Calculation of Equivalent Square Fields in Radiation Therapy by an Improved Vadash Correction Factor for Collimator Exchange Effects

Document Type : Research Articles

Authors

1 Department of Radiotherapy and Oncology, Golestan Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

2 Department of Medical Physics, Medical School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

3 Department of Radiology Technology, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

Abstract

Background and objectives: To determine the head scatter factor, a formalism presented by Vadash and Bjärngard
has been employed to assess collimator exchange effects. The aim of this study was to determine the best Vadash
correction factor (A) by introducing a new method based on the output factor measured in air for different square and
rectangular fields. Materials and Methods: A new simple mathematical method based on selection of the best dosimetric
data was proposed to obtain the A value for Vadash to predict the equivalent square field size. Measurements were
performed with a Farmer c

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References

 
Asian Pacific Journal of Cancer Prevention
Volume 19, Issue 11
November 2018
Pages 3053-3057

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History

  • Receive Date: 30 November 1999
  • Accept Date: 30 November 1999

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