open access

Vol 6, No 1 (2001)
Untitled
Published online: 2001-01-01
Submitted:
Get Citation

33. Last results and lessons of the Estro European Network on Quality Assurance in Radiotherapy

I.H. Ferreira, A. Dutreix, A. Bridier, D. Marre, J. Chavaudra, H. Svensson
DOI: 10.1016/S1507-1367(01)70403-8
·
Rep Pract Oncol Radiother 2001;6(1):42.

open access

Vol 6, No 1 (2001)
Untitled
Published online: 2001-01-01
Submitted:

Abstract

State of the Art

The EQUAL Dosimetry audit service, set-up by the ESTRO in 1998aaThe present ESTRO-EQUAL Project (MORQA) has been funded by an EU contract., is wellknown through large numbers of TL-dosimeters sent to hospitals to be irradiated in clinically relevant conditions, and read at the EQUAL Measuring Laboratory, IGR, Villejuif.

All European countries have now applied to participate (404 centres out of 880) for photon and electron beams. In relation with the IAEA, this service has been extended to 27 centres of 7 countries from Eastern and Central Europe, and the Mediterranean Basin. 757 photon beams and 277 electron beams have been checked according to the “on the beam axis” procedure.

Results and outcome

  • Reference beam output results demonstrating improvements with respect to the former EC Network, and good reliability of the procedure: mean ratios of measured to stated dose of 0.997 (SD 1.8%) for photon beams, and 1.003 (SD 2.1%) for electron beams.

  • Useful service detecting 7% of the photon beams presenting at least one check point with a deviation > 5% (2% for electron beams, but 3 times more deviations between 3 and 5%).

  • Re-checks and on-site visits in 8 centres reveal inaccuracies in TPS algorithms or input data and/or in local measurements (wedge factors, collimator aperture factors, PDD's, beams calibrations).

Conclusion

A number of dosimetric problems are still observed, even on the beam axis. Improvements should be introduced and checked before considering more sophisticated treatment techniques.

Abstract

State of the Art

The EQUAL Dosimetry audit service, set-up by the ESTRO in 1998aaThe present ESTRO-EQUAL Project (MORQA) has been funded by an EU contract., is wellknown through large numbers of TL-dosimeters sent to hospitals to be irradiated in clinically relevant conditions, and read at the EQUAL Measuring Laboratory, IGR, Villejuif.

All European countries have now applied to participate (404 centres out of 880) for photon and electron beams. In relation with the IAEA, this service has been extended to 27 centres of 7 countries from Eastern and Central Europe, and the Mediterranean Basin. 757 photon beams and 277 electron beams have been checked according to the “on the beam axis” procedure.

Results and outcome

  • Reference beam output results demonstrating improvements with respect to the former EC Network, and good reliability of the procedure: mean ratios of measured to stated dose of 0.997 (SD 1.8%) for photon beams, and 1.003 (SD 2.1%) for electron beams.

  • Useful service detecting 7% of the photon beams presenting at least one check point with a deviation > 5% (2% for electron beams, but 3 times more deviations between 3 and 5%).

  • Re-checks and on-site visits in 8 centres reveal inaccuracies in TPS algorithms or input data and/or in local measurements (wedge factors, collimator aperture factors, PDD's, beams calibrations).

Conclusion

A number of dosimetric problems are still observed, even on the beam axis. Improvements should be introduced and checked before considering more sophisticated treatment techniques.

Get Citation
About this article
Title

33. Last results and lessons of the Estro European Network on Quality Assurance in Radiotherapy

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 6, No 1 (2001)

Pages

42

Published online

2001-01-01

DOI

10.1016/S1507-1367(01)70403-8

Bibliographic record

Rep Pract Oncol Radiother 2001;6(1):42.

Authors

I.H. Ferreira
A. Dutreix
A. Bridier
D. Marre
J. Chavaudra
H. Svensson

Important: This website uses cookies. More >>

The cookies allow us to identify your computer and find out details about your last visit. They remembering whether you've visited the site before, so that you remain logged in - or to help us work out how many new website visitors we get each month. Most internet browsers accept cookies automatically, but you can change the settings of your browser to erase cookies or prevent automatic acceptance if you prefer.

By "Via Medica sp. z o.o." sp.k., ul. Świętokrzyska 73, 80–180 Gdańsk, Poland
tel.:+48 58 320 94 94, fax:+48 58 320 94 60, e-mail: journals@viamedica.pl