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  • Title: The value of multimodal imaging with 123I-FP-CIT SPECT in differential diagnosis of dementia with Lewy bodies and Alzheimer's disease dementia.
    Author: Miyagawa T, Przybelski SA, Maltais D, Min HK, Jordan L, Lesnick TG, Chen Q, Graff-Radford J, Jones D, Savica R, Knopman D, Petersen R, Kremers WK, Forsberg LK, Fields JA, Ferman TJ, Allen L, Parisi J, Reichard RR, Murray M, Dickson D, Boeve BF, Kantarci K, Lowe VJ.
    Journal: Neurobiol Aging; 2021 Mar; 99():11-18. PubMed ID: 33422890.
    Abstract:
    Reduced nigrostriatal uptake on N-(3-fluoropropyl)-2β-carbomethoxy-3β-(4-[123I]iodophenyl) nortropane (123I-FP-CIT) SPECT reflects dopamine dysfunction, while other imaging markers could be complementary when used together. We assessed how well 123I-FP-CIT SPECT differentiates dementia with Lewy bodies (DLBs) from Alzheimer's disease dementia (ADem) and whether multimodal imaging provides additional value. 123I-FP-CIT SPECT, magnetic resonance imaging, [18F]2-fluoro-deoxy-D-glucose-positron emission tomography (PET), and 11C-Pittsburgh compound B (PiB)-PET were assessed in 35 participants with DLBs and 14 participants with ADem (autopsy confirmation in 9 DLBs and 4 ADem). Nigrostriatal dopamine transporter uptake was evaluated with 123I-FP-CIT SPECT using DaTQUANT software. Hippocampal volume was calculated with magnetic resonance imaging, cingulate island sign ratio with FDG-PET, and global cortical PiB retention with PiB-PET. The DaTQUANT z-scores of the putamen showed the highest c-statistic of 0.916 in differentiating DLBs from ADem among the analyzed imaging biomarkers. Adding another imaging modality to 123I-FP-CIT SPECT had c-statistics ranging from 0.968 to 0.975, and 123I-FP-CIT SPECT in combination with 2 other imaging modalities presented c-statistics ranging from 0.987 to 0.996. These findings suggest that multimodal imaging with 123I-FP-CIT SPECT aids in differentiating DLBs and ADem and in detecting comorbid Lewy-related and Alzheimer's disease pathology in patients with DLBs and ADem.
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