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Biomedical subjects

F G Gorelik

Publications and source records attributed to F G Gorelik.

At least 19 recordsLinked to original sources
PubMed1992

Luminescent screens for general X-ray diagnostics.

This article gives the main parameters of amplifying screens manufactured in the USSR: the sensitivity, the resolution, the modulation depth, the noise. The technical level of Soviet screens is compared with the level of those manufactured by certain foreign companies. The measures taken to increase the technical level of today's products and the further evolution directions are discussed. Data are given on screen production in the USSR during the last 5 years and their supposed production up to 2000.

Evaluation Studies as Topic↗
PubMedDate not supplied

[Frequency-contrast characteristics of an x-ray image intensifier].

To analyze intricate roentgeno-diagnostic complexes the need for application of frequency-contrast characteristics (FCC) is generally acknowledged at present. The paper presents a description of procedures used in an experimental definition and analysis of three-dimensional characteristics of roentgen image amplifiers constructed with a roentgen electron-optic converter serving as a base. As a result of an experiment the FCC of individual components of the amplifier have been determined, critical links in the device educed and the summary FCC of all its channels calculated. Possible ways of improving the parameters of the Soviet-made units are indicated.

Mathematics↗
PubMedDate not supplied

[New types of multi-size cameras].

The paper provides a technical evaluation of the thermographic multi-sized chambers and recorders used in them, which have appeared on the market. It compares the control images obtained by employing thermographic and conventional multi-sized chambers.

Evaluation Studies as Topic↗
PubMedDate not supplied

[Current possibilities of routine fluorography].

New Russian 12 phi 9 fluorographic apparatuses with a K phi -400 fluorographic camera are shown to have some advantages over a 12 phi 7 fluorograph. The fluorographs ensure a much better image quality in a smaller input operating dose. The use of the new generation fluorographs provides for a patient a radiation load approximate that of direct film X-ray study.

Evaluation Studies as Topic↗
PubMedDate not supplied

[An experimental study of the film parameters for general roentgenography].

The paper deals with methods for determining the technical data of a film for general X-ray study, presents basic sensitometric parameters of the films used in Russia, defines their parameters when used in as part of a kit also containing the intensifying screens made in the country, and provides recommendations on their use.

Radiography↗
PubMedDate not supplied

[Methods of assessing the parameter detail-contrast of X-ray converting receivers].

The paper analyzes methods for assessing the quality of an image in X-ray complexes (emphasis being laid on digital systems) by using the test object detail-contrast. Two possible variants of design of the test object are presented. Data of experimental assessment and comparison of the parameter detail-contrast for number of X-radiation converting receivers are given.

Evaluation Studies as Topic↗
PubMedDate not supplied

[Developing machines in Russian X-ray practice].

The paper gives technical data on different types of developing machines used in the country. Their basic specific features are described. Requirements for the developing machines are defined. The most common defects and their prevention are listed.

Humans↗
PubMedDate not supplied

[Film fluorography in current practice].

The stock of fluorographs is rather amplitidinous (N = 5000) in our country, which makes it full replacement expensive and longstanding. Therefore, it is expedient to update equipment gradually by taking into account a stepwise reduction in patients' irradiation. Five types of modernization of film fluorographs, including replacement of screens, fluorographic cameras, X-ray feeders, film sensitivity were investigated.

Fluoroscopy↗
PubMedDate not supplied

[Green-sensitive X-ray systems and specific features of working with them].

Green-sensitive intensifying screens and the similar X-ray films permit a drastic reduction in a dosage load on a patient and an increase in the sharpness of an image. Therefore there is a quest for introducing the above systems in Russian practice. The paper presents the relative characteristics of the systems ([symbol: see text]3) developed in the country and recommendations on their practical use: to increase anode voltage and to decrease exposure.

Humans↗
PubMedDate not supplied

[Quality control of X-ray screen-film sets in light of introduction of an international system of standards].

The up-to-date international standard ISO 9236-1 for control of X-ray screen-film sets is somewhat different from the Russian GOST 27048-86. The author's experimental findings have shown that the sensitivity of the sets, measured by the Russian procedure, is about 60 times higher than the international one and the mean gradient is 10-15% greater. It is best to apply the international standard to ensure the unity of measurements.

Quality Control↗
PubMedDate not supplied

[Specialized equipment for stereophlebography].

The authors describe a complex of equipment for radiodiagnosis of varicose veins of the lower limbs and for planning vascular operations. The complex is fitted out with an automatic stereocasette made in the form of an attachment to a standard radiodiagnostic system and a stereoscope for visual analysis of the stereophlebograms. The design and applications of the equipment are reviewed.

Humans↗
PubMedDate not supplied

[The ASORI stereoroentgenogrammetric system].

The ASORI stereoroentgenometric complex includes a stereoroentgenographic unit, a kit of testometric devices and a measuring stereoscope. The above unit is designed on the basis of the PYM-20 roentgenodiagnostic apparatus and provides for automatic photography. The testometric devices have inclined contrast scales and are photographed. The stereo pairs are analysed on the measuring stereoscope. The structural elements of the investigated object are measured by the unit optical marker in relation to the testometric device image. The testometric method provides for operative and accurate measuring the anatomic structures in health and disease.

Radiographic Image Enhancement↗
PubMedDate not supplied

[Vacuum cassette for radiography and its possibilities].

A new x-ray vacuum universal cassette is described. The basic technologic parameters of image quality obtained with this cassette are described as is the cassette design. The informative value of images obtained with vacuum and common mechanical cassettes is compared. Technologic parameters of the quality of all types of Russian commercial amplifying screens are presented and the types of screens distinguished preferable for use with vacuum cassettes.

Equipment Design↗