JPS6024827A - Ultrasonic diagnostic apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ultrasonic diagnostic apparatus for opening blood flow in a living body.

2. Description of the Related Art Structures of Conventional Examples and Their Problems In recent years, medical devices using ultrasonic waves have been actively developed.

One of the above-mentioned devices is one that obtains blood flow information using the pulsed Doppler method.

A device using this method emits ultrasonic pulses in a predetermined direction, detects the phase change of the reflected signal from blood cells at a predetermined position 7113, and processes the information to detect blood flow in real time. It is designed so that you can get the latest news.

A conventional ultrasonic diagnostic apparatus using the pulsed Doppler method will be described below with reference to FIG.

FIG. 1 shows a block configuration of the conventional ultrasonic diagnostic apparatus described above.

In FIG. 1, 11 to 1n are preamplifiers that increase the reflected signal 2 by 1 after emitting ultrasonic pulses to a predetermined region, and 31 to 3n are the gains of the reflected signals amplified by the preamplifiers 11 to 1n, respectively. DGC (Dep
th-Gain, Cot+trol) circuit, 4 is a delay adder that delays and adds the information sent from each DGF circuit 31 to 3n, and outputs the result; 5 is a delay adder 4
D G C (D
epth-Gain-Control) circuit; 6 is a DGC control circuit that controls the DGC circuits 31 to 3n15 by gain control signals 7, 8 and mode control signal 9; 10 is a DGC control circuit; 10 is a DGC circuit 6; 11 is a detection circuit that detects the information amplified by the log amplifier 10 and outputs it to a display device (not shown); 12 is a delay Gain control is performed on the information sent out from the adder 4, and D F T (Discrete *
GC8 (Gain-Cont) outputs to a Fourier @Transformation device (not shown).
rol-Amp, ) circuit.

In the above configuration, the reflected signal 2 is sent to the preamplifier 1.
After the increase rIJ and gain control are performed through the DGC circuits 31 to 3n of 1 to 1n1, the delay adder 4 (-1) delays and adds the information sent from each of the DGC circuits 31 to 3n. Gain control is performed again at 5,
Log amplifier 10. After amplification and detection are performed by the detection circuit 11, the tomographic image or TM image is displayed on a display device.

On the other hand, the information sent from the delayed heating unit 4 to the GCA circuit 12 is amplified and then output to the DFT device, so that desired tonography information can be obtained.

By inputting instructions to the DGC control circuit 6 using control and mode control signals 7, '8, and 9, the DGC circuits 31 to 3n15 perform switching according to normal tomographic image scanning or dosogram signal extraction.

Incidentally, reflected signals from blood cells are much weaker than reflected signals from blood vessel walls or tissue boundaries.

Therefore, in order to obtain Doppler information with good S/N, it is desirable to make the output of the delay adder 4 as large as possible at least in a predetermined portion when extracting Doppler signals, and therefore the gains of the DGC circuits 31 to 3n should be made as large as possible. It needs to be bigger.

However, in Figure 1 (17, 7, ←I',
D G CHi control 1uli+: 36 f-mediated L D G
C circuit 3. ~a, ] Gain control 1, DGC
When the gains of the circuits 31 to 3n are increased, the DGC circuit 5 is also controlled. Therefore, the signal detected by the detection circuit 11 is partially saturated, and the TIVF image of that part has a so-called distorted image, which has the disadvantage that it is difficult to distinguish tissues, etc. .

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides an ultrasonic diagnostic apparatus that obtains good tonographic information even in the trenches where tomographic images or TM images are maintained in a normal state.

Structure of the Invention The present invention includes a first plurality of DGCs (Dep4
h-Gain-Control) circuit, a first DGC control circuit that sets gains for the first plurality of DGC circuits, and respective information 8- A delay adding means for performing μ delay addition to
1 set of benefits U R11l iIl'll i'r? By providing a second DGC circuit and a second DGC control circuit for setting an advantage of 11 to the second DGC circuit, the second object is achieved.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of an ultrasonic diagnostic apparatus according to an embodiment of the present invention.

In FIG. 1, 11 to 1ni-1 are the glianes that amplify the reflected signal 2 after emitting ultrasonic pulses to a predetermined region, and 3° to 3n are the gains of the reflected signals amplified by the preamplifiers 11 to 1n, respectively. DGC (Dep
th轡Ga1n-Control) circuit, 4 is a delay adder that delays and adds the information sent out from each of the DGF circuits 31 to 3n, and outputs the result; 6 is a delay adder that controls the gain of the information sent out from the delay adder 6; DGC (Depth)
-Gain-Control) circuit, 10 is a log 77 circuit that increases the information sent out from the DGC circuit 5.
Amp), 11 is a detection circuit that detects the information increased by the log amplifier 1o and outputs it to a display device (not shown); 12 is a detection circuit that controls the gain of the information sent from the delay adder 4; Discrete*Four
GCA (Gain Control-Amp) output to the ier II Transform) device (not shown).
, ) is a circuit.

The above configuration is similar to that shown in FIG.

2 differs from the configuration shown in FIG. 1 in the respective gain control signals 7A and 7B.

sA, sB and mode control signals 98.

The DGC circuit 3 is controlled by the GC control circuit controlled by 9B.
The point is that gain control is performed from 1 to 3n15.

Referring to FIG. 3 below, DGC circuits 31 to 3n, respectively.
, 5 will be explained.

In FIG. 3, solid lines and broken lines indicate the DCiC circuit 3 in tomographic mode and Doppler mode, respectively.
Gain settings of ˜3.5 and their total gain are shown.

First, in the Doppler mode, while looking at the results shown by the DFT device k, increase the output of -b4 for delay addition to such an extent that good S/H information can be obtained.DGC circuit 31 at this time. The gain of ~3n is (2G1+a) dB (Figure 3 (a)). In this case, the gain of the DGC circuits 31~3n is at least less than the total gain in B mode (Figure 3 (b)), and Gl
By setting the condition that dB (Figure 3 (c)) or more, σ
The range of -G1<a.

shall be. By setting the gain of the DGB circuit 5 to -adB, it is possible to obtain the same total gain as in the B mode. In addition, in the case of such a gain setting, it is possible that a part of the signal may be saturated in the DGC circuits 31 to 3n, but normally there is almost no problem even when θ = 0, and even in Doppler mode, it is almost normal. A TM image similar to that in TM mode can be obtained.

Next, the second gain setting will be explained with reference to FIG.

In order to obtain Doppler information with good S/N using the pulsed Doppler method, only the gain at the sampling site is a problem; it is sufficient to increase the gain only at that site.

In other words, as shown in Figure 4, Sun 19 Fufu 315th W
4 (Actually, considering the time delay q- of the DCiC control circuit 6A in 1), increase the gain jJ by a little more than the sampling point W1 in the range of U and vf2. This gives you a good profit! ) ;Ilj control can be performed.

In other words, in the setting method of this Court 2, when the sampling site is set inside a blood vessel, it is a gas portion, so there is almost no concern about partial saturation of the signal occurring in the DGC circuits 31 to 3n.

Effects of the Invention As described above, the present invention is configured such that the gains of the first plurality of DGC circuits and the second DGC circuit can be set independently and at appropriate values depending on the B mode and the Doppler mode. In addition to being able to obtain a Doppler 1′ signal with good S/N,
It is possible to obtain a TM image that is almost the same as that in the TM mode, and the effect is unique.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional ultrasonic diagnostic device;
The figure is a block wiring diagram of an ultrasonic diagnostic device in an example of the present invention, FIG.
ij1. 171 for explaining the constant force method 7, s
1~an, 6-=・DGC circuit, 4...=J, 'N
't1i: Addition 3'1 circuit, 6A, 6B...D
GC control circuit. Name of agent Patent attorney Toshio Nakao and one other person Indication of procedural amendment 1 case 1985 Patent application No. 13+6781732 Name of invention Ultrasonic diagnostic device Name (582) Matsushita Electric Industrial Co., Ltd. Representative Yama
Toshihiko Shimo Matsushita Electric Industrial Forest Company Specification 1. Title of invention Ultrasonic diagnostic device 2. Claims (1) After emitting ultrasonic pulses to the diagnostic site, gain control of the reflected signals. A first plurality of DGCs (Dept
h, Ga1n, Control) circuit, a first DGC control circuit that sets the gain of the first plurality of D(1,0 circuits), and a second DGC control circuit that sets the gain of the first plurality of DGC gain control circuits. an ultrasonic diagnostic apparatus comprising: a DGC circuit of the second DGG circuit; and a second DGC control circuit of the second DGG circuit (with a setting of I set to 1); (2) a first plurality of DCs; The gain control of the C circuit and the second DGC circuit can be switched by the first DGC control circuit and the second DGC control circuit, respectively, between B mode sugisef and Doppler signal extraction. The ultrasonic diagnostic apparatus according to range 1. (3) The gain of the first plurality of DGC circuits is set to be larger than the gain during B-mode scanning when extracting Doppler signals, and the gain of the second I) GO circuit is set to be larger than the gain during Doppler signal extraction. B during signal extraction
The ultrasonic diagnostic apparatus according to claim 1, wherein the ultrasonic diagnostic apparatus is set to match the 1-tal gain during mode scan. 3. Detailed Description of the Invention Industrial Application Field The present invention is applicable to ultrasonic diagnostic equipment for measuring blood flow in living bodies.
J,! It is something to do. As one of the devices described in "Constitution of Conventional Example and its Problems", there is one that obtains blood flow information by the pulsed Doppler method. A device using this method obtains blood flow information in real time by emitting VC ultrasound pulses in a predetermined direction, detecting phase changes in reflected signals from blood cells at a predetermined site, and processing the information. It is configured as follows. Hereinafter, without reference to FIG. 1, a conventional ultrasonic diagnostic apparatus using the pulsed Doppler method will be described. FIG. 1 shows a block configuration of the conventional ultrasonic diagnostic apparatus described above. In FIG. 1, 13 to 1n are preamplifiers that increase the respective reflected signals 21 to 2n after emitting ultrasonic pulses to a predetermined region, and 31 to 3n are preamplifiers 11, respectively.
D to perform gain control of the reflected signal amplified by ~1n
5 is a DGC (Depth, Ga1n, Control) circuit that performs gain control of the information sent from the delay adder 4; 6 is a gain control signal 7; , 8 and mode 1''. A DGC control circuit controls the DC, G circuits 31 to 3n and 5 using a control signal 9. 1o is a log amplifier (Log, Amp) that amplifies the information sent from the DGC circuit 5. ), 1
1 is a detection circuit that detects the information amplified by the log amplifier 10 and outputs it to a display device (not shown); 12 is a detection circuit that performs gain control of the information sent from the delay adder 4;
T (Discrete, Fourier. Transform) device (not shown) (, CA (Ga1n, Control, Amp
, ) is a circuit. In the above configuration, the reflected signals 21 to 2n are amplified and gain controlled via the preamplifiers 14 to 1n and the DGC circuits 31 to 3n, and then are output from the respective DGC circuits 31 to 3n by the delay adder 4. Add the information to be sent out with a delay. The information is gain controlled again in the DGC circuit 6, amplified and detected in the log amplifier 10° detection circuit 11, and then the tomographic image (B mode) or TM image is displayed on the display device. The information sent from the adder 4 to the GCA circuit 12 is amplified and then output to the DFT device. Desired Doppler information can be obtained. And control and control the DGC control circuit 6! - By giving an instruction using the roll signals 7, 8.9, the DGC circuits 31 to 3n, 6 perform switching according to AN tomographic image scanning (B mode scanning) or Doppler signal extraction. Incidentally, reflected signals from blood cells are much weaker than reflected signals from blood vessel walls or tissue boundaries. In order to obtain good S/H Dotsupura information,
When extracting Doppler signals, it is desirable to make the output of the delay adder 4 as large as possible at least at a predetermined portion, and therefore it is necessary to make the gains of the DGC circuits 31 to 3n as large as possible. However, in the configuration shown in FIG. 1 described above, the DC, G control circuit 6
Gain control of the DGC circuits 31 to 3n is performed via D
When the gains of the GC circuits 31 to 3n are increased, I) GC0
The circuit is also controlled. Therefore, the signal detected by the detection circuit 11 is partially saturated, and the TM image of that part has the disadvantage that the picture is blurred, making it difficult to distinguish tissues, etc. . OBJECTS OF THE INVENTION In view of the above drawbacks, the present invention provides an ultrasonic diagnostic apparatus that obtains good Doppler information while maintaining a tomographic image or a TM image in a normal state. Structure of the Invention The present invention provides a first plurality of D G G (D
epth, Ga1n, Control) circuit, a first DC, C control circuit that sets the gain of the first plurality of DGC circuits, and a delay of each information sent from the first plurality of DGC circuits. a delay adder that performs addition; a second DCTC circuit that performs gain control of information sent from the delay adder; and the second DG.
The above object is achieved by providing the C circuit with a second DGC control circuit that sets the gain. DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of an ultrasonic diagnostic apparatus according to an embodiment of the present invention. In Fig. 1, 11 to 1n are preamplifiers that amplify the reflected signals 21 to 2n after emitting ultrasonic pulses to a predetermined region, and 31 to 3n are the reflections amplified by the preamps 11 to 1n, respectively. Let's perform Shinzuki's gain control D (
:x G (Depth, Ga1n, Contr
ol) circuit, 4 is a delay adder that delays and adds the information sent out from each of the DGC circuits 31 to 3n, and outputs the result; 5 is a circuit that performs gain control of the information sent out from the delay adder 6 D; GC (Depth, Ga1n. Control) circuit, 1o [Log amplifier (Log, Amp) that amplifies the information sent out from the Dec circuit 5
, 11 is a detection circuit that detects the information amplified by the log amplifier 1o and outputs it to a display device (not shown); 12 is a detection circuit that performs gain control of the information sent from the delay adder 4;
G output to an F T (Discrete, Fourier. Transform) device (not shown)
C;A(Ga1n, Control, Amp,
) is a circuit. The above configuration is similar to the configuration shown in FIG. The difference in the configuration shown in FIG. 2 from that shown in FIG. 1 is that each gain control signal -';f! ; 7 A +
7B +8A, 8B and mode control signal 9
17 by the DGC control circuit controlled by A r9B.
This is the point at which gain control of the DC, C circuits 31 to 3n and 5 is performed. Referring to FIG. 3 below, DGC circuits 31 to 3n, respectively.
, 6 will be explained. In addition, in FIG. 3, the solid line and the broken line indicate the DGC circuit 31 in the tomographic image mode and the Doppler mode, respectively.
~3n, 5 gain settings and their total gains are shown. In the unswitched Doppler mode, the output of the delay adder 4 is increased to the extent that Doppler information with a good S/N ratio can be obtained while observing the results shown by the DFT device. The gain of the DGC circuits 31 to 3n at this time is (2GH+
a) dB (Figure 3 (b)). In this case, DC
, C circuits 31 to 3n gain is at least below the total gain in B mode (Fig. 3 (a)), and G, dB
(Figure 3 (c)) Setting the above conditions, the range of α is set to −G1<α×Q. By setting OI(# of the DGC circuit 6 to -αdB, it is possible to obtain the same total gain as in B mode.In addition, in the case of such a gain setting, D
It is possible that a part of the signal may be saturated in the C and C circuits 31 to 3n, but normally there is almost no problem even in the case of α-Q, and in Doppler mode it is almost the same as in normal TM mode. It is possible to obtain TM images. Next, referring to Section 4 and 1, the second advantage will be explained. Pulse Doppler method provides Doppler information with good S/N (
Since only the gain at the sampling site is a problem, it is sufficient to increase the gain only at that site. That is, as shown in FIG. 4, the sampling site W+(
In practice, good gain control can be achieved by increasing the gain by an amount (in practice, taking into account the time delay of the DGC control circuit 6A, etc., the gain is increased over the range of W2, which is slightly wider than the sampling portion W1). In particular, in the setting method of this Court 2, when the sampling site is set inside a blood vessel, the reflection level is extremely low, so there is almost no concern about partial saturation of signals occurring in the DGC circuits 31 to 3n. Effects of the Invention As described above, the present invention sets the gains of the first plurality of DGC circuits and the second DGC circuit to the tomographic image (B mode) and the Doppler mode, and sets the gains of each node τ independently and appropriately. By configuring it so that it can be set, it is possible to obtain Doppler information with a good S/N in Doppler mode, and also to obtain a TM image that is almost the same as that in TM mode 111j, which has a unique effect. 4. Brief explanation of the drawings Figure 1 is a block diagram of a conventional ultrasonic diagnostic device, Figure 2 is a block diagram of a conventional ultrasound diagnostic device.
The figure is a block diagram of an ultrasonic diagnostic apparatus according to an embodiment of the present invention, and FIGS. 3 and 4 are diagrams for explaining a gain setting method of the apparatus. 31-3n, 5...DGC circuit, 4...
-Delay addition circuit, 6A, 6B...DGG control circuit.

Claims (1)

[Claims] 0) A first plurality of DGCs (Dep'th
-Gain, -Con(rol) circuits, a first DGC control circuit that sets the gains of the first plurality of DGC circuits, and delays of respective information sent from the first plurality of DGC circuits. a delay addition means for performing addition; a second DGC circuit for controlling the gain of information sent from the delay addition means; and a second I) GC control circuit for setting the gain of the second DGC circuit; Ultrasonic diagnostic equipment equipped with (2) First complex I) GC circuit and second DCiC
A patent characterized in that the control of the J circuit can be switched to the first DGC control circuit and the second DGCfl+IJ control circuit at the time of upper circuit mode scanning and at the time of Doppler signal extraction, respectively. An ultrasonic diagnostic apparatus according to claim 1. (3) The gain of the first plurality of DGC circuits is set to be larger than the gain during B mode scanning when extracting Doppler signals, and the gain of the second DGC circuit is set to be larger than the gain during B mode scanning when extracting Doppler signals.
The ultrasonic diagnostic apparatus according to claim 1, wherein the "Jj rut" is set to match the 1-tal gain of the modes Gian 11, 5.