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[Correlation analysis between patlak plot and DAR using 11C-methionine PET]

H Yoshida1, K Yoshikawa, K Imazeki

  • 1Department of Radiology, School of Medicine, Chiba University.

Nihon Igaku Hoshasen Gakkai Zasshi. Nippon Acta Radiologica
|July 1, 1995
PubMed
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Positron emission tomography (PET) with 11C-methionine effectively visualizes lymphoma tumors. Differential absorption ratio (DAR) provides results comparable to dynamic data analysis for methionine metabolism.

Area of Science:

  • Nuclear Medicine
  • Oncology
  • Biochemistry

Background:

  • Positron emission tomography (PET) is a powerful imaging technique.
  • 11C-methionine is a radiotracer used to study amino acid metabolism.
  • Accurate kinetic modeling is crucial for quantitative PET analysis.

Observation:

  • Seven patients with lymphoma underwent PET scans using 11C-methionine.
  • A three-compartment model and Patlak graphical method were employed for dynamic data analysis.
  • Plasma samples were treated with trichloroacetate to isolate the acid-soluble fraction, correcting for protein binding.

Findings:

  • All tumors demonstrated significant 11C-methionine accumulation, reaching a plateau within 30 minutes.
  • The kinetic parameter Ki and differential absorption ratio (DAR) were calculated.

Related Experiment Videos

  • A strong correlation (0.875) was observed between Ki and DAR, suggesting their interchangeability.

    • Implications:

    • Differential absorption ratio (DAR) offers a simplified yet reliable method for analyzing methionine metabolism in tumors.
    • This finding can streamline PET data analysis in clinical oncology settings.
    • The study validates DAR as a surrogate for dynamic PET data analysis in lymphoma imaging.