JP3109426B2 - Medical diagnostic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical diagnostic apparatus employing a distributed control system, such as an X-ray fluoroscopic apparatus, and more particularly, to a method in which, for example, an object is detected when a CPU controlling the control falls into a runaway state. The present invention relates to a technique for emergency-stopping a device to be controlled involving mechanical movement such as a top plate on which a (patient) is placed.

[0002]

2. Description of the Related Art As a typical example of a conventional medical diagnostic apparatus, there is an X-ray fluoroscopic apparatus. This X-ray fluoroscopic apparatus is composed of a main body, a console, a high-voltage power supply, a quick-shooting apparatus, a controller, and the like, and is usually arranged in a room separate from the console and the controller. The main body of the X-ray fluoroscopy apparatus includes a top plate for mounting a subject, and an X-ray tube and an image intensifier (hereinafter, abbreviated as “II tube”) that are arranged to face each other with the top plate interposed therebetween. X-ray irradiation detection system, TV camera and camera control unit (hereinafter abbreviated as "CCU") connected to the I / I tube, as well as a top plate moving mechanism and an interlocking moving mechanism between the X-ray tube and the I / I tube Is provided. The console includes a monitor for displaying X-ray fluoroscopic images,
A group of switches for setting fluoroscopy / imaging conditions or for instructing various operations such as start / stop of X-ray fluoroscopy and start of X-ray imaging, and a group of lamps for displaying operation states of respective devices in response to the instructions. Etc. are provided. The quick-shot photography device uses a transparent X
A mechanism for printing a line image is provided. And
The control device is connected to each device such as a main body, a high-voltage power supply, and a quick-shooting device by a cable, and performs control of each device in a centralized manner. In other words, the conventional X-ray fluoroscopy apparatus employs a centralized control system.

[0003]

However, in the case of the X-ray fluoroscopy apparatus of the centralized control system, there are the following problems. In other words, in the case of the centralized control method, the number of long cables connecting the control device and each device becomes very large.
There are problems such as an increase in cable installation space, noise and ease of control reliability, and difficulty in maintenance such as inspection and replacement of equipment.

In order to cope with this problem, it is conceivable to adopt a distributed control system in which a controller is constructed by combining a plurality of constituent units each having a device to be controlled connected thereto. That is, the devices of the X-ray fluoroscopy apparatus are divided into a plurality of groups, and the control devices are distributed and arranged in each group. However, in the case of the distributed control method, the CPU is mounted on each control device.
It is expected that the number of PUs used will increase and the probability of the CPU falling into a runaway state will increase. If the CPU falls into a runaway state during the diagnosis, the operation of the apparatus is disturbed, and there is a concern that, for example, the operating top plate cannot be stopped. Abnormal operation of the equipment accompanied by such mechanical movement impairs safety and must be avoided.

As a countermeasure, an automatic reset circuit is provided for a CPU that has gone out of control, and the CPU is automatically reset as soon as it goes into a runaway state to return the CPU to an initial state. However, even if the runaway CPU is returned to the initial state, the progress (data between each CPU) is not consistent with the other CPUs that have proceeded to the steps farther from the initial state. ,
The whole device does not return to the normal state. Therefore, in order to return the device to a normal state, the power of the entire device is turned off and then turned on again. However, once the apparatus is completely stopped, it takes a considerable time to return to the operable state again. In the case of fluoroscopy or the like, if the operation of the apparatus is interrupted for a long time due to the contrast agent administered to the patient, diagnosis will be hindered.

SUMMARY OF THE INVENTION In view of the above circumstances, it is a first object of the present invention to provide a medical diagnostic apparatus of a distributed control system in which a mechanical movement is automatically stopped when a CPU controlling a control goes out of control. In addition to the first problem, there is provided a medical diagnostic apparatus capable of returning the apparatus to a normal state without completely stopping the apparatus when the CPU controlling the control falls into a runaway state. 2 issues.

[0007]

The present invention has the following configuration in order to achieve the first object. That is, the medical diagnostic apparatus according to the first aspect includes a controller having a communication function capable of transmitting and receiving and a control CPU, and three or more component units in which a control target device is connected to the controller. A medical diagnostic apparatus constructed by connecting each controller in a ring shape by a control communication line for transmitting a control signal, wherein runaway detection means for detecting that the CPU of the controller has fallen into a runaway state is provided by each controller. The power supply means provided in each of the power supply units and supplies the drive power to the controlled device with mechanical movement and stops the supply of the drive power by the runaway detection signal from the runaway detection unit. And transmits a runaway detection signal generated by one of the controllers to other constituent units. An emergency transmission line is provided independently of the control communication line, and the power supply means detects a runaway sent from another component unit via the emergency transmission line. The supply of the driving power is also stopped by a signal.

According to a second aspect of the present invention, there is provided a medical diagnostic apparatus as set forth in the first aspect, wherein the CPU which resets the CPU in the runaway state to the initial state. Means and CPU standby means for keeping a non-runaway CPU in a standby state in response to generation of a runaway detection signal in another controller are provided in each controller, while the CPU which has fallen into a runaway state is reset to an initial state. Monitoring whether or not the CPU has returned, and when the return is detected, reloading the CPU which has returned to the initial state, reloading a control signal necessary for adjusting to the progress of the other waiting CPUs. The means are provided in a predetermined controller.

[0009]

The operation of the present invention is as follows. Claim 1
In the medical diagnostic apparatus of the invention described in the above, normally, a control signal for driving the control target device is transmitted through a control communication line that connects the controllers of the constituent units in a ring shape, and the operation of each constituent unit is performed. This is a distributed control method in which the number of cables is small. When the CPU runs away in the controller in one of the constituent units that construct the medical diagnostic apparatus, the power supply unit that supplies the driving power to the controlled device with mechanical movement in the specific constituent unit is used. for,
If the runaway CPU is of a specific component unit,
A runaway detection signal is immediately sent directly from the runaway detecting means in the unit, or via the emergency transmission line if the runaway CPU belongs to another constituent unit other than the specific constituent unit. Since the emergency transmission line is independent of the control communication line, transmission of the runaway detection signal is C
It is performed promptly without any hindrance by PU runaway. Upon receiving the runaway detection signal, the power supply unit immediately stops the power supply and immediately stops the mechanical movement of the controlled device.

[0010] In the medical diagnostic apparatus according to the second aspect of the present invention, the CPU that has gone out of control is automatically reset by the CPU reset means, and the non-runaway CPU is kept in the standby state by the CPU waiting means. However, in the predetermined controller, while the reloading means starts and monitors whether the runaway CPU has returned to the initial state, the controller continues to monitor whether or not the return to the initial state has been detected. The CPU that has returned to the state is reloaded with a control signal necessary to match the progress status of the other waiting CPU (to ensure data consistency). By reloading the control signal, the progress of all the CPUs is matched. Subsequently, a restart command is issued manually or automatically, and the operation of the medical diagnostic apparatus after the step at the time of the runaway is restarted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the medical diagnostic apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a main part configuration of the whole X-ray fluoroscopic apparatus according to the embodiment, and FIG. 2 is a schematic diagram showing that the embodiment apparatus is of a distributed control system. As shown in FIG. 1, the X-ray fluoroscopic apparatus according to the embodiment is roughly divided into four constituent units, namely, an operation unit 1, a main body unit 2, an exposure control unit 3, and a flash photography unit 4. I have.
The operation unit 1 includes a communication function capable of transmitting / receiving and a CP.
A controller 5 having a U (microprocessor) A is provided, and a control target device 6 is connected to the controller 5 (see FIG. 2). The control target device 6 driven and controlled by the controller 5 includes a monitor 7 for displaying an X-ray fluoroscopic image and an instruction of various operations such as setting of fluoroscopic / radiographic conditions or starting / stopping of fluoroscopic and starting of radiographic imaging. Switches, and lamps for displaying the operation status (status) of each device.
Further, the operation unit 1 is also provided with an emergency stop switch S1 which is used when the mechanical movement in the main unit 2 is urgently stopped.

The main unit 2 is provided with a controller 8 having a communication function capable of transmission and reception and a CPUB, and a control target device 9 is connected to the controller 8 (see FIG. 2). The control target device 9 driven and controlled by the controller 8 includes a collimator of an X-ray detection system composed of an X-ray tube 11 and an I / I tube 12 that are opposed to each other with a top plate 10 for mounting the subject M therebetween, The television camera 13 and the CCU (not shown) following the I-tube 12, the horizontal movement of the top 10, the tilting of the base on which the top 10 is mounted, and the X-ray tube 11 and I / I An electric motor type moving mechanism 14 for interlocking the pipes is exemplified. This electric motor type moving mechanism 1
4 is supplied with driving power from a power supply unit 15. Further, the main unit 2 itself is also provided with an emergency stop switch S2 used for urgently stopping mechanical movement in the main unit 2. The emergency stop switch S2 has the same function as the emergency stop switch S1 of the operation unit 1.

The irradiation control unit 3 is provided with a controller 16 having a communication function capable of transmitting and receiving and a CPUC, and a controller 17 is connected to the controller 16. The control target device 17 includes a high-voltage power supply.

The flash photography unit 4 is provided with a controller 18 having a communication function capable of transmitting and receiving and a CPUD, and a control target device 19 is connected to the controller 18 (see FIG. 2). Examples of the control target device 19 that is driven and controlled by the controller 18 include an electric motor type film transport mechanism 20 and a mechanism (not shown) for printing a transmission X-ray image on a film.

On the other hand, the controller 5 of each constituent unit
Regarding 8, 16, and 18, the control communication line 2 is arranged in the order of the controller 5 of the operation unit 1 → the controller 8 of the main unit 2 → the controller 16 of the exposure control unit 3 → the controller 18 of the rapid photography unit 4.
2 to 25 are connected in a ring shape, and control signals are transmitted between the controllers via the control communication lines 22 to 25, so that the operation of each component unit proceeds. In the case of the embodiment, optical fibers are used for the control communication lines 22 to 23,
An electric cable may be used as the communication line.

On the other hand, the operation unit 1 → the main unit 2 →
In the order of the exposure control unit 3 → the rapid shooting unit 4, the constituent units are also connected in a ring shape by the emergency transmission lines 26-29, and each controller is connected via the emergency transmission lines 26-29. CPUA ~
When at least one of D falls into a runaway state, transmission for immediately stopping the drive power supply of the power supply unit (power supply means) 15 of the main unit 2 is performed. In the case of the embodiment, the emergency communication lines 26 to 29
Although an electric cable is used, an optical fiber may be used for a transmission line.

Next, an example of the configuration around the controller in each unit will be described mainly with reference to FIG. The controllers in the unit are CPUA to D, RO
M31, memory 32, DMA (dynamic memory
Access) A controller 33, a timer 34, a flag setting register 35, and a runaway detection / CPU reset circuit 36 are connected to each other via a bus line Bu as necessary. The basic operation of the controller follows an operation program stored in the ROM 31. The light control signal sent from another controller is converted into an electric signal by the photoelectric conversion circuit 37, input via the communication interface 38, and stored in the memory 32 or the like as necessary. The timer 34 is used for a time measurement operation or the like. The DMA controller 33 is used when directly storing and reading the memory 32 from outside the controller without passing through the CPU.

On the other hand, necessary control signals are sent to the control target device via the input / output interface 39. In addition, a feedback signal or the like indicating the momentary status of the controlled device is input to the controller via the input / output interface 39 and stored in the memory 32 as necessary. After being converted into an optical signal by the photoelectric conversion circuit 37 via the photoelectric conversion circuit 37, the optical signal may be transmitted to another controller. The controller can communicate with the outside by having the communication interface 37 (has a communication function).

FIG. 5 shows an example of a control signal transmitted / received between the controllers. “SF” is a start flag indicating the start of information, and “EF” is an end flag indicating the end of information. The “destination identification address” indicates to which constituent unit the controller of the signal destination belongs, and is composed of, for example, a two-digit number. The “source identification address” indicates to which constituent unit the controller that performs information transmission belongs, and is composed of, for example, a two-digit number. The “code” indicates an operation instruction or an operation state to be performed by the component unit of the transmission destination, and is configured by, for example, a three-digit number. For example,
The instruction to move the top board 10 horizontally is predetermined such as "001", and the instruction to start capturing an X-ray transmission image is predetermined such as "301".

"Data" indicates information added to the code (for example, the direction and speed of movement of the top 8). The “destination identification address”, “source identification address”, “code”, and “data” are set by the source controller. It is preferable that the controller at the transmission destination also has a configuration for returning a signal (acknowledge signal) indicating that the transmission has been received to the transmission source.

In many cases, the source is the operation unit 1. For example, it sends a signal as to whether the control communication line is functioning properly or sends a signal instructing the operation of the device to be controlled in each component unit. From constituent units other than the operation unit 1, status signals and the like indicating the states of various device operations are sent to the operation unit 1. Further, for example, when an angiographic agent is used, control signals are exchanged only between the main unit 2 and the exposure control unit 3, and the operation proceeds by the cooperation between the main unit 2 and the irradiation control unit 3. Sometimes you do.

Next, a configuration relating to an operation which occurs in accordance with runaway of the CPU in each unit, which is a feature of the present invention, will be described with reference to FIGS. 3 and 4. FIG. The runaway detection / CPU reset circuit 36 functions to detect runaway and output a runaway detection signal when the CPU falls into a runaway state, and to apply a reset to the CPU to return the runaway CPU to its initial state. . For example, runaway detection
While a watchdog timer 36a provided in the CPU reset circuit 36 always measures the time,
From the terminal 36
b, the reset start is continuously applied to the watchdog timer 36a.
If the PU goes into a runaway state, the clear signal is not output and the reset start is not applied to the watchdog timer 36a, so the carry signal (carry signal) from the terminal 36c.
Is output. This carry signal is the reset signal C
It is configured to be sent to the PU. That is, the runaway CPU is automatically reset at the same time as the runaway is detected. On the other hand, at the same time when the carry signal is output from the watchdog timer 36a, the terminal 36d of the runaway detection / CPU reset circuit 36 is inverted from "H" to "L". Runaway detection / CPU reset circuit 36
The period during which the terminal 36d is at "L" is the runaway detection signal generation period. Of course, as the CPU during the runaway returns to the initial state and the runaway is resolved, the terminal 36d is again inverted from "L" to "H", and the runaway detection signal disappears.

On the other hand, the respective constituent units 1 to 4 are provided with AND circuits 41 to 44, respectively. As shown in FIG. 4, the outputs of the AND circuits 41 to 44 are transmitted by the emergency transmission lines 26 to 29. AND circuits 41 to 41 of the next unit
44 is connected to one side input. On the other hand, as shown in FIG.
Are connected to the other inputs of the AND circuits 41 to 44, so that a runaway detection signal is input.
The outputs of the AND circuits 41 and 42 include resistors R 1 and R
2, a constant voltage E corresponding to the "H" level is supplied, and as long as the emergency stop switches S1 and S2 are not pressed, the one-side input of the AND circuits 42 and 43 is set to "H".
To maintain. If the respective CPUs do not run away, the terminal 36d of the runaway detection / CPU reset circuit 36 remains "H", so that the outputs of the AND circuits 41 to 44 all become "H". That is, if the outputs of the AND circuits 41 to 44 are “H”, it means that there is no CPU running out of control and is in a normal state.

However, when one of the CPUs of the controllers goes out of control, the other input of one of the AND circuits 41 to 44 becomes "L", and the output of the AND circuit is inverted to "L". Then, one side input of the next AND circuit becomes “L”. As a result, the outputs of all the AND circuits become “L”. In other words, if the outputs of the AND circuits 41 to 44 are "L", it means an emergency state in which at least one CPU is running away. If the runaway CPU returns to the initial state and the runaway detection signal disappears, the other input of the AND circuit is inverted from “L” to “H”, and each A
The outputs of the ND circuits 41 to 44 all return to “H”.

It is to be noted that only the main unit (specific configuration unit) 2 has the terminal 36d of the runaway detection / CPU reset circuit 36 connected to the power supply unit 15, and the runaway detection signal generated by the main unit 2 is directly transmitted. And the runaway detection signal generated by another component unit is also transmitted to the power supply unit 1 via the emergency transmission line.
5 is introduced. The power supply unit 15 is configured to stop the supply of the driving power when receiving the runaway detection signal (for example, a circuit that opens the relay contact and cuts off the supply of the driving power when receiving the runaway detection signal). To the power supply unit 15
Is provided). Therefore, when the runaway of the CPU starts, the runaway detection signal is transmitted to the power supply unit 15, the supply of the driving power is immediately cut off, and the mechanical movement in the main unit 2 automatically stops immediately.

On the other hand, the output of each of the AND circuits 41 to 44 is
It is connected to the bus line Bu of each controller, and a runaway detection signal is transmitted from another component unit to the CPU via the emergency transmission line. When the non-runaway CPU receives the runaway detection signal, it immediately sets a flag “1” in the register 35 indicating that the CPU is in a standby state, and enters a standby state. However, in the controller (predetermined controller) 5 of the operation unit 1, the reloading means is started, and starts monitoring whether or not the runaway CPU has returned to the initial state. That is, it monitors whether the output of the AND circuit 41 has returned to “H”. And AND circuit 4
When the output of 1 returns to "H", it is detected that the runaway CPU has returned to the initial state, and it is necessary for the CPU that has returned to the initial state to match the progress step of the other CPU on standby. Reload information such as control signals. In order to reload necessary information, it is necessary to specify the CPU to which the runaway CPU belongs. This is because the operation unit 1 sets the flag “1” in the register 35 of each controller. A control signal for checking whether or not the flag “1” has not been set in the register 35 is determined as a runaway CPU, and a control signal (information, ) Is sent again from the operation unit 1 and other units to the CPU in the initial state. The reloading means is constituted by the CPUA of the controller 5, a control program and the like.

With the end of the reload processing for the CPUs in the initial state, the progress status (data) of all CPUs is matched. Subsequently, a restart command is issued manually or automatically, and the operation of the medical diagnostic apparatus after the step at the time of the runaway is restarted. Even if the apparatus is not completely stopped, all the CPUs can be restarted in a state where matching has been achieved, and can be returned to a normal state.

Finally, the emergency stop switches S1 and S2 will be described. The switches S1 and S2 are manually closed when it is desired to stop the mechanical movement of the main unit 2 for some reason. When the emergency stop switch S1 is closed, the output of all the AND circuits 41 to 44 becomes "L" in response to the one-side input of the AND circuit 42 being inverted to "L". Similarly to the above, the supply of the driving power from the power supply unit 15 is immediately cut off, and the mechanical movement in the main unit 2 is automatically stopped. At the same time, all the CPUs are in a standby operation. However, since there is no CPU that has gone out of control, the CPU is not reset or reloaded. Emergency stop switch S1
Is opened, the output of one of the AND circuits 42 returns to “H”, and the outputs of all the AND circuits 41 to 44 become “H”. Upon restart, all CPUs immediately return to the matched state. The operation and operation of the emergency stop switch S2 are exactly the same as those of the emergency stop switch S1, except that the installation location is different.

Next, the operation at the time of CPU runaway, which is a characteristic configuration of the X-ray fluoroscopic apparatus of the embodiment described above, will be described by taking the case where the CPUB of the main unit 2 falls into a runaway state as an example. This will be described below with reference to the flowchart of FIG. [Step S1] It is assumed that it is detected that the CPUB of the main unit 2 has gone out of control while the patient is placed on the top 10 and the diagnosis is being performed.

[Step S2] A carry signal is output from the terminal 36c of the runaway detection / CPU reset circuit 36 of the main unit 2, and the CPUB is reset. At the same time, the terminal 36d of the runaway detection / CPU reset circuit 36 changes from “H” to “L”, and the runaway detection signal
2 emergency transmission line 26 as it is sent to the other input
The output of each of the AND circuits 41 to 44 is inverted from “H” to “L” through to 29.

[Step S3] Each of the AND circuits 41 to 4
The operation unit 1 and the exposure control unit 3 that have received the transmission of the runaway detection signal due to the output of the control unit 4 being inverted to “L”.
Each of the CPUs A, C, and D of the rapid photography unit 4 sets a flag "1" in the register 35, and at the same time, enters a standby state. On the other hand, since the power supply unit 15 that has received the runaway detection signal simultaneously in the main unit 2 immediately stops supplying the driving power, the mechanical movement of the top plate 10 of the main unit 2 is immediately stopped. .

[Step S4] After a lapse of a predetermined time, the runaway CPUB returns to the initial state.
When the terminal 36d of the reset circuit 36 changes from “H” to “L” and the runaway detection signal disappears and the other input of the AND circuit 42 returns to “H”, all the outputs of the AND circuits 41 to 44 become “L”. "" To "H" to notify the end of runaway of CPUB. Each of the CPUs A, C, and D releases the standby state.

[Step S5] On the other hand, the main unit 2
Reload means in the controller 5 of the AND circuit 4
When detecting that the output of 1 is inverted to "H", the controller 5 checks the register 35 of the other controller to find out that the runaway CPU is CPUB, and immediately reloads necessary information.

[Step S6] By reloading the CPUB, the progress status (data) of the CPUs A to D of each controller is matched.

[Step S7] The apparatus is restarted manually or automatically, and the operation of the apparatus after the time when the runaway occurs is restarted.

The present invention is not limited to the above embodiment, but may be modified as follows, for example. (1) In the above embodiment, an X-ray fluoroscopic apparatus is used. However, the medical diagnostic apparatus of the present invention can be applied to an X-ray CT apparatus, a magnetic resonance tomography apparatus, or the like.

(2) In the above embodiment, the number of constituent units is four, but the X-ray fluoroscopic apparatus is composed of three constituent units or five or more constituent units. Needless to say, this may be done.

(3) In the above embodiment, the signal of the emergency stop switch is also sent via the emergency transmission line for sending the CPU runaway detection signal. The lines for sending the signal of the stop switch may be different lines. However,
If the emergency transmission line also serves to transmit two signals, the wiring can be simplified, which is convenient.

[0039]

As is clear from the above description, the medical diagnostic apparatus according to the first aspect of the present invention is a distributed control system in which control is performed using three or more distributed controllers. There are many advantages, such as fewer cables and shorter cable lengths, making it difficult for noise to occur and easy maintenance.In addition, when the CPU goes out of control, the power to the controlled device with mechanical movements is reduced. The supply is immediately shut off and its movement is stopped, thus increasing the safety of the device.

According to the medical diagnostic apparatus of the second aspect of the present invention, in addition to the above-described effects, the CPU that has runaway
Automatically returns to the initial state and the necessary information is automatically reloaded, and the progress status of all CPUs is automatically matched, so that the apparatus can be normally operated without completely stopping the apparatus. It can be quickly returned to the state.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a main configuration of an entire X-ray fluoroscopic apparatus according to an embodiment.

FIG. 2 is a schematic diagram showing that the embodiment apparatus uses a distributed control method.

FIG. 3 is a block diagram showing a schematic configuration around a controller of the configuration unit.

FIG. 4 is a circuit diagram illustrating a schematic configuration around an emergency transmission line in the embodiment device.

FIG. 5 is an explanatory diagram showing an example of a control signal transmitted / received via a control communication circuit.

FIG. 6 is a flowchart showing the operation of the apparatus when the CPU runs away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Operation unit as a constituent unit 2 ... Main body unit as a constituent unit 3 ... Exposure control unit as a constituent unit 4 ... Rapid photography unit as a constituent unit 5, 8, 16, 18 ... Controller 6, 9, 17, 17 19 ... Control target equipment 15 ... Power supply unit 22,23,24,25 ... Control communication line 26,27,28,29 ... Emergency transmission line 36 ... Runaway detection / CPU reset circuit

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-189134 (JP, A) JP-A 1-238831 (JP, A) JP-A 2-261433 (JP, A) JP-A-1- 232940 (JP, A) JP-A-63-222741 (JP, A) JP-A-2-152442 (JP, A) JP-A 8-299317 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) A61B 6/00-6/12

Claims (1)

(57) [Claims] 1. A communication function capable of transmitting and receiving and a control CP
While three or more component units in which a control target device is connected to a controller having a U are combined,
A medical diagnostic apparatus constructed by connecting each controller in a ring by a control communication line for transmitting a control signal to the controller.
Is provided in each of the controllers, and supplies drive power to a device to be controlled involving mechanical movement, and detects a runaway detection signal from the runaway detection unit. Power supply means for stopping the supply of driving power is provided in a specific component unit, and an emergency transmission line for transmitting a runaway detection signal generated by one of the controllers to another component unit is provided for the control unit. The power supply means is provided independently of the communication line, and the power supply means also supplies the drive power by a runaway detection signal sent from another component unit via the emergency transmission line. A medical diagnostic apparatus configured to stop supply.