JP5100087B2 - ECG signal detection apparatus and ultrasonic diagnostic apparatus - Google Patents

Description

  The present invention relates to an electrocardiogram signal detection apparatus and an ultrasonic diagnostic apparatus. More specifically, the present invention has a synchronization mode in which an image is displayed in synchronization with a biological signal (electrocardiographic waveform), and the biological signal is displayed on the image. It is used for the electrocardiogram signal detection apparatus and ultrasonic diagnostic apparatus which are displayed on the screen.

  A conventional ultrasonic diagnostic apparatus has a synchronization mode for displaying an image in synchronization with a biological signal (electrocardiographic waveform) as reference information to assist diagnosis by an ultrasonic image, and a function for displaying the biological signal Some have In addition, an ultrasonic diagnostic apparatus may be used to obtain an image useful for diagnosis, such as starting or stopping scanning of an ultrasonic image in synchronization with a heartbeat. The unit for detecting a biological signal is an optional function and is a separate unit from the apparatus.

  The biological signal (electrocardiogram signal) displays the dynamic movement of the patient's heart, and it is essential for an ultrasonic diagnostic apparatus for a circulatory organ to take an ultrasonic image synchronized with the movement of the heart. It is a function.

  The electrocardiogram signal includes a QRS signal synchronized with the end diastole of the ventricle. Various diagnostic modes synchronized with the QRS signal have been developed. Analysis of ECG synchronization is important in the cardiovascular region, and various new ECG synchronization modes (TDI, TDI-Q, stress echo method, contrast echo method, etc.) have been developed.

An ultrasonic diagnostic apparatus that simultaneously displays an ultrasonic diagnostic image obtained in the electrocardiographic synchronization technique and an electrocardiographic waveform in the same phase is described in Patent Document 1, for example.
JP 2001-292993 A

  However, since the electrocardiographic signal changes due to the dynamic movement (a slight movement) of the patient, the electrocardiographic synchronization signal may not be detected well. Therefore, since it is necessary to wait until the electrocardiogram waveform is stabilized as much as possible, it takes time for diagnosis. That is, if the electrocardiogram synchronization is not successful, the re-examination is performed and it takes time, so that it is difficult to apply to the routine examination.

  In recent years, there is a case where the ultrasonic transmission drive voltage is controlled by electrocardiographic synchronization in the contrast echo method in which a contrast contrast agent is injected. The contrast enhancement effect of the contrast medium is as short as about 5 minutes, and in the reinfusion of the drug, the dose per dose is limited due to side effects on the drug, and the number of doses per test is also limited to 3 times. Therefore, it is necessary to stabilize the ECG waveform as much as possible. In addition, there is a problem that the patient burden (cost) is large when administered multiple times.

  As shown in FIG. 4, the QRS detection from the actual electrocardiogram described above is performed by detecting a QRS waveform component with a bandpass filter and performing QRS detection with a certain threshold value a. Cannot trigger. And it has the refractory period A by the maximum value of a QRS waveform so that the count (double count) by a T wave may not be performed after QRS detection. When the trigger is applied to the P wave as shown in the figure B, the peak value of the P wave is lowered by lowering the gain of the entire electrocardiogram waveform as shown by the broken line so that the trigger is not triggered by the P wave. ing. The frequency characteristic component of the P wave in the electrocardiogram waveform is similar to the QRS frequency characteristic, and it is not possible to detect only the QRS component with the bandpass filter alone. Even those that detect R waves with a certain threshold may also detect P waves.

  However, in the electrocardiogram detection unit having the function of automatically adjusting the gain, the gain cannot be adjusted in time, and double counting due to the P wave and the R wave cannot be prevented.

  In order to prevent false triggers, there is no choice but to wait until the electrocardiogram waveform is stabilized, which has hindered standard routine examination (observation of echo images synchronized with biological signals) in the circulatory region. The same was true for various other ECG-synchronized new modes (TDI, TDI-Q, stress echo method, contrast echo method).

  In the above-described prior art, the observer (ultrasound diagnosis operator) manually sets the gain position value image of the electrocardiogram detection unit for each patient so that a trigger is applied in the vicinity of the R wave. And observe. This is because the electrocardiogram signal slightly changes depending on the patient's sex, flesh, weight, age, presence or absence of heart disease, and fluctuates depending on the patient's body movement.

  On the other hand, since the QRS detection threshold is constant, the observer (ultrasound diagnosis operator) operates the gain and position of the electrocardiogram detection unit for each patient so that a trigger is applied in the vicinity of the R wave, and at an appropriate position. Adjustment is made while viewing the electrocardiogram waveform so that the QRS trigger is applied. In addition, when the P wave peak value or the P wave is high, the P wave may trigger.

  Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electrocardiogram signal detection apparatus and an ultrasonic wave capable of performing image diagnosis by smooth electrocardiogram synchronization without setting a threshold by an operator. A diagnostic device is provided.

An electrocardiogram signal detection apparatus according to an embodiment includes a detection unit that detects an electrocardiographic waveform of a subject, an input unit that inputs subject ID information for specifying the subject, and the detected In order to generate an image acquisition trigger signal for image acquisition synchronized with the QRS wave generation timing in the electrocardiogram waveform, a delay time from the P wave and a threshold value for detecting the QRS wave are subject IDs. A storage unit that stores information for each information, a selection unit that selects the delay time and the threshold corresponding to the input subject ID information from the storage unit, the selected delay time and the selected threshold And a signal generator for generating the image acquisition trigger signal.
  An ultrasonic diagnostic apparatus according to an embodiment includes an input unit for inputting subject ID information for specifying a subject, and an image synchronized with a QRS wave generation timing among electric waveforms detected by the detection unit. In order to generate an image acquisition trigger signal for acquisition, a storage unit that stores a delay time from a P wave and a threshold value for detecting a QRS wave for each subject ID information, and the input target object A signal that generates the image acquisition trigger signal using the selection unit that selects the delay time and the threshold corresponding to the sample ID information from the storage unit, and the selected delay time and the selected threshold. A generation unit; and an image collection unit that collects an ultrasound image in response to the image collection trigger signal.

  According to the present invention, there is provided an electrocardiographic signal detection apparatus and an ultrasonic diagnostic apparatus in which QRS detection performance is remarkably improved, and heart motion diagnostic efficiency such as end-stage diastole and end-diastolic stage in the circulatory ultrasound diagnostic area is improved Can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram for explaining an ultrasonic diagnostic apparatus according to an embodiment of the present invention.

  In FIG. 1, a probe 25 having an ultrasonic transducer (not shown) and a biological signal detection unit 40 are connected to the main body 20 of the ultrasonic diagnostic apparatus. The ultrasonic diagnostic apparatus 20 includes an operation panel 21, a CPU (control MB) 22 as a control means, a transmission / reception drive control circuit 23, a transmission / reception / drive circuit 24, a data storage unit 27, and image control. And a circuit 28, a graphic board 29, a video circuit 30, and an image display 31. On the other hand, the biological signal detection unit 40 includes an electrocardiogram waveform input unit 41, an electrocardiogram unit control unit 42, a trigger signal generation circuit 43, a QRS detection threshold data storage unit 44, and a delay value data storage unit 45. Configured.

  The operation panel 21 is used for inputting the ID and information of the patient 35 as a subject, and is configured by a keyboard or the like. An operator not shown inputs necessary information of the patient 35 by operating the operation panel 21. The CPU 22 is for performing operation control of the entire ultrasound diagnostic apparatus 20 and operation control of a biological signal detection unit 40 described later.

  The transmission / reception drive control circuit 23 controls the transmission / reception drive circuit 24 based on a command from the CPU 22 to apply a drive pulse to the probe 25 and receive a reflected signal from the patient 35 received by the probe 25. The reflected signal is transmitted to the image control circuit 28 to obtain a tomographic image, and an electrocardiographic trigger signal is output to a trigger signal generation circuit (setting means) 43 in the biological signal detection unit 40.

  The data storage unit 27 stores various types of patient information in advance. The information stored in the data storage unit 27 is read based on the patient ID input through the operation panel 21, and includes, for example, the patient's sex, flesh, weight, age, presence / absence of heart disease, and the like. Composed.

  The image control circuit 28 converts a tomographic image (US image) into a video circuit 30 based on a command from the CPU 22 and a reflection signal from the transmission / reception drive control circuit 23 and an electrocardiographic waveform data from an electrocardiogram unit control unit 42 described later. Output to. In the video circuit 30, processing is performed to display the tomographic image on the image display 31 based on the resolution and drawing speed determined by the graphic board 29. The image display 31 displays the tomographic image obtained in this way.

  On the other hand, the electrocardiogram waveform input unit 41 obtains an electrocardiogram waveform from electrodes attached to the patient 35 (not shown). The electrocardiogram unit control unit 42 outputs the electrocardiogram waveform data to the above-described image control circuit 28 through the trigger signal generation circuit 43 based on the electrocardiogram waveform input from the electrocardiogram waveform input unit 41. The QRS detection threshold data storage unit 44 and the delay value data storage unit 45 store a QRS detection threshold and a predetermined delay value after P wave detection in advance as a data table. These QRS detection threshold values and delay values are read out to the electrocardiogram unit control unit 42 based on patient information by ID input from the ultrasonic diagnostic apparatus 20.

  In such an ultrasonic diagnostic apparatus, first, the probe 25 is brought into contact with the body surface of the patient 35. Next, the patient ID and the like are input from the operation panel 21 by the operator. Then, based on the inputted patient ID, information on the patient, for example, the sex, fleshiness, weight, age, presence / absence of heart disease, etc. of the patient are automatically selected from the data storage unit 27 and read out to the CPU 22.

  Information based on the patient ID is supplied from the CPU 22 in the main body 20 to the electrocardiogram unit controller 42 in the biological signal detection unit 40. Then, from these pieces of information, the corresponding delay value and QRS detection threshold value are automatically selected from the delay value data storage unit 45 and the QRS detection threshold data storage unit 44 and read out to the electrocardiogram unit control unit 42. The priority and (condition) based on the delay value and the QRS detection threshold can be selected by the operator.

For example, as condition 1, as shown in FIG. 2A, the electrocardiographic synchronization threshold value b is not less than (timing t ₁₂ ), and after the end of the delay count after the P wave detection (timing t ₁₁ ) (timing t ₁₂ ). ₁₃ ), an electrocardiographic trigger signal is generated from the trigger signal generating circuit 43.

Further, as condition 2, as shown in FIG. 2B, after the end of delay counting after P wave detection (timing t ₂₁ ) (timing t ₂₂ ), the electrocardiographic synchronization threshold c or more (timing t ₂₃ ), an ECG trigger signal is generated.

The delay value data is open to the operator and can be set to an arbitrary value by the operator. The delay value can be set to any value for each heartbeat (programmable). Therefore, an electrocardiographic trigger signal can be generated at an arbitrary position of the ECG waveform for each heartbeat desired by the operator. Referring to FIG. 3, in this embodiment, a delay value from P wave detection timings t ₃₁ to t 3 is set, and a QRS detection threshold d is set from the patient ID.

  On the other hand, a biological signal representing a heartbeat is acquired from an electrode (not shown) in contact with the patient 35 via an electrocardiogram waveform input unit 41. Based on the QRS detection threshold value and the delay value from the P wave, etc., the electrocardiogram unit controller 42 sends an electrocardiogram trigger signal to the ultrasonic diagnostic apparatus through the trigger signal generation circuit 43. 20 is sent to the transmission / reception drive control circuit 23, and the electrocardiographic waveform data is outputted to the image control circuit 28.

  The transmission / reception drive control circuit 23 controls the transmission / reception drive circuit 24 based on a command from the CPU 22 to apply a drive pulse to the probe 25 and receive a reflection signal from the patient 35 received by the probe 25. . The image control circuit 28 obtains a tomographic image (US image) based on the command of the CPU 22, the reflection signal from the transmission / reception drive control circuit 23, and the electrocardiographic waveform data from the electrocardiogram unit control unit 42. When this tomographic image is output to the video circuit 30, processing is performed to display it on the image display 31 based on the resolution and drawing speed determined by the graphic board 29. Then, the tomographic image thus obtained is displayed on the image display 31.

  Thus, according to the present embodiment, since the QRS detection threshold value is automatically set based on the data at the time of ID input at the start of the examination, there is no threshold setting by the operator, and a smooth diagnosis can be performed. In addition, since P wave detection is performed and QRS signal is detected even with a delay value from the P wave, QRS detection performance is remarkably improved with no false trigger, and the end stage of diastole and end diastole in the circulatory ultrasound diagnosis age region. This improves the efficiency of heart motion diagnosis. Furthermore, in contrast echocardiography by contrast agent injection, the number of administrations of the drug can be reduced, and the side effects on the patient can be reduced, and the cost burden is reduced.

  As mentioned above, although embodiment of this invention was described, in the range which does not deviate from the summary of this invention other than embodiment mentioned above, this invention can be variously modified.

  Further, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be extracted as an invention.

It is a block block diagram for demonstrating the ultrasonic diagnosing device by one Embodiment of this invention. It is a figure explaining the priority by the delay value and QRS detection threshold value which are read by the electrocardiogram unit control part. It is a figure for demonstrating determination of the QRS trigger position by the delay value after P wave detection and QRS detection threshold value by one Embodiment of this invention. It is explanatory drawing for obtaining an electrocardiogram synchronous signal by the QRS detection threshold with respect to the conventional electrocardiogram waveform.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 20 ... Ultrasonic diagnostic apparatus, 21 ... Operation panel, 22 ... CPU (control MB), 23 ... Transmission / reception drive control circuit, 24 ... Transmission / reception drive circuit, 25 ... Probe, 27 ... Data storage part, 28 ... Circuit for image control, DESCRIPTION OF SYMBOLS 29 ... Graphic board, 30 ... Video circuit, 31 ... Image display display, 35 ... Patient, 40 ... Biosignal detection unit, 41 ... Electrocardiogram waveform input part, 42 ... Electrocardiogram unit control part, 43 ... Trigger signal generation circuit, 44: QRS detection threshold data storage unit, 45: Delay value data storage unit.

Claims (8)

  A detection unit for detecting an electrocardiographic waveform of the subject;
  An input unit for inputting subject ID information for specifying the subject;
  In order to generate an image acquisition trigger signal for image acquisition in synchronization with the generation timing of the QRS wave among the detected electrocardiographic waveforms, a delay time from the P wave, a threshold for detecting the QRS wave, For each subject ID information,
  A selection unit for selecting the delay time and the threshold corresponding to the input subject ID information from the storage unit;
  A signal generator for generating the image acquisition trigger signal using the selected delay time and the selected threshold;
  An electrocardiographic signal detection apparatus comprising:   The signal generation unit, after identifying the timing based on the selected delay time, when the first condition that the signal value of the electrocardiographic waveform detected by the detection unit is equal to or greater than the selected threshold, The electrocardiographic signal detection device according to claim 1, wherein the image acquisition trigger signal is generated.   When the signal generation unit satisfies a second condition that is a timing based on the selected delay time after the signal value of the electrocardiographic waveform detected by the detection unit is equal to or greater than the selected threshold value, The electrocardiographic signal detection device according to claim 1, wherein the image acquisition trigger signal is generated.   A first condition in which a signal value of an electrocardiographic waveform detected by the detection unit is equal to or higher than the selected threshold after the timing based on the selected delay time is specified; and the detection unit The image acquisition is performed using a high-priority condition among the second conditions that become a timing based on the selected delay time after the signal value of the electrocardiographic waveform detected by the signal becomes equal to or greater than the selected threshold value. 2. The electrocardiogram signal detection device according to claim 1, wherein a trigger signal is generated.   An input unit for inputting subject ID information for specifying the subject;
  In order to generate an image acquisition trigger signal for image acquisition synchronized with the generation timing of the QRS wave among the electric waveforms detected by the detection unit, a delay time from the P wave, a threshold for detecting the QRS wave, and , For each subject ID information,
  A selection unit for selecting the delay time and the threshold corresponding to the input subject ID information from the storage unit;
  A signal generator for generating the image acquisition trigger signal using the selected delay time and the selected threshold;
  In response to the image acquisition trigger signal, an image acquisition unit that acquires an ultrasound image;
  An ultrasonic diagnostic apparatus comprising:   The signal generation unit, after identifying the timing based on the selected delay time, when the first condition that the signal value of the electrocardiographic waveform detected by the detection unit is equal to or greater than the selected threshold, The ultrasonic diagnostic apparatus according to claim 5, wherein the image acquisition trigger signal is generated.   When the signal generation unit satisfies a second condition that is a timing based on the selected delay time after the signal value of the electrocardiographic waveform detected by the detection unit is equal to or greater than the selected threshold value, The ultrasonic diagnostic apparatus according to claim 5, wherein the image acquisition trigger signal is generated.   A first condition in which a signal value of an electrocardiographic waveform detected by the detection unit is equal to or higher than the selected threshold after the timing based on the selected delay time is specified; and the detection unit The image acquisition is performed using a high-priority condition among the second conditions that become a timing based on the selected delay time after the signal value of the electrocardiographic waveform detected by the signal becomes equal to or greater than the selected threshold value. 6. The ultrasonic diagnostic apparatus according to claim 5, wherein a trigger signal is generated.

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