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Biomedical subjects

R V Katomina

Publications and source records attributed to R V Katomina.

12 recordsLinked to original sources
PubMedDate not supplied

[Sensitometric characteristics of medical roentgenographic and fluorographic films. Sensitivity of the amplifying screens combined with a film].

Factors affecting the degree of sensitivity of roentgenographic and radiofluorographic films and of their combinations with fluorescent screens are considered. A method of films exposure with a roentgenosensitometer permitting it to determine the sensitivity in conditions closely approaching the ones used in practice and corresponding to the minimum of the isoopaque is suggested. A way for determining the sensitivity of films in m2-mJ1 and lx-1-c-1 is indicated. Numerical values for the sensitivity of the films and their combinations with the screens are given. It is shown that with Eef = 38 keV, T = 20 degrees C, exposure time of 0.4--1 sec and optical density 1.00 over general focusing the lower limit of the X-ray RM-1film sensitivity to the light of CaWO4-screens is 38 m2-mJ-1 and of the fluorographic film Pphi-3 to the light of the Zn0-68Cd0-32S--Ag-screens -- 14.6 m2-mJ-1 or 30 lx-1-c-1.

Fluoroscopy↗
PubMedDate not supplied

[Basic parameters and testing methods for medical roentgen screens].

The basic parameters characterizing the optical properties of the roentgen screens of all types included in the CMEA Standards and GOSTs have been considered. The classification of screens is given. The measurement principles for the absolute and relative characteristics of their effectiveness are described. The properties of the screens determining their effect on the image quality such as the definition of the picture, the graininess and the minimal size of observed details have been considered. The methods of controlling the persistence of the screens and the presence of radionuclide tracks have been described.

Radiographic Image Enhancement↗
PubMedDate not supplied

[Dependence of the sensitivity of combined intensifying film-screens on the voltage in X-ray tubes].

The computed and experimental dependencies of the luminescence intensity of intensifying screens, their gain and the sensitivity of the screen-film combinations versus the X-ray tube voltage age compared. The computed data are in good agreement with the experimental results. The data make it possible to account for the hardness in the plots of efficiency for various intensifying screens, when roentgenograms are produced under manual and automated control.

Electronic Data Processing↗