2328745-A is referenced by 15 patents and cites 1 patents.

Quadrature demodulation apparatus and method for detecting a contrast agent in an ultrasonic echographic system, including an in phase/quadrature demodulator 56 for determining the resolved complex real and imaginary in phase and quadrature components of return signals and a contrast agent detector 62 determining the complex difference between first and second return signals. The detector 62 is implemented as a magnitude of difference detector (72,76,78,84, Fig.2) determining the magnitude of the complex difference of pairs of first and second return signals wherein the real and imaginary components of the return signals, including magnitude and phase information, are used to determine the magnitude of the complex difference between first and second return signals.; The detector is also implemented as a asymmetrical weighting detector (72,76,92a,92b,96,84,98, Fig.3) resolving the complex difference between first and second return signals into components in phase with and orthogonal to the second signal and weighting the magnitudes of in phase and orthogonal components of the complex difference and indicating a contrast agent present when the combination of differently weighted component exceeds the corresponding threshold value.; The detector is also implemented as an extrapolation detector (72a,72b,100/108a/108b,102,104,106,84, Fig.4) for receiving a first return signal and n subsequent successive return signals along each line wherein then n subsequent return signals are used to extrapolate what the first return signal would have been without the contrast agent component and to generate a decision threshold that is compared to the complex difference between the actual first return signal and the extrapolated first return signal.

Title
Ultrasonic echographic system
Application Number
GB19980017815 19980814
Publication Number
2328745 (A)
Application Date
August 14, 1998
Publication Date
March 3, 1999
Inventor
Rafter Patrick G
Clark David W
Assignee
Hewlett Packard Co
US
IPC
A61B 08/00
G01S 07/52
A61B 08/00
A61B 08/14
G01S 07/52
A61B 08/00
A61B 08/14
View Original Source Download PDF