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Leucocyte radiolabelling techniques: practical aspects

M Frier1

  • 1Queen's Medical Centre, Nottingham, UK.

Scandinavian Journal of Gastroenterology. Supplement
|January 1, 1994
PubMed
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Radiolabeled white blood cells effectively image inflammation. Technetium-99m-HMPAO is preferred for acute conditions like inflammatory bowel disease due to simpler labeling and better imaging quality.

Area of Science:

  • Nuclear Medicine
  • Immunology
  • Gastroenterology

Background:

  • Radiolabeled leukocytes are crucial for visualizing inflammatory processes.
  • Current methods involve ex vivo radiolabeling of mixed white blood cells or purified granulocytes.

Purpose of the Study:

  • To compare the utility of different radiolabeling techniques for imaging inflammation.
  • To evaluate the suitability of Technetium-99m-HMPAO and Indium-111 for acute and chronic inflammatory conditions.

Main Methods:

  • Ex vivo radiolabeling of mixed white blood cells with 99mTc or 111In.
  • Purification of mixed white blood cells to granulocytes for enhanced 111In imaging.
  • Comparison of 99mTc-HMPAO and 111In for imaging acute and chronic inflammation.

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Main Results:

  • 99mTc-HMPAO offers simpler labeling, better image quality, and favorable dosimetry for acute inflammation, including inflammatory bowel disease.
  • 111In, with its longer half-life, is more appropriate for imaging chronic inflammation like osteomyelitis.
  • Purification to granulocytes is necessary for optimal 111In imaging.

Conclusions:

  • 99mTc-HMPAO is the preferred agent for investigating acute inflammation due to its practical advantages.
  • 111In remains valuable for chronic inflammatory conditions requiring longer imaging windows.
  • In vivo radiolabeling of granulocytes remains a challenging area for future research.