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The ESTRO-QUALity assurance network (EQUAL).

I H Ferreira1, A Dutreix, A Bridier

  • 1EQUAL Measuring Laboratory, Service de Physique, Institut Gustave-Roussy, 39 rue Camille Desmoulins, 94805 Villejuif, France. equal@igr.fr

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
|June 28, 2000
PubMed
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The European Society for Radiotherapy and Oncology Quality Assurance network (EQUAL) audited 102 centers using mailed thermoluminescent dosimeters (TLD). Results show a small percentage of deviations in radiotherapy dose delivery, highlighting the need for quality assurance.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Quality Assurance

Background:

  • The European Society for Radiotherapy and Oncology (ESTRO) established the Quality Assurance network (EQUAL) to assess external radiotherapy dose delivery.
  • External audits utilize mailed thermoluminescent dosimeters (TLDs) for measurements under reference and non-reference conditions.

Purpose of the Study:

  • To evaluate the accuracy of radiation dose delivery in external radiotherapy through a quality assurance program.
  • To identify potential deviations in dose output, depth dose, and wedge transmission factors.

Main Methods:

  • Thermoluminescent dosimeters (TLDs) made of LiF powder (DTL 937) were read using an automatic TLD reader (PCL 3).
  • Participating centers delivered a calculated absorbed dose of 2 Gy to TLDs for up to three photon energies, with 10 on-axis points per beam.

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  • Key parameters assessed included reference beam output, output variation with collimator settings, depth dose data, and wedge transmission factors.

    • Main Results:

    • In 1998, 102 centers and 235 beams (28 Co-60, 207 X-ray) were audited.
    • Approximately 3% of reference beam outputs and percentage depth doses deviated beyond the +/-5% tolerance.
    • Deviations of 6% were observed for beam output variation and wedge transmission factors, particularly for large/rectangular fields and wedged beams.

    Conclusions:

    • The EQUAL program underscores the critical role of quality assurance in radiotherapy, especially for non-reference points on the beam axis.
    • Continuous monitoring and adherence to quality standards are essential for ensuring accurate and safe radiation therapy delivery.