JP2009291515A - Ultrasonic diagnosing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an error correction system according to the contents of data to be wirelessly transmitted. <P>SOLUTION: An error correction code is added at a rate of redundant codes according to the importance degree of the contents of the data to be transmitted. For example, as shown in (II), a 150-bit redundant code (the redundant code proportion is 0.6) corresponding to the 60% of 250-bit data amount of data a1 is added to the data a1 with a larger importance degree from among the data A, and a 50-bit redundant code (the redundant code proportion is 0.067) corresponding to the 6.67% of 750-bit data amount of data a2 is added to the data a2 with a smaller importance degree from among the data A. Consequently, when the data amounts of the whole data A are compared, the data amount is 1,500 bit when the redundant code proportion in (I) is 0.5 and uniform, but the data amount is 1,200 bit in (II). Thus, the data amount is reduced to 80 percent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ultrasonic diagnostic apparatus that wirelessly transmits and receives signals between an ultrasonic probe and an apparatus main body.

  There is known a wireless ultrasonic diagnostic apparatus that wirelessly transmits echo data or the like obtained by an ultrasonic probe to the apparatus main body (see Patent Documents 1 to 3).

  In the wireless ultrasonic diagnostic apparatus, a radio signal modulated by an ultrasonic signal or the like is transmitted into space from a transmission antenna of an ultrasonic probe. Then, the radio signal is received by a receiving antenna provided in the apparatus main body, and the received signal is demodulated in the apparatus main body to perform image processing and the like.

  Generally, in a wireless transmission system, error correction processing is performed on a signal (data) transmitted wirelessly (see Patent Document 4). For example, redundant data for code error correction is added to wirelessly transmitted data, and error detection processing and error correction processing are performed using the redundant data on the receiving side.

JP 2004-141328 A JP 55-151952 A JP-A-53-108690 JP 2007-201649 A

  However, in the conventional general error correction technique, redundant data having a certain correction capability is added to data transmitted by radio. In this case, an increase in the amount of redundant data cannot be ignored if an attempt is made to improve the correction capability. Moreover, if the amount of redundant data is reduced, the correction capability is uniformly reduced.

  Under these circumstances, the inventors of the present application have conducted research and development on improved techniques for realizing a wireless ultrasonic diagnostic apparatus.

  The present invention has been made in the course of its research and development, and an object thereof is to provide an error correction method according to the contents of data transmitted by radio.

  In order to achieve the above object, an ultrasonic diagnostic apparatus according to a preferred aspect of the present invention is an ultrasonic diagnostic apparatus that wirelessly transmits and receives signals between an ultrasonic probe and an apparatus main body, wherein the ultrasonic probe A transmission / reception unit that transmits and receives ultrasonic waves to / from a subject to acquire echo data, and correction according to the importance of the content of the transmission data for transmission data generated based on the echo data A code processing unit that adds an error correction code of capability, and a wireless transmission unit that wirelessly transmits a signal corresponding to transmission data to which the error correction code is added to the device main body, the device main body including the ultrasonic wave A radio reception unit that receives a signal wirelessly transmitted from the probe, a correction processing unit that performs error correction processing according to the error correction code on received data obtained from the signal received by the radio reception unit, and an error An image forming unit for forming an ultrasound image based on the positive processed received data, characterized by having a.

  In a preferred aspect, the code processing unit of the ultrasonic probe adds an error correction code at a redundant code ratio corresponding to the importance of the content of transmission data.

  The present invention provides an error correction method according to the content of data wirelessly transmitted from the ultrasonic probe to the apparatus main body.

  Hereinafter, preferred embodiments of the present invention will be described.

  FIG. 1 shows a preferred embodiment of an ultrasonic diagnostic apparatus according to the present invention, and FIG. 1 is a functional block diagram showing the overall configuration thereof. The ultrasonic diagnostic apparatus according to the present embodiment includes an ultrasonic probe 100 and an apparatus main body 200, and echo data acquired by the ultrasonic probe 100 is transmitted to the apparatus main body 200 as a wireless signal through various signal processes. .

  The ultrasonic probe 100 includes a plurality of transducers 102 that transmit and receive ultrasonic waves to and from a subject. An ultrasonic transmission circuit (not shown) is connected to each transducer 102, and ultrasonic pulses are transmitted from the plurality of transducers 102 toward the subject in accordance with signals output from the transmission circuit. The Then, a plurality of transducers 102 receive reflected waves (echoes) obtained from the subject.

  An amplifier 104 and an analog-digital converter (ADC) 106 are provided corresponding to each of the plurality of vibrators 102. Each amplifier 104 amplifies the reception result of the corresponding transducer 102 and outputs it to the corresponding ADC 106. As a result, the received signal obtained from each transducer 102 is digitized and output from the plurality of ADCs 106 to the digital beam former 108.

  The digital beam former 108 is a circuit that performs reception beam forming by phasing and adding reception data obtained from a plurality of ADCs 106. In the present embodiment, the digital beam former 108 performs a first-stage phasing addition process. That is, for a plurality of transducers 102, for example, 64 transducers 102, the phasing addition processing is performed for each transducer group including eight adjacent transducers 102. Then, phasing addition processing is performed for each of the eight transducer groups, and the phasing addition result of each transducer group is set as one channel, and phasing addition data of a total of eight channels is output from the eight transducer groups.

  Incidentally, the second-stage phasing addition processing is performed in the digital beam former 210 in the apparatus main body 200 described later, and the received data obtained from all the transducers 102 are collected as one beam data.

  The PS conversion unit 110 receives the 8-channel phasing addition data formed in the digital beamformer 108 as parallel data, and converts the received 8-channel parallel data into serial data arranged in a line in the time axis direction. In this way, the phasing addition data for eight channels converted into serial data is output from the PS conversion unit 110.

  The digital beam former 108 performs phasing addition processing on the reception data output one after another for each reception beam. Therefore, the phasing addition results for the plurality of reception beams are output one after another from the digital beam former 108, and the phasing addition data for the plurality of reception beams are output one after another in time series from the PS conversion unit 110. In this process, synchronization data of each reception beam is inserted into a series of serial data output from the PS conversion unit 110, and a segment for each reception beam is provided in the serial data. In addition, attribute data indicating the attribute of the serial data may be added to the serial data.

  The error correction code processing unit 111 adds a code for error correction to the serial data output from the PS conversion unit 110. In the present embodiment, the error correction code processing unit 111 adds an error correction code having a correction capability according to the importance of the content of serial data to serial data. The processing according to the importance will be described later with reference to FIG.

  The wireless transmission unit 112 performs digital modulation processing such as PSK (Phase Shift Keying) based on the serial data to which the code is added in the error correction code processing unit 111. Instead of PSK, digital modulation processing such as ASK (Amplitude Shift Keying) and FSK (Frequency Shift Keying) may be used. Then, the modulated signal is power amplified and transmitted as a radio wave from the transmission antenna 114. The transmission antenna 114 is a planar antenna, for example.

  A radio signal transmitted from the ultrasonic probe 100 is received by the receiving antenna 202 of the apparatus main body 200 and sent to the radio receiving unit 203.

  The wireless reception unit 203 performs preamplification processing, power amplification processing, and the like on the received wireless signal, and further performs demodulation processing on the wireless signal that has been subjected to digital modulation processing such as PSK. Thereby, the data before being modulated by the wireless transmission unit 112 of the ultrasonic probe, that is, the data corresponding to the serial data output from the error correction code processing unit 111 is reproduced.

  The error correction processing unit 204 performs error correction processing on the data obtained by the demodulation processing. That is, error correction processing corresponding to the error correction code added by the error correction code processing unit 111 is performed on the data reproduced by the wireless reception unit 203. As a result, for example, even when a data error occurs due to the influence of wireless transmission / reception, the original data is restored within the range of error correction capability. That is, the serial data output from the PS conversion unit 110 is restored.

  The SP conversion unit 206 converts the 8-channel phasing addition data included in the serial data output from the error correction processing unit 204 into parallel data. At this time, the data is converted into 8-channel parallel data based on the synchronization data of the received beam included in the serial data.

  Thus, parallel data corresponding to the data formed by the digital beam former 108 of the ultrasonic probe 100 is stored in the memory 208. Data stored in the memory 208 is read at a timing corresponding to the subsequent processing of the memory 208. As the memory 208, for example, a first input first output (FIFO) type device is used.

  The digital beam former 210 reads the parallel data stored in the memory 208 and executes the second-stage phasing addition process. That is, parallel data corresponding to the data formed by the digital beamformer 108 is read from the memory 208, phasing addition processing is executed based on the read parallel data for eight channels, and the reception data obtained from all the transducers 102 is obtained. The wave data is collected to form one beam data. The beam data is sequentially formed for each received beam and output to the image forming unit 212.

  The image forming unit 212 forms image data of ultrasonic images such as a B-mode image, an M-mode image, and a Doppler image based on beam data that is sequentially formed for each reception beam. Then, an ultrasonic image corresponding to the formed image data is displayed on the monitor 214.

  FIG. 2 is a diagram for explaining the addition of error correction codes according to the importance of data contents. FIG. 2 (I) shows an example in which error correction codes are added to data at a uniform redundant code ratio. In other words. FIG. 2I shows an example in which a redundant code corresponding to 50% of the amount of data to be transmitted (redundant code ratio is 0.5) is added to each of data A and data B to be transmitted. ing. That is, a 500-bit redundant code is added to 1000-bit data A, and a 500-bit redundant code is added to 1000-bit data B.

  On the other hand, FIG. 2 (II) shows an addition example of the error correction code in the present embodiment. In the present embodiment, error correction codes are added at a redundant code ratio according to the importance of the content of data to be transmitted (serial data output from the PS converter 110 in FIG. 1).

  For example, as shown in FIG. 2 (II), for data a1 having a high degree of importance in data A, this corresponds to 60% of the data amount of 250 bits of data a1 (redundant code ratio is 0.6). ) A 150-bit redundant code is added. Further, a 50-bit redundant code corresponding to 6.67% of the data amount 750 bits of the data a2 (redundant code ratio is 0.067) is added to the data a2 having a low importance level in the data A2. Is done.

  Compared with the case where the redundant code ratio in FIG. 2 (I) is uniform at 0.5, the data a1 having a high importance in FIG. 2 (II) has an increased redundant code ratio of 0.6. That is, the correction capability of the data a1 having a high importance level is enhanced. Further, when the total data amount of the data A to which the redundant code is added is compared with 1500 bits in FIG. 2 (I), it becomes 1200 bits in FIG. 2 (II), and the data amount is 80%. Has been reduced. Therefore, for example, it is possible to use a transmission circuit with a low transmission rate such as reducing the data transmission rate to about 80%, and it is possible to simplify the transmission circuit.

  Note that the importance of data is, for example, in the order of synchronization signal, attribute data, and echo data (ultrasonic RF signal data). That is, among the data included in the data A, the importance of the synchronization signal such as the frame synchronization signal or the beam synchronization signal is maximized, the data having the next highest importance is set as attribute data, and the data having the lower importance is set as echo data To do. Furthermore, the importance may be increased in the order from the LSB to the MSB in the echo data.

  The preferred embodiment of the present invention has been described above. However, according to the above-described embodiment, for example, an error correction code is added at a redundant code ratio corresponding to the importance of data, and therefore a circuit with a low transmission rate is used. Thus, it is possible to simplify the transmission unit. In addition, by switching to the error correction method of the above-described embodiment when the wireless environment is deteriorated, it is possible to provide a good ultrasonic image with less noise.

  In addition, embodiment mentioned above, its effect, etc. are only illustrations in all the points, and do not limit the scope of the present invention. The present invention includes various modifications without departing from the essence thereof. For example, various modifications are included in the arrangement of the error correction code processing unit 111 and the error correction processing unit 204 and the error correction code processing method.

1 is a functional block diagram showing an overall configuration of an ultrasonic diagnostic apparatus according to the present invention. It is a figure for demonstrating addition of the error correction code | cord | chord according to importance.

Explanation of symbols

  100 ultrasonic probe, 111 error correction code processing unit, 200 apparatus main body, 204 error correction processing unit.

Claims (2)

In the ultrasonic diagnostic apparatus that wirelessly transmits and receives signals between the ultrasonic probe and the apparatus main body,
The ultrasonic probe is
A transmission / reception unit that transmits / receives ultrasonic waves to / from a subject to acquire echo data;
A code processing unit that adds an error correction code having a correction capability according to the importance of the content of the transmission data to the transmission data generated based on the echo data;
A wireless transmission unit that wirelessly transmits a signal corresponding to transmission data to which an error correction code is added to the apparatus body;
Have
The device body is
A wireless receiving unit for receiving a signal wirelessly transmitted from the ultrasonic probe;
A correction processing unit that performs error correction processing according to the error correction code on the reception data obtained from the signal received by the wireless reception unit;
An image forming unit that forms an ultrasonic image based on the received data subjected to error correction processing;
Having
An ultrasonic diagnostic apparatus. The ultrasonic diagnostic apparatus according to claim 1,
The code processing unit of the ultrasonic probe adds an error correction code at a redundant code ratio according to the importance of the content of transmission data.
An ultrasonic diagnostic apparatus.

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