Ultrasonic imaging device and ultrasonic signal processing device
The present invention aims to obtain and provide one or more types of information desired by an operator with a high efficiency. From a probe that transmits an ultrasonic wave to a subject and receives the ultrasonic wave coming from the subject due to the transmission, a reception signal is received and the reception signal is processed. Accordingly, a movement vector indicating a movement amount and a movement direction is calculated and a movement vector distribution is determined for a plurality of points set at least two-dimensionally in the subject. A distribution of one or more desired movement vector components is extracted from the movement vector distribution.
1. An ultrasonic imaging device, comprising:
a movement vector distribution calculation unit configured to receive a reception signal from a probe that transmits an ultrasonic wave to a subject and receives an ultrasonic wave coming from the subject due to the transmission, and process the reception signal, so as to calculate movement vectors each indicating a movement amount and a movement direction and determine a movement vector distribution for a plurality of points set at least two-dimensionally within a predetermined imaging range in the subject; and
a separation filter configured to extract a distribution of one or more desired movement vector components from the movement vector distribution;
wherein the separation filter is configured to extract a plurality of types of the distributions of movement vector components from the same movement vector distribution and cause a display unit to simultaneously display the plurality of types of the distributions.
2. The ultrasonic imaging device according to claim 1 , wherein
the separation filter is configured to extract a distribution of one or more movement vector components among a movement vector component indicating movement of one or more desired tissues among a plurality of tissues constituting the subject and a movement vector components indicating movement of the tissues of the subject due to one or more desired movement occurrence factors among a plurality of movement occurrence factors.
3. The ultrasonic imaging device according to claim 2 , wherein
the plurality of tissues include a blood flow and a tissue other than the blood flow, and
the separation filter is configured to extract, from the movement vector distribution, a distribution of either one of a blood flow vector and a movement vector of the tissue other than the blood flow as the movement vector component.
4. The ultrasonic imaging device according to claim 2 , wherein
the plurality of movement occurrence factors include a beat, a breathing, and an elastic wave propagating through the subject.
5. The ultrasonic imaging device according to claim 4 , wherein
the separation filter is configured to extract a distribution of one of the vector components that indicates the movement of the tissue due to the propagation of the elastic wave through the subject.
6. The ultrasonic imaging device according to claim 1 , wherein
the movement vector distribution calculation unit is configured to calculate the movement amounts by detecting a frequency shifted due to an Doppler effect of the reception signal.
7. The ultrasonic imaging device according to claim 6 , wherein
the movement vector distribution calculation unit is configured to determine the movement vectors by processing each of reception signals obtained by transmitting the ultrasonic wave to the subject from a plurality of directions, calculating movement amounts for each of the plurality of directions, and combining the calculated movement amounts for each of the plurality of directions.
8. The ultrasonic imaging device according to claim 7 , wherein
the separation filter is configured to generate an image of the subject based on the reception signals, and extract the movement vectors of the movement vector distribution at a corresponding position based on a luminance of the image.
9. The ultrasonic imaging device according to claim 1 , wherein
the movement vector distribution calculation unit is configured to calculate the movement vector distribution in a time series, and
the separation filter is configured to extract the movement vector component based on a temporal change of the movement vector.
10. The ultrasonic imaging device according to claim 9 , wherein
the separation filter is configured to extract the movement vector component using any one of a movement velocity indicated by the movement vector, a frequency and an eigenvalue of the temporal change of the movement amount indicated by the movement vector.
11. The ultrasonic imaging device according to claim 1 , wherein
the separation filter is configured to calculate predetermined evaluation indexes based on the extracted movement vector component distribution and cause a display device to display each of the evaluation indexes.
12. An ultrasonic signal processing device, comprising:
a movement vector distribution calculation unit configured to receive and process a reception signal from a probe that transmits an ultrasonic wave to a subject and receives the reception signal, so as to calculate movement vectors each indicating a movement amount and a movement direction and determine a movement vector distribution for a plurality of points set at least two-dimensionally within a predetermined imaging range in the subject;
a separation filter configured to extract a distribution of one or more desired movement vector components from the movement vector distribution; and
a data analysis unit configured to determine a reliability index of the one or more desired movement vector components and cause a display unit to display a spatial distribution of the reliability index.