Ultrasonic diagnostic apparatus
First Claim
1. An ultrasonic diagnostic apparatus comprising:
- ultrasonic transmitting/receiving means for transmitting an ultrasonic wave into an object to be examined and receiving an ultrasonic echo of the transmitted ultrasonic wave;
detecting means for detecting a frequency shift component from an ultrasonic echo signal obtained by said ultrasonic transmitting/receiving means;
filter means for removing a clutter component from a detection signal obtained by said detecting means and extracting only a required Doppler shifted signal;
analyzing means for frequency analyzing the Doppler shifted signal output from said filter means to obtain predetermined Doppler data only when a power of the Doppler shifted signal exceeds a predetermined blank level;
setting means for setting system conditions influencing the noise level of the Doppler shifted signal; and
control means for substantially controlling the blank level of said analyzing means in accordance with the conditions set by said setting means.
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Accused Products
Abstract
An ultrasonic diagnostic apparatus includes an ultrasonic transmitting/receiving section for transmitting an ultrasonic wave into an object to be examined and receiving an ultrasonic echo of the transmitted ultrasonic wave, a detecting section for detecting a frequency shift component from an ultrasonic echo signal obtained by the ultrasonic transmitting/receiving section, a filter section for removing a clutter component from a detection signal obtained by the detecting section and extracting only a required Doppler shifted signal, an analyzing section for obtaining, by frequency analysis, Doppler data only from that component of the Doppler shifted signal which has power exceeding a predetermined blank level, a setting section for setting system conditions influencing the noise level of the Doppler shifted signal, and a control section for substantially controlling the blank level of the analyzing section in accordance with the conditions set by the setting section.
40 Citations
21 Claims
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1. An ultrasonic diagnostic apparatus comprising:
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ultrasonic transmitting/receiving means for transmitting an ultrasonic wave into an object to be examined and receiving an ultrasonic echo of the transmitted ultrasonic wave; detecting means for detecting a frequency shift component from an ultrasonic echo signal obtained by said ultrasonic transmitting/receiving means; filter means for removing a clutter component from a detection signal obtained by said detecting means and extracting only a required Doppler shifted signal; analyzing means for frequency analyzing the Doppler shifted signal output from said filter means to obtain predetermined Doppler data only when a power of the Doppler shifted signal exceeds a predetermined blank level; setting means for setting system conditions influencing the noise level of the Doppler shifted signal; and control means for substantially controlling the blank level of said analyzing means in accordance with the conditions set by said setting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An ultrasonic diagnostic apparatus comprising:
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ultrasonic transmitting/receiving means for transmitting an ultrasonic wave into an object to be examined and receiving an ultrasonic echo of the transmitted ultrasonic wave; detecting means for detecting a frequency shift component from an ultrasonic echo signal obtained by said ultrasonic transmitting/receiving means; filter means for removing a clutter component from a detection signal obtained by said detecting means and extracting only a required Doppler shifted signal; analyzing means for frequency analyzing the Doppler shifted signal output from said filter means to obtain predetermined Doppler data only when a power of the Doppler shifted signal exceeds a predetermined blank level; noise level detecting means for detecting a noise level of the Doppler shifted signal extracted by said filter means; and control means for substantially controlling a blank level of said analyzing means in according with the noise level detected by said noise level detecting means. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification