Surgery – Truss – Pad
Patent
1991-06-07
1993-07-13
Jaworski, Francis
Surgery
Truss
Pad
A61B 806
Patent
active
052264203
ABSTRACT:
An ultrasonic color flow information processing system receives ultrasonic Doppler information signals which are used to develop a map of color flow display information of fluid flow. The system processes the Doppler information through autoregressive spectral estimation, which models the Doppler information as the output of an all-pole filter driven by white noise. For real-time utilization, the estimation of poles of the filter model is restricted to the estimation of two poles, one representative of tissue and one representative of fluid flow. The two poles and the white noise power parameter of the model are analyzed in accordance with certain criteria to select for display one of the poles as that representative of fluid flow.
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Ahn, Y. B. et al "Estimation of Mean Frequency & Variance of UTS Doppler Signal by Using Second Order Autoregressive Model", IEEE Trans. on Ultrasonics, Ferroelectrics, & Freq. Control, vol. 38, No. 3, May 1991, pp. 172-181.
Loupas, T. et al, "Low-Order Complex AR Models for Mean and Max. Frequency Estimation in the Context of Doppler Color Flow Mapping", IEEE Trans. on UFFC, vol. 37, No. 6, Nov. 1990, pp. 590-601.
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Advanced Technology Laboratories, Inc.
Brinton Yorks, Jr. W.
Jaworski Francis
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