JPH04307364A - Ultrasonic diagnostic apparatus - Google Patents

Abstract

PURPOSE:To perfectly remove a noise signal by extracting the respective address data of a frame, a raster and a focus and storing and renewing the noise signal by a predetermined raster address. CONSTITUTION:A desired delay time is given to the echo signal from an object to the inspected by a receiving phasing circuit 3 to be subjected to phasing addition. A noise signal of a desired address is stored in a noise removing circuit 4 by the predetermined addresses of a frame, a raster and a focus. Herein, the noise signal corresponding to the address obtained by the echo signal is read to be subtracted and the noise signal component contained in the echo signal is removed. A noise removing control circuit 7 extracts respective address data from a frame signal X1, a raster signal Y1 and a focus signal F1 to control the circuits 3, 4 so as to perform desired noise signal removing processing and controls a digital scanning converter 6 so as to perform image blanking and interpollation during a noise signal memory period.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic diagnostic apparatus with noise removed, such as an electronic scanning ultrasonic diagnostic apparatus and a non-destructive testing apparatus.

0002

[Prior Art] Conventionally, ultrasonic waves are transmitted to a subject from an array type probe composed of arrayed transducers, and echoes from various reflection points inside the body are received by a receiving element. ,
Processing such as time delay, phasing addition, and noise removal is performed to convert the time required from transmitting to receiving waves into distance, and the echo intensity is displayed as an image by brightness modulation. Diagnosis is being carried out. The noise generated in this case is more likely to be generated by the diagnostic device than from within the body. As a conventional noise removal method, for example, there is a method described in the specification and drawings of Japanese Patent Application No. 1-82336. According to this method, one frame worth of noise signal is removed in the first frame. This is stored, and in subsequent frame processing, the stored noise signal is read out and used to perform subtraction from the echo signal to remove noise.

0003

[Problem to be Solved by the Invention] However, in the conventional method, no consideration was given to the fact that the noise signal changes over time due to changes in temperature, changes in power supply voltage, intrusion of external noise, etc. . That is, as in the conventional method, the noise signal is stored in the first frame, and when processing subsequent frames, the noise signal of the first frame is read out, and the noise signal is extracted from the echo signal. If a noise different from that in the first frame is mixed in by only the process of subtracting the signal, it will not be removed, and the noise signal will be displayed on the image. As mentioned above, noise is often generated from diagnostic equipment, and the noise generated by the equipment changes between the first frame and subsequent frames due to changes in temperature or power supply voltage. Further, noise may be mixed into the echo signal from other devices. Therefore, since there is a large difference between the stored noise signal and the noise signal contained in the echo signal, there is a problem in that the removal of the noise signal is incomplete and the noise signal is displayed on the image. The purpose of the present invention is to solve these conventional problems and to provide an ultra-high-performance ultra-high-speed optical system that can completely remove noise signals even if the noise signals change over time due to changes in temperature, power supply voltage, or the intrusion of external noise. The purpose of the present invention is to provide a sonic diagnostic device.

0004

[Means for Solving the Problems] In order to achieve the above object, the ultrasonic diagnostic apparatus of the present invention includes (a) an array type probe composed of arrayed transducers, and each transducer of the probe. From the output of the wave transmitting circuit that transmits waves with a predetermined delay time, the wave receiving phasing circuit that adds a predetermined delay to the echo signals obtained by the array transducer and phasing them, and the output of the wave receiving phasing circuit. a noise removal circuit that subtracts a pre-stored noise signal; a signal processing circuit that performs signal processing for image reproduction on the output of the noise removal circuit;
Equipped with a digital scan converter that stores the output signal of the signal processing circuit and performs processing for image reproduction, and an image display circuit that displays the output of the digital scan converter, it sends and receives ultrasound signals to and from the subject. In an ultrasonic diagnostic apparatus that obtains ultrasound images by sector-scanning an ultrasound beam, a frame corresponding to one period of sector scanning, a raster corresponding to one sector scanning, and an echo are used. Extracts each focus address information according to the attention distance of the signal,
The reception phasing circuit and the noise removal circuit are controlled so that the noise signal is stored and updated at a predetermined raster address, and the raster address for storing the noise signal is moved every frame. A feature of the present invention is that it includes a noise removal control means for controlling the digital scan converter so as to blank the image or display a corrected image during the signal storage period. In addition, (b) extracts the focus address information according to the attention distance of the frame, raster, and echo signal by sector scanning, and stores the noise signal at a predetermined focus address. The reception phasing circuit and the noise removal circuit are controlled so as to update and move the focus address for storing the noise signal for each frame or for each focus, and also for the storage period of the noise signal. Another feature of the present invention is that it includes a noise removal control means for controlling a digital scan converter so as to display a blanked image or an interpolated image. (c) Frame, raster, and focus address information according to the attention distance of the echo signal are extracted by sector scanning, and a predetermined frame address and an arbitrary frame are extracted. The reception phasing circuit and the noise removal circuit are controlled so that the noise signal is stored and updated at each frame address after the number of frames, and the image blanking or interpolated image is displayed during the storage period of the noise signal. Another feature of the present invention is that it includes a noise removal control means for controlling the digital scan converter. Furthermore, (d) the receiving phasing circuit is equipped with a changeover switch that grounds the input of the delay element that makes up the receiving phasing circuit during the period when the noise signal is stored and updated. be.

[0005]

In the present invention, frame, raster, and focus address information is extracted, and the noise signal is stored and updated using any of these addresses. That is, when imaging a subject by, for example, fan-shaped scanning, one frame of signals is composed of rasters Y1 to Yn in FIG. This is the first aspect of the present invention. Furthermore, in wave reception, a plurality of focus areas (F1, F2, F3 in FIG. 5) are set from the shallow part to the deep part of the body. Therefore, as a second invention, it is possible to move the focus address for storing the noise signal at a predetermined focus address and for each frame or raster to update the memory. We propose a control circuit and a noise removal circuit. As a third invention, we propose a method in which a noise signal is stored in a frame at a predetermined address and after an arbitrary number of frames. In this way, the memory of the noise signal is updated not only once but sequentially, so even if the noise signal changes over time due to changes in temperature, power supply voltage, or the introduction of external noise, the memory of the noise signal will not be updated. is completely removed.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. FIG. 2 is a block diagram showing an example of a device configuration using the present invention. In Fig. 2, 1 is an array type probe, 2 is a wave transmitting circuit that sends a drive signal for transmitting ultrasonic signals, and 3 is a wave receiving conditioning circuit that receives echo signals and forms a beam. a phase circuit; 4 is a noise signal removal circuit for removing noise signals; 5 is a signal processing circuit that performs signal amplification, logarithmic compression, detection, etc.; 6 is a digital scan converter that performs image interpolation; 7 is a Receiving circuit 3, noise signal removal circuit 4
, and a noise removal control circuit that controls each circuit by supplying control signals generated to the digital scan converter 6, 8 is an image display circuit for displaying an image, X1 is a frame signal, Y1 is a raster signal, and F1 is a focus signal.

The signal flow in FIG. 2 will be briefly explained. By driving each vibrator that constitutes the array type probe 1 with the wave transmitting circuit 2, an ultrasonic signal is transmitted into the subject. The echo signals from the object received by each transducer of the array type probe 1 are given a desired delay time in a wave reception phasing circuit 3, and are phased and summed. The output of the receiving wave phasing circuit 3 is input to the noise removal circuit 4. At this time, the noise removal circuit 4 stores a noise signal at a desired address using predetermined addresses of frame, raster, and focus. In the noise removal circuit 4, the noise signal corresponding to the address from which the echo signal was acquired is read out and echoed.
Subtracted from the signal. As a result, the noise signal contained in the echo signal is removed. The output of the noise removal circuit 4 is subjected to signal processing such as amplification processing for image reproduction, logarithmic compression processing, detection processing, and edge enhancement processing in the signal processing circuit 5, and is then sent to the digital scan converter 6. is input. The digital scan converter 6 performs scanning format conversion, data interpolation, and designation of the image display area for visualization, and the processed ultrasound image is displayed on the image display circuit 8. Ru. Further, the noise removal control circuit 7 extracts each address information from the frame signal X1, the raster signal Y1, and the focus signal F1, and controls the reception phasing circuit so that the desired noise signal removal processing is performed. 3 and the noise removal circuit 4, and also controls the digital scan converter 6 to perform image blanking or image interpolation during the storage period of the noise signal.

FIG. 1 is a detailed configuration diagram showing an embodiment of the noise removal control circuit shown in FIG. 2. In FIG. In FIG. 1, 71
72 is a frame count number setting circuit, 72 is a raster count number setting circuit, 73 is a focus count number setting circuit, 74 is a frame count circuit, 75 is a raster count circuit, 76 is a focus count circuit, 77, 78 is memory, X1 and X0 are frame signals, Y1 and Y0 are raster signals, F1 and F0 are focus signals, M is a mode signal, P is a probe signal, and C1 to Cn are delay control signals. be. A mode signal M indicating each type of mode and probe to be used and a probe signal P are sent to each count number setting circuit 71.
73 and the memory 77, the respective count number setting circuits 71 to 73 to each count circuit 7
4 to 76, clear the count values and restart.
The number of times to count is set. After the count number is set, the frame signal X1 indicating the frame switching point, the raster signal Y1 indicating the raster switching point, and the focus signal F1 indicating the focus switching point are sent to each counting circuit. 74 to 76, respectively. Thereby, the count circuits 74 to 76 start counting and sequentially increment the count number by 1 until the set value is reached. Then, when each of the counting circuits 74 to 76 reaches a set value, it resets the count number and starts counting again. From then on, switch modes and
The counting operation is performed repeatedly using the same set value until the type of tab is switched.

The memory 77 includes each count circuit 74 to 76.
Each address information output from the
Outputs the previously stored focus signal F0, raster signal Y0, and frame signal X0 according to the read signal M and the probe signal P, and specifies the state of storage and readout of the noise signal. Outputs write enable signal WE. Further, the memory 78 generates signals C1 to Cn for delay time control in the wave reception phasing circuit 3 in response to the raster signal Y0 and the focus signal F0. The reception phasing circuit 3, noise removal circuit 4, and digital scan converter 6 in FIG. Signal F0, raster signal Y0,
It receives all or part of the frame signal X0 and is controlled based on this. In addition, the count number setting circuit 71~
73, memory 77, and memory 78 can be realized by, for example, a ROM (Read Only Memory). Also, for example, the frame address is 8 bits, the raster address is 8 bits, the focus address is 4 bits, the mode signal M is 4 bits, and the probe signal P is 4 bits.
Assuming that the memory 77 is configured with 4 bits and the write enable signal WE is 1 bit, the input to the memory 77 will be 28 bits and the output will be 17 bits, and a single ROM will not have enough input/output pins. . Therefore, memory 7
7 may be configured with a plurality of ROMs, and a multiplexer may select the ROM to be used.

FIG. 3 is a block diagram showing an embodiment of the receiving phasing circuit shown in FIG. 2. In FIG. In FIG. 3, E1 to En are echo signals received by each transducer of the probe 1, S1 is a switch, D1 to Dn are delay elements that time delay the echo signals E1 to En, and Σ is an adder. It is. Control for noise removal on the reception phasing circuit 3 is performed using the write enable signal WE and the delay control signal C generated by the noise removal control circuit 7.
1 to Cn. That is, the write enable signal WE is input to the switch S1, and the delay control signal C
1 to Cn are input to delay elements D1 to Dn, respectively. Echo signals E1 to En from each wave receiving element are input to delay elements D1 to Dn, respectively, where delay processing is performed. The outputs are added by an adder Σ and the received wave phasing circuit 3
The output is Now, the write enable signal WE is low.
When the echo signals E1 to En are at the switch S
1 to delay elements D1 to Dn. Delay element D
1 to Dn, a predetermined time delay for displaying an image is performed by delay control signals C1 to Cn. Each of the delayed echo signals E1 to En is input to an adder Σ, where they are added together and then output to the noise removal circuit 4. The added echo signal also includes a noise signal. Next, when the write enable signal WE is at a high level, the inputs of the delay elements D1 to Dn are grounded via the switch S1. In the delay elements D1 to Dn, a predetermined time delay is performed by the delay control signals C1 to Cn to store the noise signal, and the noise signal at the time of focus switching and the offset difference of the delay elements D1 to Dn are generated as noise. It is output to the removal circuit 4. A memory for storing these noise signals is provided in the next stage noise removal circuit 4. Note that the offset difference is a difference output when a DC signal of a fixed level exists even when there is no noise signal. Furthermore, at the time of focus switching, switching noise is generated in the delay elements D1 to Dn in addition to the noise signal included in the echo signal, so this noise is transferred to the memory of the noise removal circuit 4 in the next stage. Remember.

FIG. 4 is a block diagram showing one embodiment of the noise removal circuit in FIG. 2. In FIG. In FIG. 4, 41 is a noise storage circuit, 42 is a differential amplifier circuit, and WE, Y0, F0 are control signals generated by the noise removal control circuit 7. The storage/reading of the noise storage circuit 41 of the noise removal circuit 4 is controlled by the write enable signal WE, raster signal Y0, and focus signal F0 of the noise removal control circuit 7. In the receiving wave phasing circuit of FIG. 3, for example, when the write enable signal WE is at a high level, the inputs of the delay elements D1 to Dn are grounded, and the noise signals at the time of focus switching and the delay elements D1 to Dn are grounded. The offset difference, etc. of the receiving wave phasing circuit 3
The signal is output from the circuit and input to the noise removal circuit 4 at the next stage. Then, in the noise removal circuit 4, when the write enable signal WE is at a high level, the input noise signal is stored in a predetermined address of the noise storage circuit 41 specified by the raster signal Y0 and the focus signal F0. be done. On the other hand, when the write enable signal WE is at a low level, the contents of the noise storage circuit 41 at the same address as the address where the echo signal specified by the raster signal Y0 and the focus signal F0 was obtained are read out. Then, the noise signal is subtracted from the echo signal in the differential amplifier circuit 42 to perform noise removal processing.

FIG. 5 is an explanatory diagram of an example of control in a digital scan converter. Here, an example of control of the digital scan converter 6 by the noise removal control circuit 7 is shown using a sector image displayed on the image display circuit 8 as an example. In FIG. 5, Y1 to Yn are raster addresses, F1 to F3 are focus addresses, and TY is a raster period, and the numbers 1 to n indicate that the younger number can be obtained earlier in time. It shows. By controlling the digital scan converter 6 by the noise removal control circuit 7, the digital scan converter 6 is configured to display the image of the noise signal in the image display circuit 8 while the noise signal is stored in the noise removal circuit 4. Blanking the image so that it does not appear in the image. Alternatively, interpolated data is created using adjacent rasters, past data, etc., and this is displayed as an image for that period. For example, assuming that raster address Y1 is the storage period of a noise signal, raster addresses Y2 to Yn
A normal image is displayed during the period, but the raster address Y
The image is blanked only during period 1, or an image based on interpolated data is displayed only during that period. Although the period of the raster address Y1 is set as the storage period of the noise signal, it is also possible to set only the period of the focus F1 of the raster address Y1 as the storage period of the noise. In that case,
An image is displayed only during the periods of focus addresses F2 and F3, and the image is blanked during the period of F1, or an image based on interpolated data is displayed only during that period.

FIG. 6 is a time chart of noise removal showing an example of control in which the first raster Y1 of each frame is used as the storage period of the noise signal. In FIG. 6, X1 to X
4 is a frame address, TX is a frame period, W is a storage period of a noise signal, R is a read period of a noise signal, and YA is a raster address at which a noise signal is stored and read. As is clear from FIG. 6, in frame X1, the noise signal of raster Y2 is stored in the noise storage circuit 41, and
In frame X2, the noise signal of raster Y3 is stored, and in frame X3, the noise signal of raster Y4 is stored.
1 is stored. When this storage period W (enable signal WE is at a high level) ends, a noise signal readout period R (enable signal WE is at a low level) continues, and during this period R, the image display circuit 8 The noise signal of the raster address displayed in is read out from the noise storage circuit 41, and the noise is removed. Here, the image during the period of time TY during which storage is performed is blanked in the digital scan converter 6 and is not displayed on the image display circuit 8. In addition, in FIG. 6, the storage control of the noise signal is explained as being performed in the first raster of each frame, but the present invention is not limited to this, and the storage control of the noise signal is performed in the first raster of each frame. It is also possible to store and update the noise signal in an area and timing equivalent to an arbitrary raster, an arbitrary raster in an arbitrary frame, or a plurality of rasters in an arbitrary frame.

FIG. 7 is a time chart of noise removal showing an example of control in which a desired focus area of each raster is set as a storage period of a noise signal. In FIG. 7, Y1
-Y4 are raster addresses, F11-F43 are focus addresses in each raster, and the two-digit numbers indicate the raster address on the left and the focus address on the right. Further, FH1 to FH4 are interpolation data, TF is the time of the focus area, and FA (F11 to FH4) is the focus address where the noise signal is stored and read out. An example of a two-digit number is a raster address, the right one shows the focus address. As is clear from FIG. 7, in the first frame, the noise signal F13, which is the area of focus F3 in raster Y1, is stored in the noise storage circuit 41, and the noise signal of F13, which is the area of focus F3 in raster Y2, is stored in the noise storage circuit 41. The noise signal of F22 is stored, the noise signal of F31 in the area of focus F1 is stored in raster Y3, the noise signal of F43 in the area of focus F3 is stored in raster Y4, and so on. The noise signal is stored in the noise storage circuit 41 while sequentially moving the raster address and focus address for storing the noise signal. FIG. 7 shows the case of the first frame, and in the next second frame, the focus address is moved and the focus address F11, which is the area of focus F1 in raster Y1, is moved in the same way. The noise signal is stored in the noise storage circuit 41, the noise signal of F23 which is the area of focus F3 is stored in raster Y2, the noise signal of F33 which is the area of focus F3 is stored in raster Y3, and the noise signal of F33 which is the area of focus F3 is stored in raster Y3. The noise signals are sequentially stored so that the noise signal of F41, which is the area of focus F1, is stored in Y4. During the readout period R excluding the storage period W of each raster, the noise signal of the focus address displayed on the image display circuit 8 is read out from the noise storage circuit 41 and noise removal is performed. Here, for the image during the storage time TF, interpolated data is created from adjacent rasters of each raster in the digital scan converter 6, and the interpolated data is sent to the image display circuit 8.
are displayed as data FH1 to FH4. The interpolated data is created, for example, as FH2=(F12+F32)/2.

In FIG. 7, it has been explained that the noise signal is stored in the desired focus area of each raster and the interpolated data is displayed, but the present invention is not limited to this, and each Part of the desired focus area of a raster, the desired focus area of any raster, or any frame.
Memory update of the desired focus area of each raster of the system, a part of the desired focus area of each raster, the desired focus area of any raster, and a noise signal in a similar area and timing. It is possible to do this. Furthermore, if interpolation is not required, it is of course not necessary to create interpolated data. In the example explained with reference to FIGS. 6 and 7, the noise signal is stored at the same timing of focus switching or raster switching as when an image is displayed. Therefore, it is expected that the memory capacity for storage will be enormous. Therefore, we focused on the fact that the period in which the noise signal occurs is a short period of time immediately after the focus is switched, and that the offset noise signal generated by the delay element or other factors is constant within the same focus area. However, the noise signal is stored using thinned samples from a small section immediately after the focus is switched and any small section in the same focus area where no noise occurs, and when read out, time is expanded to store the noise signal. There are several ways to remove it. This method will be explained with reference to FIG.

FIG. 8 is a time chart of noise removal showing an example of control in which only a desired minute region of each raster is set as the storage period of the noise signal. In FIG. 8, N is a noise signal, N11 to N13 are generation sections of switching noise signals generated by each focus switching, and OF11 to N13 are generation sections of switching noise signals generated by each focus switching.
OF13 is a section of an offset noise signal generated by a delay element or other factors, ND is a time-reduced noise signal, and τ is a time-reduced noise signal period. As is clear from FIG. 8, the sample sections of the noise signal N11, OF11, N
By storing only the six locations of No. 12, OF12, N13, and OF13, the noise signal N becomes a time-reduced noise signal ND. The time of the noise signal ND is τ, and if storage and reading are performed at the same sampling time, the memory capacity can be reduced to τ/TY. In addition,
In order to shorten the storage time, it is conceivable to perform the focus switching at a higher speed than the normal switching timing.

FIG. 9 is a time chart of noise removal that is effective when the frame rate is very fast. In FIG. 9, X0 (X1 to X12) is the frame address, W
E is a write enable signal, XA (X1 to X12) is a frame address where an image is displayed, XH is an interpolation data display section of the frame, and BL is a section where no image is displayed. Here, the noise signal is stored only in each frame of X1, X6, and X11, and during that period, blanking BL or interpolated image display XH is performed. Other phrases
The system only reads the noise signal and performs noise removal processing. For example, if the frame rate is 30 frames/
If the time is very fast, such as seconds, the
Here, even if frame data interpolated only once every five frames is displayed, a comparable interpolated image can be obtained. Utilizing this, noise signals are stored in frames at once, and interpolated data is displayed between them. In this way, it becomes possible to simplify the complicated noise removal control.

In the embodiment, the acquisition of initial noise signal data at power-on or mode switching was not particularly explained, but as shown in FIG.
It is desirable that the system memorize all noises made when the system is turned on or when switching modes.

[0019]

[Effects of the Invention] As explained above, according to the present invention,
Even in sector scanning of ultrasound diagnostic equipment, noise signal memory is updated for each predetermined raster, focus, or frame. Therefore, even if the noise signal changes over time, all the noise signal can be removed, and the noise will not be displayed on the screen.

[0020]

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a noise removal control circuit showing an embodiment of the present invention.

FIG. 2 is an overall block diagram of an ultrasonic diagnostic apparatus using the present invention.

FIG. 3 is a configuration diagram showing an example of a receiving phasing circuit in FIG. 2;

FIG. 4 is a configuration diagram showing an example of the noise removal circuit in FIG. 2;

5 is a diagram illustrating an example of control of the digital scan converter in FIG. 2. FIG.

FIG. 6 is a time chart of noise removal according to the present invention (when a noise signal is stored at a predetermined raster address for each frame).

FIG. 7 is a time chart of noise removal according to the present invention (in the case of storing noise signals with focus addresses in a predetermined order for each raster).

FIG. 8 is a time chart of noise removal according to the present invention (in the case where only a desired minute region of each raster is set as the storage period of the noise signal).

FIG. 9 is a time chart of noise removal according to the present invention (when a noise signal is stored only in a predetermined frame).

[Explanation of symbols]

1 Array probe 2 Wave transmitting circuit 3 Receiving (phasing) circuit 4 Noise removal circuit 5 Signal processing circuit 6 Digital scan converter 7 Noise removal control circuit 8 Image display circuit X1, X0 Frame signal Y1, Y0 Raster signals F1, F0 Focus signal 71 Frame count number setting circuit 72 Raster count number setting circuit 73 Focus count number setting circuit 74 Frame count number setting circuit 75 Raster count circuit 76 Focus count circuits 77, 78 Memory M Mode signal P Probe signal C1-Cn Delay control signal E1-En Echo signal S1 Switch D1-Dn Delay element Σ Adder 41 Noise storage circuit 42 Differential amplifier circuit

Claims (4)

[Claims] [Claim 1] An array type probe composed of arrayed transducers, a wave transmitting circuit that drives each transducer of the probe to transmit waves at a predetermined delay time, and A receiving phasing circuit that adds a predetermined delay to an echo signal and phasing it; a noise removing circuit that subtracts a pre-stored noise signal from the output of the receiving phasing circuit; and an output of the noise removing circuit. a signal processing circuit that performs signal processing for image reproduction; a digital scan converter that stores the output signal of the signal processing circuit and performs processing for image reproduction; and an output of the digital scan converter. Equipped with an image display circuit that displays
In an ultrasonic diagnostic apparatus that transmits and receives ultrasonic signals to and from a subject and obtains an ultrasonic image by scanning the ultrasonic beam in sectors, a frame that corresponds to one cycle of the sector scanning is used. The raster corresponding to one scan and the focus address information corresponding to the attention distance of the echo signal are extracted, and the noise signal is stored and updated at a predetermined raster address, and is updated every frame. The receiving phasing circuit and the noise removal circuit are controlled to move the raster address for storing the noise signal, and the digital scan is performed to blank the image or display a corrected image during the storage period of the noise signal. An ultrasonic diagnostic apparatus characterized by having a noise removal control means for controlling a converter. [Claim 2] An array type probe composed of arrayed transducers, a wave transmitting circuit that drives each transducer of the probe to transmit waves at a predetermined delay time, and A receiving phasing circuit that adds a predetermined delay to an echo signal and phasing it; a noise removing circuit that subtracts a pre-stored noise signal from the output of the receiving phasing circuit; and an output of the noise removing circuit. a signal processing circuit that performs signal processing for image reproduction; a digital scan converter that stores the output signal of the signal processing circuit and performs processing for image reproduction; and an output of the digital scan converter. Equipped with an image display circuit that displays
In an ultrasound diagnostic device that transmits and receives ultrasound signals to and from a subject and obtains ultrasound images by sector-scanning the ultrasound beam, attention is paid to frames, rasters, and echo signals resulting from the sector-scanning. A format that extracts each focus address information according to the distance, stores and updates the noise signal at a predetermined focus address, and stores the noise signal for each frame or each focus. - The digital scan converter controls the reception phasing circuit and the noise removal circuit so as to move the signal address, and displays the image blanking or interpolated image during the storage period of the noise signal. An ultrasonic diagnostic apparatus characterized by having a noise removal control means for controlling. [Claim 3] An array type probe composed of arrayed transducers, a wave transmitting circuit that drives each transducer of the probe to transmit waves at a predetermined delay time, and A receiving phasing circuit that adds a predetermined delay to an echo signal and phasing it; a noise removing circuit that subtracts a pre-stored noise signal from the output of the receiving phasing circuit; and an output of the noise removing circuit. a signal processing circuit that performs signal processing for image reproduction; a digital scan converter that stores the output signal of the signal processing circuit and performs processing for image reproduction; and an output of the digital scan converter. Equipped with an image display circuit that displays
In an ultrasound diagnostic device that transmits and receives ultrasound signals to and from a subject and obtains ultrasound images by sector-scanning the ultrasound beam, attention is paid to frames, rasters, and echo signals resulting from the sector-scanning. The above method extracts each focus address information according to the distance and stores and updates the noise signal at a predetermined frame address and at each frame address after an arbitrary number of frames. The present invention further includes noise removal control means for controlling the reception phasing circuit and the noise removal circuit, and for controlling the digital scan converter so as to display image blanking or an interpolated image during the storage period of the noise signal. Features of ultrasonic diagnostic equipment. 4. The ultrasonic diagnostic apparatus according to claim 1, claim 2, and claim 3, wherein the wave receiving phasing circuit is configured to be configured such that the wave receiving phasing circuit does not operate during a period in which the noise signal is stored and updated. 1. An ultrasonic diagnostic apparatus comprising a changeover switch for switching an input of a constituent delay element to ground.