Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1997-09-05
1999-04-06
Jaworski, Francis J.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
600455, A61B 806
Patent
active
058910360
ABSTRACT:
A Doppler ultrasound diagnostic apparatus equipped with Doppler detection units and a forward/reverse separating means in an audio signal output system, a complex Doppler signal control means which stores a complex Doppler signal received during the Doppler-mode period and reads out said complex Doppler signal during the B-mode period to use as a complex Doppler signal during the B-mode period, wherein said complex Doppler signal control means includes storage means for storing complex Doppler signals that are received during the Doppler-mode period; control means for reading out complex Doppler signals stored in said storage means in a reverse order during the B-mode period; complex frequency inversion means for inverting the frequency of the complex Doppler signals read by said control means in the reverse order from said storage means; and phase rotation correction means for correcting a difference in phase at a moment when the Doppler mode is connected to the B-mode for a complex Doppler signal from said complex frequency inversion means. This decreases deterioration in the quality of a Doppler sound.
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patent: 5220923 (1993-06-01), Hagiwara et al.
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patent: 5555514 (1996-09-01), Ri et al.
Hitachi Medical Corporation
Jaworski Francis J.
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