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A 4-MV CT scanner for radiation therapy: the prototype system

R G Simpson, C T Chen, E A Grubbs

    Medical Physics
    |July 1, 1982
    PubMed
    Summary
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    This study modified a Varian linear accelerator into a low-cost computed tomography (CT) scanner for radiotherapy. The system offers electron density mapping for planning, patient setup verification, and anatomical monitoring during treatment.

    Area of Science:

    • Medical Physics
    • Radiotherapy Technology
    • Diagnostic Imaging

    Background:

    • Conventional radiotherapy planning relies on external imaging modalities.
    • Integrating computed tomography (CT) directly into radiotherapy accelerators offers potential for cost-effectiveness and workflow efficiency.
    • Existing CT systems may not be optimally integrated for real-time radiotherapy applications.

    Purpose of the Study:

    • To modify a Varian 4-MV isocentric therapy accelerator into a functional CT scanner.
    • To provide a low-cost computed tomography capability for radiotherapy applications.
    • To enable CT-assisted therapy planning, patient setup verification, and anatomical monitoring.

    Main Methods:

    • Modification of a Varian 4-MV linear accelerator by integrating an array of detectors.

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  • Implementation of a 'third generation' CT scanner geometry.
  • Development of data acquisition electronics and phantom studies for system evaluation.

    • Main Results:

    • The prototype system achieved a spatial resolution of 4 mm.
    • Demonstrated the ability to discriminate electron density differences of less than 1%.
    • Exhibited exact linearity over a wide range of electron densities relevant to human tissues.

    Conclusions:

    • The modified Varian accelerator successfully functions as a CT scanner.
    • This integrated system provides a cost-effective solution for CT imaging in radiotherapy.
    • The system is suitable for electron density mapping, patient setup, and treatment verification.