Journal
JOURNAL OF NUCLEAR MEDICINE
Volume 56, Issue 2, Pages 270-273Publisher
SOC NUCLEAR MEDICINE INC
DOI: 10.2967/jnumed.114.149229
Keywords
tau; amyloid beta; neocortical binding; PET
Funding
- NIH/NIA [AG035137, AG032554, AG022374, AG013616, AG012101]
- Steven and Alexandra Cohen Veterans Center
- Ministry of Health, Labor, and Welfare of Japan
- Ministry of Education, Culture, Sports, Science and Technology [23390297, 26117003]
- GE Healthcare
- Sumitomo Electric Industries, Ltd.
- Grants-in-Aid for Scientific Research [23390297, 24390179] Funding Source: KAKEN
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Neurofibrillary tau pathology and amyloid beta (A beta) plaques, characteristic lesions of Alzheimer disease (AD), show different neocortical laminar distributions. Neurofibrillary-tangle tau pathology tends to be closer to the gray matter-white matter boundary, whereas A beta is dispersed throughout the width of the cortical ribbon. Methods: Using PET radiotracers for tau and A beta lesions, we developed an image analysis tool to measure the distance of tracer-positive voxels from the gray matter-white matter boundary. We studied 5 AD and 5 healthy subjects with both F-18-THK5117 (tau) and C-11-Pittsburgh compound B (A beta) PET. Results: On average, tau-positive voxels were closer to the white matter than were A beta-positive voxels. This effect was found for all AD subjects and for all regions, both before and after regionally adjusting for the nonspecific white matter binding of both tracers. The differential laminar pattern was validated through postmortem examination. Conclusion: Within cortical lamina, distance measures may be of value in testing PET tracers for their anatomic selectivity.
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