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Technetium-99m HM-PAO-labeled leukocytes in detection of inflammatory lesions: comparison with gallium-67 citrate
1Department of Nuclear Medicine, Päijät-Häme Central Hospital, Lahti, Finland.
Insights
Technetium-99m labeled leukocytes offer a promising alternative to Gallium-67 citrate for diagnosing inflammatory and infectious diseases, showing higher accuracy and specificity. Further studies are needed for chronic osteomyelitis applications.
Area of Science:
- Nuclear Medicine
- Diagnostic Imaging
Background:
- Leukocyte scintigraphy is crucial for diagnosing various diseases.
- Gallium-67 citrate has been a standard but has limitations.
Purpose of the Study:
- To compare the diagnostic efficacy of technetium-99m hexamethylpropyleneamine oxime (HM-PAO)-labeled leukocytes versus gallium-67 citrate.
Main Methods:
- Forty-three patients with suspected benign, inflammatory, or infectious diseases underwent imaging using both radiopharmaceuticals.
- Performance metrics including sensitivity, specificity, and accuracy were calculated for each agent.
Main Results:
- Technetium-99m leukocytes demonstrated 92% sensitivity, 100% specificity, and 95% accuracy.
- [67Ga]citrate showed 96% sensitivity, 63% specificity, and 81% accuracy.
- Technetium-99m leukocytes provided faster results and lower radiation exposure.
Conclusions:
- Technetium-99m labeled leukocytes are a superior diagnostic tool compared to [67Ga]citrate due to better accuracy, specificity, and patient safety.
- The utility of technetium-99m leukocytes in chronic osteomyelitis requires additional investigation.
Abstract:
Forty-three patients with suspected benign, inflammatory, or infectious diseases were imaged with [99mTc]HM-PAO-labeled leukocytes and [67Ga]citrate. Technetium-99m leukocytes showed 22 true-positive, no false-positive, 19 true-negative, and two false-negative findings and [67Ga]citrate 23, 7, 12 and 1, respectively. The sensitivity, specificity, and accuracy values with 99mTc leukocytes were 92%, 100%, and 95%, and with [67Ga]citrate 96%, 63%, and 81%. Technetium-99m leukocyte scintigraphy has a promising future in comparison with [67Ga]citrate because of the ready availability of [99mTc]HM-PAO, the good image quality, more rapid results (within few hours), and the lower radiation exposure to the patient with 99mTc leukocytes. The usefulness of 99mTc leukocytes in chronic osteomyelitis needs further evaluation.
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