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Biomedical subjects

H Rahim

Publications and source records attributed to H Rahim.

23 records · Page 2Linked to original sources
PubMed1986

[Qualitative comparison of different irradiation technics].

A factor is defined which allows a quantitative comparison of different irradiation schemes. In this factor, the spatial as well as chronological dose distribution is taken into consideration, further it contains the varying radiosensitivity of the additionally exposed tissues. So the comparison of the radiobiologic effectiveness of different irradiation schemes based on this factor is more instructive than a simple comparison of the total dose. The study is continued by an analysis of the possible sources of error influencing the quality of a radiotherapy.

Cobalt Radioisotopes↗
PubMed1985

[Quantification of the biological effect of photons and electrons. 2. Probability of tumor destruction].

The study comprises two subjects: the probability of destruction of the irradiated tumor and the tumor immunogenicity and its changes in the course of radiotherapy. The distribution of Poisson was adopted in order to describe the tumor destruction. The probability of tumor destruction is analysed under consideration of the "critical cell number". The other part of the study deals with the immune system and its radiosensitivity. It is demonstrated that the patient's immune reaction can contribute to the tumor destruction if the irradiation planning is made in an adequate manner. Furthermore, different irradiation techniques are compared to one another. Pendulum therapy, especially with large fields, seems to be no superior method despite its geometric advantages.

Animals↗
PubMed1985

[Energy dependence of the response of thermoluminescent dosimetry to high-energy electrons].

Sufficiently reproducible measuring results can be achieved even for simple TLD units by a control procedure which is easy to apply. It is demonstrated by means of the proposed control procedure that the dependence on energy of the TLD-100 rods is negligible in case of a measuring uncertainty of +/- 3%. This is confirmed by depth dose measurements in comparison with ionisation measurements and semiconductor measurements. TLD-100 rods are thus suitable for the measurement of the dose distribution in a typical solid phantom, such as the humanoid phantom of Alderson Research Laboratories, Long Island, N.Y. The results of these measurements, especially with regard to the verification of the irradiation planning, will be presented in a later report.

Fast Neutrons↗
PubMed1983

[Quantification of the biologic effect of photons and electrons. I. Analysis of the injury factor in healthy tissue].

After having given a review of the NSD conception and the justification of its application, an injury factor based on NSD values is specified. This factor takes into consideration the dose distribution in time and space. In case of irradiation of a lung carcinoma for example, this factor is 49% for the spinal marrow. The injury factor can make possible a better comparison between different fractionation schemes and irradiation methods. Further tests and clinical measuring data are, however, still necessary.

Animals↗