Improved modeling of in vivo kinetics of slowly diffusing radiotracers for tumor imaging.

ABSTRACT:

Unlabelled

Large-molecule tracers, such as labeled antibodies, have shown success in immuno-PET for imaging of specific cell surface biomarkers. However, previous work has shown that localization of such tracers shows high levels of heterogeneity in target tissues, due to both the slow diffusion and the high affinity of these compounds. In this work, we investigate the effects of subvoxel spatial heterogeneity on measured time-activity curves in PET imaging and the effects of ignoring diffusion limitation on parameter estimates from kinetic modeling.

Methods

Partial differential equations (PDE) were built to model a radially symmetric reaction-diffusion equation describing the activity of immuno-PET tracers. The effects of slower diffusion on measured time-activity curves an

SUBMITTER: Wilks MQ 

PROVIDER: S-EPMC4334373 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature