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11 Cards in this Set
- Front
- Back
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The circle of willis |
named for Thomas willis the circle consists of cerebral and communicating arteries that allow the brain to continue to receive blood flow even if a major supplying artery is stenosed/occluded it is essential to the performance of transcranial Doppler (TCD) studies |
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TCD Acoustic windows/cranial |
transtemporal transorbital transoccipital |
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TCD applications |
evaluation of vertebral-basilar symptoms assessment cerebral vasomotor response evaluation of response to revascularization monitoring vasospasm in subarachnoid hemorrhage loclization and characterization of intracranial stenosis
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TCD devices |
1- static TCD, also a flow mapping device 2MHz pulsed Doppler and frequency shifts
2- color Duplex TCD 2MHz phased array imaging with Doppler and spectral analysis
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Transtemporal Approach |
evaluate flow hemodynamics in the: Terminal ICA middle Cerebral Artery Anterior Cerebral Artery Posterior Cerebral Artery |
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anterior cerebral arteries middle cerebral arteries anterior communicating artery posterior cerebral arteries posterior communicating arteries basilar arteries |
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Anterior and posterior circulation
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internal carotid artery --> anterior cerebral artery middle cerebral artery posterior cerebral artery ophthalmic artery anterior communicating artery posterior communicating artery vertebral artery basilar artery |
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Contralateral hemisphere |
aorta LCCA LICA LACA ACoA RACA RMCA |
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ECA to ICA |
Aorta --> innominate --> RCCA RECA ECA branches (superficial temporal, facial, and maxiallary) ophthalmic artery branches (supraorbital, frontal, nasal) R ophthalmic artery distal ICA (Siphon) -->MCA |
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Internal carotid arteries parts |
ICA distal ICA (carotid siphon) ophthalmic artery Supraorbital artery |
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external carotid arteries parts |
superficial temporal internal mazillary posterior Auricular facial occipital lingual ascending pharyngeal superior thyroid |
