JP2586262B2 - X-ray controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray control apparatus, and more particularly to an improvement in an X-ray control apparatus suitable for a battery-operated X-ray control apparatus requiring small size, light weight, and low power consumption.

[0002]

2. Description of the Related Art A conventional X-ray controller for battery rounding comprises a clock generator, a microprocessor, an interrupt controller, a bus arbiter, a program memory, an input / output IC, an A / D converter, a D / A converter, and the like. The microcomputer is used to set, change, and display the tube voltage / tube current time product, and to manage the short-time rating of the X-ray tube and the device rating.

[0003]

However, as in the prior art, a microcomputer is used for setting, changing, and displaying the tube voltage / tube current time product and managing the short-time rating of the X-ray tube and the device rating. However, there is a problem in that it is over-specified, the number of parts increases, it is difficult to reduce the size and weight, and the cost increases. Further, in the control by the microcomputer, there is also a problem that extra power is consumed because the microcomputer must always be operated even if the set tube voltage value change key or the set tube current value change key is not pressed. is there.

[0004] In view of the above, the present invention can reduce the number of parts, reduce the size and weight, and can reduce the cost. Further, the set tube voltage value change key and the set tube current value change key can be pressed. It is an object of the present invention to provide an X-ray control device improved so that it can be operated only when the operation has been performed and power consumption can be reduced.

[0005]

In order to achieve the above object, in an X-ray control apparatus according to the present invention, a first switch for changing a set tube voltage value and a second switch for changing a set tube current time product value are provided. Switch, a detection circuit for detecting that the first and second switches are operated, a first holding circuit for holding the input tube voltage value signal, and an input tube current time product value A second holding circuit for holding signals, and a tube voltage value signal and a tube current time product value signal are input from the first and second holding circuits, and a presettable tube voltage value is stored in each address. And only when the switch operation is detected by the detection circuit described above,
During the period when the switch is operated, the read address is automatically changed sequentially from the address corresponding to the tube voltage value signal input from the first holding circuit, and the tube voltage value stored at the address is changed. When the value read from the changed address deviates from the rating based on the tube voltage value signal and the tube current time product value signal output to the first holding circuit and input from the first and second holding circuits. A read-only tube voltage value storage ROM for preventing the above address change and a tube voltage value signal and a tube current time product value signal from the first and second holding circuits are input. A tube current time product value which can be set in advance is stored in the address, and is activated only when the switch operation is detected by the detection circuit. The read address is automatically changed sequentially from the address corresponding to the tube current time product value signal input from the holding circuit of the above, and the tube current time product value stored at that address is output to the second holding circuit. When the value read from the changed address deviates from the rating based on the tube voltage value signal and the tube current time product value signal input from the first and second holding circuits, the above address change is not performed. A read-only ROM for storing a tube current time product value, a means for controlling a tube voltage based on a tube voltage signal from the first holding circuit,
Means for receiving a tube voltage value signal and a tube current time product value signal from the second holding circuit and displaying a set tube voltage value and a set tube current time product value; and a tube current time product from the second holding circuit. And a timer circuit for generating an X-ray cutoff signal when a value signal is input and reaches the tube current time product value. A settable value of the tube voltage value and the tube current time product value is stored in advance at each address of a read-only ROM, and these ROMs have first and second values for changing the address and reading different values. Only when it is detected that the switch is operated, the operation state is set, so that power consumption can be reduced. In these ROMs, a tube voltage value signal and a tube current time product value signal are input from the first and second holding circuits, and from the addresses corresponding to the tube voltage value signal and the tube current time product value signal, Since the address is changed, the tube voltage and the tube current time product are changed from the previous set values. Normally, these setting values do not change much, so changing the value based on the previous setting value can reduce the time required for the change operation and simplify the setting operation. it can. Further, based on the tube voltage value signal and the tube current time product value signal from the first and second holding circuits input to the ROM, when the value read from the changed address goes out of the rating, the address is not changed. Since the setting is not performed, inappropriate setting due to an operation error can be prevented. In this way, the display and display of the set tube voltage value and the set tube current time product value without using a microcomputer
Changes and management of short-time rating and device rating of the X-ray tube can be performed, so that the number of parts can be reduced and the size and weight can be reduced.

[0006]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1, FIG. 2 and FIG. 3 are block diagrams showing respective parts of the X-ray control device according to one embodiment of the present invention. First, FIG. 1 shows a part for setting and changing, and as shown in FIG.
To 14 are provided. The key switches 11 and 12 are for setting and changing the tube voltage (KV) value. When the key switch 11 is pressed, a KV + signal that changes to the plus side is generated, and when the key switch 12 is pressed, the value changes to the minus side. A KV- signal results. The key switches 13 and 14 are for setting and changing the tube current time product (mAs) value. When the key switch 13 is pressed, the value changes to the plus side.
An As + signal is generated, and pressing the key switch 14 generates a mAs- signal that changes to the minus side.

When any one of these key switches 11 to 14 is pressed, one of the KV + signal, the KV- signal, the mAs + signal and the mAs- signal goes low, as shown in FIG. These signals are initially H at time a and low at time b when pressed. Then, at this point b, the output of the OR circuit 21 becomes H as shown in FIG.
, And the key-on signal output from the inverting circuit 22 becomes L
become. That is, when the key-on signal becomes L,
It means that any key switch has been pressed. O
The output of the R circuit 21 is sent to the one-shot circuit 23,
As shown in (f) of FIG. 4, a latch signal which becomes L for a certain period of time from the point b at which the output of the OR circuit 21 becomes H is output.

FIG. 2 shows a storage and output unit of the X-ray control device.
41, and latch circuits 32 and 42 are provided. R
The OM 31 and the latch circuit 32 are for KV,
1 and the latch circuit 42 are for mAs. That is, R
A tube voltage value that can be set in advance is written in the OM 31 as a value in units of 1 KV, for example, from 40 KV to 125 KV. A settable tube current time product value is written in the ROM 41 for each position from, for example, 0.5 mAs (position 1) to 125 mAs (position 25). These values are written when the device is shipped or adjusted.

When the key-on signal is L (from the point b), the ROMs 31 and 41 enter an operating state, and an address signal is input as shown in FIG. 4D (the left terminal in the figure is an address input terminal). Thus, the value read from the specified address (the output terminal is on the right side) is output from the time point c as shown in FIG. This output signal is sent to the latch circuits 32 and 42,
The latch signal is latched at the timing when the latch signal changes from L to H (d). Then, as shown in FIG. 4 (g), at time e, the set tube voltage value signal and the set tube current time product value signal are output from the latch circuits 32 and 42. The set tube voltage value signal and the set tube current time product value signal are sent to the ROMs 31 and 41 as a part of the address signal, respectively, and are taken in as an address input at a time point f.

That is, in the ROM 31, the address is changed from the address specified by the previously set tube voltage value signal by the KV + signal and the KV- signal, and 1 KV is added when the KV + signal becomes L. The read tube voltage value signal is read out, and when the KV- signal becomes L, a tube voltage value signal minus 1 KV is read out. In the ROM 41, the address is changed from the address specified by the previously set tube current time product value signal by the mAs + signal and the mAs- signal, and when the mAs + signal becomes L, the position is changed to the one position plus side. Is read out, and when the mAs-signal becomes L, a tube current time product value signal minus one position is read out.

When the device rating is as shown in FIG. 5 and the short-time rating of the tube is as shown in FIG. 6, the output as described above is stored in the ROM 3 as long as these ratings are satisfied.
1 and 41. Since the set tube voltage value signal and the set tube current time product value signal are input to the ROMs 31 and 41 as address signals, it is determined whether or not the values are within the rated range. . In other words, when setting to exceed these ratings, for example, pressing the key switch 11 and pressing the KV
Even if a + signal is input, the KV value does not output a value obtained by adding 1 KV, and the KV value corresponding to the maximum value of the previously set rating is output.
As the value is read, the KV value and the mAs value are not added or subtracted at the rated end.

The set tube voltage value signal and the set tube current time product value signal thus latched by the latch circuits 32 and 42 are:
As shown in FIG. 3, it is sent to the set tube voltage display circuit 60 and the set tube current time product display circuit 70, respectively. These display circuits 60 and 70 are three-digit numerical displays 65 to 67 and 75.
To 77, its driving circuits 62 to 64, 72 to 74, and 2
The set tube voltage signal and the set tube current time product signal
Conversion circuits 61 and 71 are provided for converting the value to the decimal value, and each set value is displayed as a three-digit decimal number.

The set tube voltage signal is also sent to the D / A conversion circuit 51 of the X-ray tube voltage control circuit, and a tube voltage according to the set value is generated. The set tube current time product value signal is sent to the tube current time product timer circuit 80. The tube current time product timer circuit 80 converts a set tube current time product value signal into a count value of the timer circuit 82.
1 and a timer circuit 82. The timer circuit 82 starts counting in response to the X-ray exposure signal, and when the count value reaches the count value output from the conversion circuit 81, the X-ray Generate a shutoff signal.

Before any of the key switches 11 to 14 is pressed (time point a), the key-on signal is maintained at H. When the key switch is released at time point g after being pressed, no key is pressed. Then, the key-on signal returns to H. ROM3
Reference numerals 1 and 41 are activated only when the key-on signal is low, and are inactive when the key-on signal is high, so that only a small amount of power is consumed. The ROMs 31 and 41 consume the most power among the various ICs having this circuit configuration. However, since the ROMs 31 and 41 are configured to consume no power unless the key switches 11 to 14 are pressed,
Overall power consumption can be reduced.

In this embodiment, a 128-kbyte EPROM is used as the ROMs 31 and 41. However, any memory having a larger capacity can be used. The ROM 31 for storing the settable tube voltage value and the ROM 41 for storing the settable tube current time product value each have 8 ROMs.
Although a ROM with a bit output is used, if a ROM with a 16-bit output is used, these two ROMs 31 and 41 are stored in one ROM.
One ROM can be used.

In the above embodiment, the settable tube voltage value is 4
There are 85 positions in 1 KV increments from 0 KV to 125 KV. Therefore, for example, the tube voltage value is changed from 40 KV to 12 KV.
When changing to 5 KV, it is necessary to press the key switch 11 85 times, and the operability is poor. So the second
In this embodiment, this is improved to improve the operability.

In the second embodiment, as shown in FIG. 7, the output of an OR circuit 21 to which signals from key switches 11 to 14 are input is sent to an oscillation circuit 24 with a gate to obtain a square-wave key pulse signal. Thus, the tube voltage value is continuously changed by the key pulse signal. In FIG. 7, the same parts as those of the first embodiment are omitted, and only different parts are shown. The gated oscillation circuit 24 is mainly composed of four inverting amplifier circuits, and starts oscillating when the input becomes H. The oscillation frequency f1 is determined by the values of the capacitor C and the resistor R: f1 = 1 / ( 2.2 × C × R), and the cycle T1 is T1 = 1 / f1.

Here, the key switch 11 is depressed and FIG.
Description will be made assuming that the KV + signal has become L (point b in FIG. 8) as shown in FIG. At this time, the output of the OR circuit 21 becomes H as shown in FIG. 8B, and the key-on signal becomes L as shown in FIG. . When the key-on signal becomes L, the ROM 31 enters the operating state as shown in FIG. At this time, the set tube current time product value signal and the set tube voltage value signal applied to the address input terminal on the left side (FIG. 7) of the ROM 31 are taken in as address inputs as shown in FIG. , KV + signals are stored in the ROM 31
, A value one position higher than the value designated by these address inputs is read out, and from the data output terminals D0 to D6 on the right side of FIG. And is input to the latch circuit 32. Another data output terminal D7 of the ROM 31
Are data output terminals D0-D as shown in FIG.
It goes high only while the output from 6 is occurring.

On the other hand, when the output of the OR circuit 21 becomes H, the gated oscillation circuit 24 starts oscillating, and generates a square-wave key pulse signal having a period T1 as shown in FIG. This key pulse signal is inverted by the inverting circuit 29 to become an inverted key pulse signal as shown in FIG.

The key pulse signal is sent to an AND circuit 26, and the other input terminal of the AND circuit 26
The output of the R circuit 21 has been sent. Since the output of the OR circuit 21 is H from the time point b, the output of the AND circuit 26 is equivalent to the key pulse signal. The output of the AND circuit 26 is sent to the clock terminal of the flip-flop 27, and in response to the rise of the AND circuit 26, the output of the Q terminal of the flip-flop 27 becomes H as shown in FIG.

The Q of the flip-flop 27 which has become H
The terminal output is sent to the AND circuit 28, and the above-mentioned inverted key pulse signal is sent to the other input of the AND circuit 28.
Is obtained, and this signal is sent to the latch circuit 32 as a latch signal. In response to the rise of the latch signal (time d), the latch circuit 32 holds the signal input from the ROM 31 and, at time e, as shown in FIG. Output as

The new set tube voltage value signal is applied as an address input to the ROM 31 from the time point f, as shown at (e) in FIG. 8, and the value further advanced by one position from the ROM 31 is applied to (f) in FIG. ) Is output from the point in time g. The gated oscillation circuit 24 continues to oscillate, and when the inverted key pulse signal becomes H again, A
Since the latch signal from the ND circuit 28 becomes H, this R
The value newly output from the OM 31 is latched by the latch circuit 32 at this time, and is output as the set tube voltage value signal at the time i. Then, the new set tube voltage signal is added as an address input to the ROM 31 from the point in time j, and the operation is repeated, so that the set tube voltage signal automatically increases by one position.

The output of the data output terminal D7 of the ROM 31 is input to the AND circuit 91 together with the inverted key pulse signal. As a result, the output of the AND circuit 91 is output only when both inputs are at H level as shown in FIG. (H) as shown in FIG. The output of the AND circuit 91 is sent to the clock terminal of the counter 92, and the counter 92 performs a counting operation in response to the rising edge. First, at the time point d, the counter 92 counts "1", and its QA output terminal becomes H as shown in FIG.

The output of the AND circuit 91 goes low in response to the data output terminal D7 of the ROM 31 going low, and then the output terminal D7 goes high, and at time h, the inverted key pulse signal goes high again. When it becomes, it becomes H. In response, the counter 92 counts “2” and its QA
When the terminal becomes L as shown in FIG.
The output terminal becomes H as shown in FIG.

This operation is repeated, and the set tube voltage signal automatically increases by one position, and the count of the counter 92 increases by one. The repetition cycle at this time is determined by the oscillation cycle T1 of the gated oscillation circuit 24. When this operation is repeated five times, the counter 92 counts "5", and its QA output terminal and QC output terminal both become H from the time point m as shown in FIGS. As a result, the output of the AND circuit 93 to which these are input becomes H. The output of the AND circuit 93 is applied to the clock terminal of the flip-flop 94, and the inverted Q output terminal of the flip-flop 94 becomes L from the time point m as shown in FIG.

Then, the switch 25 of the gated oscillation circuit 24 is turned on, and the resistor R is connected in parallel with the resistor R1. Therefore, this gated oscillation circuit 2
The oscillation frequency of No. 4 is changed to f2 shown in the following equation. f2 = 1 / [2.2 × C × {R × R1 / (R + R1)}] The oscillation cycle T2 is T2 = 1 / f2. If R, R1> 0, then T2 <T1,
As shown in FIG. 8 (g), the oscillation cycle becomes shorter, and the speed at which the tube voltage set value is changed becomes faster. Therefore, if the key switch 11 is kept depressed, the tube voltage set value increases at a relatively slow speed up to the fifth position, and increases at a high speed after the sixth position.

When the key switch 11 is released when the desired tube voltage set value is reached, the KV + signal goes high and the output of the OR circuit 21 goes low. Then, the gated oscillation circuit 24
Stops the oscillation, and as a result, the change of the tube voltage set value is stopped (time k in FIG. 8). When the output of the OR circuit 21 becomes L, the output (key-on signal) of the inverting circuit 22 becomes H and R
The operation of the OM 31 is stopped. At this time, the set tube voltage signal output from the latch circuit 32 is the value last latched by the latch circuit 32 (at the time point n).

In the second embodiment, the key switch 11,
12 continuously changes the set tube voltage value signal by pressing and holding any one of them, and when the position is continuously changed by a certain number of positions, the change speed is increased. The product value can be changed continuously by pressing any one of the key switches 13 and 14, and the change speed can be increased from a certain point in time. The ROM 41 and the latch circuit 42 in FIG.
This is possible by adopting a configuration similar to the above.

[0029]

As described above, according to the X-ray control apparatus of the present invention, the change of the set tube voltage value, the set tube current time product value, the display, and the X-ray tube can be performed without microcomputer control. It is possible to manage short-time ratings and device ratings, etc., and it is possible to reduce the size and weight by reducing the number of parts and to make it inexpensive, so it is suitable for low-cost X-ray control devices such as chest-dedicated radiographing devices. is there. Further, the failure rate can be reduced with a decrease in the number of parts. Further, since the ROM for storing the tube voltage value and the ROM for storing the tube current time product value are turned on only when a switch for changing the read address and changing the set value is turned on, power consumption can be reduced. Since low power consumption can be achieved in this manner, the number of times of charging the battery can be reduced, and the life of the battery can be extended. Since the change of the read address in the ROM for storing the tube voltage value and the tube current time product value is changed from the previous address, it is actually consistent that the set value usually does not change much, The change operation does not take much time, and the operability is improved. The output from the holding circuit that holds the value read from these ROMs is input to the ROM for storing the tube voltage value and the tube current time product value, and the value read from the changed address is rated. When the address deviates, the address is not changed, so that setting outside the rating can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram of a part of an embodiment of the present invention.

FIG. 2 is a block diagram of another portion of the embodiment.

FIG. 3 is a block diagram of the rest of the embodiment.

FIG. 4 is a time chart for explaining the operation of the embodiment.

FIG. 5 is a graph showing device ratings of the embodiment.

FIG. 6 is a graph showing a short-time rating of the X-ray tube of the embodiment.

FIG. 7 is a block diagram of a part of a second embodiment of the present invention.

FIG. 8 is a time chart for explaining the operation of the second embodiment.

[Explanation of symbols]

 11 to 14 key switch 21 OR circuit 22, 29 inversion circuit 23 one-shot circuit 24 gated oscillation circuit 26, 28, 91, 93 AND circuit 27, 94 flip-flop 31, 41 ROM 32, 42 latch circuit 51 D / A conversion Circuit 60 Set tube voltage display circuit 70 Set tube current time product display circuit 80 Tube current time product timer circuit 92 Counter

Claims (1)

(57) [Claims] 1. A first switch for changing a set tube voltage value, a second switch for changing a set tube current time product value,
A detection circuit for detecting that the first and second switches have been operated, and a first circuit for holding the input tube voltage value signal
Hold circuit and hold input tube current time product value signal
A second holding circuit and a pipe from the first and second holding circuits;
The voltage value signal and the tube current time product value signal are input,
A preset tube voltage value is stored at each address.
Only when the switch operation is detected by the above detection circuit
In the operating state, the period when the first switch is operated
While the tube voltage signal input from the first holding circuit
Automatically read addresses sequentially from the corresponding address
Change the tube voltage value stored at that address to
Output to the first holding circuit and the first and second holding circuits
Based on the tube voltage signal and the tube current time product signal
The value read from the changed address
Make sure that the above address change is not
A read-only tube voltage value storage ROM,
1. The tube voltage value signal and the tube current time product from the second holding circuit
Value signal is input and set in advance to each address
The possible tube current time product values are stored and
Only when switch operation by road is detected,
During the period when the switch No. 2 is operated, the second holding
Address corresponding to the tube current time product signal input from the
The read address is automatically changed sequentially from the
The tube current time product value stored in the dress is stored in the second
Output to the holding circuit and input from the first and second holding circuits.
Based on the detected tube voltage signal and tube current time product signal.
If the value read from the updated address goes out of the rating
To prevent the above address change from being performed.
And a ROM for storing a tube current time product value dedicated to output
Controls the tube voltage based on the tube voltage signal from the holding circuit.
Means for transmitting a tube voltage value signal from the first and second holding circuits.
Signal and tube current time product signal are input and set tube voltage value and
Means for displaying the set tube current time product value, and the second holding
Is inputted tube current time product value signal from the circuit, X-rays controller, characterized in that it comprises a timer circuit for generating an X-ray cutoff signal when reaching the tube current time product value.