Abstract
Simultaneous dual-isotope SPECT imaging with 201Tl and 123I-β-methyl-p-iodophenylpentadecanoic acid (BMIPP) is used to study the perfusion–metabolism mismatch. It predicts post-ischemic functional recovery by detecting stunned myocardium. On the other hand, 99mTc-MIBI is another radioisotope widely used in myocardial perfusion imaging because of its better image quality and lower radiation exposure than 201Tl. However, since the photopeak energies of 99mTc and 123I are very similar, crosstalk hampers the simultaneous use of these two radioisotopes. To overcome this problem, we conducted simultaneous dual-isotope imaging study using the D-SPECT scanner (Spectrum-Dynamics, Israel) which has a novel detector design and excellent energy resolution. We first conducted a basic experiment using cardiac phantom to simulate the condition of normal perfusion and impaired fatty acid metabolism. Subsequently, we prospectively recruited 30 consecutive patients who underwent successful percutaneous coronary intervention for acute myocardial infarction, and performed 99mTc-MIBI/123I-BMIPP dual-isotope imaging within 5 days after reperfusion. Images were interpreted by two experienced cardiovascular radiologists to identify the infarcted and stunned areas based on the coronary artery territories. As a result, cardiac phantom experiment revealed no significant crosstalk between 99mTc and 123I. In the subsequent clinical study, 99mTc-MIBI/123I-BMIPP dual-isotope imaging in all participant yielded excellent image quality and detected infarcted and stunned areas correctly when compared with coronary angiographic findings. Furthermore, we were able to reduce radiation exposure to significantly approximately one-eighth. In conclusion, we successfully demonstrated the practical application of simultaneous assessment of myocardial perfusion and fatty acid metabolism by 99mTc-MIBI and 123I-BMIPP using a D-SPECT cardiac scanner. Compared with conventional 201TlCl/123I-BMIPP dual-isotope imaging, the use of 99mTc-MIBI instead of 201TlCl improves image quality as well as lowers radiation exposure.
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The authors have no conflict of interest. We thank staff at our hospital for assistance in data collection and all patients for their participation in the study.
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Ko, T., Utanohara, Y., Suzuki, Y. et al. A preliminary feasibility study of simultaneous dual-isotope imaging with a solid-state dedicated cardiac camera for evaluating myocardial perfusion and fatty acid metabolism. Heart Vessels 31, 38–45 (2016). https://doi.org/10.1007/s00380-014-0578-4
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DOI: https://doi.org/10.1007/s00380-014-0578-4