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27 Cards in this Set

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Window level for gray/white matter is
WL 35, WW 100
Bone window for the brain is
WL 400, WW 3000
Hemmorage/hematoma WW/WL
WL 75, WW 150
Acute ischemia WL/WW
WL 35, WW25
Non-contrast CT examinations of the brain are routinely indicated for
Trauma to diagnose intracranial hemmorage or hematoma
Other indications for a non-contrast CT of the brain include
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
Brain scans are aquired at
An angle 15 degrees above the IOML, parallel to the skull base or done parallel to IOML.
Orbit scans are aquired
Parallel to IOML both axial and coronal.
The algorithm used for orbits is
Standard or soft tissue
Soft tissue WL and WW for orbits is
WL 40 and WW 400
Bone WL and WW for orbits is
WL 400 and WW 3000
Sinus scan should be aquired with
Axial images taken parallel to hard palate
Aquisition should extend
Inferiorly and anteriorly to include the maxiallary and ethmoid sinuses,superiorly to include the frontal sinus and posteriorly to include spheniod sinus,
Soft tissues WL and WW for sinus
WL 40 WW 400
Bone WL and WW for sinus
WL 400 WW 3000
Reasons for use of contrast media in head imaging
1. Neoplams
2. Imflammatory process
3. Vascular Abnormalities
Vascular components of the cirlce of Willis are
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
CTA of the brain is used to evaluate
Cerebral aneurysm, intracranial thrombosis, traumatic cerebrovascular injury, arteriovenous malformation, and stenosis
Cerebral perfusion refers to
The level of blood flow throughout the brain tissue
CT perfusion evaluates cerebral perfusion by
Monitoring the initial passing of iodonated contrast media thru thevasculature of the brain
Cerebral blood volume is
The quanity of blood (in mL) contained within a 100-g volume of brain tissue. Normal range is 4 to 5 mL/100 g.
Cerebral blood flow is
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.
Mean transit time (MTT) is
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.
Central volume principle is
CBF= CBV/MTT
The promary goal of CTP is
To identify and differentiate the infarct core and the penumbra.
Brain tissue within the _______ is beyond repair by thrombolytic therapy.
Infarct core
The penumbra is
The ischemic yet still viable tissue immediately surrounding the infarct core.