JPH06269426A - Display device for organic electric/organic physical phenomenon - Google Patents

Abstract

PURPOSE:To monitor an exact electrocardiographic signal or the like inside an MRI room and further to prevent any adverse influence from being exerted upon an MRI device. CONSTITUTION:This device is provided with a video converter 8 for receiving the electrocardiographic signal or the like of a patient at an MRI operation room for displaying this signal and for outputting a video signal corresponding to this display content, magnetic shield line for transmitting the output of the video converter 8 closely to the patient, and display part 10 magnetically shielding an enclosure to display an electrocardiograph while receiving the video signal from the magnetic shield line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device attached to a magnetic resonance imaging diagnostic apparatus, and more particularly, a doctor can take an image of a patient using a magnetic resonance imaging (MRI) apparatus while a doctor is in an MRI room. Relates to a display device capable of monitoring bioelectricity and biophysical phenomena of the patient.

[0002]

2. Description of the Related Art A patient can be crossed (A
A magnetic resonance imaging (MRI) diagnostic apparatus has been proposed as an apparatus for generating images in xial, coroal, and sagittal directions. This device
A radio wave (RF pulse) is applied to a human body placed in a strong magnetic field to resonate atomic nuclei to create an image. In other words, when the atomic nuclei in the body placed in a uniform magnetic field absorb the energy of radio waves of a certain wavelength, the stored radio energy is emitted again in the form of radio waves. Is. In addition,
The nucleus is mainly a hydrogen nucleus, but ¹³
C, ¹⁹ F, ²³ Na, ³¹ P, etc. are also applicable.

FIG. 4 shows this magnetic resonance imaging (MR
I) It is a diagram showing the usage mode of the diagnostic device, and
A case is shown where an image is obtained while a technician 43 and a doctor 44 monitor a patient 42 in a room 41. Here, the magnetic resonance imaging diagnostic apparatus includes an MRI main body 45 formed of a superconducting magnet, a normal conducting magnet, and the like, and an engineer 43.
It is configured with an MRI control unit 46 which is operated by the above and displays an image or the like. In order to obtain a reliable image, it is necessary to prevent the magnetic field in the MRI chamber 41 from being disturbed by external disturbances, so that the MRI chamber 41 is strictly magnetically shielded.

By the way, when operating the magnetic resonance imaging diagnostic apparatus, it is necessary to properly grasp the biological condition of the patient. Therefore, a display monitor 47 is provided near the doctor 44 to display an electrocardiogram and, if necessary, a pulse wave signal waveform and a blood pressure signal waveform. In the case of FIG. 4, only the electrode 48 attached to the limb of the patient 42 for detecting the action potential of the myocardium and the preamplifier 49 for amplifying the output of the electrode 48 are shown.
A pulse wave monitor and a blood pressure monitor are not shown.

The doctor 44 grasps the biological condition of the patient 42 based on the waveform displayed on the display monitor 47 and the like, and the technician 4
3 is instructed to operate the MRI control unit 46. For example, in the case of a patient with heart disease, the electrocardiogram, blood pressure, and pulse rate are constantly monitored, and if an abnormality occurs in the electrocardiogram, the operation of the MRI main body unit 45 is immediately stopped.

[0006]

However, the apparatus configuration shown in FIG. 4 for monitoring the patient's biological condition in a room separate from the MRI room has various problems. That is, the doctor
Since the biological condition of the patient is monitored by the display monitor 47 in a room different from the room I, even if a sudden abnormality occurs in the patient, he cannot immediately go to the patient and take appropriate measures. There is a problem that it takes time to get it. Also, even if no sudden abnormal situation occurs,
Patients often suffer from anxiety and fear as they are left alone in a noisy MRI room, and it is therefore most desirable to have a doctor always with them.

Here, in order for the doctor to accompany the patient, M
Although it is necessary to constantly monitor the biological condition of the patient in the RI room, there are various difficulties described below in bringing the display device for monitoring the biological condition into the MRI room.

(1) If a device is unnecessarily brought into the MRI room, the magnetic field or the like is disturbed by the influence of the device, so that a reliable image cannot be obtained. That is, electrical noise or the like should not be generated from the patient or a device installed in the vicinity of the MRI main body. For example, if the display monitor 47 is installed in the MRI room, an accurate image can be obtained from the MRI device. Will not be obtained, and there is a risk of misdiagnosis.

(2) Since the cathode ray tube of the display monitor 47 is directly affected by the magnetic field, if a display device using a cathode ray tube is installed in the MRI room, a normal waveform cannot be displayed in the first place. . Further, even in a display device that does not use a cathode ray tube, there is a problem that the display waveform is influenced by the influence of a strong magnetic field in the MRI room.

FIG. 5 shows a normal electrocardiogram (a) and an electrocardiogram (b) of a patient who has undergone myocardial infarction in the past and is still continuing.
6A and 6B show an electrocardiogram (c) of a patient who is currently having myocardial infarction, and FIG. 6 shows a standard waveform (a) in an arterial blood vessel with a characteristic of two peaks and a blood pressure waveform of a patient with aortic valvular disease (B) is shown. As is clear from FIG. 5 and FIG. 6, the difference between the normal waveform and the abnormal waveform is subtle, and there are several types of abnormal waveforms, so as to avoid misdiagnosis, The blood pressure signal and the like must be displayed extremely faithfully.

(3) Since the wall between the MRI room and the MRI operation room needs to be magnetically shielded strictly, M
It is difficult to draw a large number of leads into the RI room, and for example, it is impossible to separately lead the electrocardiogram signal and the blood pressure signal output from the auxiliary terminals of the display monitor to the MRI room. Here, it is conceivable that one conductor is time-divided and a plurality of signals are transmitted, but the pulse signal necessary for time-dividing the conductor may adversely affect the image, and an appropriate measure should be taken. I can't say. Also,
The wiring between the MRI room and the MRI operation room runs through a magnetically and electrically shielded box under the floor along the walls of each room, which can reach up to 15 meters long. From this point as well, it is not appropriate to lead a weak electrocardiogram signal to the MRI room again.

The present invention focuses on these problems, and provides a display device capable of accurately monitoring an electrocardiogram signal, a blood pressure signal and the like in an MRI room and having no adverse effect on the MRI device. The purpose is to provide.

[0013]

In order to achieve the above object, the display device for bioelectric / biophysical phenomena according to the present invention is applicable to the case where an image of a patient is produced by using a magnetic resonance imaging apparatus. A display device for displaying a biological condition of a patient, wherein a signal indicating the biological condition of the patient is displayed.
The magnetic resonance imaging apparatus receives the signal at a location not affected by the magnetic resonance imaging apparatus, displays a temporal change of the signal on the display unit, and outputs a transmission signal corresponding to the display content, and the transmission signal. The transmission means for transmitting to the vicinity of the patient, and the housing for displaying the signal indicating the biological condition of the patient are magnetically shielded by receiving the transmission signal from the transmission means and converting it appropriately. A display means is characteristically provided.

Here, the signal indicating the biological condition is MRI.
It is not particularly limited as long as it shows the biological condition of the patient in the room, but for example, an electrocardiogram signal, a blood pressure signal, a pulse wave signal, or the like is applicable. The conversion means displays the time change of the signal indicating the biological condition of the patient on the display unit, and outputs the transmission signal corresponding to the display content. Here, the transmission signal is not particularly limited as long as it transmits the display content of the display unit, and for example, NTSC (National Televisi).
on System Committee) video signal, PAL (Phase Alt)
ernating Line) Video signal is applicable. An optical signal may be used as the transmission signal as long as it can reproduce a signal waveform such as an electrocardiogram signal.

The transmission means is for transmitting the transmission signal to the vicinity of the patient, and is, for example, a magnetic shield wire or an optical fiber cable. In addition, claim 2
In the case of the invention according to, the switching means is provided in the middle of the transmission means. This switching means includes the first and second
The input section and the output section are provided and output either the video signal output by the conversion means or the video signal output by the home video.

After appropriately converting the transmission signal, the display means reproduces a signal waveform such as an electrocardiogram signal on a liquid crystal panel, a plasma display, an EL display, or the like. Therefore, the doctor can always grasp the biological condition of the patient based on the display content of the display means.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bioelectric / biophysical phenomenon display device according to the present invention will be described below with reference to the drawings. Figure 1
FIG. 3 is a diagram for explaining a bioelectric / biophysical phenomenon display device according to an embodiment of the present invention. That is, FIG.
(A) of FIG. 1 shows a state in which a doctor is attending a patient in a magnetically shielded MRI room, and (b) of FIG.
Shows a state in which a tomographic image and an electrocardiogram are displayed in the operation room.

The MRI main body 1 is installed in the MRI room, and the MRI main body 1 includes the interface box 2
Is connected to the MRI control device 3 in the operation room. A tomographic image 4 is displayed on the MRI control device 3. An electrocardiographic electrode 5 is attached to a patient in the MRI room, and an electrocardiographic signal obtained from the electrode 5 is amplified by a preamplifier 6 and then supplied to a display monitor 7. Although not shown, the patient is also equipped with a sphygmomanometer and a sphygmograph as required, and signals obtained from these are also supplied to the display monitor 7.

The display monitor 7 is a known one,
The electrocardiogram, blood pressure signal, and pulse wave signal are displayed on the display device 7a such as a cathode ray tube. The auxiliary terminal of the display monitor 7 is connected to the input terminal of the video converter 8, and the electrocardiogram signal and blood pressure signal derived from this auxiliary terminal are supplied to the video converter 8. . The video converter 8 converts an electrocardiogram signal, a blood pressure signal, etc. into an NTSC video signal and outputs the NTSC video signal, and also has a built-in display unit 8a.
The electrocardiogram signal and blood pressure signal are displayed in arbitrary size.

The NTSC video signal output from the converter 8 is led to the MRI room via the switching box 9 and the interface box 2 and supplied to the display device 10. Therefore, an image of the same type as the display unit 7a or the display unit 8a is displayed on the display device 10, and the doctor
It will be possible to always grasp the biological condition of the patient. The connection cable is tightly shielded and NT
The SC video signal does not leak.

The display device 10 is composed of a signal conversion unit for receiving an NTSC video signal and a display unit 10a.
The display unit 10a corresponds to, for example, a liquid crystal panel, a plasma display, an EL display, or the like. Then, the signal conversion unit receives the NTSC video signal via the connection cable and converts this signal into a signal according to the type of the display unit 10a. Further, the casing of the display device 10 is strictly magnetically shielded by a diamagnetic material such as a copper plate or stainless steel, and the display screen of the display device 10 is displayed regardless of whether the MRI main body 1 is in the operating state. It is not affected by the magnetic field, and the NTSC video signal is MRI
There is no adverse effect on the main body 1.

The switching box 9 is also connected to the home video 11, and a video image can be displayed on the display device 10 by switching the switch of the switching box 9. For example, it is used for the purpose of relaxing the patient when the MRI main body 1 is in an operating state.

FIG. 2 illustrates another embodiment of the present invention, in which a connection relationship between an electrocardiogram monitor 7 ', which is an example of a display monitor, and a bioelectric / biophysical phenomenon display device 12 according to the present invention. Is shown. In FIG. 2, a bioelectric / biophysical phenomenon display device 12 is a video converter 8
And the relay box 13 and the display device 10. Note that the display device 10 is magnetically shielded,
It is installed in the room, and other devices are installed in the operation room.

The video converter 8 receives the electrocardiogram signal IN1 and the blood pressure signal IN2 from the electrocardiogram monitor 7 ', converts them into an NSTC video signal, and outputs it to the relay box 13. From the relay box 13, the power supply voltage for the display device and the NSTC video signal are output and supplied to the display device 10. Although the relay box 13 is installed outside the MRI room in FIG.
If the magnetic shield of 3 is perfect, it may be provided in the MRI room.

FIG. 3 shows the video converter 8 shown in FIGS.
2 is an internal block diagram of FIG. The video converter 8 includes an input unit 14 that receives an electrocardiogram signal IN1, a blood pressure signal IN2, and a pulse wave signal IN3, a key switch operation unit 15, a control unit 16, and an NTSC signal conversion unit 17. . The input section 14 has a buffer amplifier 18 _-1.
And to 18 _-3, it is composed of an A / D converter 19, A
The / D converter 19 has an electrocardiogram signal IN1 and a blood pressure signal IN.
2 and the pulse wave signal IN3 are converted into digital data.
The gains of the buffer amplifiers 18 _-1 to 18 _-3 can be changed appropriately.

The control unit 16 is composed of a CPU 20, a RAM 21, a ROM 22 and the like.
Operates according to the program stored in M22,
The operation of each part of this device is controlled, and the A / D converter 1
The digital data output from 9 is stored in the RAM 21. Further, the buzzer 23 sounds when an abnormal situation occurs.

The NTSC signal conversion section 17 includes a CRT controller 24, a graphic RAM 25, a timing correction section 26, an LCD control section 27, and an LCD display section 8a.
And an NTSC converter 28 _-1 , 28 _-2 . The CRT controller 24 operates based on the digital data stored in the RAM 21 to create RGB data for CRT screen display, and the NTSC converter 28 _-1 ,
28 _-2 converts this RGB data into an NTSC video signal and outputs it. Incidentally, one of the NTSC converters is provided as a spare.

The LCD control unit 27 converts the RGB data into LC
The signal is converted into a D display signal to drive the LCD display unit 8a. That is, the LCD display section 8a displays the electrocardiogram, blood pressure signal, etc. corresponding to the NTSC video signal.

The key switch operating section 15 is composed of a key switch 29 and a key scanner section 30 for detecting the ON / OFF state of the key switch 29. The key switch 29 is for instructing the size (sensitivity) and the display position of the electrocardiogram displayed on the LCD display unit 8a,
The operator appropriately operates the up switch UP and the down switch DN to instruct the sensitivity and display position of the electrocardiogram signals (CH1 to CH3). Also, key switch 2
9 is also equipped with a switch for instructing enlargement / reduction of the display waveform in the time axis direction, and the display speed is 1.25 cm /
It can be set to SEC, 25 cm / SEC, 50 cm / SEC.

The CPU 20 turns on / off the keyboard 29.
Since each part of the device is controlled in accordance with the FF state, the display contents of the LCD display part 8a and the display device 10 in the MRI room change according to the instruction of the operator.

By the way, in the operation room, the same kind of signal waveforms are displayed on the display monitor 7 and the LCD display section 8a, which is considered to be wasteful (see FIG. 1B). However, the electrocardiogram and blood pressure waveform are very important, and the whole waveform is displayed on the display monitor 7,
Since it is often desired to enlarge and display a part of the waveform on the LCD display unit 8a, it is effective to provide two types of display screens. In addition, it is often the case that it is desired to display a signal waveform desired by a doctor based on an instruction from the doctor in the MRI room, and it is useful to provide two types of display screens in order to detect a failure of the converter 8. . The operator and MRI in the operation room
The doctor in the room may be connected by a voice line so that both can freely talk. In this case, the audio signal and NTS
Since the C video signal can be transmitted through the same conductor, there are no restrictions on the interface box 2 and magnetic shield problems.

FIG. 7 illustrates another embodiment of the present invention. In this embodiment, a test device 31 for receiving an electrocardiogram signal and the like, a display device 32 for displaying an electrocardiogram, and the like,
The video camera 33 includes a video signal display device 34 and the like. The examination device 31 has a display unit 31a composed of a cathode ray tube or a liquid crystal panel, and displays in analog form an electrocardiogram showing the biological condition of the patient.

The display device 32 is connected to the inspection device 31, and the same waveform as that of the display portion 31a is displayed on the display portion 32a thereof. Here, the display unit 31a,
32a are installed in parallel so that the operator of the MRI control device can monitor the patient's biological condition at a position where it is easy to see, and it is convenient to display the same waveform at different magnification / reduction ratios. In some cases, the display device 32 may be omitted and the display unit 31a of the inspection device 31 may be replaced by the video camera 33.
You may take a picture in.

In any case, since the video signal corresponding to the display screen of the display unit 31a or the display unit 32a is obtained from the video camera 33, this video signal is MR-converted.
It is supplied to the video signal display device 34 in the I room. In this way, the electrocardiogram and blood pressure waveform of the patient are constantly displayed on the video signal display device 34, so that the doctor can grasp the biological condition of the patient in the MRI room.

Although a plurality of embodiments have been described above, the design of the bioelectric / biophysical phenomenon display device according to the present invention is not limited to these embodiments and can be appropriately modified. For example, in the embodiments of FIGS. 1 to 3, the case where an electrocardiogram signal or a blood pressure signal derived from the auxiliary terminal of the existing display monitor 7 is used as an example, but the electrocardiogram signal obtained from the electrode of the patient is directly used. It may be supplied to the video converter 8. However, in this case, since the video converter 8 and the patient are directly connected to each other, a device or the like for preventing the shock death of the patient due to the leakage current is required. Various conditions are weighted, and as a result, manufacturing costs and the like increase, which is not always appropriate. That is, as shown in FIG. 1 to FIG. 3, if an existing display monitor is used, the MR can be formed with a simple circuit configuration.
This is very effective because the patient's biological condition can be reliably monitored in the I room.

Although the video converter has been described as outputting the NTSC video signal, the present invention is not limited to this, and may be a PAL video signal, for example. In addition, the PCM (pulse code
Modulation) method may be used for transmission. In this case, it is necessary to provide the display device 10 with a recognition circuit compatible with the communication method. Furthermore, since it is not necessary to be limited to the electric signal, the optical signal may be modulated by the electrocardiogram signal or the blood pressure signal and transmitted to the display device 10 using the fiber cable.

Although the magnetic shield line and the fiber cable have been described above, an optical transmission system which does not require wiring may be used. For example, since there is a window for patient monitoring between the MRI room and the operation room, an optical transmitter and an optical receiver are installed through this window to transmit an electrocardiogram signal and a blood pressure signal. You can also do it. The optical signals used here include, for example, infrared rays and laser beams,
This communication method does not generate electrical noise, so MR
There is no adverse effect on the I body. The display device for bioelectric / biophysical phenomena according to the present invention is also applicable to a magnetic resonance spectrum device (MRS).

[0038]

As described above, the bioelectric / biophysical phenomenon display device according to the present invention receives the signal indicating the biological condition of the patient and outputs the transmission signal, and the transmission signal. It is characteristically provided with a transmission means for transmitting even to the vicinity of the patient and a display means for displaying a signal indicating the biological condition of the patient in the vicinity of the patient, and has the following unique effects.

That is, when a patient's image is created using the magnetic resonance imaging apparatus, the patient's biological condition can be grasped in the MRI room in parallel with this, so that the doctor can always be near the patient. Therefore, appropriate treatment according to the patient's condition is possible.

Further, since the doctor can accompany the patient in the MRI room, for example, the photographing can be started after giving an appropriate exercise load to the patient, and the medical treatment in the MRI room is possible. Very informative. Furthermore, there is a merit that the existing ECG monitor can be used, and the cost for refurbishing the equipment can be kept low.

[Brief description of drawings]

FIG. 1 is a view for explaining a bioelectric / biophysical phenomenon display device according to the present invention.

FIG. 2 illustrates another embodiment of the present invention.

FIG. 3 is a block diagram of a video converter that is part of the display device shown in FIG.

FIG. 4 illustrates a state in which tomography is being performed by a conventional apparatus.

FIG. 5 illustrates an electrocardiogram waveform.

FIG. 6 illustrates a blood pressure signal waveform.

FIG. 7 illustrates yet another embodiment of the present invention.

[Explanation of symbols]

 1 Magnetic Resonance Imaging (MRI) Main Unit 2 Interface Board 3 MRI Controller 4 Tomographic Image 5 Electrode 6 Preamplifier 7 Display Monitor 8 Video Converter (Conversion Means) 9 Switching Box 10 Display Device (Display Means)

Claims (3)

[Claims] 1. A display device for displaying a biological condition of a patient when an image of the patient is created by using the magnetic resonance imaging device, wherein a signal indicating the biological condition of the patient is transmitted by the magnetic resonance imaging device. Converting means for receiving at a place not affected, displaying the temporal change of the signal on the display unit, and outputting a transmission signal corresponding to the display content, and transmitting the transmission signal to the vicinity of the patient And a display unit in which a casing for displaying a signal indicating the biological condition of the patient is magnetically shielded by receiving the transmission signal from the transmission unit and converting the signal appropriately. A display device for bioelectricity / biophysical phenomena characterized by: 2. A display device for displaying a biological condition of a patient when an image of the patient is created by using the magnetic resonance imaging device, wherein a signal indicating the biological condition of the patient is transmitted by the magnetic resonance imaging device. While receiving at a place not affected, displaying a temporal change of the signal on the display unit, and converting means for outputting a video signal corresponding to the display content, and receiving the video signal at the first input unit, A video signal output from the home video is received by the second input unit, and switching means for outputting only one of the video signals and a video signal output by the switching means are transmitted to the vicinity of the patient. And a display means for receiving the video signal from the transmission means and displaying the video signal in the vicinity of the patient, the display means having a magnetic shield. Display of bioelectrical / biological physical phenomena characterized by. 3. The display unit, wherein the conversion unit receives a signal indicating a biological condition of the patient at a place not affected by the magnetic resonance imaging apparatus and displays a temporal change of the signal, and the display unit. 2. The bioelectric / biophysical phenomenon display device according to claim 1, further comprising: a photographing unit that photographs a displayed image and outputs a video signal.