Rentgenonegativee is an x - ray method of research, which allows to get a picture of the various bodies in the dynamics thanks to the use of video cameras. The use of film in the x-rays became possible after the introduction of the in medical practice of electron-optical systems, the so-called image intensifier (see Electronic-optical amplifier). Image intensifier can increase the brightness of the image in comparison with the image on the x screen 1,000 times, with the final image corresponds to a field survey in diameter 13 cm and more. Using the optical system allows users to capture rentgenokhirurgicheskogo movie on film of a width of 16 mm, the screen turns bright enough to play it on film. Shooting rentgenokhirurgicheskogo movie using image intensifier requires technical conditions of the order of 90 sq. and 3 mA, so that the average irradiation dose does not exceed that which gets sick when kymography.
Because modern equipment allows us to obtain an image of a small field, for shooting a large organs and systems use the pan, i.e., consecutive shooting separate parts of the organ or system. As the shooting itself and the projection of the film may be produced with different frame rate, allowing more detail to follow the function of the examined organ. If necessary, you can stop the projector and to consider on the screen static image as a normal radiograph.
A relatively small dose of x-ray exposure while using image intensifier allow to make a film for 6 minutes without harm to the patient.
Rentgenonegativee, unlike conventional radiography, opens up great possibilities in diagnostics of organic and functional diseases. Rentgenonegativee has found application in various fields of radiology, especially in the study of the cardiovascular system, gastrointestinal tract, urinary system. Rentgenonegativee allows not only to diagnose various functional disorders, but also to study normal physiology. For example, rentgenonegativee made it possible to definitively confirm ristodog theory of the dynamics of the upper urinary tract. Advantages rentgenonegativee before other x-ray examination methods are visual representations of functional activity of organs and systems in the possibility of multiple demonstrations of received films.