Techniques for measuring cerebral blood flow

Indirect

Carotid duplex scanning.

Transcranial Doppler to measure blood flow velocities in basal cerebral arteries.

Direct

Intermittent:

Inert gas inhalation (Fick principle): nitrous oxide, argon, krypton 85, xenon 133. This requires arterial and jugular venous bulb sampling. Single photon emission computed tomography. Intra-arterial injection of inert gas: Xenon 133. Stable xenon computed tomography. Positron emission tomography. Continuous:

Laser Doppler flowmetry. Thermal diffusion.

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