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[Practical method for six-dimensional online correction system with image guided radiation therapy].

Yuji Nakaguchi1, Fujio Araki, Tomohiro Kouno

  • 1Department of Radiological Technology, Kumamoto University Hospital, and Graduate School of Health Sciences, Kumamoto University.

Nihon Hoshasen Gijutsu Gakkai Zasshi
|November 23, 2012
PubMed
Summary

A new method corrects coordinate errors in image-guided radiation therapy (IGRT) using ExacTrac and HexaPOD systems. This correction improves positional accuracy to within 1 mm, comparable to ExacTrac Robotics, enhancing patient safety.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Image-Guided Therapy

Background:

  • Image-guided radiation therapy (IGRT) relies on accurate patient positioning.
  • Coordinate transformation errors can occur between imaging systems and treatment couches.
  • The ExacTrac X-ray system and HexaPOD couch are commonly used in IGRT.

Purpose of the Study:

  • To develop and evaluate a correction method for coordinate transformation errors.
  • To improve positional accuracy when using the ExacTrac and HexaPOD systems in IGRT.
  • To compare the accuracy of the developed method against ExacTrac Robotics and no correction.

Main Methods:

  • Developed a two-step correction method for the iBeam evo couch top (Elekta).
  • Compared positional accuracy with and without the correction method.
  • Utilized the ExacTrac X-ray system (BrainLAB) for imaging and comparison.
  • Performed paired t-tests to assess statistical significance (P>0.1).

Main Results:

  • The correction method for HexaPOD achieved positional accuracy within 1 mm.
  • No correction resulted in maximal errors of 4.52 mm, with the couch failing to reach the correct position.
  • The developed method showed no significant difference compared to ExacTrac Robotics.
  • Large correction values for rotational directions were associated with decreased positional accuracy.

Conclusions:

  • The developed correction method significantly improves positional accuracy in IGRT.
  • Minimizing setup errors, especially in rotational directions, is crucial for effective IGRT.
  • This method offers a viable solution for mitigating coordinate transformation errors in combined ExacTrac and HexaPOD systems.