Abstract
Hybrid PET/MRI is being increasingly employed for quantitative cerebral perfusion imaging and assessment of cerebrovascular reactivity. Perfusion PET with diffusible tracers such as 15O-H2O is capable of precise cerebral blood flow (CBF) quantification and is the gold standard for the validation of protocols for other imaging-based techniques such as arterial spin labeling MRI. In hybrid acquisition, MRI aids in simplifying the PET protocol and improves the accuracy of autoradiographic or kinetic analysis by deriving parameters related to arterial input and tissue composition. Intravenous administration of acetazolamide and inducing hypercapnia using a breathing apparatus are the most common methods employed for modulating brain perfusion to measure cerebrovascular reactivity as a proxy of cerebrovascular reserve capacity, an important clinical marker in cerebrovascular diseases. Impaired vasodilatory response to these stimuli indicates areas that are at risk for ischemia. Simultaneous PET/MRI is essential for refining cerebrovascular reactivity MRI protocols and for assessing their applicability and limitations in various diseases and pathophysiologic scenarios prior to clinical deployment.
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Moradi, F., Fan, A.P. (2022). Perfusion PET and Cerebrovascular Reactivity with Acetazolamide Versus CO2 Challenge. In: Franceschi, A.M., Franceschi, D. (eds) Hybrid PET/MR Neuroimaging. Springer, Cham. https://doi.org/10.1007/978-3-030-82367-2_69
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