Abstract
Purpose
This study examined the feasibility of simultaneous dopamine and serotonin transporter imaging using [123I]ADAM and [99mTc]TRODAT-1 single photon emission computed tomography (SPECT).
Procedures
Simultaneous [123I]ADAM (185 MBq) and [99mTc]TRODAT-1 (740 MBq) SPECT was performed in three age-matched female Formosan rock monkeys. An asymmetric energy window was used for dual, and symmetric energy windows were used for single-isotope imaging. Oral fluoxetine (20 mg) and intravenous methylphenidate HCl (1 mg/kg) were given 24 h and 10 min, respectively, before dual-isotope SPECT to test imaging specificities of [123I]ADAM and [99mTc]TRODAT-1.
Results
Comparable image quality and uptake ratios between dual- and single-isotope SPECT scans were found. Dual-isotope SPECT in fluoxetine-pretreated monkeys showed decreased uptake of [123I]-ADAM, but not of [99mTc]TRODAT-1. Dual-isotope SPECT in methylphenidate-pretreated monkeys showed decreased [99mTc]TRODAT-1 uptake without affecting [123I]-ADAM uptake.
Conclusion
Simultaneous [123I]-ADAM and [99mTc]TRODAT-1 SPECT appears promising in nonhuman primates and may provide a suitable preclinical model with further clinical implications.
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Acknowledgments
This work was supported by the Institute of Nuclear Energy Research and National Science Council under grants 970945L, NSC94-2314-B016-042, and 97-2623-7-016-001-NU respectively. We thank Mr Jiang-Cherng Perng and Ms Tzu-Jou Chung for their technical help and preparation of the monkeys.
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Ma, KH., Lee, JK., Huang, SY. et al. Simultaneous [99mTc]TRODAT-1 and [123I]ADAM Brain SPECT in Nonhuman Primates. Mol Imaging Biol 11, 253–262 (2009). https://doi.org/10.1007/s11307-009-0197-0
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DOI: https://doi.org/10.1007/s11307-009-0197-0