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Imaging of amyloid deposition in human brain using positron emission tomography and [18F]FACT: comparison with [11C]PIB

European Journal of Nuclear Medicine and Molecular Imaging Aims and scope Submit manuscript

Abstract

Purpose

The characteristic neuropathological changes in Alzheimer’s disease (AD) are deposition of amyloid senile plaques and neurofibrillary tangles. The 18F-labeled amyloid tracer, [18F]2-[(2-{(E)-2-[2-(dimethylamino)-1,3-thiazol-5-yl]vinyl}-1,3-benzoxazol-6-yl)oxy]-3-fluoropropan-1-ol (FACT), one of the benzoxazole derivatives, was recently developed. In the present study, deposition of amyloid senile plaques was measured by positron emission tomography (PET) with both [11C]Pittsburgh compound B (PIB) and [18F]FACT in the same subjects, and the regional uptakes of both radiotracers were directly compared.

Methods

Two PET scans, one of each with [11C]PIB and [18F]FACT, were performed sequentially on six normal control subjects, two mild cognitive impairment (MCI) patients, and six AD patients. The standardized uptake value ratio of brain regions to the cerebellum was calculated with partial volume correction using magnetic resonance (MR) images to remove the effects of white matter accumulation.

Results

No significant differences in the cerebral cortical uptake were observed between normal control subjects and AD patients in [18F]FACT studies without partial volume correction, while significant differences were observed in [11C]PIB. After partial volume correction, the cerebral cortical uptake was significantly larger in AD patients than in normal control subjects for [18F]FACT studies as well as [11C]PIB. Relatively lower uptakes of [11C]PIB in distribution were observed in the medial side of the temporal cortex and in the occipital cortex as compared with [18F]FACT. Relatively higher uptake of [11C]PIB in distribution was observed in the frontal and parietal cortices.

Conclusion

Since [18F]FACT might bind more preferentially to dense-cored amyloid deposition, regional differences in cerebral cortical uptake between [11C]PIB and [18F]FACT might be due to differences in regional distribution between diffuse and dense-cored amyloid plaque shown in the autoradiographic and histochemical assays of postmortem AD brain sections.

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Acknowledgments

This study was supported in part by “Japan Advanced Molecular Imaging Program (J-AMP)” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japanese Government, a Grant-in-Aid for Comprehensive Research on Dementia (No. 11103404) from the Ministry of Health, Labour and Welfare, and a Grant-in-Aid from the Mitsubishi Pharma Research Foundation. We thank Mr. Katsuyuki Tanimoto and Mr. Takahiro Shiraishi for their assistance in performing the PET experiments at the National Institute of Radiological Sciences. We also thank Ms. Kazuko Suzuki and Ms. Izumi Izumida of the National Institute of Radiological Sciences for their help as clinical research coordinators.

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Correspondence to Hiroshi Ito.

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Ito, H., Shinotoh, H., Shimada, H. et al. Imaging of amyloid deposition in human brain using positron emission tomography and [18F]FACT: comparison with [11C]PIB. Eur J Nucl Med Mol Imaging 41, 745–754 (2014). https://doi.org/10.1007/s00259-013-2620-7

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  • DOI: https://doi.org/10.1007/s00259-013-2620-7

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