An isocenter position verification device for electronic portal imaging

Physical and dosimetrical characteristics

F. Claus, Y. De Deene, V. Remouchamps, C. De Wagter, K. Van Vaerenbergh, J. Schauvliege, B. Van Duyse, B. Speleers, W. Duthoy, W. De Neve

Research output: Contribution to journalArticle

Abstract

The physical and dosimetrical characteristics of a device, designed to visualize the isocenter position on electronic portal images, were examined. The device, to be mounted on the gantry head of the accelerator, containing five spheric lead markers, was designed in order to visualize the isocenter position on portal images. A quality control device was designed to check the reliability of this technique. The disturbance of the dose distribution by the markers was studied with gel dosimetry. The use of markers resulted in a precise and accurate method to visualize the isocenter on portal images. A maximum underdosage of 11%, due to attenuation by the markers, was observed. The use of markers to visualize the isocenter position on portal images, is a fast and reliable method when analyzing patient setup errors with online electronic portal imaging.

Original languageEnglish
Pages (from-to)759-765
Number of pages7
JournalCancer/Radiotherapie
Volume5
Issue number6
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Electronic portal imaging
  • Isocenter
  • Marker

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