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Biomedical subjects

A M Cherviakov

Publications and source records attributed to A M Cherviakov.

7 recordsLinked to original sources
PubMed1985

[Computational methods for determining the mean tissue doses during x-ray procedures].

The Soviet and Finnish authors presented a short description of two computer methods to determine doses in the patients' organs. Based on the general principles, such as a semiempirical mathematical description of dose fields and a realistic anthropomorphous phantom, these methods differed significantly in the algorithms used and ways of solving specific problems. The comparison of these methods and calculated dose values with the results of experimental measurements on the phantom showed a good convergence of the results. The divergence of calculated and experimental data by the values of the mean absorbed doses in the organs did not exceed +/- 35%. The advantages and prospects of the use of the computer methods for the evaluation of doses received by patients, were demonstrated.

Absorption↗
PubMed1985

[Basis for allowable errors in determining doses to patients during roentgenologic examinations].

Basing on the utilization of the benefit-injury concept the authors put forward an approach to the substantiation of permissible errors in the values of the mean doses intended for the patient's critical organs in x-ray examination. It was shown that in the elaboration of methods to determine the mean tissue doses one should aim at reaching a mean quadratic error of +/- 30% in their values.

Humans↗
PubMed1983

[Dosimetric characteristics of the bremsstrahlung beam from the LUE-15M medical linear electron accelerator].

The paper presents methods and results of a study of radiation-physical characteristics of inhibitory radiation beam with the Grenz energy of 15MeV generated by an electron linear accelerator LUE-15M. Special emphasis is laid on primary dosimetric information used for the planning of radiotherapy: depth doses, beam profiles, dose functions of a collimated beam. It has been shown that in general the accelerator meets the requirements of the International Electrotechnical Commission. General error in the focal absorbed dose at the expense of variable parameters of the accelerator was evaluated. It does not exceed +/- 3.5%.

Particle Accelerators↗
PubMedDate not supplied

[Optimal conditions for the formation of a radiation beam in gamma-therapeutic equipment].

The symmetry and reproducibility of the radiation field in the gamma-therapeutic device should be considered in terms of the recommendations given in the IEC Publications for medical electron accelerators, since the requirements for the exposed dose are similar in both cases. The calculations of the relationship between the source volume luminosity and the dimensions of the collimator system have shown that the increase in the diameter of the shutter hole for the operating beam results in much lower requirements for the source-shutter alignment, and so asymmetry and instability of the radiation field are essentially excluded.

Body Surface Area↗
PubMedDate not supplied

[Semi-automatic device for measuring relative distribution of doses of ionizing radiation].

During operation and adjustment of ionizing radiation sources it becomes necessary to determine relative distribution of the radiation doses. A semiautomatic device for taking and registering relative distribution of doses in any of the 3 aqueous phantom coordinates, based on an analogue recording of the 2 signals ratio on the self-recording potentiometer tape and upon synchronous movement of the transducer relative to the recording tape. A 0.05 cm3 ionization chamber was used as the transducer.

Radiation Monitoring↗