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Biomedical subjects

A Dutreix

Publications and source records attributed to A Dutreix.

108 records · Page 6Linked to original sources
PubMedDate not supplied

Calculation of the dose delivered to organs outside the radiation beams.

An organ dose calculation based on measurements is described which models the total dose delivered outside a beam from 10 to 50 cm from the field edge. The dose distribution is parametrized for each beam energy as a function of depth, distance from the edge, and field size and shape. The algorithm also takes into account the organ location relative to the beam. Comparisons with measurements in an Alderson phantom using thermoluminescent dosimetry are given for various typical treatments.

Cobalt Radioisotopes↗
PubMedDate not supplied

A mathematical child phantom for the calculation of dose to the organs at risk.

In order to calculate the doses received by the organs of 530 children treated by radiation for cancer between 1945 and 1969 at the G. Roussy Institute, we have developed a computer program for organ location calculation. To calculate the location of each child's organs of interest at the time of the treatment, only two parameters are necessary; sex and height or sex and age when the height at the time of the treatment is unknown. The algorithm is based on the metric studies of growth known as auxology. Each organ is located by one point representing its center. The model has been checked on 100 healthy children.

Aging↗
PubMedDate not supplied

A general method to perform dose calculations along the axis of symmetrical and asymmetrical photon beams.

Many manufacturers of modern linacs provide collimators with jaws that can be set asymmetrically. In the present work, the authors propose the use of a product of four independent output factors related to the four jaws to calculate the reference dose rate of asymmetrical fields. Each of these factors is normalized to the maximum opening of the collimator. A general algorithm for symmetrical and asymmetrical fields is proposed for dose calculation. Calculations have been checked by measurements at the reference depth in a 4-MV x-ray beam.

Algorithms↗
PubMedDate not supplied

Quality assurance in brachytherapy: the role of the ICRU in achieving uniformity in dose and volume specification for reporting.

A quality assurance programme in brachytherapy implies a general consensus on the method of dose and volume specification for reporting. This in turn implies a consensus on certain definitions of terms and concepts. For several decades, the ICRU (International Commission on Radiation Units and Measurements) has been actively involved in an effort to reach a consensus between different brachytherapy centres worldwide, and to improve uniformity in reporting. The ICRU has prepared two reports containing recommendations for reporting brachytherapy treatments. The first, report #38 published in 1985, deals with intracavitary therapy in gynecology. The second deals with interstitial therapy, and is now in press. A summary of these two ICRU reports is presented here. Some definitions of terms and concepts are first recalled and discussed: Total Reference Air Kerma (TRAK), gross tumor volume (GTV), clinical target volume (CTV), treated volume, mean central dose, dose uniformity parameters, etc. Specific recommendations for reporting interstitial and intracavitary brachytherapy are then presented.

Brachytherapy↗