Ultrasonic diagnosis apparatus

1. An ultrasound diagnosis apparatus, comprising:

an ultrasound transceiver configured to

change a transmission direction of ultrasound waves, and

transmit the ultrasound waves continuously or repeatedly at predetermined intervals, the ultrasound waves being transmitted in a direction set while the ultrasound transceiver is inserted and placed in an esophagus of a subject to acquire biological information including a Doppler signal indicating blood flow information of an observation site of the subject, the observation site being heart of the subject; and

a controller configured to

obtain a direction toward the observation site based on a signal strength of the Doppler signal or a measured waveform pattern of the Doppler signal, and

control, based on the obtained direction, the ultrasound transceiver being inserted and placed in the esophagus to adjust the transmission direction of ultrasound waves to be the obtained direction.

2. The ultrasound diagnosis apparatus according to claim 1 , further comprising a display unit configured to display the condition of the observation site based on the biological information.

3. The ultrasound diagnosis apparatus according to claim 1 , wherein

the controller is configured to control the ultrasound transceiver to sequentially change the transmission direction of ultrasound waves, and obtain a transmission direction in which signal strength of the Doppler signal is highest as the direction toward the observation site.

4. The ultrasound diagnosis apparatus according to claim 3 , wherein the controller is configured to obtain the transmission direction in which the signal strength of the Doppler signal is highest as the direction toward the observation site at predetermined time intervals.

5. The ultrasound diagnosis apparatus according to claim 3 , wherein the controller is configured to obtain the transmission direction in which the signal strength of the Doppler signal is highest as the direction toward the observation site when the signal strength of the Doppler signal obtained by the ultrasound transceiver is below a threshold stored in advance.

6. The ultrasound diagnosis apparatus according to claim 1 , further comprising processing circuitry configured to generate first waveform patterns based on Doppler signals indicating blood flow information of the subject obtained by the ultrasound transceiver as the biological information, wherein

the controller is configured to control the ultrasound transceiver to change the transmission direction of ultrasound waves, and, from the first waveform patterns each generated for a transmission direction, obtain a similar waveform pattern which is most similar to a second waveform pattern stored in advance, and obtain the transmission direction for which the similar waveform pattern is generated as the direction toward the observation site.

7. The ultrasound diagnosis apparatus according to claim 6 , wherein the controller is configured to obtain the similar waveform pattern at predetermined time intervals.

8. The ultrasound diagnosis apparatus according to claim 6 , wherein

the processing circuitry is configured to generate a third waveform pattern based on a Doppler signal in a predetermined transmission direction, and

the controller is configured to obtain similarity between the third waveform pattern and the second waveform pattern, and start a process to obtain the similar waveform pattern when the similarity is below a threshold stored in advance.

9. The ultrasound diagnosis apparatus according to claim 3 , wherein

the direction in which the ultrasound transceiver transmits ultrasound waves is set to direction of left ventricle of the subject, and

the ultrasound transceiver is configured to obtain a Doppler signal from the left ventricle as the biological information.

10. The ultrasound diagnosis apparatus according to claim 2 , wherein the controller is configured to sequentially receive an electrocardiogram waveform of the subject and obtain predetermined cardiac time phase, and control the ultrasound transceiver to transmit ultrasound waves to obtain the Doppler signal based on the cardiac time phase.

11. The ultrasound diagnosis apparatus according to claim 10 , wherein the predetermined cardiac time phase is diastole.

12. The ultrasound diagnosis apparatus according to claim 3 , wherein

the ultrasound transceiver is configured to be included in a capsule container, and

the capsule container further includes an interface configured to transmit and receive signals between the capsule container and a main body, and a power supply line configured to supply power to the ultrasound transceiver.

13. The ultrasound diagnosis apparatus according to claim 6 , wherein the second waveform pattern is generated based on the biological information acquired under a predetermined acquisition condition determined in advance, and stored.

14. The ultrasound diagnosis apparatus according to claim 2 , wherein

the biological information includes a Doppler signal indicating blood flow information of the subject, and

the controller is configured to obtain a position of the observation site based on the Doppler signal sequentially obtained.

15. The ultrasound diagnosis apparatus according to claim 1 , wherein the biological information includes at least one of heart chamber volume, cardiac ejection fraction, and blood flow information of the observation site.

16. The ultrasound diagnosis apparatus according to claim 12 , wherein

the main body includes:

a power supply connected to the power supply line; and

a signal processor connected to the controller and the interface, and configured to perform signal processing on signals received from the ultrasound transceiver, and

the capsule container is configured to be connected to the main body by the interface.

17. The ultrasound diagnosis apparatus according to claim 6 , wherein

the ultrasound transceiver is configured to be included in a capsule container, and

the capsule container further includes an interface configured to transmit and receive signals between the capsule container and a main body, and a power supply line configured to supply power to the ultrasound transceiver.

18. An ultrasound diagnosis apparatus, comprising:

an ultrasound transceiver configured to update a transmission direction of ultrasound waves to follow an observation site inside of a subject, thereby correcting the transmission direction to compensate for a shift of a position of the ultrasound transceiver shifts relative to a position of the observation site, the ultrasound transceiver performing the update of the transmission direction by

transmitting the ultrasound waves in the transmission direction of the observation site, the ultrasound waves being transmitted continuously or repeatedly at predetermined intervals, and

changing the transmission direction of the ultrasound waves while the ultrasound transceiver is inserted and placed in an esophagus of the subject to acquire biological information including a Doppler signal indicating blood flow information of the observation site inside of the subject, the observation site being heart of the subject; and

a controller configured to

determine, based on either (i) a signal strength of the Doppler signal or (ii) a waveform pattern of the Doppler signal, a direction from ultrasound transceiver to the observation site, and

control the ultrasound transceiver that is inserted and placed in the esophagus to update the transmission direction to the determined direction from ultrasound transceiver to the observation site.