| Autor: |
K. Whittaker Ferrara, A. Kalisz, Bernhard G. Zagar, V.R. Algazi |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
Proceedings of IEEE Ultrasonics Symposium ULTSYM-94. |
| DOI: |
10.1109/ultsym.1994.401916 |
| Popis: |
In order to explore the feasibility of algorithms to determine the three dimensional (3D) velocity magnitude from the received ultrasonic blood echo from a single line of sight, the signal from small sample volumes is studied as a function of beam-vessel angle. As opposed to previous treatments of the effect of the beam-vessel angle on the received acoustic signal, a wideband signal is transmitted and the returned signal in each sample volume is analyzed. It is shown that the two major effects limiting the correlated signal interval are the spread of axial velocities within the sample volume and the transit time across the lateral beam width. Particularly for small beam-vessel angles, the spread of velocities limits the correlated signal interval |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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