JP3889986B2 - Ultrasonic diagnostic equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ultrasonic diagnostic apparatus, and in particular, irradiates ultrasonic waves into a subject, receives ultrasonic waves reflected from the subject, obtains a received signal, and based on the received signal, the inside of the subject. The present invention relates to an ultrasonic diagnostic apparatus for obtaining a tomographic image of the above.
[0002]
[Prior art]
In recent years, in the medical field, ultrasonic pulses are repeatedly transmitted from an ultrasonic transducer into a living tissue, an echo signal of the ultrasonic pulse reflected from the living tissue is received, and information in the living body is converted into a visible image. Various ultrasonic diagnostic apparatuses such as an ultrasonic endoscope for displaying as an ultrasonic tomographic image have been proposed. An ultrasonic diagnostic apparatus is an apparatus that obtains a tomographic image of a biological tissue in the body by utilizing a characteristic that an ultrasonic wave is reflected at an interface of acoustic impedance of the biological tissue.
[0003]
In general, distance resolution and depth are considered important in ultrasonic diagnostic apparatuses. The distance resolution and the depth of penetration depend on the frequency and have a contradictory relationship, making it difficult to achieve both.
[0004]
However, in recent years, a composite piezoelectric body (CPM: Composite Piezo-Electric Material, hereinafter abbreviated as CPM) in which a resin is filled between a plurality of columnar piezoelectric bodies has been developed as disclosed in JP-A-10-308994. I came. Since the vibrator using the CPM is a wide-band vibrator, the signal frequency band is very wide, has a high degree of penetration, and as a result has a high resolution.
[0005]
By using a DFS (Dynamic Frequency Scanning) circuit for the CPM vibrator, it is possible to draw an image with high resolution near the center of the image and good depth in the distance. The DFS circuit is a circuit having a function of changing the reception frequency with time.
[0006]
In addition, the ultrasonic signal reflected from the vicinity in the subject is strong because the influence of absorption attenuation in the subject is small, and the reflected signal from a distant place is weak because of absorption attenuation in the middle.
[0007]
When the ultrasonic signal is attenuated with respect to such a depth direction, the display image becomes glaring in the vicinity and unclear in the distance.
[0008]
Therefore, in order to correct the received signal in the depth direction, an STC (Sensitivity Time Control) circuit that temporally controls the amplification degree of the received signal is provided. The STC circuit controls the gain of the received signal according to the time interval from the time when the ultrasonic signal is transmitted to the time when the received signal is obtained.
[0009]
Further, a lead zirconate titanate (hereinafter abbreviated as PZT) vibrator and a CPM vibrator, which are conventionally used narrow band vibrators, are connected to the same observation device, that is, an ultrasonic diagnostic device, It is adjusted by the same STC circuit.
[0010]
In the case of the PZT vibrator, the frequency band is narrow and the frequency is considered to be a single frequency. Further, the CPM vibrator is a broadband vibrator, and the reception frequency changes with time by using a DFS circuit. In general, the attenuation rate of ultrasonic waves in the body is expressed by the following equation.
[0011]
X (attenuation rate) = 0.3 dB / cm / MHz (1)
According to this equation (1), the attenuation rate of ultrasonic waves is inversely proportional to distance, that is, time and frequency. In the case of the PZT vibrator, since it has a single frequency as described above, the ultrasonic attenuation rate according to the frequency is constant. In the case of the CPM vibrator, as described above, the reception frequency is lowered with time by the DFS circuit. Therefore, unlike the PZT vibrator, the frequency decreases, so the attenuation factor becomes small.
[0012]
Japanese Patent Publication No. 6-40873 discloses a technique for setting an STC curve according to the type of a probe in an ultrasonic diagnostic apparatus.
[0013]
[Problems to be solved by the invention]
When both the PZT vibrator and the CPM vibrator are connected as an ultrasonic transducer to the ultrasonic diagnostic apparatus, the following problems occur.
[0014]
When the PZT vibrator is used, the attenuation factor is relatively high. Therefore, in order to draw a uniform image deeply, it is necessary to widen the variable width of the gain in the STC circuit.
[0015]
When the CPM vibrator is used, the attenuation rate is lower than that of the PZT vibrator. Therefore, the variable width of the gain required for the PZT vibrator is not necessary, but the amount of one step of the variable width should be fine. There is a request. Japanese Patent Publication No. 6-40873 described above sets an STC curve in accordance with the type of the probe, but does not consider the use of a broadband transducer. Therefore, the conventional ultrasonic diagnostic apparatus cannot set an optimum STC circuit for both the narrow-band transducer and the broadband transducer.
[0016]
[Means for Solving the Problems]
The present invention has been made in view of such conventional problems, and an optimum ultrasonic tomographic image can be obtained even when there is a broadband probe among a plurality of used probes. An object of the present invention is to provide an ultrasonic diagnostic apparatus capable of displaying.
[0017]
The ultrasonic diagnostic apparatus of the present invention is a narrowband transducer. Or In an ultrasonic diagnostic apparatus capable of connecting a broadband transducer, transducer identification means for identifying a transducer connected based on an identification signal for identifying the narrowband transducer and the broadband transducer; The first gain data for time control of the narrow-band transducer and the time control of the broadband transducer so as to have a gain change rate smaller than the gain change rate in the first gain data When the gain data storage means for storing the second gain data is identified as being connected to the narrowband vibrator by the vibrator identification means, Uses a circuit that changes the reception frequency over time Without performing gain time control based on the first gain data read from the gain data storage means, and when the broadband identification is identified by the vibrator identification means, A circuit that changes the reception frequency with time is used, and gain time control is performed based on the second gain data read from the gain data storage means. Control means.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0019]
(First embodiment)
First, based on FIG. 1, the structure of the ultrasonic diagnostic system concerning this Embodiment is demonstrated. FIG. 1 is a configuration diagram showing the configuration of the ultrasonic diagnostic apparatus according to the present embodiment.
[0020]
In FIG. 1, 1 is an ultrasonic scope having an ultrasonic probe, and 2 is an ultrasonic observation apparatus as an ultrasonic diagnostic apparatus. The ultrasonic scope 1 includes a probe 3 that is an ultrasonic transducer and a code generation circuit 4. The probe 3 is a PZT vibrator or a CPM vibrator. The code generation circuit 4 is a circuit that generates a code signal preset in the ultrasonic scope 1 itself according to the frequency generated by the probe 3 or the like. That is, a code is assigned in advance to the scope itself according to the type of frequency used, and the code generation circuit 4 of the ultrasonic scope 1 generates a code signal according to the type of the probe 3 to be used. Then, the ultrasonic observation device 2 reads the code signal and recognizes the type of the ultrasonic scope 1.
[0021]
The ultrasonic observation apparatus 2 includes a control unit 5 and a reception circuit 6. The control unit 3 includes a control circuit 7, a first STC table 8, a second STC table 9, a DFS table 10, a first memory 11, a second memory 12, and two digital analog ( D / A) converters 13 and 14 are included. The first STC table 8 is a table for PZT vibrators, and the second STC table 9 is a table for CPM vibrators. The first memory 11 is an STC memory, and the second memory 12 is a DFS memory.
[0022]
The control circuit 7 is a digital processing circuit including a central processing unit (CPU). Data from the first and second STC tables 8 and 9 and the DFS table 10 are input to the control circuit 7. Output data from the control circuit 7 is input to the first and second memories 11 and 12. The first memory 11 is connected to the D / A converter 13, and the second memory 12 is connected to the D / A converter 14.
[0023]
The receiving circuit 6 includes an amplifier circuit 15, a switching circuit 16, an STC circuit 17, a signal processing circuit 18, and a DFS circuit 19. The signal from the probe 3 is input to the amplifier circuit 15, and the output of the amplifier circuit 15 is input to the switching circuit 16. The output from the first D / A converter 13 and the output from the DFS circuit 19 are input to the STC circuit 17. The output of the STC circuit 17 is input to the signal processing circuit 18. The output of the second D / A converter 14 and the output of the switching circuit 16 are input to the DFS circuit 19, and the DFS circuit 19 is input to the STC circuit 17. In other words, the DFS circuit 19 is connected between the switching circuit 16 and the STC circuit 17.
[0024]
The STC circuit 17 is a circuit having a function of temporally controlling the amplification degree of the received signal for the purpose of correcting the attenuation of the ultrasonic signal with respect to the living body. The DFS circuit 19 is a circuit having a function of temporally changing the reception frequency for the purpose of receiving an ultrasonic wave reception signal reflected from a living body with a good S / N ratio and good resolution.
[0025]
Next, the operation of the above configuration will be described.
[0026]
A person who performs ultrasonic diagnosis connects the ultrasonic scope 1 according to the purpose to the ultrasonic observation apparatus 2. The ultrasonic scope 1 generates a code signal which is an identification signal corresponding to the type by the code generation circuit 4 according to the type of the probe 3.
[0027]
The generated code signal is input to the ultrasonic observation apparatus 2. Since the ultrasonic observation apparatus 2 includes the STC table 8 for PZT and the STC table 9 for CPM, the control circuit 7 can control the STC table 8 for PZT and the CPM for CPM based on the input code signal. The STC table 9 is selected, and gain data used for time control is determined. That is, the control circuit 7 controls the rate of change of the step change of the gain of the STC circuit based on the code signal.
[0028]
Further, when it is determined that the CPM vibrator is connected based on the code signal, the control circuit 7 turns on the DFS circuit, and when it is determined that the PZT vibrator is connected, Turn off the DFS circuit.
[0029]
For example, when a PZT transducer is connected as the probe 3, the STC table 8 is selected, and data in the STC table 8 is read and written in the memory 11. When a CPM transducer is connected as the probe 3, switching is performed so that the STC table 9 is selected, and data in the STC table 9 is read and written in the memory 11. The data written in the memory 11 is converted into an analog signal by the D / A converter 13 and given to the STC circuit 17 of the receiving circuit 6. The STC circuit 17 time-controls the input signal using the data of the STC tables 8 and 9 as a gain setting signal. That is, the STC circuit adjusts the gain of the input signal according to the time interval from transmission to reception of the ultrasonic signal based on the gain data of the STC table, and outputs the gain-adjusted signal.
[0030]
Further, when the probe 3 of the CPM transducer is connected, the data in the DFS table 10 is read by the control circuit 7 and written in the memory 12. The data written in the memory 12 is converted into an analog signal by the D / A converter 14 and given to the DFS circuit 19 of the receiving circuit 6.
[0031]
Further, the control circuit 7 and the switching circuit 16 are connected by a control line, and when the probe 3 of the CPM vibrator is connected, the DFS circuit is turned on / off, that is, whether the DFS circuit is used or not is selected. A control signal for this is supplied to the switching circuit 16. When the control signal is received, the switching circuit 16 switches the output of the amplifier circuit 15 to be supplied to the DFS circuit 19, and the output of the DFS circuit is input to the STC circuit 17.
[0032]
The output signal of the probe 3 of the ultrasonic scope 1 is supplied to the amplifier circuit 15. The amplifier circuit 15 amplifies the ultrasonic signal received from the probe 3.
[0033]
When a PZT transducer is connected as the probe 3, the reception signal amplified by the amplifier circuit 15 is supplied to the STC circuit 17 via the switching circuit 16. The signal input to the STC circuit 17 is amplified by the STC circuit 17 while controlling the gain in terms of time based on the data in the STC table 8.
[0034]
When a CPM transducer is connected as the probe 3, the reception signal amplified by the amplifier circuit 15 is supplied to the DFS circuit 19 via the switching circuit 16, filtered by the DFS circuit 19, and desired. Only the frequency band is extracted. The signal filtered by the DFS circuit 19 is amplified by the STC circuit 17 while controlling the gain in time based on the data of the STC table 9.
[0035]
The signal amplified by the STC circuit 17 is supplied to the signal processing circuit 18, scan-converted, and output to a display device (not shown).
[0036]
Next, the function of the DFS circuit 19 will be described with reference to FIGS.
[0037]
FIG. 2 is a diagram for explaining the function of the DFS circuit. In FIG. 2, the horizontal axis represents frequency, and the vertical axis represents output power. The solid line indicates the frequency band of the CPM vibrator. Inconvenience occurs when signal processing is performed using all the frequency components in the portion indicated by the solid line.
[0038]
For example, when it is desired to diagnose a region close to the CPM transducer, that is, a region with a shallow depth, if the low frequency component is included, the resolution in the azimuth direction deteriorates. to degrade. In addition, when it is desired to diagnose a region far away from the CPM vibrator, that is, a region having a deep depth with a good depth of penetration, if the frequency band is widened, the S / N ratio deteriorates and the depth of penetration does not increase as expected. .
[0039]
Therefore, when it is desired to diagnose a region close to the CPM vibrator with high resolution, only the high frequency component t1 indicated by the dotted line in FIG. 2 is used to improve the azimuth resolution. Further, when it is desired to diagnose a region far from the CPM vibrator with a good depth of penetration, as shown by a dotted line t3, only a low frequency component is used to improve the S / N ratio and improve the depth of penetration. . In short, the signal processing is performed while shifting, that is, changing the frequency band from t1 to t3 with time. Therefore, as shown in FIG. 2, signal processing is performed while changing the frequency band between t1 and t3 with time.
[0040]
FIG. 3 is a diagram for explaining data in the DFS table 10. In FIG. 3, the horizontal axis indicates the depth corresponding to time, and the vertical axis indicates the center frequency.
[0041]
FIG. 3 shows how the center frequency changes when the distance from the CPM vibrator is between 0 (zero) and a little over 12 cm. The center frequency is 15.9 MHz for the vicinity, that is, the distance close to the CPM vibrator, but is shifted to 5.2 MHz for the distance, that is, a distance far from the CPM vibrator. More specifically, the center frequency is 15.9 MHz from 0 (zero) to 1 cm, and linearly decreases from 15.9 MHz to 5.2 MHz from 1 cm to 5.5 cm, that is, has a constant slope. It decreases to 5.5 MHz from 5.5 cm to over 12 cm.
[0042]
As shown in FIG. 3, the DFS circuit 19 makes it possible to render an image with good depth even at a distance by changing the frequency with time.
[0043]
Next, using FIG. 4 and FIG. 5, the state of the received signal of the PZT vibrator and the CPM vibrator is shown. FIG. 4 is a diagram for explaining the attenuation state of the received signal in the case of the PZT vibrator. FIG. 5 is a diagram for explaining the attenuation state of the received signal in the case of the CPM vibrator. 4 and 5, the vertical axis represents the signal intensity, and the horizontal axis represents time.
[0044]
The attenuation rate of the ultrasonic reception signal in the living body is expressed by the following equation. The attenuation rate differs depending on the representative value, organ, blood, and the like.
[0045]
X (attenuation rate) = 0.3 dB / cm / MHz (1)
This equation (1) indicates that the ultrasonic reception signal attenuates according to the distance, that is, the time from transmission of the ultrasonic signal to reception. Vp1 is a received signal from the nearby region, Vp2 is a received signal from the intermediate region, and Vp3 is a received signal from the far region. Therefore, as shown in FIG. 4, when the ultrasonic signal Vp0 is transmitted, the attenuation amount of the received signal of PZT increases in the order of Vp1, Vp2, and Vp3 as the distance increases. Since the PZT vibrator has a single frequency characteristic in a narrow band, the attenuation rate is determined by the distance.
[0046]
Next, reception characteristics in the case of the CPM vibrator will be described with reference to FIG. In the case of the CPM vibrator, the received signal is shifted from the high frequency to the low frequency by the DFS circuit 19 according to the distance.
[0047]
In FIG. 5, Vc1 is a received signal from the near area, Vc2 is a received signal from the intermediate area, and Vc3 is a received signal from the far area. Vc1 to Vc3 are levels after passing through the DFS circuit 19. Therefore, as shown in FIG. 5, in the case of the CPM vibrator, when the ultrasonic signal Vc0 is transmitted, the attenuation rate characteristic represented by the equation (1) is larger than that of the single frequency PZT vibrator. , Vc1, Vc2, and Vc3, the difference in the intensity level of the received signal becomes small. The reason is that when the reception frequency Vc2 of the CPM vibrator is the same as the reception frequency of the PZT vibrator of FIG. 1 and the levels of the ultrasonic reception signals VP1 and VP0 that are returned are the same, the center frequency of Vc1 is Vc2. This is because the attenuation rate is higher because it is higher than the frequency, and when Vp1 and Vc1 are compared, Vc1 has a lower signal strength level than Vp1.
[0048]
Next, since the reception frequency of the signal Vc3 is lower than that of Vc2, the attenuation rate is low. When comparing Vp3 and Vc3, the signal strength level of Vc3 is higher than that of Vp3.
[0049]
In summary,
Vp1-Vp3> Vc1-Vc3 (2)
It becomes. What the expression (2) means is that when the PZT vibrator and the CPM vibrator are compared, the received signal of the PZT vibrator greatly changes in intensity level of the received signal with respect to time. This means that a larger variable range is required than when a CPM vibrator is used. Conversely, the reception signal of the CPM vibrator does not need to be as variable as the PZT vibrator in the STC circuit 17 and means that finer variable setting is possible if the number of variable stages is the same.
[0050]
Next, the gain data of the STC table, that is, the STC curve will be described with reference to FIGS. Here, for the sake of simplicity, a description will be given of a case where the variable width of the gain in the STC circuit is variable within a range of ± 3 steps centering on 0.
[0051]
FIG. 6 is a diagram showing a gain setting state in the STC circuit 17 stored in the STC table 8 for the PZT vibrator. FIG. 6 shows a gain setting with respect to the depth direction, that is, the time for setting Vp1 to Vp3 in FIG. 4 to the same level. When the distance from the PZT transducer is 0 cm to 1 cm, the gain is set to the minimum -3 level, and when the distance from the PZT transducer is 3 cm or more, the gain is set to a predetermined depth from 0 cm so that the gain is zero level. The gain is set so as to increase monotonously. Thereby, in the case of the PZT vibrator, a uniform image can be generated.
[0052]
FIG. 7 is a diagram showing a gain setting state in the STC circuit 17 stored in the STC table 9 for the CPM vibrator. FIG. 7 shows the gain setting with respect to the depth direction, that is, the time for setting Vc1 to Vc3 in FIG. 5 to the same level. Similar to the PZT vibrator, when the distance from the CPM vibrator is 0 cm to 1 cm, the minimum level is set to -3 level. The gain is set so as to increase monotonously to a predetermined depth. Thereby, in the case of the CPM vibrator, a uniform image can be generated.
[0053]
However, as shown in FIGS. 6 and 7, the change width per step differs between the gain setting value for the STC circuit 17 for the PZT vibrator and the gain setting value for the STC circuit 17 for the CPM vibrator. That is, the rate of change of the step-like change between the two gain data in FIGS. 6 and 7 is different. The change width per step in FIG. 6 is larger than the change width per step in FIG. That is, by changing the rate of change per step in the case of the PZT vibrator and the case of the CPM vibrator, it is possible to cope with a large variable width in the case of the PZT vibrator. Makes fine gain adjustment possible.
[0054]
As described above, even if there is a broadband probe among the plurality of probes used, by changing the STC table to be used and using the necessary DFS circuit, The ultrasonic diagnostic apparatus can always display an optimal ultrasonic tomographic image.
[0055]
(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. The same components as those of the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions will be mainly described.
[0056]
FIG. 8 is a block diagram showing the configuration of the ultrasonic diagnostic apparatus according to the second embodiment of the present invention. The portion different from FIG. 1 has a frequency changeover switch 20 in the ultrasonic scope 1, and the STC table 9 and the DFS table 10 include a plurality of STC table data corresponding to the frequency and a plurality of DFS tables corresponding to the frequency. It is a point that has data.
[0057]
The CPM vibrator is a wide-band vibrator and can have a wide frequency band as shown in FIG. Using this wide frequency band, the user can select the range of frequencies to be used according to the purpose of diagnosis, diagnosis target, and the like.
[0058]
The switching is performed by switching the frequency switch 20 provided in the ultrasonic scope 1 of FIG. Note that switching can also be performed from a console or the like (not shown).
[0059]
If the frequency used in the CPM vibrator is different, the frequency band to be used is also different, and the DFS table 10 is also different. Furthermore, if the use frequency is different, the STC table to be used is also changed. The reason is that the ultrasonic reception signal has an attenuation characteristic as shown in Expression (1).
[0060]
A plurality of STC tables and a plurality of DFS tables are prepared in advance according to the use frequency in the CPM vibrator, and an optimum STC table is selected from the plurality of STC tables according to the selected use frequency. The optimum DFS table is selected from the DFS tables. When the frequency changeover switch 20 is switched, the optimum STC table and DFS table are selected according to the switched frequency, and the STC circuit 17 and the DFS circuit 19 are based on the data of the selected STC table and DFS table. Are processed.
[0061]
Therefore, the STC step width can be optimally set by using the STC table corresponding to the used frequency band in the CPM vibrator.
[0062]
As described above, the ultrasonic diagnostic apparatus according to the present embodiment changes the STC table to be used even if there is a broadband probe among the plurality of probes used. In addition, using the necessary DFS circuit and processing based on the data of the optimal STC table and DFS table selected according to the operating frequency of the CPM transducer, the optimal ultrasonic tomographic image is always displayed. can do.
[0063]
As described above, according to the above-described ultrasonic diagnostic apparatus according to the embodiment of the present invention, even if there is a broadband probe among a plurality of used probes, the user However, an optimal ultrasonic tomographic image can be displayed without setting an optimal STC table. According to the present embodiment, it is possible to generate a uniform ultrasonic image from near to far by preparing a table in which an optimal STC curve is preset according to the vibrator to be connected. Thus, an ultrasonic diagnostic apparatus that can be finely adjusted can be realized.
[0064]
The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the present invention.
[0065]
From the above-described embodiment, the configuration described in the following supplementary item is characterized.
[0066]
[Additional notes]
(1) In an ultrasonic diagnostic apparatus capable of connecting a narrowband transducer and a broadband transducer,
Vibrator identifying means for identifying a vibrator connected based on an identification signal for identifying the narrowband vibrator and the broadband vibrator;
Control means for determining whether or not to use a circuit that temporally changes the reception frequency while determining gain data for time control based on the identification result of the vibrator identification means,
An ultrasonic diagnostic apparatus comprising:
[0067]
(2) The gain data is data that changes stepwise.
The ultrasonic diagnostic apparatus according to (1), wherein the control unit changes a change rate of a step-like change in the gain data based on an identification result of the transducer identification unit.
[0068]
(3) Further, the table has a plurality of tables having the gain data, and each of the tables has data in which the gain data changes stepwise according to time. Ultrasound diagnostic equipment.
[0069]
(4) The vibrator identifying means further identifies the frequency characteristic based on a frequency identification signal for identifying the frequency characteristic of the connected vibrator, and the additional items (1) to (3) The ultrasonic diagnostic apparatus in any one of.
[0070]
(5) The ultrasonic diagnostic apparatus according to (4), wherein the control unit switches the table to change the gain data based on the identified frequency characteristic.
[0071]
(6) The superband according to any one of appendices (1) to (5), wherein the narrowband vibrator is a PZT vibrator, and the wideband vibrator is a CPM vibrator. Ultrasonic diagnostic equipment.
[0072]
(7) In an ultrasonic diagnostic apparatus capable of connecting a PZT transducer and a CPM transducer,
Vibrator identifying means for identifying a vibrator connected based on an identification signal for identifying the PZT vibrator and the CPM vibrator;
A control unit that selects a predetermined STC table based on the identification result of the transducer identification unit and selects whether or not to use a DFS circuit;
An ultrasonic diagnostic apparatus comprising:
[0073]
(8) In an ultrasonic diagnostic apparatus to which a narrow-band transducer and a broadband transducer can be connected,
An identification circuit for identifying a narrow-band vibrator and a wide-band vibrator;
A switching circuit for switching the STC table by the identification circuit;
A switching circuit for turning on and off the DFS circuit by the identification circuit;
An ultrasonic diagnostic apparatus characterized in that the rate of change of the STC step width is controlled according to the type of the vibrator.
[0074]
(9) The STC table is characterized in that the change rate of the STC step width when the narrow-band vibrator is connected is larger than that when the wide-band vibrator is connected. The ultrasonic diagnostic apparatus according to (8).
[0075]
(10) The identification circuit, in addition to identifying the types of the narrowband transducer and the broadband transducer, identifies the transducer frequency and switches the STC table based on the identification result. ), The ultrasonic diagnostic apparatus according to the additional item (8) or the additional item (9).
[0076]
【The invention's effect】
As described above, according to the present invention, even if there is a broadband probe among the plurality of probes used, an ultrasonic image that can display an optimal ultrasonic tomographic image can be displayed. An ultrasonic diagnostic apparatus can be realized.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration of an ultrasonic diagnostic apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram for explaining a function of the DFS circuit according to the first embodiment of the present invention;
FIG. 3 is a diagram for explaining DFS table data according to the first embodiment of the present invention;
FIG. 4 is a diagram for explaining an attenuation state of a received signal in the case of the PZT vibrator according to the first embodiment of the present invention.
FIG. 5 is a diagram for explaining an attenuation state of a received signal in the case of the CPM vibrator according to the first embodiment of the invention.
FIG. 6 is a diagram showing a gain setting status in the STC circuit stored in the STC table for the PZT vibrator according to the first embodiment of the present invention.
FIG. 7 is a diagram illustrating a gain setting state in the STC circuit stored in the STC table for the CPM vibrator according to the first embodiment of the present invention.
FIG. 8 is a configuration diagram showing a configuration of an ultrasonic diagnostic apparatus according to a second embodiment of the present invention.
[Explanation of symbols]
1 ... Ultrasonic scope
2. Ultrasonic observation equipment
5. Control unit
6 ... Receiving circuit
15 ... Amplifier
17 ... STC circuit

Claims (3)

In an ultrasonic diagnostic apparatus capable of connecting a narrow band transducer or a broadband transducer,
Vibrator identifying means for identifying a vibrator connected based on an identification signal for identifying the narrowband vibrator and the broadband vibrator;
The first gain data for time control of the narrow-band transducer and the time control of the broadband transducer so as to have a gain change rate smaller than the gain change rate in the first gain data Gain data storage means for storing the second gain data;
When it is identified by the vibrator identifying means that the narrowband vibrator is connected, the first data read from the gain data storage means without using a circuit that temporally changes the reception frequency . Performing gain time control based on gain data, and when the vibrator identifying means identifies that the broadband vibrator is connected, uses a circuit that temporally changes the reception frequency, and Control means for performing time control of gain based on the second gain data read from the gain data storage means ;
An ultrasonic diagnostic apparatus comprising: The first and the second gain data, the ultrasonic diagnostic apparatus according to claim 1, characterized in that each a data changes stepwise. The vibrator identifying means further ultrasonic diagnostic apparatus according to claim 1 or claim 2, wherein the identifying frequency characteristics based on the frequency identification signal identifying the frequency characteristic of the connected oscillator .

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