Title :
A real-time system for angle-independent velocity detection
Author :
Friemel, Barry H. ; Boho, L.N. ; Trahey, Gregg E.
Author_Institution :
Duke Univ., Durham, NC, USA
Abstract :
The first real-time angle-independent velocity detection system for ultrasound has been constructed. The system detects both the axial and lateral components of velocity using the sum absolute difference algorithm, a novel time-domain method for tracking speckle patterns. In addition to quantifying 2-D velocities, the system rejects echoes according to absolute brightness and vectors according to a best match criterion, filters the flow image and presents the information as a color map to the physician each 30-50 ms. Preliminary results are presented along with an introduction to the system architecture, a discussion of clinical applications and an outline of future directions for the project
Keywords :
biomedical measurement; biomedical ultrasonics; real-time systems; ultrasonic velocity measurement; 30 to 50 ms; absolute brightness; angle-independent velocity detection; axial component; best match criterion; clinical ultrasound; color map; flow image filtering; lateral component; physician; real-time system; speckle patterns tracking; sum absolute difference algorithm; system architecture; time-domain method; vectors; Brightness; Information filtering; Information filters; Kernel; Real time systems; Speckle; Time domain analysis; Ultrasonic imaging; Ultrasonic variables measurement; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234318
