JPH0244538B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an X-ray diagnostic device, and more particularly to an X-ray diagnostic device that is most suitable for mass medical examinations and the like.

For example, in mass gastrointestinal examinations, a large number of examinees (also referred to as subjects) are diagnosed based on a formalized diagnostic routine. Conventionally, in these fields, X-ray radiographers (hereinafter also referred to as operators) have been required to operate the X-ray generator, such as manually setting the radiography conditions, or to determine the radiographing position, such as operating the X-ray fluoroscopy table, independently (for each radiograph). I was gone. For this reason, a lot of time is required for diagnosis, and in addition to that, considering the time spent dealing with patients, the burden on the X-ray technician becomes large, and in some cases, multiple technicians may be required. There was a problem. Furthermore, the patient is also burdened with unnecessary exposure to X-rays when determining the imaging position.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an X-ray diagnostic apparatus that can significantly shorten the time for imaging positioning and reduce the exposure dose of the patient. It is.

The present invention will be specifically explained below using Examples.

FIG. 1 is a system block diagram showing an embodiment of the X-ray diagnostic apparatus of the present invention. Note that among the signal lines, thin lines are single signal lines, thick black lines are multiple signal lines, and thick white lines are binary signal lines. This X-ray diagnostic apparatus includes an operation panel 1 having a plurality of push button switches SW ₀ to _{SW 17} , and three types of signals from the operation panel 1, namely, an imaging mode selection signal S ₁ by switches SW ₁ to _{SW 9} ; The physique data selection signal S ₂ from SW ₁₀ to _{SW 15} and the system mode control signal S ₀ from switches SW ₀ , SW ₁₆ , and SW ₁₇ are latched, and three types of output signals corresponding to the latched signals are output at predetermined timings. A latch circuit 2 that outputs S ₄ , S ₅ , and S ₆ and a photographing mode selection signal of the operation panel 1
Based on the relationship between the gate circuit G ₀ that receives S ₁ and outputs a predetermined gate signal S ₃ and the output S ₃ of the gate circuit G ₀ and the outputs S ₄ and S ₅ of the latch circuit 2, In addition to outputting a control signal S ₇ , a control signal generator for controlling an irradiation control signal generation circuit 6 and a bed drive control signal generation circuit 7, which will be described later, based on the relationship between the two outputs S ₄ and S 5 of the latch circuit ₂ , etc. The control signal generation circuit 3 that generates the signal _S8 and the output of the gate circuit _G0
an X-ray exposure timing control circuit 5 that generates an X-ray exposure timing signal _S9 based on the relationship between S3 and a predetermined intermediate output of the control signal generation circuit ₃ ;
X which outputs an X-ray exposure signal S ₁₀ , an X-ray tube voltage setting signal S ₁₁ and an X-ray tube current setting signal S 12 based on the relationship between S ₉ and the other output S ₈ of the control signal generation circuit ₃ . Comparison of the radiation exposure control signal generation circuit 6, the output _S8 of the control signal generation circuit 3, and the output S13 of the position detection circuit ₈ that detects the current position of each mechanical part of the imaging bed (not shown) Control signal for bed drive based on
a bed drive control signal generation circuit 7 that generates _S14 ;
A bed mechanism section 1 including a bed drive control circuit 9 controlled by the control signal _S14 and a plurality of motors driven by a drive signal _S15 from the control circuit 9.
0, and a coincidence circuit 11 that generates a coincidence signal S 18 when the plurality of signal outputs S ₁₇ of the bed drive control signal generation circuit ₇ all match, and the output S ₁₈ of the coincidence circuit 11 is the control signal generation circuit 3;
The display circuit 4, the X-ray irradiation timing control circuit 5, and the latch circuit 2 are inputted to each control terminal, and the position detection circuit 8 is based on the momentum of each mechanism in the bed mechanism section 10. signal
It is now controlled by S ₁₆ . still,
A comparison output _S19 is derived from the exposure control signal generation circuit 6, and is applied to each control terminal of the control signal generation circuit 3 and the X-ray exposure timing control circuit 5. Here, among the push button switches SW ₀ to _{SW 17} , the upper switches SW ₁ to _{SW 9} are used to select the shooting mode in the order displayed there (for example, No. 1 is a prone mucosal image, No. 2 is a frontal standing ecstasy image, etc.) Switches SW ₁₀ to _{SW 12} located lower than the middle part are configured for selection of body thickness of the subject (for example, sequentially thick "F", normal "N", thin "L"
Configured as SW ₁₃ ~ _{SW 15}
is configured as a switch for selecting the height of the subject (for example, sequentially, high "T", normal "N", low "S"), and switch SW ₁₆ is configured as "arbitrary program selection switch". The switch SW ₁₇ shown by the broken line is configured as a "fully automatic program selection switch", and the last switch SW ₀ is configured as a "reset mode setting switch". It goes without saying that each of the outputs S ₁₀ to _{S 12} of the exposure control signal generation circuit 6 is applied to an X-ray control circuit (not shown). Further, the switches SW ₀ to _{SW 17} on the panel 1 are all momentary type switches, and are so-called self-illuminated switches in which the switches themselves light up when pressed by the latch circuit 2 and display circuit 4. .

FIG. 2 is a circuit diagram showing an example of a specific configuration of the device. In addition, in the same figure, the semi-automatic program (shooting mode selection switches SW ₁ to _{SW 9)}
Shooting positioning and X
Cases related to a fully automatic program (a configuration in which radiation exposure is performed automatically) and an arbitrary program (a configuration in which imaging is performed in accordance with the operator's arbitrary selection of the imaging mode) are shown. A configuration in which shooting in all shooting modes is automatically performed in order by simply pressing a button will be described later.

Each push button switch in operation panel 1 SW ₁ to _{SW 16}
One end of each contact of SW 0 and SW ₀ is grounded, and the other end of each contact is connected to the power supply (+
Vcc) voltage is applied to each of the inverters, and inverters IN ₁ to IN ₁₆ and IN ₀ are connected to the signal derivation path. The latch circuit 2 is composed of J-K type flip-flops _FF1 to _FF16 and _FF0 , each of which connects the outputs of the inverters _IN1 to _IN16 and _IN0 of the operation panel 1 to a clock terminal (CK). There is. Here, flip-flop FF ₁ ~
FF ₉ is for shooting mode selection signal latch, FF ₁₀ to FF ₁₅
FF 16 is used for the physique data selection signal latch, FF ₁₆ is used for the arbitrary program selection signal latch, and FF ₀ is used for the reset position setting signal latch. The gate circuit G ₀ is connected to the inverter IN ₁ of the operation panel 1
It is composed of a NOR gate circuit NR ₀ which uses the output of IN ₉ as a multi-input.

The control signal generation circuit 3 operates from flip-flops FF1 to _FF1 for latching the photographing mode selection signal of the latch circuit 2.
A first monomulti MM ₁ which commonly applies a reset output to the reset terminal of FF ₉ , and a first encoder ED ₁ which uses the outputs of the flip-flops FF ₁ to _{FF 9} as multiple inputs and generates a binary output.
and a first counter _CT1 which generates a binary output by inputting the output of a logic combinational circuit 3A, which will be described later.
and receives the binary output of the first counter _CT1 at one input terminal (IN-A), and receives the binary output of the first counter CT1 at one input terminal (IN-A).
A first switching circuit CG receives the binary output of the encoder ED ₁ at the other input terminal (IN-B), and switches and derives one of the binary outputs using a partial output of the logic combinational circuit 3A as a switching signal. ₁
and a decimal decoder DD which receives the binary output of the first switching circuit CG ₁ and selects and outputs a numerical value (0 to 9) corresponding to the value, and outputs "1" to "9" of the decimal decoder DD. is received at one input terminal (IN-A) and the flip-flop
The outputs of FF ₁ to _{FF 9} are received at the other input terminal (IN-B), and the arbitrary program selection signal of the latch circuit 2 is used as the output of flip-flop FF ₁₆ for latching as a switching signal to switch and output one of the binary outputs. a second switching circuit _CG2 , and flip-flops _FF10 to _FF15 for latching the output of the second switching circuit _CG2 and the physical data selection signal of the latch circuit 2;
The second encoder ED2 receives the output of the encoder _ED2 and generates a binary output, and a physique data reset circuit 3B. The logic combinational circuit 3A has three inputs: the output of the NOR gate circuit _NR0 , the output of the flip-flop _FF16 , and a signal obtained by inverting the "0" terminal output of the decimal decoder DD (inversion is performed by the inverter _IN20 ). The NOR gate circuit _NR1 and the flip-flop
A NOR gate circuit with two inputs: the output of FF ₁₆ and the comparison output of exposure control signal generation circuit 6, which will be described later.
NR ₃ , and a NOR gate circuit NR ₂ which has both outputs of these NOR gate circuits NR ₁ and NR ₃ as two inputs,
By a NAND gate circuit ND ₇ having two inputs: the inverted signal of the comparison output of the exposure control signal generation circuit 6 (inverted by the inverter IN ₁₇ ) and the "9" terminal output of the decimal decoder DD. The output of the NAND gate circuit NR ₂ is applied to the input terminal (IN) of the first counter CT ₁ , and the output of the NAND gate circuit ND ₁₇ is applied to the clear terminal (CLR) of the counter CT ₁ . There is. The physique data reset circuit 3B includes a NOR gate circuit _NR4 having two inputs, the output of the NAND gate circuit _ND17 of the logic combinational circuit 3A and the output of the flip-flop _FF16 , and the gate circuit.
It is composed of a NOR gate circuit _NR5 having two inputs: the output of _NR4 and the output of the flip-flop _FF0 for the reset position setting signal latch, and its output is connected to the flip-flops _FF10 to _FF15 for the physique data selection signal latch. It is designed to be commonly applied to the reset terminal.

Display circuit 4 consists of 17 NAND gate circuits ND ₀
~ _ND16 , and display lamps _L0 ~ _L16 connected to the output side of each NAND gate circuit via a resistor,
The first pulse generator _PG1 is composed of a first pulse generator PG1. Among the NAND gate circuits, the outputs of the "0" to "9" terminals of the decimal decoder DD are applied to each input terminal of one of the upper NAND gate circuits ND ₀ to ND ₉ , and the outputs of the "0" to "9" terminals of the decimal decoder DD are applied to each of the other input terminals. The output of the pulse generator PG ₁ of No. 1 is applied in common, and the output of the pulse generator PG 1 of No. 1 is applied in common to the other NAND gate circuits ND ₁₀ ~
The outputs of the flip-flops FF ₁₀ to _{FF 16} of the latch circuit 2 are commonly applied to each of the two input terminals of the ND ₁₆ , and the lamps L ₀ to _{L 16} are connected to a power supply (+Vcc). A voltage is commonly applied. Furthermore, this lamp L ₀ ~
L ₁₆ is, for example, the switch SW ₀ to _{SW 16} on the operation panel 1.
It is installed inside the lamp so that the operator can check its lighting status. Each lamp corresponds to each of the above-mentioned switches; lamp _L0 is for displaying reset position setting, lamps _L1 to _L9 are for displaying shooting mode selection, and lamps _L10 to _L15 are for displaying physique data setting. The lamp _L16 functions as an arbitrary program selection display.

The X-ray exposure timing control circuit 5 includes a J-K flip-flop FF ₁₇ to which the output of the NOR gate circuit NR ₀ is applied to a clock terminal (CK), an output of the flip-flop FF ₁₇ and the first monomulti MM _{1 .} a J-K flip-flop FF ₁₈ whose output is commonly applied to the clock terminal (CK);
The inverted signal of the output of the NOR gate circuit NR ₀ (inverted by the inverter IN ₁₈ ) and the
A NAND gate circuit ND ₁₉ which has two inputs as a signal obtained by inverting the output of FF ₁₆ (inverted by inverter IN ₁₉ ), and a NAND gate circuit which has two inputs as the output of the flip-flop FF ₁₈ and the output of the flip-flop FF ₁₆ . ND ₂₀ , a NAND gate circuit ND ₂₁ which has two inputs as the outputs of both NAND gate circuits ND ₁₉ and ND ₂₀ , and an inverter IN ₂₀ that inverts the output of the gate circuit ND ₂₁ and the "0" terminal output of the decimal decoder DD. and a NAND gate circuit ND ₂₂ which has three inputs as the output of the matching circuit 11 (described later), and the comparison output of the exposure control signal generating circuit 6 (described later) is applied to the reset terminal of the flip-flop FF ₁₈ . It is becoming more and more common.

The X-ray exposure control signal generation circuit 6 has X-ray exposure condition setting elements (X-ray exposure time, X-ray tube voltage, X-ray tube current) into which the binary outputs of the second encoder ED ₂ are respectively input. programmable memories PROM ₅ to PROM ₇ for storing the set amounts of , and a J-K flip-flop FF ₁₉ that receives the output of the X-ray exposure timing output circuit 5 at its clock terminal (CK);
A second pulse generator PG ₂ receives the output of the flip-flop FF ₁₉ at its control terminal (CONT).
and a second counter CT ₂ which receives the output of the pulse generator PG ₂ at its input terminal and generates a binary output.
Then, the binary output of the counter CT ₂ is received at one input terminal (IN-A), the binary output of the PROM ₅ is received at the other input terminal (IN-B), and both inputs are compared to find that they match. and a comparator COM ₅ that outputs a coincidence signal when the comparator
The coincidence output of COM ₅ is applied to the reset terminal of the flip-flop FF ₁₉ , the clear terminal of the second counter CT ₂ , the gate circuit NR ₃ of the logic combinational circuit 3A of the control signal generation circuit 3, and the inverter IN ₁₇ . ing. The output of the flip-flop FF ₁₉ becomes an X-ray exposure signal, and the binary outputs of PROM ₆ and PROM ₇ become an X-ray tube voltage setting signal and an X-ray tube current setting signal, respectively.

The position detection circuit 8 includes first to fourth potentiometers PM 1 to PM 4 that are linked to the movement of each position setting element of the bed mechanism (not shown), and first to fourth potentiometers PM ₁ to _{PM 4} that amplify the output of each of the potentiometers. 4 amplifiers
AMP ₁ to AMP _4. For example, among the respective potentiometers, the first potentiometer PM ₁ is for detecting the up/down position of the bed, and the second potentiometer is for detecting the up/down position of the bed.
The third potentiometer PM ₂ is for detecting the longitudinal movement position of the top of the bed.
PM ₃ is configured to detect the movement position of the top plate in the width direction, and the fourth potentiometer PM ₄ is configured to detect the rolling position of the top plate.

The bed drive control signal generation circuit 7 includes first to fourth A/D converters ADC that convert analog outputs of the first to fourth amplifiers AMP ₁ to AMP ₄ of the position detection circuit 8 into digital signals, respectively. ₁ ~ ADC ₄
and a second encoder of the control signal generation circuit 3.
4 programmable read-only memories PROM ₁ ~ for inputting the binary output of ED ₂ and storing the setting amount of each of the above-mentioned position setting elements of the bed;
Each binary output of the PROM ₄ and the A/D converters ADC ₁ to ADC ₄ is received at one input terminal (IN-A), and each binary output of the memory PROM ₁ to _{PROM 4} is received at the other input terminal (IN-A). -B), compare both input signal values (A, B), and if the condition is A>B, the "+" side output terminal is used, and if the condition is A<B, the "-" side output terminal is sent. , comparators COM ₁ to _{COM 4} each derive an output signal "1" from the "0" side output terminal under the condition of A=B. Each output of the comparators COM ₁ to COM ₄ is applied to a corresponding input terminal of the bed drive control circuit 9.

The matching circuit 11 outputs "0" from each of the comparators COM ₁ to _{COM 4} of the bed drive control signal generating circuit 7.
It is composed of a NAND gate circuit ND ₂₄ as an input, and an inverter IN ₂₄ that inverts the output of this gate circuit ND ₂₄ , and the output of the inverter IN ₂₄ is connected to the NAND gate circuit of the exposure timing generation circuit 5.
It is applied to the input of ND ₂₂ and the clear terminal (CLR) of the first pulse generator PG ₁ of the display circuit 4.
Further, the output of the NAND gate circuit _ND24 is applied to the reset terminal of the reset position setting signal latch flip-flop _FF0 .

The operation of the device will now be described with reference to the timing charts shown in FIGS. 3a and 3b. In the following operation description, semi-automatic program sequential operation photography (the timing chart of which is shown in FIG. 3a) and arbitrary program operation photography (the timing chart of which is shown in FIG. 3b) will be explained separately.

(1) Semi-automatic program sequential operation photography First, when the power is turned on, all logic circuits of the device are reset by a system clear signal, which will not be explained. Therefore, since the binary output of the first counter _CT1 in the display circuit 4 is "0", the binary output of the decimal decoder DD in the control signal generation circuit 3 is "0".
The output terminal becomes the output level "1", and the output level of the NAND gate _ND0 for lamp drive becomes "0" periodically by the pulse signal from the pulse generator _PG1 , and the display lamp _L0 for setting the reset mode is turned on and off. lights up (blinks). In this case, if the bed is already in the reset state (the subject can get on and off the bed), each position setting element of the bed (the up/down position of the bed, the longitudinal movement position of the top, the top (width direction movement position, top plate rolling position) are all at the reset setting position, and the coincidence circuit 11 derives a coincidence signal, so the first pulse generator PG ₁ does not oscillate, and the lamp L ₀ is continuous. The light turns on. Conversely, if any of the position setting elements of the bed are not at the reset position when the power is turned on, the binary output value "0" of the second encoder ED ₂ in the control signal generation circuit 3 is used to set each position of the bed. Memory for storing the position setting amount (programmable read-only memory) Each address 0 of PROM ₁ to _{PROM 4} (address where the reset position setting amount is stored)
and address these memories PROM ₁ ~
Based on the output signal of each position setting amount corresponding to the reset position from PROM ₄ , each position setting element starts driving toward each reset position.

That is, each position of each position setting element is detected by the potentiometers PM ₁ to _{PM 4} of the position detection circuit 8, and the detection signals are sent to the amplifiers AMP ₁ to
_Analog /digital (A/
D) It is converted into a digital signal by the converters ADC ₁ to ADC ₄ , and compared with the set amount of the reset position from each memory PROM ₁ to PROM ₄ in the comparators COM ₁ to _{COM 4} . Comparator COM ₁ ~ _{COM 4}
compares both input signal values (A, B), and A>
The output signal "1" is derived from the "+" output terminal in the case of B, the "-" output terminal in the case of A<B, and the "0" output terminal in the case of A=B. This comparator
The output signals of the respective output terminals COM ₁ to COM ₄ are introduced into the bed drive control circuit 9, and further into the bed mechanism section 10, and each drive motor (not shown) of each position setting element is connected to the corresponding "+", Starts forward or reverse rotation depending on the output level of the "-" output terminal.

Then, if each of the detected position amounts (A) and the set amount (B) match (A=B), an output signal is output from each "0" output terminal of each comparator COM ₁ to _{COM 4} . A "1" is derived, the respective drive motors are stopped, and each position setting element is set to its respective reset position. After that, when all the position setting elements are set to the reset position, an output signal is obtained from the coincidence circuit 11, and the oscillation of the first pulse generator _PG1 is stopped. At the same time, the coincidence signal is input to the NAND gate _ND0 of the X-ray exposure timing control circuit 5, so the lamp _L0 changes from a blinking light to a continuous light, indicating that the bed has entered the reset state. inform the person.

Next, switch SW _{10 to 100} depending on the body thickness of the subject.
Select and press one of SW ₁₂ , and select and press one of switches SW ₁₃ to _{SW 15} depending on the height of the subject. After completing the selection and setting of the subject's physique data, press the first shooting mode selection switch SW ₁ , and the Noah Gate NR ₀ ,
A count input signal is given to the first counter CT ₁ via NR ₁ and NR ₂ , and the binary output value of the counter CT ₁ is changed from "0" to "1". The output of this counter _CT1 is introduced to the decoder DD via the first switching circuit _CG1 , and the output of the decoder DD shifts from the "0" output terminal to the "1" output terminal.
Therefore, the gate of NAND gate ND ₀ is closed and the lamp L ₀ for displaying the reset mode setting is turned off, and at the same time, the gate of NAND gate ND ₁ is opened and the first image capturing is started by the pulse signal of the first pulse generator PG ₁ . Flash the mode display lamp _L1 . In this case, even if the switch SW ₁ is pressed, the output of the decoder DD is output from the "0" terminal, so the gate of the NAND gate ND ₂₂ of the X-ray exposure timing control circuit 5 is closed, so that the There is no radiation exposure start signal.

On the other hand, at the same time as switch SW ₁ is pressed, the second
The encoder ED ₂ outputs a binary value corresponding to the combination of two types of closed condition setting switches. This binary output is sent to the memory PROM ₁ for storing the set values for each position setting element of the bed.
~PROM ₄ and memory PROM ₅ ~ PROM ₇ for storing setting values of X-ray exposure condition setting elements (X-ray exposure time, X-ray tube voltage, X-ray tube current), and serves as an address signal for memories PROM ₁ ~ PROM The output value of ₇ is the setting amount (X
All radiation exposure condition setting elements are set to "0").
The value corresponds to the setting condition determined by the output of the second encoder ED ₂ . i.e. memory PROM ₁
The output value of ~PROM ₄ becomes the setting amount of each position setting element of the bed in the first imaging mode based on the physique of the subject, and the output value of the memory PROM ₅ ~ _{PROM 7}
The output value becomes the setting amount of the exposure time, tube voltage, and tube current based on the physique of the subject and the first imaging mode. Therefore, in the comparators COM ₁ to COM ₄ , the potentiometers PM ₁ to _{PM 4} and the amplifier
AMP ₁ ~ AMP ₄ and A/D converter ADC ₁ ~
Each position detection signal (A) corresponding to the reset position input via the ADC ₄ is compared with each set amount (B). This allows comparators COM ₁ to _{COM 4}
Until then (at the reset position) A=B, but since the setting amount (B) becomes the setting amount of the first shooting mode, there is a difference between the two and the coincidence signal ( 0 output terminal output signal)
is no longer output, a polarity signal of "+" or "-" is derived according to the relative difference state between the two, and the drive motor of each position setting element (not shown) in the bed mechanism section 10 is controlled via the bed drive control circuit 9. Rotate forward or reverse. In addition, the outputs of the memories PROM ₆ and PROM ₇ are sent to the X-ray exposure control circuit (not shown) as tube voltage,
Sent as the tube current setting value. more memory
The output of PROM ₅ becomes one input signal (set value of X-ray exposure time) of comparator COM ₅ (period t ₁ ~
t ₂ ).

Therefore, each position setting element of the bed is all set to the first position.
When the setting is completed to the position based on the shooting mode, a matching signal is derived from the matching circuit 11, and the lamp for displaying the first shooting mode is activated as described above.
_L1 changes from blinking to continuous lighting, informing the operator that the setting of the first photographing mode has been completed and that photographing is possible (during period _t2 to _t3 ).

Therefore, the first shooting mode selection switch
Press SW ₁ again, NOR gate NR ₀ , inverter IN ₁₈ , NAND gate ND ₁₉ , ND ₂₁ , ND ₂₂
An input signal is applied to the flip-flop FF ₁₉ in the exposure control signal generation circuit 6 through the exposure control signal generating circuit 6. In this case, even if switch SW ₁ is pressed, the decoder DD
Since the output "1" is not output from the "D" output terminal of , the count input signal is not input to the counter CT ₁ because the gate of the NOR gate NR ₁ is closed. This allows flip-flop
FF ₁₉ is set, gives an X-ray exposure signal to the X-ray exposure control circuit, and starts X-ray exposure. At the same time, the second pulse generator _PG2 starts oscillating and clock pulses are introduced into the second counter _CT2 . After that, the output of counter CT ₂ (A) A is the memory
When it matches the output value (B) of PROM ₅ (A=B),
A coincidence output signal is derived from the comparator COM ₅ , which resets the flip-flop FF ₁₉ to stop the X-ray exposure and at the same time clears the second counter CT ₂ (during the period t ₃ -t ₄ ). Its match output signal is
Further, a count input signal is applied to the first counter _CT1 via the NOR gates _NR3 and _NR2 , and the count value of the counter _CT1 is increased by one to "2". As a result, the output of decoder DD is "1"
to "2", the lamp L ₁ goes out, and the lamp L ₂ for displaying the second photographing mode flashes on and off. At the same time, the output of the second encoder ED ₂ becomes a predetermined binary value based on the combination of the second imaging mode signal and the physique of the subject, and each output value of the memories PROM ₁ to _{PROM 7} is used to set the setting conditions. Changes in quantity. Therefore, as described above, each position setting element and X-ray exposure condition setting element are respectively set for the second imaging mode,
Since the matching circuit 11 derives the matching signal again,
The second photographing mode display lamp _L2 changes from a blinking state to a continuous lighting state, informing the operator that the state is now ready for photographing (time _t5 ).

Next, switch SW ₂ for selecting the second shooting mode.
Press Noah Gate NR ₀ , Inverter IN ₁₈ ,
Flip-flop FF ₁₉ is set via NAND gates ND ₁₉ , ND ₂₁ and ND ₂₂ , and X-ray exposure is started. Thereafter, when the set exposure time has elapsed, the comparator COM ₅ derives a coincidence signal and the X-ray exposure ends. At the same time, the coincidence signal provides a count input signal to the first counter _CT1 via NOR gates _NR3 and _NR2 , and the counter
The output of CT ₁ goes up by one and becomes "3". As a result, the output of the decoder DD shifts from "2" to "3", the lamp L ₂ goes out, and the lamp L ₃ for displaying the third shooting mode starts blinking, and the third shooting mode is set. Driving is started (during period _t6 to _t7 ).

The above operations are repeated to sequentially take pictures in the first to ninth picture modes, and when the picture taking in the ninth picture mode ends with a match signal from the comparator COM ₅ , the match signal is sent to the inverter. IN ₁₇ , NAND gate ND ₁₇ , and counter CT ₁ and flip-flop FF ₁₀ via NOR gates NR ₄ and NR ₅ of physique data reset circuit 3B.
Clear signal (or reset signal) to ~FF ₁₅
give. As a result, the lit lamps among the lamps L ₁₀ to _{L 15} for displaying the setting conditions for body thickness and height go out, and at the same time, the output of the counter CT ₁ becomes "0", so the output of the decoder DD becomes "9". ”
to "0". Therefore, at the same time as lamp _L9 goes out, the reset mode display lamp
L ₀ flashes. At the same time, from the binary output value "0" of the second encoder ED ₂ , the memory PROM ₁ ~
PROM ₄ is addressed to address 0, and each position setting element of the bed is automatically returned to the reset position (state in which the subject can get on and off) (after time _t8 ).

(2) Shooting with arbitrary program operation First, press switch SW ₁₆ for arbitrary setting operation, set flip-flop FF ₁₆ , and set the first
Switching circuit CG ₁ changes from the state where the A input (output of counter CT ₁ ) is the output signal to the state where the B input (first
The second switching circuit CG ₂ is switched from the state where the A input (output of the decoder DD) is the output signal to the state where _the B input (flip-flop FF ₁ to _{FF 9} ) is the output signal. output) as an output signal, and then the NOR gates NR ₁ , NR ₃ , of the logic combinational circuit 3A
While closing the gates of NR ₄ and NAND gate ND ₁₉ , the gate of NAND gate ND ₂₀ of the exposure timing control circuit 5 is opened. At the same time, an indicator lamp L ₁₆ for arbitrary setting operation is turned on via a NAND gate ND ₁₆ for driving the lamp.

Next, if the bed is not in the reset state (when switching to arbitrary operation from the middle of program sequential operation), press the reset position setting switch SW ₀ .
Press to set the flip-flop FF ₀ , force the first and second encoders ED ₁ and ED ₂ to the "0" output value, and reset the bed in the same manner as described above. When the bed is in the reset state, a coincidence signal is derived from the coincidence circuit 11, which resets the flip-flop FF0 and releases the forced " ₀ " output state of the first and second encoders _ED1 and _ED2 . Even after this release, the bed remains in the reset state, so the first and second encoders ED ₁ and ED ₂ still have an output value of "0". Therefore, the output of the decoder DD is led to the "0" output terminal, and the reset mode indicating lamp _L0 is lit continuously.

In this state, the switches SW ₁₀ to _{SW 15} are selectively pressed according to the body thickness and height of the subject, and the corresponding flip-flops FF ₁₀ to FF ₁₂ are pressed.
Set any one of FF ₁₃ to FF ₁₅ .
(The corresponding one of the lamps _L10 to _L15 lights up.) Thereafter, the desired photographing mode is set by pressing any of the switches _SW1 to _SW9 . If you select the fifth shooting mode (No5) (press switch SW ₅ ), the flip-flop
FF ₅ is set, the output of the first encoder ED ₁ becomes a binary value of "5", and the first switching circuit
Decoder DD outputs “5” through CG ₁ ,
The fifth shooting mode display lamp _L5 starts blinking. At the same time, the second encoder ED ₂ is
Addressing memories PROM ₁ to PROM ₇ with binary values according to the combination of each selection switch of the species,
Each position setting element of the bed and each X-ray irradiation condition setting element are set to the corresponding setting amount (time
_t1 ).

After that, when the coincidence signal of the coincidence circuit 11 is derived, the lamp _L5 changes from blinking to continuous lighting.
The operator is notified that the state is now ready for X-ray exposure (time t ₂ ).

Thereafter, by pressing the switch _SW5 again, an input signal is applied to the flip-flop _FF17 in the exposure timing control circuit 5 via the NOR gate _NR0 . This allows flip-flop
Since FF ₁₇ was set when switch SW ₅ was pressed for the first time, it is set by the input signal again. Therefore, flip-flop FF ₁₇
The output changes from "1" to "0", and at the falling edge, the flip-flop FF ₁₈ in the next stage is set, and the flip-flop FF in the exposure control signal generation circuit 6 is set via the NAND gates ND ₂₀ , ND ₂₁ , and ND ₂₂ . Set ₁₉ . flipflop FF ₁₉
is set and X-ray exposure is started, the second pulse generator _PG2 oscillates and the second counter _CT2 counts clock pulses. When the count value of the counter CT ₂ reaches the set value from the memory PROM ₅ , a coincidence signal is derived from the comparator COM ₅ , the flip-flop FF ₁₉ is reset, and the X-ray exposure is stopped. Furthermore, flip-flop FF ₁₈ is also reset by the coincidence signal (period _t3 to _t4 ).

Next, for example, when you press switch SW ₉ to take a picture in the 9th shooting mode, Noah Gate NR ₀
Flip-flop FF ₁₇ is set via
At the rise of the set output, a pulse is instantaneously derived from mono multivibrator _MM1 , and a reset pulse is applied to all flip-flops _FF1 to _FF9 , and flip-flop _FF5 , which had been set up to that point, is reset. Furthermore, since the output pulse width of the mono-multivibrator _MM1 is extremely short compared to the time during which the switch _SW9 is closed, the flip-flop _FF9 is set with a delay of the pulse width time. Therefore, the output of the first encoder ED ₁ changes from "5" to "9", the lamp _L5 for displaying the fifth shooting mode goes out, and almost at the same time, the lamp _L9 for displaying the ninth shooting mode blinks. Turn on the light. Furthermore, the output of the second encoder ED ₂ is also a binary value corresponding to the combination of the ninth shooting mode selection switch SW ₉ and the physique data setting switches SW ₁₀ to SW ₁₅ , and is similar to that described above. Each position setting element of the bed and the X-ray exposure condition setting element are set respectively. As a result, the same operation as described above is performed, and after a coincidence signal is derived from the coincidence circuit 11 and the lamp _L9 changes to continuous lighting,
When the switch SW ₉ is pressed again, X-rays are emitted (period _t5 to _t8 ).

Therefore, in the case of arbitrary setting operations, after setting the subject's physique data, press the switch SW ₁ to _{SW 9} for the desired imaging mode once to issue a condition setting command for each imaging mode. By pressing the button again, X-ray photography will be performed under the specified conditions. Also, if you want to take pictures again under the same conditions while operating the program sequentially, you can use the optional setting switch.
This can be done by pressing SW ₁₆ , and then by pressing switch SW ₁₆ again to return to sequential operation, the sequential operation can be continued from the previous order. (At this time, the first counter
CT ₁ remembers the next step at the time of interruption. ) Next, a device for realizing fully automatic program sequential operation photography will be described. In order to realize this, a part of the circuit shown in FIG. 2 may be changed or added to a circuit as shown in FIG. 4. That is, a fully automatic program selection switch SW ₁₇ and an inverter IN ₂₅ connected to its output side are added to the operation panel 1,
A flip-flop FF ₂₁ that receives the output of the inverter IN ₂₅ at its clock (CK) terminal is added to the latch circuit 2, and a NAND gate circuit ND ₁₈ for driving a lamp and a lamp L ₁₇ driven by this are added to the display circuit 4. Add. and,
The X-ray exposure timing control circuit 5 includes an inverter IN ₂₃ for inverting the output of the additional flip-flop FF ₂₁ and an additional flip-flop.
Output of FF ₂₁ , output of existing inverter IN ₁₉ ,
A NAND gate circuit ND ₂₅ which has four inputs of the output of the inverter IN ₂₀ of the control signal generation circuit 3 and the coincidence signal from the coincidence circuit 11, and the NAND gate
A second mono multivibrator MM ₂ that uses the output of the ND ₂₅ as a trigger signal, and the mono multi MM _{2
A flip-flop FF 20 which} receives _the output of
Insert inverter IN ₂₄ instead and take out the output from this inverter IN ₂₄ . and,
The output signal of the coincidence circuit ₁₁ , the output signal of the inverter IN ₂₀ of the control signal generation circuit 3, and the output signal of the additional inverter IN 23 are applied to the existing NAND gate circuits ND 19 and ND ₂₀ , respectively, and the output signal of the additional inverter IN ₂₃ is applied to the NAND gate circuit ND ₂₁ . Additional flip-flop FF ₂₀
Apply the output of as an additional input signal.

Next, fully automatic program photography will be explained with reference to the timing chart shown in FIG.

In this fully automatic mode, operations related to reset mode setting from the time the power is turned on are the same as in the semi-automatic mode described above. Therefore, assuming that all position setting elements of the bed are at the reset position, the reset mode display lamp _L0 is lit continuously.

Then, by pressing the switch SW ₁₇ and setting the flip-flop FF ₂₁ , the fully automatic operation display lamp L ₁₇ is turned on via the NAND gate ND ₁₈ , and the inverter IN _{23 is} turned on.
Close the gates of NAND gate ND ₁₉ and ND _{20 through} , and open the gate of NAND gate ND ₂₅ at the same time.

Next, set the subject's physique data by selectively pressing switches SW ₁₀ to _{SW 12} and SW ₁₃ to _{SW 15} , and set the corresponding flip-flops FF ₁₀ to _{FF 15} to display the display lamps.
Light up the corresponding ones from L ₁₀ to L ₁₅ . If you then press switch SW ₁ for selecting the first shooting mode, the switch signal will be counted by counter CT ₁ as in the semi-automatic case described above, and the counted value will be changed from "0" to "1", thus resetting the camera. Setting of the first photographing mode starts from. At the same time, the display lamp _L0 goes out and the display lamp _L1 starts blinking (time _t1 ).

Thereafter, when all position setting elements of the bed complete position setting based on the first photographing mode, a coincidence signal is derived from the coincidence circuit 11, and the display lamp _L1 changes to continuous lighting (time _t2 ).

On the other hand, the coincidence signal triggers the mono multivibrator MM ₂ via the NAND gate ND ₂₅ of the X-ray exposure timing control circuit 5 at its falling edge. The monomultivibrator MM ₂ derives a pulse signal of relatively long width from the moment of input of its trigger signal. The pulse width of this signal has a width corresponding to the time required for the mechanical vibrations of each positioning element of the bed to subside. When the output pulse of this mono multivibrator MM ₂ subsequently falls from "1" to "0", the flip-flop FF ₂₀ is set at the falling timing, and the NAND gate ND ₂₁ and inverter IN ₂₄ are set.
The X-ray exposure timing control circuit 5 derives an output signal through the X-ray exposure timing control circuit 5 and provides a set input signal to the flip-flop FF ₁₉ . As a result, the flip-flop FF ₁₉ is set to derive an X-ray exposure signal, and the clock pulse generator PG ₂ is oscillated to cause the counter CT ₂ to start counting time counting pulses. After that, the count value of counter CT ₂ becomes
When the set value derived from the memory PROM ₅ for setting the radiation exposure time is reached, a coincidence signal is derived from the comparator COM ₅ , and the flip-flop FF ₁₉ is reset to stop the X-ray exposure (period t ₃ to t _Four ).
Further, the counter CT ₂ and flip-flop FF ₂₀ are reset by this coincidence signal, and at the same time,
Counter CT ₁ via NAND gate NR ₃ , NR ₂
A count input signal is applied to the counter _CT1 to count up the count value of the counter CT1 from "1" to "2". This sets the output of the decoder DD to "1"
to "2", and the lamp L ₁
disappears and the second shooting mode display lamp L ₂
starts blinking (after period t ₄ ). 2nd at the same time
Memory PROM ₁ through encoder ED ₂ ~
The PROM ₇ is addressed with a value based on the second shooting mode, and each setting element begins to be set to the second shooting mode condition. When all setting elements have been set, a coincidence signal is again derived from the coincidence circuit 11, and at the same time as described above, after a predetermined period of time, the X-ray exposure timing control circuit 5
The output signal is derived from the flip-flop
FF ₁₉ is set and X-ray exposure starts automatically (time t ₆ ). The above series of operations are the 1st to 9th operations.
The process is automatically repeated sequentially up to the shooting mode, and when the count value of the counter CT ₂ for counting the exposure time reaches the set value in the ninth shooting mode of the final stage, a coincidence signal is derived from the comparator COM ₅ . , since the NAND gate _ND17 is open, the counter _CT1 is reset and the output of the decoder DD changes from "9" to "0". Therefore, the lamp _L9 goes out and the reset mode display lamp _L0 lights up, and each position setting element of the bed returns to the reset position. At the same time, the coincidence signal resets the flip-flops _FF10 to _FF15 via the NOR gates _NR4 and _NR5 of the physique data reset circuit 3B,
Reset the lamps _L10 to _L15 for displaying physique condition settings.

In addition, when applying an automatic exposure control function such as a photo timer, the comparator
Instead of the coincidence signal of COM ₅ , an X-ray cutoff signal from an automatic X-ray exposure control device such as a photo timer may be used. Therefore, in this case, a memory PROM ₅ for setting exposure time, a clock pulse generator PG ₂ for time measurement, a counter CT ₂ and a comparator are used.
COM ₅ is no longer needed. In addition, a changeover switch (and a changeover indicator) is provided, and the comparator
A gate circuit may be provided to gate control the coincidence signal of COM ₅ and the output signal of the photo timer using a switching signal, so that both functions can be selectively applied.

Further, in the above embodiment, the digital hard logic circuit is used, but it may be an analog hard logic circuit or a logic circuit using a microcomputer.

It goes without saying that the present invention is not limited to the embodiments described above, and can be implemented with various modifications without changing the gist thereof.

As described above, according to the present invention, the operator can perform standardized group examinations, etc. by simply selecting the imaging position of the subject and the X-ray exposure conditions at this imaging position. This can be done without any hassle. Moreover, since it automatically detects when the bed has reached the imaging position and emits X-rays accordingly, there is no possibility of errors such as emitting X-rays before the bed reaches the imaging position. There is an effect.

[Brief explanation of drawings]

Fig. 1 is a system block diagram showing one embodiment of the schematic configuration of the device of the present invention, Fig. 2 is a circuit diagram showing a specific embodiment thereof, and Figs. 3a and b are timing charts for explaining its operation. , FIG. 4 is a partial circuit diagram for explaining a modified example of the device of the present invention, and FIG.
The figure is a timing chart for explaining its operation. 1...Operation panel, 2...Latch circuit, 3...
Control signal generation circuit, 4... Display circuit, 5... X-ray exposure timing control circuit, 6... X-ray exposure control signal generation circuit, 7... Bed drive control signal generation circuit,
8... Position detection circuit, 9... Bed drive control circuit,
10... Bed mechanism section, 11... Matching circuit, SW ₀ ~
SW ₁₇ ...Push button switch.

Claims (1)

[Claims] 1. An imaging mode selection unit that selects the imaging position of the subject and the X-ray exposure conditions at this imaging position, and a bed mechanism unit that moves the bed on which the subject is placed according to the selected imaging position. and a position detection unit that detects the position of the bed, and a comparison unit that compares the position detection signal from this position detection unit and the shooting position selected by the shooting mode selection unit, and generates a match signal when the two match. a matching section; and an X-ray irradiation section that responds to the matching signal supplied from the comparison matching section and irradiates X-rays toward the subject according to the irradiation conditions selected by the selection section. X characterized by having
Line diagnostic equipment.