JPS624129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a body surface potential distribution data acquisition device that acquires body surface potential distribution data for creating and displaying a body surface potential distribution map.

The body surface potential distribution map is obtained by using a detector (as such a detector) that detects a large number of body surface potentials on the body surface of the part to be measured of the subject, for example, in the case of the heart, the chest and/or the back of the body. (a well-known electrocardiograph detector is usually used) are placed at predetermined intervals using conductive cream, etc., and the output signals from each detector are simultaneously measured. The output is displayed as an equipotential distribution map with the body surface as the reference plane based on its arrangement.Since it was announced by Taccardi in Italy in 1963, it has been extremely effective in diagnosing the human body, especially the heart. It has been found that this method provides a wide range of information, and its application development has been active in recent years. A device for creating and displaying this body surface potential distribution map is already commercially available as a body surface cardiac potential distribution map creation device.

By the way, in a body surface potential distribution data acquisition device that collects data of such a body surface potential distribution map, the number of the detectors is large, ranging from several tens to several hundreds, so the capacity of the storage device for data acquisition is large. In addition to the problem that the acquired data is difficult to determine from where in the P, Q, R, S, T, and U waves of the electrocardiogram the acquisition should start, it is necessary to acquire extra data. In addition, each detector has a different zero point and drift depending on how it is attached to the human body, and in order to obtain an accurate body surface potential distribution map, it is necessary to correct it, but there is no simple method. There are problems etc.

The present invention was made to solve this problem, and provides a body surface potential distribution data acquisition device that is extremely easy to operate.

That is, the present invention provides a system in which the output signals of a large number of detectors for detecting body surface potentials arranged at predetermined intervals on the body surface of a diagnostic site of a subject are exchangeably installed in a storage device via a processing device. A body surface potential distribution data acquisition device configured to acquire data on a storage medium, comprising: a high-speed memory having a storage capacity necessary to store data corresponding to an output signal of the detector for a predetermined time; means for sequentially storing the latest data of the detector in a memory; an image display device for displaying an output signal waveform of the detector; and at least one output of the detector synchronized with the data stored in the high-speed memory. A body surface characterized by comprising means for displaying a signal waveform on the image display device, and an instruction device for giving a transfer instruction to the processing device based on the output signal waveform displayed on the image display device. This is a potential distribution data acquisition device.

The details of the present invention will be explained below with reference to the drawings based on an example in which it is applied to body surface cardiac potential distribution measurement.

FIG. 1 is an explanatory diagram of the measurement situation of the embodiment, and FIG. 2 is a block diagram of the embodiment.

As shown in FIG. 1, when diagnosing the heart, a detector 1 for detecting body surface potential is placed in a grid pattern at predetermined intervals on the body surface of the chest and/or back of the subject. will be placed in The detector 1 is attached to the body surface using a suction cup or tape provided on the detector 1. Specifically, there are 8 rows and 8 columns on the body surface of the chest and the back, that is,
It is equipped with 64 detectors 1. In addition, detector 1
Since a device used in a known electrocardiograph was used, a detailed explanation thereof will be omitted. Furthermore, as the reference electrode of the detector 1, Wilson's center electrode method, which is often used for electrocardiogram measurement, was applied. Therefore, each detector 1 outputs an output waveform similar to a known electrocardiographic waveform as an output signal in response to heart beats, that is, heartbeats.

The output signal is then acquired as data for creating the electrocardiographic potential distribution map as shown in FIG. That is, the output signal of each detector 1 is amplified to a predetermined level by an amplifier 2 provided corresponding to each detector 1. The amplified output signal is sequentially scanned by a multiplexer 3. The multiplexer 3 sequentially samples each output signal of the detector 1 at a predetermined period (in the specific example, the period was 2 ms), and outputs each output signal of the detector 1 sequentially in time series. That is, one scan of the multiplexer 3 provides data corresponding to one image of the body surface potential distribution. The output of multiplexer 3 is
The signal enters the A/D converter 4, which converts the analog value into a digital value, via the sampling and hold circuit 10, and is converted into a digital value. The above configuration is well known as a multi-point data acquisition device, and detailed explanation thereof will be omitted.

As described above, each output signal of the detector 1 is
It is converted into output data which is a digital value. The output data then enters a processing device 5 composed of a microcomputer. By the way, as shown in FIG. 2, the processing device 5 includes an IC memory 6, which is a high-speed memory that can be randomly accessed, and a floppy disk device 7, which is a storage device to which a non-volatile storage medium can be attached interchangeably. A CRT device 8, which is an image display device that displays graphics based on data from the processing device 5, and a light pen 9, which is an instruction device that gives instructions to the processing device 5, are connected. controlled by. Note that the configurations of each of the above devices are well known, so a detailed explanation thereof will be omitted.

That is, the output data that has entered the processing device 5 is first sequentially stored in the IC memory 6. By the way, the storage capacity of the IC memory 6 is set to be the capacity necessary to store the output data for a predetermined period of time. For example, as in the specific example, detector 1 is 128
If the period of multiplexer 3 is 2 ms, and the output data for 2 heartbeats is to be stored, one heartbeat can be considered to be 1 second, so 128×
It is necessary to store 500×2=128000 pieces of data. Therefore, if the output data is configured as 8 bits,
The storage capacity of the IC memory is 128K bytes. Since the number of output data that can be collected in the IC memory 6 is limited, when the measurement starts and the output data exceeds the capacity of the IC memory 6 after the predetermined time has elapsed, the processing device 5 sequentially collects the output data that exceeds the capacity of the IC memory 6. The IC memory 6 is controlled to be stored again from the first address, that is, to perform circular storage. Therefore, the IC memory 6 always stores the latest output data corresponding to the predetermined time.

On the other hand, the processing device 5 is configured to control the CRT device 8 in the following manner in parallel with controlling the IC memory 6. That is, the output data of the detector 1 at a specified setting position is inputted to the CRT device 8 from an input typewriter (not shown) of the processing device 5, and the output waveform is cyclically stored in the IC memory 6 on the CRT device 8. The output data is displayed in synchronization with the current output data. Therefore, the output data stored in the IC memory 6 can be observed by the CRT device 8 as an output waveform similar to an electrocardiogram waveform. Furthermore, the screen of the CRT device 8 displays the output waveform along with the commands from the processing device 5.
A transfer command mark for instructions using the light pen 9 is displayed.

By the way, the processing device 5 is configured to operate as follows using the light pen 9. That is, when you specify the transfer mark with the light pen 9 and then specify an arbitrary point on the output waveform displayed on the same screen, the output data for a preset time based on the point is stored in the IC memory. 6 to a floppy disk in a floppy disk device 7.

With the above configuration, after the detector 1 is attached to the subject as shown in FIG. 1, when the input typewriter is used to instruct the start of measurement,
The output waveform of the designated detector 1 is displayed on the CRT display device 8. Therefore, observing the output waveform,
When the output waveform becomes stable or when an abnormal waveform is observed, point the transfer command mark with the light pen 9, and then mark a point on the output waveform, for example, if an abnormal waveform is observed, the end point of the abnormal waveform. Instruct. Then, output data for the set time period before and/or after the designated point is transferred from the IC memory 6 to the floppy disk of the floppy disk device 7. In this way, the data necessary for diagnosis can be obtained with very simple operations. In particular, abnormal waveforms are noticed after observation, but since past data is stored in the IC memory 6, very suitable data can be acquired. In addition, data starting from, for example, a P wave can be easily acquired corresponding to an electrocardiogram waveform, and when displaying a body potential distribution map, the same progress as a conventional electrocardiogram can be displayed, which is very effective from a diagnostic point of view. In this embodiment, the data collected on the floppy disk in this way is read out again and displayed on the CRT display device 8.
displays the output waveform of the detector 1 at the set position as a still image together with a correction command mark, points to the correction command mark with the lantern pen 9, and then points to a plurality of arbitrary points on the still output waveform on the screen. Then, the specified plurality of arbitrary points are set as the zero point of the body potential, and zero point and drift correction is performed for all of the detectors 1, with the straight line connecting the arbitrary points set as the zero level. It's like this.
Therefore, the zero point and drift correction of the detector 1 can be performed extremely easily and accurately. Note that the above arbitrary point is between the P wave and Q wave in the electrocardiogram waveform.
It is preferable to select areas with low activity, such as the PQ area and the ST area between the S wave and the T wave.

Although the present invention has been described in detail above, the present invention is not limited to the embodiments described above.

Although a method of storing data in the IC memory 6 using circular storage is shown, it is also possible to store data sequentially from the first address, and after overflow, shift all data by one address and store new data at the last address. However, the data stored earlier may be sequentially shifted down so that the latest data is always stored at the first address. In short, the IC memory 6 may be configured to store data for the latest predetermined time period.

It goes without saying that other devices may be used as long as they have the same functions. For example, a cassette tape may be used instead of a floppy disk, and a normal input/output typewriter may be used instead of a light pen.

Note that it is also possible to add a function to the processing device to synthesize a body surface potential distribution map from the data collected on the floppy disk, and to display the body surface potential distribution map on the image display means. .

As described above, the present invention includes a high-speed memory that stores output data of a detector for a predetermined period of time, and a detector 1.
By organically combining a display device that displays the output waveform of the
Since the data acquisition is controlled by the indicating device while observing the output waveform of the detector, the data necessary for diagnosis can be obtained accurately with simple operations, making it possible to apply it to the diagnosis of body surface potential distribution. This is extremely effective in eliminating the complexity of data acquisition work, which was an obstacle in the past.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a measurement situation in an embodiment of the present invention, and FIG. 2 is a block diagram of the embodiment. 1 is a detector, 5 is a processing device, 6 is an IC memory, 7 is a floppy disk device, and 8 is a CRT device.

Claims (1)

[Scope of Claims] 1. The output signals of a large number of detectors arranged at predetermined intervals on the body surface of the subject's body surface at the diagnosis site are installed in a storage device so that the output signals can be exchanged via a processing device. A body surface potential distribution data acquisition device configured to acquire data on a storage medium in which data is stored, comprising: a high-speed memory having a storage capacity necessary to store data corresponding to an output signal of the detector for a predetermined period of time; means for sequentially storing the latest data of the detector in a high-speed memory; an image display device for displaying the output signal waveform of the detector; and at least one of the detectors synchronized with the data stored in the high-speed memory. A body comprising means for displaying an output signal waveform on the image display device, and an instruction device for giving a transfer instruction to the processing device based on the output signal waveform displayed on the image display device. Surface potential distribution data acquisition device. 2. When the instruction device indicates an arbitrary point on the output signal waveform displayed on the image display device,
2. The body surface potential distribution data acquisition device according to claim 1, wherein said data for a desired time period based on said arbitrary point is transferred from said high speed memory to said storage medium.