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Figure 1 | EJNMMI Research

Figure 1

From: Comparison of oxygen-15 PET and transcranial Doppler CO2-reactivity measurements in identifying haemodynamic compromise in patients with symptomatic occlusion of the internal carotid artery

Figure 1

Parametric images of cerebral blood flow and oxygen extraction fraction. Parametric images of cerebral blood flow (CBF) and oxygen extraction fraction (OEF) measured using PET in a 69-year-old man who presented with a minor ischaemic stroke in the left hemisphere with an occlusion of the left internal carotid artery. PET images show decreased CBF and increased OEF in the left hemisphere, indicating haemodynamic failure (stage 2). Using transcranial Doppler, CO2-reactivity of the left middle cerebral artery was measured as −12%.

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