray tube and the tape with x-ray film (Fig.), United rigid system. In connection with the movement of x-ray tube most details, reflecting the study area, become fuzzy, as if smeared out, and only the details in the plane of the axis of motion of the tube and cassette, clearly visible. Changing level of an axis of motion, you can make x-ray images of various strata. Depending on the purpose of the study layered images produced through 2; 1; 0,5 see Tomography do in different projections: the frontal, side, oblique, axial (with the help of a special, so-called cross, scanner).
Tomography significantly complements the results of conventional radiography, allowing to reveal important details, which are not reflected in the x-ray because of the summary display on the plane shot the entire thickness of the study area.
MRI is often used to identify infiltrates, cavitation, abscesses, lesions in the lungs, enlarged lymph nodes in the mediastinum and other pathological changes in the organs of the chest and destructive lesions in the bones. Substantial assistance tomography has in the diagnosis of diseases of the larynx, sinus, bones and joints (especially skull and spine).
The combination of imaging with other methods, for example by pneumomediastinum (see), urography (see), angiography (see), significantly improves the diagnostic value of radiological examination.
Cm. also Tamiflurare.