Ultrasonic enhanced-contrast imager and method
View Patent ↗An ultrasonic enhanced-contrast imager and method includes an ultrasonic probe for transmitting and receiving an ultrasonic wave to and from an organism, a transmitting section for transmitting an ultrasonic signal to the ultrasonic probe, a receiving section for processing a response signal ultrasonic wave received by the ultrasonic probe, a filter for extracting a specific frequency component from the processed response signal, and a setting control section for setting a pass frequency band of the filter on the basis of a frequency band of the response signal from a contrast medium injected to the organism. A control section controls the operation of the filter in the set pass band, and the setting control section sets the center frequency of the pass band of the filter to be greater than f 0 and less than 2f 0 , where f 0 is the average frequency of the ultrasonic signal transmitted to the ultrasonic probe.
1. An ultrasonic enhanced-contrast imager comprising:
an ultrasonic probe for transmitting an ultrasonic wave to an organism and receiving an ultrasonic wave from the organism,
a transmitting section for transmitting an ultrasonic signal to the ultrasonic probe, and
a receiving section for processing a response signal ultrasonic wave received by said ultrasonic probe,
wherein said transmitting section includes means for transmitting an ultrasonic beam plural times at specific time intervals in the same direction, and means for constructing a continuous ultrasonic signal of each beam by the connection of waveforms of different frequencies and generating the ultrasonic signals of the beams inverted with respect to the time axis, and
wherein said receiving section phase-processes and adds together the response signals of those ultrasonic signals of each beam which are continuous.
2. An ultrasonic enhanced-contrast imager according to claim 1 , further comprising a filter having a pass band center frequency that is substantially 1.5f 0 .
3. The ultrasonic enhanced-contrast imager according to claim 2 , further comprising a setting control section which sets the pass band of said filter to be from 0.8f 0 to 2.5f 0 .
4. The ultrasonic enhanced-contrast imager according to claim 3 , wherein said setting control section sets the pass band of said filter to be from 0.8f 0 to 1.8f 0 .
5. The ultrasonic enhanced-contrast imager according to claim 3 , wherein said setting control section sets the pass band of said filter to be from 1.2f 0 to 1.8f 0 .
6. The ultrasonic enhanced-contrast imager according to claim 1 , wherein said transmitting section transmits said ultrasonic signal having plural frequency components to said ultrasonic probe, and the average frequency of the plural frequency components is the average frequency f 0 .
7. The ultrasonic enhanced-contrast imager according to claim 6 , wherein said ultrasonic signal has a continuous waveform formed by connecting waveforms of different frequencies.
8. An ultrasonic enhanced-contrast imaging method comprising:
transmitting an ultrasonic signal to an ultrasonic probe for transmitting an ultrasonic wave to an organism which is reflected from the organism back to the ultrasonic probe,
processing a response signal ultrasonic wave received by the ultrasonic probe,
transmitting an ultrasonic beam plural times at specific time intervals in the same direction as the ultrasonic wave,
constructing a continuous ultrasonic signal for each beam by connecting waveforms of different frequencies and generating the ultrasonic signals of the beams inverted with respect to a time axis, and
phase-processing and adding the response signals of those ultrasonic signals of each beam which are continuous.
9. The ultrasonic enhanced-contrast imaging method according to claim 8 , further comprising setting a center frequency of a pass band filter to be substantially 1.5f 0 .
10. The ultrasonic enhanced-contrast imaging method according to claim 8 , further comprising setting a pass band of a filter to be from 0.8f 0 to 2.5f 0 .
11. The ultrasonic enhanced-contrast imaging method according to claim 8 , further comprising setting a pass band of a filter to be from 0.8f 0 to 1.8f 0 .
12. The ultrasonic enhanced-contrast imaging method according to claim 8 , further comprising setting a pass band of a filter to be from 1.2f 0 to 1.8f 0 .
13. The ultrasonic enhanced-contrast imaging method according to claim 8 , wherein the ultrasonic signal transmitted to the ultrasonic probe in the transmitting process has plural frequency components, and the average frequency of the plural frequency components is the average frequency f 0 .
14. The ultrasonic enhanced-contrast imaging method according to claim 13 , wherein the ultrasonic signal has a waveform formed by connecting waveforms of different frequencies.