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Multichannel Clinical Dosimetry

#0822


Multichannel Measuring System for Clinical Dosimetry

Tech Area / Field

  • MED-RAD/Radiomedicine/Medicine
  • MED-DID/Diagnostics & Devices/Medicine
  • INS-MEA/Measuring Instruments/Instrumentation

Status
8 Project completed

Registration date
24.12.1996

Completion date
26.10.2005

Senior Project Manager
Novozhilov V V

Leading Institute
NIIIT (Pulse Techniques), Russia, Moscow

Supporting institutes

  • Gynalmazzoloto (Preciouse Metals and Diamonds), Russia, Moscow\nAssociation of Medical Physicists of Russia (AMFR), Russia, Moscow

Collaborators

  • EURATOM-Ciemat, Spain, Madrid

Project summary

The task of project is the execution of research experimental design work, directed on creation of multi channel measuring system for clinical dosimetry.

The mentioned measuring system allows increasing the accuracy of measurement of dozes for radiation therapeutics. It is known, that the irradiation dose change of 5% results in appreciable changes of reaction of tissue to irradiation. The therapeutics interval in many cases is evaluated of 10%. The accuracy of measurement of absorbed doze in ordinary clinic has reached 4%. However, the task of measurement of space distribution of dozes, especially on boundaries of bunches with due accuracy and speed is not so far resolved.

The assumed tasks for multi channel measuring systems are:


- The control and set-up of parameters of radiation therapeutics bunches;
- The dosimetry by dynamic methods of irradiation (including new, such as the dynamic wedges);
- Direct dosimetry on patients;
- The experimental research of difficult techniques of irradiation.

The work assumes the manufacturing of experimental sample of multi channel (presumably 30-channel) dosimeter, including the detector block on diamond sensitive elements and the electronic block with computer. Diamond detector has small sensitive volume and high sensitivity, comparable with silicon detectors, and at the same time has small "course with rigidity" even in comparison with ionization chambers.

Developed 30-channel dosimeter on diamond detectors considerably surpasses the existing analogues. 30-channels permit to form the doze matrixes under various particular tasks.

For example, measurement of symmetry, uniformity and concurrence radiation and light fields on two axes will be possible for one beam switch on. Minimum "course with rigidity" of diamond detectors and 30 points on structures in aggregate with mathematical methods allow conducting the measurement of structures of fields with such accuracy, that the results can be used for planning beam therapeutics.

The developing measuring system allows to speed up work on set-up of symmetry and uniformity of beams on such accelerator as "CLYNAK" from 3 days to 3 hours, thus allows to bypass expensive and unreliable mechanical devices. With its low cost the given measuring system can become main device on market of devices "QUICK CHECK".

All investigations with radiation should be in strict accordance with instructions and medical norms. Dosimetry on voluntary patients should be carried out only after careful laboratory investigations and with permission of responsible organizations.

The given project corresponds to purposes of ISTC, since qualified scientists and engineers, connected with development of techniques and devices for tests of Nuclear Weapon, as well as with execution of tests are attracted to its realization. They will not only proceed from military activity to civil needs, but also can develop the measuring system for clinical dosimetry, necessary not only for countries of CIS, but also if possible, for other foreign countries.

Project Participants suggest beginning collaboration scientific, research, commercial organizations and private experts from the USA, EC countries, Japan, Norway and South Korea. We suggest the following types of collaboration:


- exchange of information during project implementation;
- mutual review of technical reports;
- joint seminars, workshops, meetings, consultations;
- joint or parallel investigations.

Information about ISTC activities and types of collaboration is available from next address: www.istc.ru.


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