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Technetium-99m HMPAO labeled leukocytes in inflammation imaging
K Uno1, K Yoshikawa, K Imazeki
1Department of Radiology, Chiba University School of Medicine, Japan.
Annals of Nuclear Medicine
|July 1, 1991
Summary
Technetium-99m-HMPAO (Tc-99m-HMPAO) labeled leukocyte imaging is a sensitive diagnostic tool for infections. While generally accurate, renal function issues can lead to false results in specific pyonephrosis cases.
Area of Science:
- Nuclear Medicine
- Diagnostic Imaging
- Radiopharmacology
Background:
- Leukocyte imaging is crucial for diagnosing infections.
- Technetium-99m-HMPAO (Tc-99m-HMPAO) offers potential advantages for leukocyte labeling.
- Evaluating the diagnostic performance of Tc-99m-HMPAO labeled leukocytes is important.
Purpose of the Study:
- To assess the efficacy and diagnostic accuracy of Tc-99m-HMPAO labeled leukocyte imaging.
- To compare Tc-99m-HMPAO leukocyte imaging with other diagnostic modalities.
- To identify potential limitations and confounding factors in Tc-99m-HMPAO leukocyte imaging.
Main Methods:
- Tc-99m-HMPAO labeled leukocyte imaging was performed in 19 patients.
- Imaging was conducted 3-5 hours post-reinjection of labeled leukocytes.
- Standardized analysis of image distribution and diagnostic outcomes was performed.
Main Results:
- The imaging demonstrated high sensitivity (93%), specificity (100%), and accuracy (95%).
- Normal physiological uptake was observed in the gallbladder, colon, kidneys, and urinary bladder.
- One false negative case occurred in pyonephrosis with impaired renal function; potential for false positives/negatives due to ureteral obstruction or poor renal function was noted.
Conclusions:
- Tc-99m-HMPAO labeled leukocyte imaging shows significant promise and advantages over Indium-111 labeled leukocytes.
- Careful consideration of renal function and ureteral obstruction is necessary to avoid misinterpretation.
- This technique is a valuable tool for infection detection, with specific caveats for renal pathology.