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Ceberg

Crister Ceberg

Professor

Ceberg

A note on the interpretation of the gamma evaluation index

Författare

  • Crister Ceberg

Summary, in English

The gamma evaluation method has become the gold standard for the comparison between measured and calculated absorbed dose distributions. However, test criteria and failure rate tolerance levels have hitherto normally been based on empirical evidence, rather than rigorous statistical analysis. In this work, it is proposed that the gamma-evaluation method could be reinterpreted such that the absorbed dose difference and distance-to-agreement criteria are replaced by the standard deviations of the associated uncertainties. By comparison between absorbed dose calculations and simulated measurements for clinically realistic test cases in 1D and 2D, it is then shown that the resulting squared gamma distribution follows a chi-squared distribution with one degree of freedom. This result can be used to test the statistical significance of measured deviations, and to determine proper failure rate tolerance levels in clinical radiotherapy quality control.

Avdelning/ar

  • Medicinsk strålningsfysik, Lund

Publiceringsår

2013

Språk

Engelska

Sidor

012082-012082

Publikation/Tidskrift/Serie

7th International Conference on 3D Radiation Dosimetry (IC3DDose)

Volym

444

Dokumenttyp

Konferensbidrag

Förlag

IOP Publishing

Ämne

  • Radiology, Nuclear Medicine and Medical Imaging

Conference name

7th International Conference on 3D Radiation Dosimetry (IC3DDose)

Conference date

2012-11-04 - 2012-11-08

Conference place

Sydney, Australia

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 1742-6596
  • ISSN: 1742-6588