Toward whole-brain dopamine movies: a critical review of PET imaging of dopamine transmission in the striatum and cortex

Brain Imaging and Behavior
Heather LiuEvan D Morris

Abstract

The mesocorticolimbic dopamine (DA) circuit, comprising the mesolimbic and mesocortical DA pathways, plays a crucial role in reward, cognitive control, and motivation. The positron emission tomography (PET) radiotracer, [C-11]raclopride, has been used widely to image DA receptors and DA changes in the mesolimbic pathway before and after pharmacological and behavioral challenges. In certain circumstances, properties of traditional kinetic models-used to analyze dynamic PET data-are not well-suited to describing the effects of stimulus-induced DA release. To combat model shortcomings, the authors have advanced a suite of models that characterizes PET data in the presence of time-varying DA release. We review select [C-11]raclopride studies of the striatum during cigarette smoking to illustrate the advantages of such models. DA receptors occur in lower density in the cortex than the striatum. This, as well as higher relative background signal, poses a serious challenge to quantitative PET of DA changes in the mesocortical system. Novel high affinity radioligands [F-18]fallypride and [C-11]FLB457 have been used to image mesocortical DA transmission. Models with time-varying terms may also hold the key to optimizing sensitivity to c...Continue Reading

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Citations

Nov 24, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Romana KoprdovaMojmir Mach
Aug 15, 2020·Frontiers in Physiology·Jenny CeccariniChristin Y Sander

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