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Emission computerized axial tomography from multiple gamma-camera views using frequency filtering

J L Pelletier, C Milan, C Touzery

    European Journal of Nuclear Medicine
    |January 1, 1980
    PubMed
    Summary
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    Emission computerized axial tomography (ECAT) imaging is feasible using standard gamma cameras. A fast convolution algorithm reconstructs images from patient rotation data, offering good results for phantoms and patients.

    Area of Science:

    • Nuclear Medicine
    • Medical Imaging
    • Computerized Tomography

    Background:

    • Emission computerized axial tomography (ECAT) offers advanced imaging capabilities.
    • Gamma cameras are widely available in nuclear medicine departments.

    Purpose of the Study:

    • To present a feasible method for ECAT using standard gamma cameras.
    • To describe a fast convolution algorithm for image reconstruction.

    Main Methods:

    • Data acquisition via patient rotation in front of a gamma camera.
    • Implementation of a fast convolution algorithm involving Fourier transforms and filtering.
    • Application of inverse transform for image back-projection.

    Main Results:

    • Successful execution of the algorithm on phantoms and patients.

    Related Experiment Videos

  • Algorithm demonstrates good image resolution and noise suppression.
  • Capability to account for attenuation in single photon events.

    • Conclusions:

    • ECAT is achievable with existing nuclear medicine equipment.
    • The described convolution algorithm provides effective image reconstruction.
    • This method has potential for implementation in specific diagnostic applications.