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Related Experiment Videos

Measured attenuation correction methods.

H Ostertag1, W K Kübler, J Doll

  • 1Deutsches Krebsforschungszentrum, Institut für Radiologie und Pathophysiologie, Heidelberg, Federal Republic of Germany.

European Journal of Nuclear Medicine
|January 1, 1989
PubMed
Summary
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Accurate positron emission tomography (PET) imaging requires precise attenuation correction. This overview explores transmission measurement methods using external sources like 68Ge/68Ga, detailing techniques to improve accuracy and reduce artifacts for better quantitative results.

Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Physics

Background:

  • Accurate local radioactivity quantification in Positron Emission Tomography (PET) relies on precise attenuation correction.
  • Attenuation correction factors can vary significantly, from 4-5 in brain imaging to 50-100 in whole-body scans.
  • Transmission measurements using external positron-emitting sources are crucial for determining these correction factors.

Purpose of the Study:

  • To provide an overview of methods for determining attenuation correction factors via transmission measurements.
  • To discuss challenges and solutions for accurate attenuation correction in PET.
  • To highlight techniques enabling simultaneous emission and transmission scans.

Main Methods:

  • Utilizing external positron-emitting sources, commonly the 68Ge/68Ga generator.

Related Experiment Videos

  • Employing ring-shaped, rotating point, or rotating line sources in modern PET scanners.
  • Implementing masking techniques (single and double) to suppress random and scattered events and enable simultaneous scans.

    • Main Results:

    • The additional patient dose from transmission sources is typically a small fraction of the emission scan dose.
    • Masking techniques effectively reduce random and scattered events in transmission scans.
    • A double masking technique allows for simultaneous emission and transmission scans.

    Conclusions:

    • Transmission measurements are essential for accurate PET attenuation correction.
    • Various source geometries and masking strategies address challenges like event contamination and timing mismatches.
    • Simultaneous emission-transmission imaging is feasible, improving workflow and potentially reducing patient burden.