期刊
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
卷 39, 期 1, 页码 131-146出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0271678X17725418
关键词
Cerebral blood flow; dopamine receptor imaging; pharmacokinetic modeling; positron emission tomography; functional magnetic resonance imaging
资金
- National Institute of Health [P41EB015896, S10RR026666, S10RR022976, S10RR019933, S10RR017208]
The potential effects of changes in blood flow on the delivery and washout of radiotracers has been an ongoing question in PET bolus injection studies. This study provides practical insight into this topic by experimentally measuring cerebral blood flow (CBF) and neuroreceptor binding using simultaneous PET/MRI. Hypercapnic challenges (7% CO2) were administered to non-human primates in order to induce controlled increases in CBF, measured with pseudo-continuous arterial spin labeling. Simultaneously, dopamine D-2/D-3 receptor binding of [C-11]raclopride or [F-18]fallypride was monitored with dynamic PET. Experiments showed that neither time activity curves nor quantification of binding through binding potentials (BPND) were measurably affected by CBF increases, which were larger than two-fold. Simulations of experimental procedures showed that even large changes in CBF should have little effect on the time activity curves of radiotracers, given a set of realistic assumptions. The proposed method can be applied to experimentally assess the flow sensitivity of other radiotracers. Results demonstrate that CBF changes, which often occur due to behavioral tasks or pharmacological challenges, do not affect PET [C-11]raclopride or [F-18]fallypride binding studies and their quantification. The results from this study suggest flow effects may have limited impact on many PET neuroreceptor tracers with similar properties.
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