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Stewart, We tried to scan pt. for Temporal Arteritis and had Many patients with a positive biopsy and no temperal artery "halo", I am not sure if any one out there has any protocols other than obvious areas of narrowing within the Temporal artery ...we use our "entos" ATL scanhead. Also....the Temporal artery is extracranial....not necessarily near any temporal window...excess power would not be a problem unless you were using TCD power settings.