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Technical note: computed tomography imaging with a radiotherapy simulator

J S Engelbrecht1, J Duvenage, C A Willemse

  • 1Department of Medical Physics, University of the Orange Free State, Bloemfontein, Republic of South Africa.

The British Journal of Radiology
|June 1, 1995
PubMed
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This study introduces an affordable computed tomography (CT) system using a radiotherapy simulator to create accurate patient body outlines for radiation therapy. The method achieves a spatial resolution of 4.05 mm, offering a cost-effective alternative for treatment planning.

Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Medical Imaging

Background:

  • Accurate patient cross-sectional imaging is crucial for effective radiotherapy planning.
  • Existing methods for obtaining body outlines can be expensive or require specialized equipment.

Purpose of the Study:

  • To investigate an inexpensive system for obtaining cross-sectional information and accurate body outlines using a modified radiotherapy simulator.
  • To evaluate the accuracy and feasibility of this novel computed tomography (CT) approach for radiotherapy applications.

Main Methods:

  • A radiotherapy simulator was adapted by moving the image intensifier and using a narrow fan beam of X-rays.
  • Multiple projections were acquired by rotating the simulator gantry, with video signals digitized for reconstruction.

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  • Convolution and back-projection algorithms were employed for image reconstruction, and image gradients were used for outline detection.

    • Main Results:

    • The system achieved a spatial resolution of 4.05 mm, clearly visualizing large inhomogeneities.
    • The average difference between reconstructed and actual phantom outlines was 3.0 mm, with a maximum of 10.0 mm at sharp curves.
    • The simulator-based CT system demonstrated its capability for data acquisition, processing, and display on a personal computer.

    Conclusions:

    • The developed system offers an inexpensive and effective method for acquiring patient body outlines for radiotherapy.
    • No major modifications to the radiotherapy simulator are required, making it a practical alternative.
    • This simulator CT approach provides valuable cross-sectional data for radiation therapy planning.