A method to analyze 2-dimensional daily radiotherapy portal images from an on-line fiber-optic imaging system

Mary Lee Graham, Abel Y. Cheng, Lewis Y. Geer, W. Robert Binns, Michael W. Vannier, John W. Wong

Research output: Contribution to journalArticle

Abstract

On-line radiotherapy imaging systems allow convenient treatment verification and generate a wealth of data. Quantitative analysis of data will provide important information about the nature of treatment variations. Using an in house fiber-optic imaging system to acquire daily portal images for five patients, we have developed a method to analyze the cumulative positional variation of blocks in the 2-dimensional images. For each beam arrangement used to treat a particular patient, a reference portal image was established. All other images for that patient were registered with respect to the anatomical landmarks visible on the reference image. Two-dimensional frequency distributions describing the overlap of the blocks during the course of treatment were then calculated and super imposed on the reference image. Results of the analysis show positional and quantitative information about the daily variation in block placement, and appeared to be site-dependent. Long term verification studies using on-line imaging systems will be important in the understanding of treatment uncertainties.

Original languageEnglish (US)
Pages (from-to)613-619
Number of pages7
JournalInternational journal of radiation oncology, biology, physics
Volume20
Issue number3
DOIs
StatePublished - Mar 1991

Keywords

  • Daily treatment verification
  • On-line radiotherapy imaging
  • Treatment uncertainties

ASJC Scopus subject areas

  • Radiation
  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research

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