Dual-Energy CT and Spot Sign
نویسندگان
چکیده
منابع مشابه
Defining the CT angiography 'spot sign' in primary intracerebral hemorrhage.
PURPOSE The computed tomogram angiography (CTA) 'spot sign' describes foci of intralesional enhancement associated with hematoma expansion in primary intracerebral hemorrhage patients. A consistent radiological definition is required for two proposed recombinant Factor VIIa trials planning patient dichotomization according to 'spot sign' presence or absence. We propose radiological criteria for...
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BACKGROUND AND PURPOSE Standard (static) CT angiography is used to identify the intracerebral hemorrhage (ICH) spot sign. We used dynamic CT-angiography to describe spot sign characteristics and measurement parameters over 60-seconds of image acquisition. METHODS We prospectively identified consecutive patients presenting with acute ICH within 4.5 hours of symptom onset, and collected whole b...
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Image contrast in CT is mostly dependent on elements with high atomic weight, such as calcium, iron, and iodine The concentrations of these elements can be calculated from dual-energy x-ray data based on their characteristic attenuation patterns Dual-energy CT may can be helpful in neuroimaging to: Differentiate between hemorrhage and iodinated contrast agents in brain parenchyma Improve CT ang...
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BACKGROUND AND PURPOSE Recent studies have recommended both early and late imaging to increase spot sign detection. However optimal acquisition timing for spot detection and impact on outcome prediction is uncertain. Our aim was to assess the utility of CTP in spot sign detection and characterization with emphasis on its impact on the prediction of outcome in patients with acute primary ICH. ...
متن کاملNonuniqueness in dual-energy CT.
PURPOSE The goal is to determine whether dual-energy computed tomography (CT) leads to a unique reconstruction using two basis materials. METHODS The beam-hardening equation is simplified to the single-voxel case. The simplified equation is rewritten to show that the solution can be considered to be linear operations in a vector space followed by a measurement model which is the sum of the ex...
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ژورنال
عنوان ژورنال: American Journal of Neuroradiology
سال: 2016
ISSN: 0195-6108,1936-959X
DOI: 10.3174/ajnr.a4894