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1. (WO2001033250) ULTRASONIC PULSE INVERSION HARMONIC SEPARATION WITH REDUCED MOTIONAL EFFECTS

Pub. No.:    WO/2001/033250    International Application No.:    PCT/EP2000/010098
Publication Date: Fri May 11 01:59:59 CEST 2001 International Filing Date: Fri Oct 13 01:59:59 CEST 2000
IPC: A61B 8/06
A61B 8/08
G01S 7/52
G01S 15/89
Applicants: KONINKLIJKE PHILIPS ELECTRONICS N.V.
Inventors: AVERKIOU, Michalakis
POWERS, Jeffry, E.
Title: ULTRASONIC PULSE INVERSION HARMONIC SEPARATION WITH REDUCED MOTIONAL EFFECTS
Abstract:
Pulse inversion harmonic separation is performed utilizing echoes from three or more pulses of alternating phase or polarity. Temporally different echoes of opposite phase or polarity are combined in pairs, which are in turn combined to form partial sums and a final sum in which fundamental frequency signal components are substantially eliminated. Preferably the signals are normalized to a common reference level. The inventive technique can be performed by a filter structure using weighting coefficients exhibiting a Gaussian variation.