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27 Cards in this Set
- Front
- Back
Window level for gray/white matter is
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WL 35, WW 100
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Bone window for the brain is
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WL 400, WW 3000
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Hemmorage/hematoma WW/WL
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WL 75, WW 150
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Acute ischemia WL/WW
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WL 35, WW25
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Non-contrast CT examinations of the brain are routinely indicated for
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Trauma to diagnose intracranial hemmorage or hematoma
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Other indications for a non-contrast CT of the brain include
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1.Congenital abnormalities
2. Hydrocephalus 3.Mass or tumor 4.Primary neoplasms of the brain 5.Metastatic lesions 6.Infecious fluid collections or absess 7.Boney abnormalities 8.Endocrinne pathology |
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Brain scans are aquired at
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An angle 15 degrees above the IOML, parallel to the skull base or done parallel to IOML.
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Orbit scans are aquired
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Parallel to IOML both axial and coronal.
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The algorithm used for orbits is
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Standard or soft tissue
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Soft tissue WL and WW for orbits is
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WL 40 and WW 400
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Bone WL and WW for orbits is
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WL 400 and WW 3000
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Sinus scan should be aquired with
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Axial images taken parallel to hard palate
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Aquisition should extend
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Inferiorly and anteriorly to include the maxiallary and ethmoid sinuses,superiorly to include the frontal sinus and posteriorly to include spheniod sinus,
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Soft tissues WL and WW for sinus
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WL 40 WW 400
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Bone WL and WW for sinus
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WL 400 WW 3000
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Reasons for use of contrast media in head imaging
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1. Neoplams
2. Imflammatory process 3. Vascular Abnormalities |
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Vascular components of the cirlce of Willis are
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1. Right and let anterior cerebral arteries
2.Anterior communicating artery 3.Right and left internal carotid arteries 4.Right and left cerebral arteries 5.Right and left posterior communication arteries |
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CTA of the brain is used to evaluate
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Cerebral aneurysm, intracranial thrombosis, traumatic cerebrovascular injury, arteriovenous malformation, and stenosis
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Cerebral perfusion refers to
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The level of blood flow throughout the brain tissue
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CT perfusion evaluates cerebral perfusion by
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Monitoring the initial passing of iodonated contrast media thru thevasculature of the brain
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Cerebral blood volume is
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The quanity of blood (in mL) contained within a 100-g volume of brain tissue. Normal range is 4 to 5 mL/100 g.
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Cerebral blood flow is
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The quanity of blood (mL) that moves through 100g of brain tissue each minute. Normal range in gray matter is 50 to 60 mL/100 g/min.
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Mean transit time (MTT) is
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The average transit time, in seconds, for blood to pass through a given region of the brain tissue. MTT varies between arterial inflow and venous outflow for a particular area.
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Central volume principle is
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CBF= CBV/MTT
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The promary goal of CTP is
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To identify and differentiate the infarct core and the penumbra.
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Brain tissue within the _______ is beyond repair by thrombolytic therapy.
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Infarct core
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The penumbra is
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The ischemic yet still viable tissue immediately surrounding the infarct core.
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