Cited by 92Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsMedical Imaging Techniques and Applications

Flortaucipir F 18 quantitation using parametric estimation of reference signal intensity.

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Southekal, Sudeepti, Devous, Michael D., Kennedy, Ian, Navitsky, Michael, Lu, Ming, Joshi, Abhinay D., Pontecorvo, Michael J., Mintun, Mark A.·2018·Journal of Nuclear Medicine

Abstract

PET imaging of tau pathology in Alzheimer disease may benefit from the use of white matter reference regions. These regions have shown reduced variability compared with conventional cerebellar regions in amyloid imaging. However, they are susceptible to contamination from partial-volume blurring of tracer uptake in the cortex. We present a new technique, PERSI (Parametric Estimation of Reference Signal Intensity), for flortaucipir F 18 count normalization that leverages the advantages of white matter reference regions while mitigating potential partial-volume effects. Methods: Subjects with a clinical diagnosis of Alzheimer disease, mild cognitive impairment, or normal cognition underwent T1-weighted MRI and florbetapir imaging (to determine amyloid [Aβ] status) at screening and flortaucipir F 18 imaging at single or multiple time points. Flortaucipir F 18 images, acquired as 4 × 5 min frames 80 min after a 370-MBq injection, were motion-corrected, averaged, and transformed to Montreal Neurological Institute (MNI) space. The PERSI reference region was calculated for each scan by fitting a bimodal gaussian distribution to the voxel-intensity histogram within an atlas-based white matter region and using the center and width of the lower-intensity peak to identify the voxel intensities to be included. Four conventional reference regions were also evaluated: whole cerebellum, cerebellar gray matter, atlas-based white matter, and subject-specific white matter. SUVr (standardized uptake value ratio) was calculated for a statistically defined neocortical volume of interest. Performance was evaluated with respect to test–retest variability in a phase 2 study of 21 subjects (5–34 d between scans). Baseline variability in controls (SD of SUVr and ΔSUVr) and effect sizes for group differences (Cohen d; Aβ-positive impaired vs. Aβ-negative normal) were evaluated in another phase 2 study with cross-sectional data (n = 215) and longitudinal data (n = 142/215; 18 ± 2 mo between scans). Results: PERSI showed superior test–retest reproducibility (1.84%) and group separation ability (cross-sectional Cohen d = 9.45; longitudinal Cohen d = 2.34) compared with other reference regions. Baseline SUVr variability and ΔSUVr were minimal in Aβ control subjects with no specific flortaucipir F 18 uptake (SUVr, 1.0 ± 0.04; ΔSUVr, 0.0 ± 0.02). Conclusion: PERSI reduced variability while enhancing discrimination between diagnostic cohorts. Such improvements could lead to more accurate disease staging and robust measurements of changes in tau burden over time for the evaluation of putative therapies.

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  1. Huang S, Phelps M. Principles of tracer kinetic modeling in positron emission tomography and autoradiography. In: Phelps ME, Mazziotta JC, Schelbert HR, eds. Positron Emission Tomography and Autoradiography: Principles and Applications for the Brain and Heart. New York, NY: Raven Press; 1986: 287-346.
  2. Southekal S, Devous MD Sr, Navitsky M, Kennedy I, Joshi AD, Mintun MA. Correction for acquisition time discrepancies in SUVr analyses of 18 F-AV1451 tau images. In: 10th Human Amyloid Imaging: Conference Program and Abstracts. World Events Forum website. http://www.worldeventsforum.com/hai/wp-content/ uploads/2016/12/HAI2016_Book-1-6-16.pdf. Published 2016. Accessed March 15, 2018.

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Authors
Southekal, S., Devous, M. D., Kennedy, I., Navitsky, M., Lu, M., Joshi, A. D., Pontecorvo, M. J., & Mintun, M. A.
Affiliations
Avid Radiopharmaceuticals (United States) (US)
Venue
Journal of Nuclear Medicine
Published
2017-11-30
Volume
59
Issue
6
Pages
944-951
ISSN
  • 0161-5505 (ISSN-L)
  • 2159-662X
OpenAlex
W2771176174
Cited by
92
References
34
Citations by year
2026: 7 · 2025: 5 · 2024: 10 · 2023: 12 · 2022: 14 · 2021: 13 · 2020: 10 · 2019: 13 · 2018: 7 · 2017: 1
FWCI
6.96
Type
journal article
Language
en
Open access
Locations
  • Journal of Nuclear Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Eli Lilly and Company
  • Avid Radiopharmaceuticals
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Medical Imaging Techniques and Applications
Keywords
tau PET, Persis, standardized uptake value ratio, test-retest reproducibility, Alzheimer's disease, mild cognitive impairment, amyloid status, florbetapir
MeSH terms
Aged, Alzheimer Disease, Carbolines, Female, Humans, Image Processing, Computer-Assisted, Male, Reference Standards, Positron-Emission Tomography

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