Recording devices for coronary arteriography
The x-ray absorption patterns generated during coronary arteriography may be detected by full-size radiographic intensifying screens, which produce a light image corresponding to the absorption pattern of the modulated x-ray beam. The light image creates a latent image in the silver halide emulsion of full-size films, which are serially brought into close contact with the screens. This process, serial radiography, produces serially exposed, full-size radiographs.
X-ray absorption patterns may also be detected by the electron-optical x-ray image intensifier, which produces at its output screen a light image of relatively high intensity that, except for its reduced size, corresponds to the absorption pattern of the modulated beam. Image intensifier fluorography, the photographic recording of the light image appearing at the output screen, may be carried out by several methods: single exposure fluorography, a method of producing individual fluorographic records; serial fluorography, a method of producing fluorographic records at predetermined intervals and not intended for cine projection; and cinefluorography, a method of fluorographic recording at regular intervals intended for cine projection.
During the past 10 years it has become increasingly common to extend the definition of image intensifier fluorography to include video-fluorography, a method of producing recording via the television chain which, optically coupled to the output screen, was formerly employed only for fluoroscopy.
The advantage of serial radiography is the production of full-size radiographs that provide maximum resolution of vascular structures and can be conveniently handled and viewed. This process has two important disadvantages. First, it cannot provide dynamic information, e.g., . . .