Abstract
In order to develop a three dimensional (3D) color flow map of low velocity flow through small vessels, we explore the use of a high resolution velocity estimation technique and a new technique for the differentiation of regions of flow and stationary tissue. Following the transmission of a wideband signal, a signal processing strategy that tracks the motion of small regions of blood is used to estimate velocity. We find that the use of wideband transmission, with coherent estimation over a long pulse train, provides the opportunity to map very low velocity flow, and to detect flow at beam-vessel angles near 90°. The use of 3D continuity processing to differentiate flow and stationary tissue is shown to improve noise immunity. In-vitro and in-vivo velocity maps are presented. The 3D velocity profile is then constructed.
Original language | English (US) |
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Pages (from-to) | 293-304 |
Number of pages | 12 |
Journal | Ultrasound in Medicine and Biology |
Volume | 22 |
Issue number | 3 |
DOIs | |
State | Published - 1996 |
Externally published | Yes |
Keywords
- Blood flow
- Color flow mapping
- Doppler
- Three dimensional ultrasound
- Wall filter
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging