Neonatal cerebral blood flow velocity I. An in vitro validation of the pulsed Doppler technique
| Autor: | Daniel P. Lindstrom, B. P. W. Lundell, Thomas G. Arnold |
|---|---|
| Rok vydání: | 1984 |
| Předmět: |
Quantitative Biology::Tissues and Organs
Physics::Medical Physics Pulsatile flow In Vitro Techniques Signal Models Biological Quantitative Biology::Cell Behavior In vitro model Physics::Fluid Dynamics symbols.namesake Medicine Humans Pulsed doppler business.industry Computers Infant Newborn General Medicine Anatomy Perfusion Transducer Flow (mathematics) Cerebral blood flow Cerebrovascular Circulation Pediatrics Perinatology and Child Health cardiovascular system symbols business Rheology Doppler effect Blood Flow Velocity Biomedical engineering |
| Zdroj: | Acta paediatrica Scandinavica. 73(6) |
| ISSN: | 0001-656X |
| Popis: | A combined pulsed and continuous Doppler instrument was used to assess flow velocities in an in vitro model designed to simulate small deeply lying arterial vessels. Diameters of the model vessels, depth under the transducers and the pulsatile flow patterns were chosen to simulate the corresponding conditions that can be expected when cerebral blood flow velocities are measured with this technique through the anterior fontanel in newborn infants. Computer analysis of the space average velocity signal from the pulsed Doppler mode, showed that the area under this curve, which corresponds to distance, was closely correlated to true flow over a wide range of flows in vessels of different diameters. This variable is suggested to be the closest estimate of true flow, when the diameter of the vessel under study cannot be accurately measured. |
| Databáze: | OpenAIRE |
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