Design and dosimetry characteristics of a soft-docking system for intraoperative radiation therapy

Peter Björk, Tommy Knöös, Per Nilsson, Kurt Larsson

Research output: Contribution to journalArticlepeer-review

19 Citations (SciVal)

Abstract

PURPOSE: The design concept and the dosimetric characteristics of an applicator system for intraoperative radiation therapy (IORT) with special emphasis on alignment methods, the effect of a plastic scatterer in the beam, radiation leakage, and misalignment dosimetry, are presented in this paper. MATERIALS AND METHODS: A soft-docking system for a linear accelerator, which enables collimation of electron beams (4-22 MeV) for IORT has been developed. The system includes twenty-one circular polymethylmethacrylate (PMMA) treatment cones of different lengths, diameters and end angles. All in-water measurements are made using p-type silicon diode detectors. RESULTS: The effect of introducing a PMMA scatterer in the therapeutic beam includes increased surface dose values (above 83% for all nominal electron energies and for all cones) and improved dose homogeneity within the therapeutic range. Electrons scattered from the inside wall of the cone result in dose profile horns at depth of dose maximum always lower than 109%. The radiation leakage outside the cone is less than 13%. Large changes in the dose profiles occur if the intraoperative cone is misaligned more than 0.5. CONCLUSION: The alignment procedure of the soft-docking system is easy to handle and the applicator design provides adequate collimation of electron beams for IORT.
Original languageEnglish
Pages (from-to)527-533
JournalInternational Journal of Radiation Oncology, Biology, Physics
Volume47
Issue number2
DOIs
Publication statusPublished - 2000

Subject classification (UKÄ)

  • Radiology, Nuclear Medicine and Medical Imaging

Keywords

  • Intraoperative radiation therapy
  • Electron dosimetry
  • Applicator system
  • Radiation leakage
  • Linear accelerator

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