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Biomedical subjects

R V Stavitskiĭ

Publications and source records attributed to R V Stavitskiĭ.

At least 19 recordsLinked to original sources
PubMed1999

[Monitoring the changes of the lesion and of the patient's health condition in the course of radiotherapy].

The effect of therapy of malignancies is at present monitored by X-ray procedures on the basis of the dynamics of the size of lesion. Since such approach fails to provide data on the structure of lesion changes and response to treatment, it is suggested that structural changes in cells of exposed tissues can by monitored by using densitometric data obtained from mammograms and (computed) tomograms, to assess density changes in tumor and adjacent normal tissues. Recovery involves certain systemic changes which can be identified using certain peripheral blood indices; the latter are evaluated using non-statistical applications of the theory of pattern recognition and cluster analysis.

Aged↗
PubMed1991

[The quantitative x-ray assessment of dynamic pathological processes].

Two quantitative criteria of assessment of change in tissue density resulting from developing pathology or its therapy were proposed on the basis of densitometric investigations of longitudinal tomograms. These criteria are differential and integral indicators of density change. The first one characterizes change of optical density of blackening of a tomogram at the point, and the second one--along the line of densitometric scanning--can characterize the state of a part or a whole organ in a studied direction.

Absorptiometry, Photon↗
PubMed1991

[Automated subsystem of recording and analysis of data on individual dosimetric control].

An automated data bank of individual dosimetric control using Electronika MS 0507 microcomputer has been developed and is being tested now. The bank provides for data acquisition and processing, registration of the professional status of personnel, calculations, automated archives, and printing of documents. Radiation control data, accumulated at the data bank, were used to determine approaches to control a radiation situation by correcting parameters of a technological process.

Databases, Factual↗
PubMed1990

[Radiation dosage exposure of the population of the USSR from x-ray diagnosis and means for its reduction].

The paper is concerned with main values of dose exposure of the USSR population as a result of medical roentgenological investigations. The authors issue practical organizational-methodological recommendations for irradiation reduction resulting from giving up chest x-ray, a decrease in prophylactic fluorography, improvement of technical facilities for investigations of the digestive tract, and organization of roentgenoradiological departments as independent health service units.

Humans↗
PubMed1989

[A set of devices for preradiation topometry].

A set of devices including a contactless contourograph and cartograph was developed. They ensure a high accuracy of plotting topographic anatomical maps of the patient's body transverse section, taking into account tumor size parameters, for the quality planning of radiation therapy.

Equipment Design↗
PubMed1988

[Radiation control in roentgenologic studies].

A program named KODR (dosimetric monitoring of irradiation in radiodiagnosis) was developed for the SM-4 computer to ensure regional radiation monitoring. On the basis of statistical data on the distribution of x-ray studies the program made it possible to define collective effective equivalent doses and a mean value of an effective equivalent dose for one person in a given region.

Humans↗
PubMed1987

[Radiation-health aspects of methods of x-ray study of the esophagus and stomach].

The authors considered technological chains of various methods of X-ray investigations of the upper part of the G.I. tract indicating the time of performance of each stage of investigation, equivalent and effective equivalent doses. Dose exposure of patients should be taken into account at each stage and during the entire investigation while choosing methods of investigation.

Esophagus↗
PubMed1987

[Equivalent doses in x-ray studies].

The authors proposed a method of estimation of equivalent doses in x-ray investigations permitting the control of a possibility of the development of nonstochastic effects. They also considered a method for calculation of equivalent doses in x-ray investigations in the head and neck area and the rest of the patient's body.

Cerebral Angiography↗
PubMed1985

[Tissue irradiation doses in roentgenologic examinations of thoracic organs].

The paper is concerned with the results of experimental studies on the equivalent doses of irradiation of 11 organs and tissues by which one can calculate effective equivalent doses per study. Calculation were done on an anthropomorphous phantom of "conventional" man with the help of a thermoluminescent dosimetric system based on lithium fluoride. Equivalent doses were evaluated by the mean calculated value. The tabulated results make it possible to determine equivalent doses.

Humans↗
PubMed1985

[Optimization of the operating modes for short-focus x-ray therapy].

Basing on experimentally measured energetic radiation spectra of the RUM-7 x-ray unit, absorbed dose distributions in the homogeneous tissue equivalent medium were calculated. An approach to the optimization of the x-ray procedure on the basis of the incident radiation spectrum was proposed. Integral absorbed doses in a pathological focus and in the healthy tissues are used as benefit-damage indicators.

Filtration↗