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Myocardial perfusion imaging and dynamic analysis with technetium-99m tetrofosmin
1Department of Nuclear Medicine, Kanazawa University Hospital, Japan.
Summary
Technetium-99m tetrofosmin is a useful myocardial perfusion imaging agent. This study found it comparable to 201Tl for detecting coronary artery stenosis, with potential for assessing heart failure.
Area of Science:
- Nuclear Medicine
- Cardiology
- Radiopharmacology
Background:
- Myocardial perfusion imaging is crucial for diagnosing coronary artery disease.
- Technetium-99m tetrofosmin is a novel agent for assessing heart muscle blood flow.
- Comparison with established agents like Thallium-201 is essential.
Purpose of the Study:
- To evaluate the diagnostic performance of 99mTc tetrofosmin in myocardial perfusion imaging.
- To compare 99mTc tetrofosmin SPECT findings with 201Tl SPECT and coronary arteriography.
- To explore the utility of kinetic parameters derived from dynamic imaging.
Main Methods:
- Dynamic acquisition and SPECT imaging in 26 patients using an exercise-rest protocol.
- Classification of myocardial segments (infarction, ischemia, partial filling) and comparison with 201Tl.
- Correlation of imaging findings with coronary arteriography for sensitivity and specificity calculations.
Main Results:
- 83% concordance between 99mTc tetrofosmin and 201Tl SPECT findings.
- Similar sensitivity and specificity for detecting coronary artery stenosis compared to 201Tl.
- Low perfusion index (k/V) observed in multi-vessel disease and heart failure.
Conclusions:
- 99mTc tetrofosmin is a valuable myocardial perfusion imaging agent.
- Its diagnostic accuracy is comparable to 201Tl for coronary artery stenosis.
- Kinetic analysis may aid in evaluating heart failure and multi-vessel disease.