Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"transcranial Doppler ultrasound"”.
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Channel characterisation and modelling for transcranial Doppler ultrasound.
… signals (MES) is a mature application of transcranial Doppler (TCD) ultrasound. It involves the identification of abnormally highpitched signals within the arterial waveform as a method of diagnosis and prediction of embolic complications in stroke patients. More recently, algorithms have …
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An electronically steered, wearable transcranial doppler ultrasound system
This thesis details the design of a transcranial Doppler (TCD) ultrasound system to measure cerebral blood flow velocity (CBFV) at the middle cerebral artery (MCA). TCD sonography has been clinically indicated in a variety of neurovascular diagnostic applications. Acceptance of conventional TCD …
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A wearable Transcranial Doppler ultrasound phased array system
Transcranial Doppler (TCD) sonography is a specialized ultrasound technique that enables measurement of blood ow velocity from the basal intracerebral vessels. Use of TCD sonography is highly compelling as a diagnostic modality due to its safety in prolonged studies, high temporal resolution, and …
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Do abnormalities in dynamic cerebral auto-regulation underlie the pathophysiological processes behind syncope in older people?
… PPH study maximum 60 minutes per visit). All had Transcranial Doppler ultrasound, beat-to-beat BP, ECG and CO2 monitoring. Baseline autonomic function, arterial stiffness, cardiac baroreceptor sensitivity (BRS) were calculated and dynamic cerebral auto-regulation (as the autoregulatory index ARI) …
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Cerebral Hemodynamics in High-Risk Neonates Probed by Diffuse Optical Spectroscopies
… in the middle cerebral artery acquired by transcranial Doppler ultrasound. In patients with congenital heart defects DCS-measured relative changes in CBF due to hypercapnia agree strongly with relative changes in blood flow in the jugular veins as measured by phase-encoded velocity mapping …
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Impact of Hydroxyurea on Neurocognitive Function and Quality of Life in Children with Sickle Cell Anemia
… recognized. Early screening for stroke risk with Transcranial Doppler ultrasound (TCD) and initiation of monthly red blood cell transfusions in children with SCA and abnormal TCD velocities has been proven to substantially decrease the risk of overt stroke; however, chronic transfusion is …
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Clinical Applications of Neuromonitoring Following Acute Brain Injury
… (ICP), arterial blood pressure (ABP), and transcranial Doppler ultrasonography (TCD) recordings. Data analysis focused on ICP microsensor accuracy, compensatory reserve, the pulsatility of brain signals (ICP and TCD), and cerebral arterial blood volume (CaBV) based on TCD. The main results …
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Effects of Tea on Peripheral and Cerebral Micro- and Macrovascular Function in Humans
… four sites on the dominant forearm using laser Doppler flowmetry (LDF). The following heating protocols were adopted: 1. Rapid 39°C (0.5°C/5-s), 2. Rapid 42°C (0.5°C/5-s) 3. Gradual 42°C (0.5°C/2-min 30-s) and 4. Slow 42°C (0.5°C/5-min). The coefficient of variation (CV) was calculated for …
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The influence of acute, chronic and lifelong hypoxia on the functional and structural integrity of the neurovascular unit
… viscosity (<i>Study 2 </i>only). Duplex and transcranial Doppler ultrasonography were employed to measure extracranial (internal carotid artery blood flow [ICA<sub>Q</sub>] and vertebral artery blood flow [VA<sub>Q</sub>]) and intracranial (middle cerebral artery blood velocity …