Ultrasonic diagnostic apparatus and control method thereof

Abstract

To provide an ultrasonic diagnostic apparatus and a control method of the ultrasonic diagnostic apparatus that allow a user to execute an examination for a subject smoothly while using a plurality of ultrasonic probes simultaneously.SOLUTION: An ultrasonic diagnostic apparatus includes a plurality of ultrasonic probes (1 and 3) having a communication circuit for transmitting a synchronization signal which are operated by a time sequence including an ultrasonic wave transmission / reception period for executing transmission / reception of an ultrasonic wave, a standby period for stopping transmission / reception of an ultrasonic wave, and a synchronization period for synchronization with each other. When one of the ultrasonic probes (1 and 3) is in the ultrasonic wave transmission / reception period, the other of the ultrasonic probes (1 and 3) is brought into the standby period. When one of the ultrasonic probes (1 and 3) is in the synchronization period, the other of the ultrasonic probes (1 and 3) is brought into the synchronization period as well. If the synchronization fails, the synchronization period is extended and when the synchronization becomes valid, either of the ultrasonic probes (1 and 3) is brought into the ultrasonic wave transmission / reception period.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an ultrasonic diagnostic apparatus including a plurality of ultrasonic probes and a control method for the ultrasonic diagnostic apparatus.

Background Art

[0002] Conventionally, examinations of a plurality of sites of a subject have been performed simultaneously using a plurality of ultrasonic probes. At this time, if ultrasonic waves are simultaneously transmitted from the plurality of ultrasonic probes to the subject, it is known that the ultrasonic waves transmitted from the plurality of ultrasonic probes interfere with each other, and the image quality of the acquired ultrasonic image deteriorates. Therefore, in order to prevent deterioration of the image quality due to interference of ultrasonic waves, for example, as disclosed in Patent Document 1, an ultrasonic diagnostic apparatus has been developed that synchronizes between a plurality of ultrasonic probes and sequentially transmits ultrasonic waves from the plurality of ultrasonic probes to the subject.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the synchronization between a plurality of ultrasonic probes may fail for some reason. In this case, ultrasonic waves may not be transmitted to the subject in order from the ultrasonic probe in which the synchronization has failed, and there may be a case where the user cannot smoothly perform an examination on the subject while observing the ultrasonic image.

[0005] The present invention has been made to solve such conventional problems, and an object thereof is to provide an ultrasonic diagnostic apparatus and a control method for the ultrasonic diagnostic apparatus that enable a user to smoothly perform an examination on a subject while simultaneously using a plurality of ultrasonic probes.

Means for Solving the Problem

[0006] To achieve the above object, the ultrasonic diagnostic apparatus according to the present invention includes a plurality of ultrasonic probes that respectively transmit and receive ultrasonic waves. The plurality of ultrasonic probes have a communication circuit that notifies an operating state related to the transmission and reception of ultrasonic waves by transmitting a synchronization signal to each other. The plurality of ultrasonic probes each operate according to a time sequence including at least an ultrasonic transmission / reception period for transmitting and receiving ultrasonic waves, a standby period for stopping the transmission and reception of ultrasonic waves, and a synchronization period for synchronizing with each other. When any one of the plurality of ultrasonic probes is in the ultrasonic transmission / reception period, the other ultrasonic probes are in the standby period. When any one of the plurality of ultrasonic probes is in the synchronization period, the other ultrasonic probes are also in the synchronization period. When the plurality of ultrasonic probes fail to synchronize with each other during the synchronization period, the synchronization period is extended, and after they can synchronize with each other, any one of the ultrasonic probes enters the ultrasonic transmission / reception period. This is a characteristic feature.

[0007] The ultrasonic diagnostic apparatus includes an input device for the user to perform an input operation. When the synchronization period is extended, the synchronization period can return to the length before the extension only when the user operates via the input device.

[0008] One of the plurality of ultrasonic probes operates as a main probe, and the remaining ultrasonic probes operate as slave probes. The main probe can have a synchronization period extension unit that extends the synchronization period when it cannot detect, via the communication circuit, the synchronization signal transmitted from the slave probe during the synchronization period. The synchronization period extension unit can automatically extend the synchronization period when it cannot detect, via the communication circuit, the synchronization signal transmitted from the slave probe during the synchronization period. Also, the synchronization period extension unit can extend the synchronization period based on an input operation via the input device by the user.

[0009] The maximum value of the extension of the synchronization period can be determined. The synchronization period can be extended step by step.

[0010] The ultrasonic diagnostic apparatus includes a plurality of apparatus main bodies corresponding to a plurality of ultrasonic probes and respectively connected to the plurality of ultrasonic probes. The plurality of ultrasonic probes can each acquire image data by transmitting and receiving ultrasonic waves during the ultrasonic transmission / reception period and transmit the image data to the corresponding apparatus main body. The plurality of ultrasonic probes can wirelessly transmit a synchronization signal to other ultrasonic probes, and the plurality of ultrasonic probes can each transmit the image data to the corresponding apparatus main body by wire. The plurality of ultrasonic probes can transmit a synchronization signal to other ultrasonic probes by a first wireless method, and the plurality of ultrasonic probes can also each transmit the image data to the corresponding apparatus main body by a second wireless method.

[0011] The plurality of ultrasonic probes can transmit a synchronization signal to each other via the plurality of apparatus main bodies. The ultrasonic diagnostic apparatus includes one display device connected to the plurality of apparatus main bodies, and a plurality of ultrasonic images can be simultaneously displayed on the display device based on the plurality of image data transmitted from the plurality of ultrasonic probes to the plurality of apparatus main bodies. At least one of the plurality of apparatus main bodies can generate a three-dimensional ultrasonic image based on the image data respectively transmitted from the plurality of ultrasonic probes, and the three-dimensional ultrasonic image can be displayed on the display device.

[0012] Each of the plurality of ultrasonic probes can include a transducer array, a transmission / reception circuit that transmits ultrasonic waves from the transducer array and generates a beam signal based on the reception signal acquired by the transducer array, and an image data generation unit that generates image data based on the beam signal generated by the transmission / reception circuit.

[0013] The control method of an ultrasonic diagnostic apparatus according to the present invention is a control method of an ultrasonic diagnostic apparatus including a plurality of ultrasonic probes that respectively transmit and receive ultrasonic waves. The plurality of ultrasonic probes notify an operating state related to the transmission and reception of ultrasonic waves by transmitting a synchronization signal to each other. The plurality of ultrasonic probes each operate according to a time sequence including at least an ultrasonic transmission / reception period for transmitting and receiving ultrasonic waves, a standby period for stopping the transmission and reception of ultrasonic waves, and a synchronization period for synchronizing with each other. When any one of the plurality of ultrasonic probes is in the ultrasonic transmission / reception period, the other ultrasonic probes are in the standby period. When any one of the plurality of ultrasonic probes is in the synchronization period, the other ultrasonic probes are also in the synchronization period. The plurality of ultrasonic probes extend the synchronization period when synchronization fails between them during the synchronization period, and after they reach a state where they can synchronize with each other, any one of the ultrasonic probes enters the ultrasonic transmission / reception period.

Effect of the Invention

[0014] According to the present invention, an ultrasonic diagnostic apparatus includes a plurality of ultrasonic probes that respectively transmit and receive ultrasonic waves. The plurality of ultrasonic probes have a communication circuit that notifies an operating state related to the transmission and reception of ultrasonic waves by transmitting a synchronization signal to each other. The plurality of ultrasonic probes each operate according to a time sequence including at least an ultrasonic transmission / reception period for transmitting and receiving ultrasonic waves, a standby period for stopping the transmission and reception of ultrasonic waves, and a synchronization period for synchronizing with each other. When any one of the plurality of ultrasonic probes is in the ultrasonic transmission / reception period, the other ultrasonic probes are in the standby period. When any one of the plurality of ultrasonic probes is in the synchronization period, the other ultrasonic probes are also in the synchronization period. The plurality of ultrasonic probes extend the synchronization period when synchronization fails between them during the synchronization period, and after they reach a state where they can synchronize with each other, any one of the ultrasonic probes enters the ultrasonic transmission / reception period. Therefore, while using a plurality of ultrasonic probes simultaneously, a user can smoothly perform an examination on a subject.

Brief Description of the Drawings

[0015]

Figure 1

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Figure 11

Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The description of the constituent elements given below is based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. In this specification, a numerical range represented using "~" means a range including the numerical values described before and after "~" as the lower limit value and the upper limit value. In this specification, "identical" and "the same" are assumed to include an error range generally acceptable in the technical field.

[0017] Embodiment 1 FIG. 1 shows the configuration of an ultrasonic diagnostic apparatus according to Embodiment 1 of the present invention. The ultrasonic diagnostic apparatus includes two ultrasonic probes, a main probe 1 and a sub-probe 3, an apparatus main body 2 connected to the main probe 1, and an apparatus main body 4 connected to the sub-probe 3. The ultrasonic diagnostic apparatus is used, for example, to perform ultrasonic examinations of two sites on the same subject simultaneously.

[0018] The main probe 1 includes a transducer array 11, and a transmission / reception circuit 12 and an image data generation unit 13 are sequentially connected to the transducer array 11. The main probe 1 also includes a communication circuit 14 and a synchronization period extension unit 15. A probe control unit 16 is connected to the transmission / reception circuit 12, the image data generation unit 13, the communication circuit 14, and the synchronization period extension unit 15. Further, a processor 17 for the main probe 1 is configured by the transmission / reception circuit 12, the image data generation unit 13, the synchronization period extension unit 15, and the probe control unit 16.

[0019] The apparatus main body 2 connected to the main probe 1 includes an image processing unit 21 connected to the image data generation unit 13 of the main probe 1. A display control unit 22 and a monitor 23 are sequentially connected to the image processing unit 21. A main body control unit 24 is connected to the image processing unit 21 and the display control unit 22. The main body control unit 24 is connected to the probe control unit 16 of the main probe 1. An input device 25 is connected to the main body control unit 24. Further, a processor 26 for the apparatus main body 2 is configured by the image processing unit 21, the display control unit 22, and the main body control unit 24.

[0020] The slave probe 3 includes a vibrator array 31, to which a transmission / reception circuit 32 and an image data generation unit 33 are sequentially connected. The slave probe 3 also includes a communication circuit 34 that communicates with the communication circuit 14 of the master probe 1. A probe control unit 36 is connected to the transmission / reception circuit 32, the image data generation unit 33, and the communication circuit 34. Also, a processor 37 for the slave probe 3 is constituted by the transmission / reception circuit 32, the image data generation unit 33, and the probe control unit 36.

[0021] The apparatus main body 4 connected to the slave probe 3 includes an image processing unit 41 connected to the image data generation unit 33 of the slave probe 3. A display control unit 42 and a monitor 43 are sequentially connected to the image processing unit 41. A main body control unit 44 is connected to the image processing unit 41 and the display control unit 42. The main body control unit 44 is connected to the probe control unit 36 of the slave probe 3. An input device 45 is connected to the main body control unit 44. Also, a processor 46 for the apparatus main body 4 is constituted by the image processing unit 41, the display control unit 42, and the main body control unit 44.

[0022] The vibrator array 11 of the master probe 1 has a plurality of ultrasonic vibrators arranged in one dimension or two dimensions. These ultrasonic vibrators transmit ultrasonic waves according to drive signals supplied from the transmission / reception circuit 12, receive ultrasonic echoes from the subject, and output signals based on the ultrasonic echoes. Each ultrasonic vibrator is configured, for example, by forming electrodes at both ends of a piezoelectric body made of a piezoelectric ceramic typified by PZT (Lead Zirconate Titanate), a polymer piezoelectric element typified by PVDF (Poly Vinylidene Di Fluoride), a piezoelectric single crystal typified by PMN-PT (Lead Magnesium Niobate-Lead Titanate solid solution), or the like.

[0023] The transmission / reception circuit 12 generates a beam signal under the control of the probe control unit 16 by transmitting ultrasonic waves from the transducer array 11 and based on the reception signal acquired by the transducer array 11. As shown in FIG. 2, the transmission / reception circuit 12 includes a pulsar 51 connected to the transducer array 11, an amplification unit 52, an AD (Analog to Digital) conversion unit 53, and a beamformer 54 that are sequentially connected in series from the transducer array 11.

[0024] The pulsar 51 includes, for example, a plurality of pulse generators, and supplies drive signals to the plurality of ultrasonic transducers of the transducer array 11 while adjusting the delay amount so that the ultrasonic waves transmitted from the plurality of ultrasonic transducers of the transducer array 11 form an ultrasonic beam based on the transmission delay pattern selected according to the control signal from the probe control unit 16. In this way, when a pulsed or continuous-wave voltage is applied to the electrodes of the ultrasonic transducers of the transducer array 11, the piezoelectric body expands and contracts, and pulsed or continuous-wave ultrasonic waves are generated from each of the ultrasonic transducers, and an ultrasonic beam is formed from the combined wave of these ultrasonic waves.

[0025] The transmitted ultrasonic beam is reflected, for example, by an object such as a part of a subject and propagates toward the transducer array 11 of the main probe 1. The ultrasonic echo propagating toward the transducer array 11 in this way is received by each of the ultrasonic transducers constituting the transducer array 11. At this time, each of the ultrasonic transducers constituting the transducer array 11 expands and contracts by receiving the propagating ultrasonic echo, generates a reception signal that is an electrical signal, and outputs these reception signals to the amplification unit 52.

[0026] The amplifier unit 52 amplifies the signals input from the respective ultrasonic transducers that make up the transducer array 11, and transmits the amplified signals to the AD conversion unit 53. The AD conversion unit 53 converts the signals transmitted from the amplifier unit 52 into digital reception data. The beamformer 54 performs so-called reception focusing processing by applying respective delays to and adding the respective reception data received from the AD conversion unit 53. By this reception focusing processing, the respective reception data converted by the AD conversion unit 53 are coherently added, and a beam signal in which the focus of the ultrasonic echo is narrowed down is obtained.

[0027] As shown in FIG. 3, the image data generation unit 33 has a configuration in which the signal processing unit 55 and the DSC (Digital Scan Converter) 56 are connected in series.

[0028] The signal processing unit 55 corrects the attenuation due to distance according to the depth of the reflection position of the ultrasonic wave using the sound velocity value set by the probe control unit 16 for the beam signal received from the transceiver circuit 12, and then performs envelope detection processing to generate a B-mode image signal, which is tomographic image information regarding the tissue in the subject.

[0029] The DSC 56 converts (raster-converts) the B-mode image signal generated by the signal processing unit 55 into an image signal conforming to the scanning method of a normal television signal. The image signal thus obtained is called image data.

[0030] The communication circuit 14 notifies each other of operations related to the transmission and reception of ultrasonic waves by transmitting synchronization signals to the communication circuit 34 of the slave probe 3 by so-called wireless communication or so-called wired communication. The communication circuit 14 has, for example, an antenna for transmitting and receiving radio waves, or a terminal for connecting a communication cable. As the communication method for wireless communication, for example, Bluetooth (registered trademark) can be used, and Wi-Fi (registered trademark) or UWB (Ultra Wide Band: ultra-wideband wireless communication) can also be used.

[0031] The probe control unit 16 controls each part of the main probe 1 according to a pre-recorded program or the like. Further, the probe control unit 16 controls the main probe 1 to operate according to a time sequence including a transmission / reception condition setting period for setting the ultrasonic transmission / reception conditions by communicating between the main probe 1 and the sub-probe 3, an ultrasonic transmission / reception period for performing ultrasonic transmission / reception, a standby period for stopping ultrasonic transmission / reception, and a synchronization period for synchronizing with the sub-probe 3.

[0032] For example, as shown in FIG. 4, the time sequence of the operation of the main probe 1 can be set to repeat the ultrasonic transmission / reception period TB, the synchronization period TC1, and the standby period TD in order after the transmission / reception condition setting period TA. At this time, the time sequence of the operation of the sub-probe 3 is set so that the ultrasonic transmission / reception period TB of the main probe 1 and the ultrasonic transmission / reception period TB of the sub-probe 3 do not overlap each other. For example, the time sequence of the operation of the sub-probe 3 can be set to repeat the standby period TD, the synchronization period TC1, and the ultrasonic transmission / reception period TB in order after the transmission / reception condition setting period TA. Here, the ultrasonic transmission / reception period TB and the standby period TD are periods of the same length as each other and can be set to about 80 milliseconds, for example. Also, the synchronization period TC1 can be set to several milliseconds, for example.

[0033] Further, in the synchronization period TC1, the probe control unit 16 generates a synchronization signal for synchronizing with the sub-probe 3, and transmits the generated synchronization signal to the sub-probe 3 via the communication circuit 14, thereby performing a process of synchronizing the operation of the main probe 1 with the operation of the sub-probe 3 so that the end of the synchronization period TC1 of the main probe 1 coincides with the end of the synchronization period TC1 of the sub-probe 3. Also, the probe control unit 16 detects the state in the time sequence of the sub-probe 3, that is, which state of the ultrasonic transmission / reception period TB, the synchronization period TC1, and the standby period TD the sub-probe 3 is in. At this time, for example, the probe control unit 16 can detect the state of the sub-probe 3 by receiving a synchronization signal in response to the synchronization signal transmitted to the sub-probe 3 from the sub-probe 3.

[0034] Further, when the synchronization between the main probe 1 and the slave probe 3 fails during the synchronization period TC1, as shown in FIG. 5, the probe control unit 16 returns the state of the main probe 1 to the transmission / reception condition setting period TA so that synchronization with the slave probe 3 can be achieved. Then, according to the time sequence, the main probe 1 is operated again in a defined order such as the ultrasonic transmission / reception period TB, the synchronization period TC1, the standby period TD, and so on.

[0035] Here, when the probe control unit 16 cannot detect the state of the slave probe 3 throughout the synchronization period TC1, that is, when communication between the main probe 1 and the slave probe 3 is impossible and it is impossible to determine whether synchronization has been performed normally, it can be determined that the synchronization between the main probe 1 and the slave probe 3 has failed during the synchronization period TC1. For example, when the communication circuit 14 of the main probe 1 is connected to the slave probe 3 by wireless communication, it is conceivable that the wireless transmission of the synchronization signal is disturbed by external electromagnetic wave noise, and thus the probe control unit 16 cannot detect the state of the slave probe 3 throughout the synchronization period TC1. Examples of external electromagnetic wave noise include communication signals emitted from communication devices such as wireless LAN (Local Area Network) devices or Bluetooth (registered trademark) devices, electromagnetic waves emitted from electrical devices such as electric razors, radiation devices, or air purifiers, and the like.

[0036] Also, when the probe control unit 16 can detect the state of the slave probe 3 during the synchronization period TC1, it can be determined that the synchronization between the main probe 1 and the slave probe 3 has been successful.

[0037] In addition, the ultrasonic transmission / reception conditions include the order of the ultrasonic transmission / reception period TB, the synchronization period C1, and the standby period TD in the main probe 1 and the slave probe 3, the number of frames of the ultrasonic image acquired during the ultrasonic transmission / reception period TB, and so on.

[0038] When the synchronization between the main probe 1 and the slave probe 3 fails during the synchronization period TC1, for example, as shown in FIG. 5, the synchronization period extension unit 15 extends the synchronization period TC1 and sets a new synchronization period TC2. As schematically shown in FIG. 6, for example, the synchronization period extension unit 15 stores a predetermined extension period TE in advance, and can set the synchronization period TC2 by adding the extension period TE to the synchronization period TC1. Note that the extension period TE can be set to the same length as the synchronization period TC1.

[0039] In addition, the synchronization period extension unit 15 can further extend the synchronization period TC1 every time the synchronization between the main probe 1 and the slave probe 3 fails. For example, after the synchronization period TC1 is extended and the synchronization period TC2 is set, when the synchronization between the main probe 1 and the slave probe 3 fails during the synchronization period TC2, the synchronization period extension unit 15 adds the extension period TE to the synchronization period TC2 to set the synchronization period TC3 schematically shown in FIG. 7.

[0040] The processor 17 having the transmission / reception circuit 12, the image data generation unit 13, the synchronization period extension unit 15, and the probe control unit 16 of the main probe 1 is composed of a CPU (Central Processing Unit) and a control program for causing the CPU to perform various processes. However, it may be composed of an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a GPU (Graphics Processing Unit), or other ICs (Integrated Circuits), or may be composed of a combination thereof.

[0041] In addition, the transmission / reception circuit 12, the image data generation unit 13, the synchronization period extension unit 15, and the probe control unit 16 of the processor 17 can also be configured to be integrated partially or entirely into one CPU or the like.

[0042] The image processing unit 21 of the apparatus main body 2 performs various necessary image processes such as gradation processing on the image data input from the image data generation unit 13 of the main probe 1, and then sends the image data to the display control unit 22. Hereinafter, the image data on which various necessary image processes such as gradation processing have been performed is referred to as an ultrasonic image.

[0043] The display control unit 22 performs predetermined processes on the ultrasonic image and the like generated by the image processing unit 21 under the control of the main body control unit 24, and displays them on the monitor 23.

[0044] The input device 25 is for the user to perform input operations. The input device 25 is constituted by, for example, devices for the user to perform input operations such as a keyboard, a mouse, a trackball, a touch pad, and a touch panel.

[0045] The main body control unit 24 controls each part of the apparatus main body 2 according to a program recorded in advance or the like. At this time, the main body control unit 24 receives the time sequence information of the main probe 1 from the probe control unit 16 of the main probe 1, and can control each part of the apparatus main body 2 to perform image data processing and display of the ultrasonic image based on the received time sequence information. In addition, the main body control unit 24 can control each part of the apparatus main body 2 based on the instruction information input from the user via the input device 25. Further, the main body control unit 24 can transmit the instruction information input from the user to the probe control unit 16 of the main probe 1. At this time, the probe control unit 16 of the main probe 1 can control each part of the main probe 1 to perform transmission and stop of ultrasonic waves and the like based on the received instruction information.

[0046] Note that the processor 26 having the image processing unit 21, display control unit 22, and main body control unit 24 of the apparatus main body 2 is composed of a CPU and a control program for causing the CPU to perform various processes, but it may be configured using an FPGA, DSP, ASIC, GPU, or other IC, or may be configured by combining them.

[0047] Also, the image processing unit 21, display control unit 22, and main body control unit 24 of the processor 26 can be configured by being partially or entirely integrated into one CPU or the like.

[0048] Since the oscillator array 31, transmission / reception circuit 32, image data generation unit 33, communication circuit 34, and probe control unit 36 of the slave probe 3 are respectively the same as those of the master probe 1, namely the oscillator array 11, transmission / reception circuit 12, image data generation unit 13, communication circuit 14, and probe control unit 16, detailed descriptions of the oscillator array 31, transmission / reception circuit 32, image data generation unit 33, communication circuit 34, and probe control unit 36 of the slave probe 3 are omitted.

[0049] Note that the processor 37 having the transmission / reception circuit 32, image data generation unit 33, and probe control unit 36 of the slave probe 3 is composed of a CPU and a control program for causing the CPU to perform various processes, but it may be configured using an FPGA, DSP, ASIC, GPU, or other IC, or may be configured by combining them. Also, the transmission / reception circuit 32, image data generation unit 33, and probe control unit 36 of the processor 37 can be configured by being partially or entirely integrated into one CPU or the like.

[0050] Since the apparatus main body 4 connected to the slave probe 3 is the same as the apparatus main body 2 connected to the master probe 1, detailed descriptions of the apparatus main body 4 are omitted.

[0051] Next, an example of the operation of the ultrasonic diagnostic apparatus according to Embodiment 1 will be described using the flowchart of FIG. 8. It is assumed that the main probe 1 and the sub-probe 3 are in contact with the body surface of the subject in order to capture an ultrasonic image representing a tomographic image within the subject.

[0052] First, in step S1, as shown in FIG. 4, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 set the main probe 1 and the sub-probe 3 to the transmission / reception condition setting period TA, and cause the main probe 1 and the sub-probe 3 to communicate with each other, thereby setting the transmission / reception conditions of the main probe 1 and the sub-probe 3.

[0053] Next, in step S2, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 set one of the main probe 1 and the sub-probe 3 to the ultrasonic transmission / reception period TB and the other to the standby period TD. In the example shown in FIG. 4, the main probe 1 is set to the ultrasonic transmission / reception period TB and the sub-probe 3 is set to the standby period TD.

[0054] At this time, ultrasonic waves are transmitted from the transducer array 11 of the main probe 1 toward the subject. The transmission / reception circuit 12 performs reception focusing processing under the control of the probe control unit 16 to generate a beam signal. The beam signal generated by the transmission / reception circuit 12 in this way is sent to the image data generation unit 13. The image data generation unit 13 generates image data using the beam signal sent from the transmission / reception circuit 12. The image processing unit 21 processes the image data generated by the image data generation unit 13 to generate an ultrasonic image. The ultrasonic image generated in this way is sent to the monitor 23 via the display control unit 22 and displayed.

[0055] In this way, during the ultrasonic transmission / reception period TB, ultrasonic images are continuously generated by the main probe 1 and the apparatus main body 2, and these ultrasonic images are sequentially displayed on the monitor 23. Further, the sub-probe 3 stops transmitting ultrasonic waves to the subject during the standby period TD, which is a period having the same length as the ultrasonic transmission / reception period TB. Since no ultrasonic image is generated by the sub-probe 3, no ultrasonic image is displayed on the monitor 43 of the apparatus main body 4.

[0056] Here, generally, when ultrasonic waves are transmitted from a plurality of ultrasonic probes to a subject to capture ultrasonic images of respective inspection locations where the plurality of ultrasonic probes are in contact, artifacts may be included in the obtained ultrasonic images due to interference between the ultrasonic waves emitted from the plurality of ultrasonic probes, resulting in a deterioration of the image quality.

[0057] In step S2, since only one of the main probe 1 and the sub-probe 3 is set to the ultrasonic transmission / reception period TB, the ultrasonic waves transmitted from the main probe 1 to the subject and the ultrasonic waves transmitted from the sub-probe 3 to the subject do not interfere with each other, and a deterioration of the image quality of the ultrasonic image can be prevented.

[0058] When the ultrasonic transmission / reception period TB of the main probe 1 and the standby period TD of the sub-probe 3 in step S2 end, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 set the main probe 1 and the sub-probe 3 to the synchronization period TC1 with each other. During the synchronization period TC1, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 perform processes for synchronizing the main probe 1 and the sub-probe 3.

[0059] At this time, the probe control unit 16 of the main probe 1 generates a synchronization signal and transmits the synchronization signal to the slave probe 3 via the communication circuit 14. The communication circuit 34 of the slave probe 3 receives the synchronization signal transmitted from the main probe 1 and sends the synchronization signal to the probe control unit 36. When receiving the synchronization signal, the probe control unit 36 controls each part of the slave probe 3 so that, for example, the synchronization period TC1 of the slave probe 3 ends in accordance with the end of the synchronization period TC1 of the main probe 1. Further, the probe control unit 36 generates a synchronization signal including information indicating that the slave probe 3 is in the state of the ultrasonic transmission / reception period TB, the synchronization period TC1, or the standby period TD, and transmits the synchronization signal to the main probe 1 via the communication circuit 34.

[0060] In step S4, the probe control unit 16 of the main probe 1 determines whether the synchronization between the main probe 1 and the slave probe 3 has failed during the synchronization period TC1 in step S3. For example, when the probe control unit 16 of the main probe 1 detects a synchronization signal from the slave probe 3 via the communication circuit 14 during the synchronization period TC1, it determines that the synchronization has succeeded. Further, for example, when the communication state between the main probe 1 and the slave probe 3 deteriorates for some reason and the synchronization signal cannot be detected throughout the synchronization period TC1 and it is impossible to determine whether the synchronization has been normally performed, the probe control unit 16 determines that the synchronization has failed.

[0061] If it is determined in step S4 that the synchronization has succeeded, the process proceeds to step S5. In step S5, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the slave probe 3 swap the ultrasonic transmission / reception period TB and the standby period TD of the main probe 1 and the slave probe 3 in step S2, and operate the main probe 1 and the slave probe 3. For example, as shown in FIG. 4, when the main probe 1 is set to the ultrasonic transmission / reception period TB and the slave probe 3 is set to the standby period TD in step S2, in step S5, the main probe 1 is set to the standby period TD and the slave probe 3 is set to the ultrasonic transmission / reception period TB.

[0062] In this case, on the monitor 23 of the apparatus main body 2 connected to the main probe 1, so-called freeze display of the ultrasonic image is performed, in which the latest ultrasonic image obtained in step S2 is displayed as a still image. Also, on the monitor 43 of the apparatus main body 4 connected to the sub-probe 3, the ultrasonic images continuously generated by the image processing unit 41 are sequentially displayed.

[0063] When the standby period TD of the main probe 1 and the ultrasonic transmission / reception period TB of the sub-probe 3 end, the process proceeds to step S6. In step S6, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 determine whether to end the examination of the subject. The probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 determine to end the examination of the subject, for example, when an instruction to end the examination is input by the user via the input device 25 of the apparatus main body 2 and the input device 45 of the apparatus main body 4. Also, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 determine to continue the examination, for example, when an instruction to end the examination is not input by the user via the input device 25 of the apparatus main body 2 and the input device 45 of the apparatus main body 4.

[0064] When it is determined in step S6 to end the examination, the operation of the ultrasonic diagnostic apparatus according to the flowchart of FIG. 8 ends. When it is determined in step S6 to continue the examination, the process returns to step S3, and both the main probe 1 and the sub-probe 3 are set to the synchronization period TC1. In this way, as long as it is determined in step S4 that the synchronization between the main probe 1 and the sub-probe 3 in the synchronization period TC1 is successful and it is determined in step S6 to continue the examination, the processes of steps S3 to S6 are repeated.

[0065] When it is determined in step S4 that the synchronization has failed, the process proceeds to step S7. In step S7, the synchronization period extension unit 15 extends the synchronization period TC1. At this time, as schematically shown in FIG. 6, for example, the synchronization period extension unit 15 can set a new synchronization period TC2 by adding a determined extension period TE to the synchronization period TC1. By extending the synchronization period TC1 in this way, it is possible to perform synchronization normally within a period with stable communication conditions without external electromagnetic wave noise.

[0066] Also, by extending the synchronization period TC1, the frame rate of the ultrasonic image captured by the main probe 1 and the frame rate of the ultrasonic image captured by the sub-probe 3 decrease, but since the certainty of synchronization is improved, for example, it is possible to prevent the user from being unable to perform the inspection smoothly due to the failure of synchronization between the main probe 1 and the sub-probe 3. That is, by extending the synchronization period TC1, it is possible to stably acquire the ultrasonic image and display it on the monitors 23 and 43, and it is possible for the user to perform the inspection smoothly.

[0067] In the subsequent step S8, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 set both the main probe 1 and the sub-probe 3 to the standby period TD. At this time, for example, the probe control unit 16 of the main probe 1 can generate information indicating that the synchronization has failed and transmit this information to the sub-probe 3 via the communication circuit 14. The probe control unit 36 of the sub-probe 3 can control each part of the sub-probe 3 to set the sub-probe 3 to the standby period TD based on the information indicating that the synchronization has failed received by the communication circuit 34.

[0068] When the standby period TD of the main probe 1 and the sub-probe 3 ends in step S8, the process proceeds to step S9. In step S9, the probe control unit 16 of the main probe 1 and the probe control unit 36 of the sub-probe 3 determine whether to end the inspection of the subject in the same manner as in step S6. If it is determined in step S9 that the inspection is to be continued, the process returns to step S1. As a result, the states of the main probe 1 and the sub-probe 3 return to the transmission / reception condition setting period TA, and they can be synchronized with each other.

[0069] In this way, as long as it is determined that synchronization has failed in step S4 and it is determined to continue the inspection in step S9, the processes of steps S1 to S4 and steps S7 to S9 are repeated.

[0070] Here, in step S7, the synchronization period extension unit 15 can further extend the already extended synchronization period every time the synchronization between the main probe 1 and the slave probe 3 fails in step S4. For example, as shown in FIG. 7, when it is determined that synchronization has failed twice in step S4, a new synchronization period TC3 can be set by adding an extension period TE to the synchronization period TC2 which is the period after the synchronization period TC1 has been extended once.

[0071] In this way, by extending the synchronization period TC1, the main probe 1 and the slave probe 3 can more reliably perform normal synchronization.

[0072] When it is determined to end the inspection in step S9, the operation of the ultrasonic diagnostic apparatus according to the flowchart of FIG. 8 ends.

[0073] From the above, according to the ultrasonic diagnostic apparatus according to Embodiment 1 of the present invention, when the synchronization between the main probe 1 and the slave probe 3 fails during the synchronization period TC1, the synchronization period extension unit 15 extends the synchronization period TC1, so that the main probe 1 and the slave probe 3 can be more reliably synchronized, and the user can smoothly perform an inspection on the subject.

[0074] It should be noted that although it has been described that the image processing unit 21 is provided in the apparatus main body 2, it may be provided in the main probe 1 instead of the apparatus main body 2. Similarly, the image processing unit 41 may also be provided in the slave probe 3 instead of the apparatus main body 4.

[0075] In addition, the main probe 1 and the apparatus main body 2 may be connected to each other by wired communication or wireless communication. When the main probe 1 and the apparatus main body 2 are connected to each other by wireless communication, and the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3 are connected to each other by wireless communication, the communication method between the main probe 1 and the apparatus main body 2 and the communication method between the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3 can be made different from each other. That is, for example, the communication method between the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3 can be set as a first wireless method, and the communication method between the main probe 1 and the apparatus main body 2 can be set as a second wireless method different from the first wireless method.

[0076] The communication method between the main probe 1 and the apparatus main body 2 and the communication method between the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3 can also be set as the same wireless method. However, in order to prevent the communication method between the main probe 1 and the apparatus main body 2 from becoming electromagnetic wave noise for the wireless communication between the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3, it is preferable that the communication method between the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3 is set as a first wireless method, and the communication method between the main probe 1 and the apparatus main body 2 is set as a second wireless method.

[0077] In addition, the slave probe 3 and the apparatus main body 4 can be connected to each other by wired communication or wireless communication. When the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3 are connected by wireless communication, and the slave probe 3 and the apparatus main body 4 are connected by wireless communication, the same method or different methods can be used as the wireless method between the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3 and the wireless method between the slave probe 3 and the apparatus main body 4. However, in order to prevent the communication method between the slave probe 3 and the apparatus main body 4 from becoming electromagnetic wave noise for the wireless communication between the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3, it is preferable that the communication method between the communication circuit 14 of the main probe 1 and the communication circuit 34 of the slave probe 3 is set as a first wireless method, and the communication method between the slave probe 3 and the apparatus main body 4 is set as a second wireless method.

[0078] Also, although it is described that the main probe 1 and the sub-probe 3 directly transmit and receive a synchronization signal, by providing a communication circuit 14 in the apparatus main body 2 and a communication circuit 34 in the apparatus main body 4, it is also possible to indirectly transmit and receive the synchronization signal between the main probe 1 and the sub-probe 3 via the apparatus main body 2 and the apparatus main body 4.

[0079] Also, although it is described that when the synchronization between the main probe 1 and the sub-probe 3 fails, the synchronization period TC1 is automatically extended by the synchronization period extension unit 15, the synchronization period extension unit 15 can also extend the synchronization period TC1 based on a user input operation via the input device 25 of the apparatus main body 2 or the input device of the apparatus main body 4. When it is determined by the probe control unit 16 of the main probe 1 that the synchronization has failed, the synchronization period extension unit 15 can, for example, display a message asking whether to extend the synchronization period TC1 on the monitor 23 of the apparatus main body 2 or the monitor 43 of the apparatus main body 4. The synchronization period extension unit 15 can extend the synchronization period TC1 when an instruction to extend the synchronization period TC1 is input by the user via the input device 25 of the apparatus main body 2 or the input device 45 of the apparatus main body 4.

[0080] Also, although it is described that the synchronization period extension unit 15 gradually extends the synchronization period TC1 every time the synchronization between the main probe 1 and the sub-probe 3 fails, the maximum value of the extension of the synchronization period TC1, such as 100 milliseconds to 1 second, can be set in advance. Thereby, it is possible to prevent the synchronization period TC1 from becoming extremely long and to extend the synchronization period TC1 to such an extent that the user can smoothly perform the inspection.

[0081] Also, the synchronization period extension unit 15 can also extend the synchronization period TC1 to the maximum value of the extension at once. However, in order not to unduly reduce the frame rate of the ultrasonic image, it is preferable to gradually extend the synchronization period TC1.

[0082] Further, when the synchronization between the main probe 1 and the sub-probe 3 fails a predetermined number of times, the probe control unit 16 of the main probe 1 or the probe control unit 36 of the sub-probe 3 may display a warning message on the monitor 23 via the main body control unit 24 of the apparatus main body 2, or may display it on the monitor 43 via the main body control unit 44 of the apparatus main body 4. Thereby, the user can easily grasp that the communication state between the main probe 1 and the sub-probe 3 has deteriorated, and can take measures to recover the communication state.

[0083] Further, the synchronization period extension unit 15 can be set such that the already extended synchronization period TC1 does not return to the initial value automatically, but only returns to the initial value by a user input operation via the input device 25 of the apparatus main body 2 or the input device 45 of the apparatus main body 4. Thereby, for each inspection, an appropriate length of the synchronization period TC1 can be set according to the communication state between the main probe 1 and the sub-probe 3, and an ultrasonic image can be obtained at a stable frame rate.

[0084] Further, the synchronization period extension unit 15 may be provided in the sub-probe 3 instead of the main probe 1, or may be provided in both the main probe 1 and the sub-probe 3.

[0085] Also, although the ultrasonic diagnostic apparatus has been described as including two ultrasonic probes, the main probe 1 and the sub-probe 3, it may also include three or more ultrasonic probes. Further, in this case, the ultrasonic diagnostic apparatus may also include three or more apparatus main bodies corresponding to the three or more ultrasonic probes.

[0086] Although not shown, an example in which the ultrasonic diagnostic apparatus includes three ultrasonic probes, the main probe 1, the first sub-probe, and the second sub-probe, will be described. The first sub-probe and the second sub-probe are the same as the sub-probe 3 shown in FIG. 1. The main probe 1, the first sub-probe, and the second sub-probe are communicatively connected to each other.

[0087] In this case, the main probe 1, the first sub-probe, and the second sub-probe can operate according to a time sequence as shown in, for example, FIG. 9. In the time sequence of FIG. 9, the main probe 1 operates in the order of transmission / reception condition setting period TA, ultrasonic transmission / reception period TB, synchronization period TC1, standby period TD, synchronization period TC1, standby period TD, synchronization period TC1, ultrasonic transmission / reception period TB, and so on. The first sub-probe operates in the order of transmission / reception condition setting period TA, standby period TD, synchronization period TC1, ultrasonic transmission / reception period TB, synchronization period TC1, standby period TD, synchronization period TC1, standby period TD, and so on. The second sub-probe operates in the order of transmission / reception condition setting period TA, standby period TD, synchronization period TC1, standby period TD, synchronization period TC1, ultrasonic transmission / reception period TB, synchronization period TC1, standby period TD, and so on.

[0088] In this way, the main probe 1, the first sub-probe, and the second sub-probe operate such that only one of the main probe 1, the first sub-probe, and the second sub-probe is set to the ultrasonic transmission / reception period TB.

[0089] For example, as shown in FIG. 10, when the synchronization of the main probe 1, the first sub-probe, and the second sub-probe fails during the first synchronization period TC1, the synchronization period extension part 15 of the main probe 1 extends the synchronization period TC1 to set the synchronization period TC2. Thereafter, the main probe 1, the first sub-probe, and the second sub-probe all enter the standby period TD, and the operations of the main probe 1, the first sub-probe, and the second sub-probe are restarted from the transmission / reception condition setting period TA. After the restart of the operations of the main probe 1, the first sub-probe, and the second sub-probe, the extended synchronization period TC2 is used.

[0090] In this way, even when the ultrasonic diagnostic apparatus includes three or more ultrasonic probes, similar to the case where the ultrasonic diagnostic apparatus includes two ultrasonic probes, i.e., the main probe 1 and the sub-probe 3, when the synchronization of the plurality of ultrasonic probes fails, the synchronization period TC1 is extended by the synchronization period extension part 15, so that the plurality of ultrasonic probes can be surely synchronized with each other, and the user can smoothly perform an examination on the subject.

[0091] Also, although it is described that the ultrasonic diagnostic apparatus may include a plurality of apparatus main bodies corresponding to a plurality of ultrasonic probes, it can also include only one apparatus main body. Also, the apparatus main bodies 2 and 5 may be composed of a so-called tablet-type computer and a portable device such as a so-called smartphone, or may be composed of a so-called stationary device. When the ultrasonic diagnostic apparatus includes only one apparatus main body, it is preferable that the ultrasonic diagnostic apparatus is configured by a stationary device that can be provided with a monitor larger than a portable device such as a tablet-type computer and a smartphone so that the user can easily check the monitor of the apparatus main body.

[0092] Also, for example, when the apparatus main body 2 connected to the main probe 1 and the sub-probe 3 are communicatively connected, the image processing unit 21 of the apparatus main body 2 can generate a three-dimensional ultrasonic image based on the image data generated by the main probe 1 and the image data generated by the sub-probe 3. The generated three-dimensional ultrasonic image is displayed on the monitor 23 after various processes are performed by the display control unit 22. Also, when the apparatus main body 4 connected to the sub-probe 3 and the main probe 1 are communicatively connected, the image processing unit 41 of the apparatus main body 4 can generate a three-dimensional ultrasonic image based on the image data generated by the main probe 1 and the image data generated by the sub-probe 3. The generated three-dimensional ultrasonic image is displayed on the monitor 43 after various processes are performed by the display control unit 42.

[0093] Similarly, when the ultrasonic diagnostic apparatus includes a plurality of ultrasonic probes and a plurality of apparatus main bodies, at least one of the plurality of apparatus main bodies can generate a three-dimensional ultrasonic image based on the image data transmitted from each of the plurality of ultrasonic probes. The three-dimensional ultrasonic image generated in this way is displayed on the monitor of at least one of the plurality of apparatus main bodies.

[0094] Embodiment 2 Based on the image data generated by the main probe 1, an ultrasonic image is displayed on the monitor 23 of the apparatus main body 2, and based on the image data generated by the sub-probe 3, an ultrasonic image is displayed on the monitor 43 of the apparatus main body 4. However, in order for the user to easily view the ultrasonic image, the ultrasonic image may be displayed on a display device having a relatively large monitor.

[0095] FIG. 11 shows an ultrasonic diagnostic apparatus according to Embodiment 2. The ultrasonic diagnostic apparatus is obtained by adding a display device 6 to the ultrasonic diagnostic apparatus of Embodiment 1 shown in FIG. 1. In the ultrasonic diagnostic apparatus of Embodiment 2, the display device 6 is connected to the apparatus main body 2 and the apparatus main body 4.

[0096] The display device 6 is constituted by a monitor that is relatively larger than the monitor 23 of the apparatus main body 2 and the monitor 43 of the apparatus main body 4. Both the ultrasonic image generated by the apparatus main body 2 and the ultrasonic image generated by the apparatus main body 4 are transmitted to the display device 6, and these two ultrasonic images are simultaneously displayed on the display device 6. Thereby, the user can easily view the two ultrasonic images simultaneously displayed on the display device 6 and perform the examination on the subject more smoothly.

[0097] Note that the ultrasonic diagnostic apparatus of Embodiment 2 can include three or more ultrasonic probes and three or more apparatus main bodies corresponding thereto, similar to the ultrasonic diagnostic apparatus of Embodiment 1. For the user, it may be difficult to view all the monitors of the plurality of apparatus main bodies in order to view the plurality of obtained ultrasonic images. However, by viewing one display device 6, the user can easily view the plurality of ultrasonic images simultaneously displayed.

[0098] In addition, at least one of the plurality of device main bodies in Embodiment 2 can generate a three-dimensional ultrasonic image based on the image data transmitted from the plurality of ultrasonic probes in the same manner as in Embodiment 1. In this case, the display device 6 can display the three-dimensional ultrasonic image. By checking the display device 6 composed of a monitor that is relatively larger than the monitors of the plurality of device main bodies, the user can easily and more detailedly check the three-dimensional ultrasonic image.

Explanation of Signs

[0099] 1 Main probe, 2,4 Device main body, 3 Sub-probe, 6 Display device, 11,31 Transducer array, 12,32 Transmission / reception circuit, 13,33 Image data generation unit, 14,34 Communication circuit, 15 Synchronization period extension unit, 16,36 Probe control unit, 17,26,37,46 Processor, 21,41 Image processing unit, 22,42 Display control unit, 23,43 Monitor, 24,44 Main body control unit, 25,45 Input device, 51 Pulser, 52 Amplifier, 53 AD converter, 54 Beamformer, 55 Signal processing unit, 56 DSC, TA Transmission / reception condition setting period, TB Ultrasonic transmission / reception period, TC1,TC2,TC3 Synchronization period, TD Standby period, TE Extension period.

Claims

1. Comprising a plurality of ultrasonic probes each for transmitting and receiving ultrasonic waves, the plurality of ultrasonic probes having a communication circuit for notifying an operating state related to transmission and reception of ultrasonic waves by transmitting a synchronization signal to each other, the plurality of ultrasonic probes each operating according to a time sequence including at least an ultrasonic transmission / reception period for transmitting and receiving ultrasonic waves, a standby period for stopping transmission and reception of ultrasonic waves, and a synchronization period for synchronizing with each other, when any one of the plurality of ultrasonic probes is in the ultrasonic transmission / reception period, the other ultrasonic probes are in the standby period, when any one of the plurality of ultrasonic probes is in the synchronization period, the other ultrasonic probes are also in the synchronization period, an ultrasonic diagnostic apparatus in which, when synchronization fails between the plurality of ultrasonic probes during the synchronization period, the synchronization period is extended, and when a state where synchronization with each other can be achieved is reached, any one of the ultrasonic probes enters the ultrasonic transmission / reception period.

2. Comprising an input device for a user to perform an input operation, the ultrasonic diagnostic apparatus according to Claim 1, wherein when the synchronization period is extended, the synchronization period returns to the length before extension only when the user operates via the input device.

3. One of the plurality of ultrasonic probes operates as a main probe, and the remaining ultrasonic probes operate as slave probes, the ultrasonic diagnostic apparatus according to Claim 2, wherein the main probe has a synchronization period extension unit for extending the synchronization period when the synchronization signal transmitted from the slave probe cannot be detected by the communication circuit during the synchronization period.

4. The ultrasonic diagnostic apparatus according to Claim 3, wherein the synchronization period extension unit automatically extends the synchronization period when the synchronization signal transmitted from the slave probe cannot be detected by the communication circuit during the synchronization period.

5. The ultrasonic diagnostic apparatus according to Claim 3, wherein the synchronization period extension unit extends the synchronization period based on an input operation by the user via the input device.

6. The ultrasonic diagnostic apparatus according to any one of Claims 1 to 5, wherein a maximum value of the extension of the synchronization period is defined.

7. The ultrasonic diagnostic apparatus according to any one of Claims 1 to 6, wherein the synchronization period is extended step by step.

8. Comprising a plurality of device main bodies corresponding to the plurality of ultrasonic probes and respectively connected to the plurality of ultrasonic probes, The plurality of ultrasonic probes each acquire image data by transmitting and receiving ultrasonic waves during the ultrasonic transmission and reception period, and transmit the image data to the corresponding device main body. The ultrasonic diagnostic apparatus according to any one of claims 1 to 7.

9. The plurality of ultrasonic probes wirelessly transmit the synchronization signal to the other ultrasonic probes, The plurality of ultrasonic probes each transmit the image data to the corresponding device main body by wire. The ultrasonic diagnostic apparatus according to claim 8.

10. The plurality of ultrasonic probes transmit the synchronization signal to the other ultrasonic probes by a first wireless method, The plurality of ultrasonic probes each transmit the image data to the corresponding device main body by a second wireless method. The ultrasonic diagnostic apparatus according to claim 8.

11. The plurality of ultrasonic probes transmit the synchronization signal to each other via the plurality of device main bodies. The ultrasonic diagnostic apparatus according to any one of claims 8 to 10.

12. Comprising one display device connected to the plurality of device main bodies, Based on the plurality of image data transmitted from the plurality of ultrasonic probes to the plurality of device main bodies, a plurality of ultrasonic images are simultaneously displayed on the display device. The ultrasonic diagnostic apparatus according to any one of claims 8 to 11.

13. At least one of the plurality of device main bodies generates a three-dimensional ultrasonic image based on the image data respectively transmitted from the plurality of ultrasonic probes, The three-dimensional ultrasonic image is displayed on the display device. The ultrasonic diagnostic apparatus according to claim 12.

14. The plurality of ultrasonic probes each, A transducer array, A transmission and reception circuit that transmits ultrasonic waves from the transducer array and generates a beam signal based on a reception signal acquired by the transducer array, An image data generation unit that generates the image data based on the beam signal generated by the transmission and reception circuit The ultrasonic diagnostic apparatus according to any one of claims 8 to 13, comprising.

15. A control method for an ultrasonic diagnostic apparatus comprising a plurality of ultrasonic probes each performing ultrasonic transmission and reception, wherein The plurality of ultrasonic probes notify an operating state related to ultrasonic transmission and reception by transmitting a synchronization signal to each other, Each of the plurality of ultrasonic probes operates according to a time sequence including an ultrasonic transmission / reception period for transmitting and receiving ultrasonic waves, a standby period for not transmitting and receiving ultrasonic waves, and a synchronization period for synchronizing with each other. When any one of the plurality of ultrasonic probes is in the ultrasonic transmission / reception period, the other ultrasonic probes are in the standby period. When any one of the plurality of ultrasonic probes is in the synchronization period, the other ultrasonic probes are also in the synchronization period. A control method for an ultrasonic diagnostic apparatus, in which when the plurality of ultrasonic probes fail to synchronize with each other during the synchronization period, the synchronization period is extended, and after a state where the plurality of ultrasonic probes can synchronize with each other is achieved, any one of the ultrasonic probes enters the ultrasonic transmission / reception period.

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