Simmons MK, Manjeshwar R, Agdeppa ED, Mattheyses RM, Kiehl TR, Montalto MC. A Computational Positron Emission Tomography Simulation Model for Imaging ?-Amyloid in Mice.
Mol Imaging Biol 2005;
7:69-77. [PMID:
15912278 DOI:
10.1007/s11307-005-0952-9]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
PURPOSE
We aimed to develop a computational simulation model for beta-amyloid (Abeta) positron emission tomography (PET) imaging.
PROCEDURES
Model parameters were set to reproduce levels of Abeta within the PDAPP mouse. Pharmacokinetic curves of virtual tracers were computed and a PET detector simulator was configured for a commercially available preclinical PET-imaging system.
RESULTS
We modeled the effects of Abeta therapy and tracer affinity on the ability to differentiate Abeta levels by PET. Varying affinity had a significant effect on the ability to quantitate Abeta. Further, PET tracers for Abeta monomers were more sensitive to the therapeutic reduction in Abeta levels than total brain amyloid. Following therapy, the decrease in total brain Abeta corresponded to the slow rate of change in total amyloid load as expected.
CONCLUSIONS
We have developed a first proof-of-concept Abeta-PET simulation model that will be a useful tool in the interpretation of preclinical Abeta imaging data and tracer development.
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