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Transcanial Doppler

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https://www.readbyqxmd.com/read/28269071/pre-clinical-investigations-of-multi-path-propagation-in-transcranial-doppler-ultrasound-flow-phantom
#1
Alexander J Weir, Cheng-Xiang Wang, Stuart Parks
There are various practical situations in medical applications when pre-clinical investigations must be performed using a simulation environment or test bench prior to human studies. One example is the analysis of propagation channels in Transcanial Doppler (TCD) ultrasound (US), a signal processing challenge requiring the analysis of data from US waves scattered in three dimensions (3D). When examining the effects of scatterers in such channels, it is common to use a data acquisition test bench and a Doppler flow phantom...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227290/pre-clinical-investigations-of-multi-path-propagation-in-transcranial-doppler-ultrasound-flow-phantom
#2
Alexander J Weir, Cheng-Xiang Wang, Stuart Parks, Alexander J Weir, Cheng-Xiang Wang, Stuart Parks, Alexander J Weir, Stuart Parks, Cheng-Xiang Wang
There are various practical situations in medical applications when pre-clinical investigations must be performed using a simulation environment or test bench prior to human studies. One example is the analysis of propagation channels in Transcanial Doppler (TCD) ultrasound (US), a signal processing challenge requiring the analysis of data from US waves scattered in three dimensions (3D). When examining the effects of scatterers in such channels, it is common to use a data acquisition test bench and a Doppler flow phantom...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/26969112/cognitive-tasks-and-cerebral-blood-flow-through-anterior-cerebral-arteries-a-study-via-functional-transcranial-doppler-ultrasound-recordings
#3
Héloïse Bleton, Subashan Perera, Ervin Sejdić
BACKGROUND: Functional transcanial Doppler ultrasound (fTCD) is a convenient approach to examine cerebral blood flow velocity (CBFV) in major cerebral arteries. METHODS: In this study, the anterior cerebral artery (ACA) was insonated on both sides, that is, right ACA (R-ACA) and left ACA (L-ACA). The envelope signals (the maximum velocity) and the raw signals were analyzed during cognitive processes, i.e. word-generation tasks, geometric tasks and resting state periods separating each task...
March 12, 2016: BMC Medical Imaging
https://www.readbyqxmd.com/read/18641872/transcranial-doppler-in-sickle-cell-anaemia-evaluation-of-brain-blood-flow-parameters-in-children-of-aracaju-northeast-brazil
#4
Hyder Aragão de Melo, José Augusto S Barreto-Filho, Roberto César P do Prado, Rosana Cipolotti
BACKGROUND: Environmental factors interfere on sickle cell anaemia (SCA). Transcanial Doppler (TCD) is important to evaluate cerebrovascular disease. OBJECTIVE: To evaluate brain haemodynamic profile of children with SCA in Sergipe. METHODS: Cross sectional study (group1: SCA patients aged 3-18; group2: age and sex matched healthy individuals). Baseline brain flow was evaluated. RESULTS: Group1=34 patients; group 2=81 controls...
June 2008: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/12568170/transcranial-doppler-monitoring-compared-with-invasive-monitoring-of-intracranial-pressure-during-acute-intracranial-hypertension
#5
COMPARATIVE STUDY
A Sidi, G Messinger, M E Mahla
OBJECTIVE: To determine whether a simple transcanial Doppler waveform variable-pulsatility difference (systolic - diastolic blood flow velocity) can serve as a measure of critical changes in cerebral perfusion. METHODS: Thirteen pigs were anesthetized (anesthesia maintained with halothane) and ventilated to maintain normoxia and normocarbia. To measure mean arterial pressure, hemoglobin, and blood gases, the right carotid artery was cannulated. The right intracranial lateral ventricle was cannulated to measure and increase intracranial pressure; the right internal jugular vein was cannulated in 8 of 13 pigs to measure jugular venous oxygen saturation and to calculate cerebral arteriovenous oxygen content difference...
May 1999: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/12214607/-effects-of-rotating-table-simulated-push-pull-maneuver-on-cerebral-circulation-function
#6
W X Zhang, C L Zhan, X C Geng, G D Yan, X Lu, X Chu
OBJECTIVE: To investigate the change and regulation of cerebral circulation during rotating-table simulated push-pull maneuver. METHOD: A special rotating-table was used to simulate the push-pull maneuver. 10 healthy adults were subjected to a series of "head-up stand (+1Gz) 1 min head-down stand (-1Gz) 10 s and head-up stand (+1Gz) 1 min" changes. Cerebral blood flow velocity and pulsatility indices in the left middle cerebral artery were constantly measured with a TC2020TCD using Transcranial Doppler [correction of Transcanial Dopplor] instrument...
February 2000: Hang Tian Yi Xue Yu Yi Xue Gong Cheng, Space Medicine & Medical Engineering
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