JP4595662B2 - X-ray equipment - Google Patents

Description

  The present invention relates to an X-ray imaging apparatus for imaging a subject for diagnosis using X-rays.

  In general, in an X-ray imaging apparatus, a portion unnecessary for imaging is shielded from X-rays generated from an X-ray tube apparatus 27 held by an X-ray tube holding apparatus 26 suspended from a ceiling as shown in FIG. In order to reduce the exposure of the subject, a collimator 28 is attached to the front surface of the X-ray tube device 27. The normal rectangular X-ray irradiation field 30 formed by the collimator 28 is, for example, as shown in FIG. 7, the length of two sides thereof by a vertical dimension adjustment knob 32 and a horizontal dimension adjustment knob 33 provided on the panel surface of the collimator 28. Can be adjusted. However, performing this adjustment while irradiating a subject (not shown) on the examination table 31 with X-rays before X-ray imaging leads to an increase in the exposure of the subject. In order to prevent such exposure, the normal collimator 28 has a built-in irradiation field lamp 3 (FIG. 8) serving as a light source, and has a function of irradiating light instead of X-rays. The position and size of the irradiation field 30 can be adjusted before photographing by the light irradiation field 30 adjusted so as to match (see, for example, Patent Document 1). The light irradiation start or end is performed by the light irradiation button 15, and for example, the start and the end are repeated each time the light irradiation button 15 is pressed.

  An example of a circuit for controlling the start and end of light irradiation is shown in FIG. The flip-flop 59 is a digital having a function of inverting and storing the state of the output Q so far every time the potential of the c terminal changes from plus 5V (hereinafter referred to as H level) to 0V (hereinafter referred to as L level). IC. When the light irradiation button 15 is pressed, the c terminal of the flip-flop 59 lifted to the H level by the pull-up resistor 61 is set to the L level, so that, for example, the output Q that has been at the L level so far changes to the H level. As a result, the relay driver 60 operates, the coil 8a of the irradiation ON / OFF relay 8 is driven, the contact 8b operates to supply the output of the transformer 10 to the irradiation field lamp 3, and the irradiation field lamp 3 is lit. The transformer 10 converts the power supply voltage AC100V into, for example, AC20V, which is a voltage for lighting the irradiation field lamp 3 with an appropriate life, and the light irradiation button 15 is ideal for generating no chattering for the sake of simplification. It is a switch.

Further, as shown in FIG. 7, a dose detector 29 may be attached to the front surface of the collimator 28 in order to measure the X-ray irradiation amount at the time of imaging. The dose detector 29 is a light and transparent flat plate ion chamber and is connected to a dosimeter measuring device (not shown) by a cable (not shown) to constitute a dosimeter. Since the dose detector 29 is transparent, the position and dimensions of the irradiation field 30 are adjusted before photographing by the light irradiation field 30 even when the dose detector 29 is attached to transmit the light of the lamp built in the collimator 28. Can do. The collimator 28 includes a type in which the dose detector 29 is always attached and a type in which the dose detector 29 is detachable as necessary.
JP 2005-006971 A

  As described above, since the dose detector is a transparent flat plate ion chamber, the position and size of the irradiation field can be adjusted before photographing by the light irradiation field even when attached to the front surface of the collimator. As compared with the case where this is not attached due to the absorption of light, the illuminance of the irradiation field is lowered, and it becomes difficult to adjust the position and dimensions of the irradiation field. In order to solve this problem, the voltage applied to the lamp may be increased to increase the illumination intensity of the irradiation field. However, in this case, there is a disadvantage that the life of the lamp becomes extremely short. In view of these circumstances, an object of the present invention is to obtain an irradiation field with sufficient illuminance even when a dose detector is attached to the front surface of a collimator, and to prevent a reduction in lamp life.

  In order to achieve the above-mentioned object, the invention according to claim 1 has a detector of the X-ray dose measuring device attached to the front surface, has a light irradiation means, and the width and position of the X-ray irradiation field are determined by the light irradiation means. In an X-ray imaging apparatus constituted by an X-ray tube device having an X-ray collimator to be determined using a formed light irradiation field attached to the front surface, a high voltage generator, an X-ray tube holder, and an examination table, Provided is an X-ray imaging apparatus in which the illuminance switching means for switching the illuminance of the light irradiation field in two stages is provided in the X-ray collimator.

  In order to achieve the above-mentioned object, the invention according to claim 2 has a detector of the X-ray dose measuring device attached to the front surface, has a light irradiation means, and the width and position of the X-ray irradiation field are determined by the light irradiation means. In an X-ray imaging apparatus constituted by an X-ray tube device having an X-ray collimator to be determined using a formed light irradiation field attached to the front surface, a high voltage generator, an X-ray tube holder, and an examination table, Illuminance switching means for switching the illuminance of the light irradiation field in two stages, and first or second illuminance selection for selecting one of the illuminances switched by the illuminance switching means and instructing the start or end of light irradiation An X-ray imaging apparatus in which a light irradiation instruction unit is provided in the X-ray collimator is provided.

  In order to achieve the above object, the invention as set forth in claim 3 has a detection unit of an X-ray dosimeter that is detachably attached to the front surface, has light irradiation means, and determines the width and position of the X-ray irradiation field. X-ray imaging composed of an X-ray tube device having an X-ray collimator determined by using a light irradiation field formed by an irradiation means, a high voltage generator, an X-ray tube holder, and an examination table. In the apparatus, illuminance switching means for switching the illuminance of the light irradiation field in two stages, detection section confirmation means for confirming that the detection section is attached to the front surface of the X-ray collimator, and detection by the detection section confirmation section The X-ray collimator includes an illuminance selection unit that selects one of the two levels of illuminance switched by the illuminance switching unit depending on whether or not the part is confirmed, and a light irradiation instruction unit that instructs the start or end of light irradiation. Providing only X-ray imaging apparatus.

  In order to achieve the above object, the invention as set forth in claim 4 has a detection unit of the X-ray dose measuring device detachably attached to the front surface, has a light irradiation means, and determines the width and position of the X-ray irradiation field. X-ray imaging composed of an X-ray tube device having an X-ray collimator determined by using a light irradiation field formed by an irradiation means, a high voltage generator, an X-ray tube holder, and an examination table. In the apparatus, illuminance switching means for switching the illuminance of the light irradiation field in two stages, detection section confirmation means for confirming that the detection section is attached to the front surface of the X-ray collimator, and illuminance switched by the illuminance switching means First or second illuminance selection light irradiation instructing means for selecting one of them and instructing the start or end of light irradiation, and the first or second when the detection unit confirmation unit does not confirm the detection unit Two lights To provide an X-ray imaging apparatus of the inhibiting means for inhibiting provided in the X-ray collimator illuminance selection and light irradiation instruction by one of selected light irradiation instruction means.

  According to a fifth aspect of the present invention, in order to achieve the above object, the first or second illuminance selection light irradiation instructing means is one of two independent push buttons. An X-ray imaging apparatus is provided.

  In order to achieve the above-mentioned object, the first or second illuminance selection light irradiation instruction means presses one push button once or twice within a predetermined time. An X-ray imaging apparatus according to claim 2 or 4 is provided.

  In order to achieve the above object, the invention according to claim 7 is provided with irradiation time defining means for defining the irradiation time for at least one of the two levels of illuminance switched by the illuminance switching means. An X-ray imaging apparatus according to any one of claims 1 to 6 is provided.

  In order to achieve the above-mentioned object, the invention according to claim 8 has a detector of the X-ray dose measuring device attached to the front surface, has a light irradiation means, and the width and position of the X-ray irradiation field are determined by the light irradiation means. In an X-ray collimator that is determined using a formed light irradiation field, an X-ray collimator provided with illuminance switching means for switching the illuminance of the light irradiation field in two stages is provided.

  In order to achieve the above-mentioned object, the invention according to claim 9 has an X-ray dose measuring device attached to the front surface, has a light irradiation means, and the width and position of the X-ray irradiation field are determined by the light irradiation means. In the X-ray collimator determined using the formed light irradiation field, light is selected by selecting one of the illuminance switching means for switching the illuminance of the light irradiation field in two stages and the illuminance switched by the illuminance switching means. An X-ray collimator provided with first or second illuminance selection light irradiation instruction means for instructing the start or end of irradiation is provided.

  In order to achieve the above-mentioned object, the invention according to claim 10 has a detection unit of the X-ray dose measuring device detachably attached to the front surface, has a light irradiation means, and determines the width and position of the X-ray irradiation field. In the X-ray collimator that is determined using the light irradiation field formed by the irradiation means, the illuminance switching means for switching the illuminance of the light irradiation field in two stages, and the detection unit attached to the front surface of the X-ray collimator A detection unit confirmation unit to confirm, an illuminance selection unit to select one of two levels of illuminance switched by the illuminance switching unit depending on whether the detection unit is confirmed by the detection unit confirmation unit, and the start or end of light irradiation An X-ray collimator provided with a light irradiation instruction means for instructing is provided.

  In order to achieve the above object, an eleventh aspect of the present invention is characterized in that the detector of the X-ray dose measuring instrument is detachably attached to the front surface, has a light irradiation means, and determines the width and position of the X-ray irradiation field. In the X-ray collimator that is determined using the light irradiation field formed by the irradiation means, the illuminance switching means for switching the illuminance of the light irradiation field in two stages, and the detection unit attached to the front surface of the X-ray collimator A detection unit confirmation unit for confirming, a first or second illuminance selection light irradiation instruction unit for selecting one of the illuminances switched by the illuminance switching unit and instructing the start or end of light irradiation, and the detection An X-ray copier provided with prohibiting means for prohibiting illuminance selection and light irradiation instruction by either one of the first or second illuminance selection light irradiation instruction means when the part confirmation means does not confirm the detection unit To provide a meter.

  The invention described in claim 12 is characterized in that, in order to achieve the above object, the first or second illuminance selection light irradiation instructing means is one of two independent push buttons. Alternatively, an X-ray collimator according to claim 11 is provided.

  In order to achieve the above object, the first or second illuminance selection light irradiation instructing means presses one push button once or twice within a predetermined time. An X-ray collimator according to claim 9 or claim 11 is provided.

  In order to achieve the above object, the invention according to claim 14 is provided with irradiation time defining means for defining an irradiation time for at least one of the two levels of illuminance switched by the illuminance switching means. An X-ray collimator according to claims 8 to 13 is provided.

  According to the present invention, an irradiation field with sufficient illuminance can be obtained even when the dose detector is attached to the front surface of the collimator, and the shortening of the lamp life can be prevented.

  The invention according to the seventh aspect and the invention according to the fourteenth aspect are the inventions according to the first to sixth aspects and the eighth aspect to the thirteenth aspect, respectively, to which an irradiation time defining means is added. Since these are the best modes for carrying out, these will be described.

  An embodiment of the invention of the second aspect of the invention of the seventh aspect and an embodiment of the invention of the ninth aspect of the invention of the fourteenth aspect of the invention in the first embodiment, and of the invention of the seventh aspect of the invention An embodiment of the invention described in claim 10 of the invention described in claim 3 and claim 14 of the invention described in claim 14 is described in the second embodiment, and the invention described in claim 4 of the invention described in claim 7 and claim 14 of the invention described in claim 7. An embodiment of the invention described in claim 11 is shown in the third embodiment. Of the first and third embodiments, the first or second illuminance selection light irradiation instructing means according to claim 2, claim 9 or claim 4, or claim 11 is described in claim 5 or claim 12. The invention is used. An embodiment of the first or second illuminance selection light irradiation instructing means according to the sixth and thirteenth inventions is shown in the fourth embodiment.

  Example 1 will be described with reference to FIGS. 1 and 2A. This example is applied when the dose detector 29 is fixedly attached to the front surface of the collimator 28 attached to the X-ray tube device 27. 2 and 33 in FIG. 2A are a vertical dimension adjusting knob and a horizontal dimension adjusting knob, respectively, which are the same as those in FIG.

  In FIG. 1, an illuminance that can maintain an appropriate lifetime even when the irradiation field lamp 3 is lit for a long time, and a standard illuminance selection button 1 for instructing the start or end of irradiation, and an illuminance brighter than that are selected. The high illuminance selection button 2 for instructing the start or end of irradiation is such that each side of the flip-flops 11 and 12 is lifted to an H level by pull-up resistors 19 and 20, respectively. Connected to the terminal. As with the flip-flop 59 of FIG. 8 described in the background art section, each of the flip-flops 11 and 12 inverts and stores the state of the output Q so far every time the potential at the c terminal changes from H level to L level. And a digital IC having a reset function in which the output Q is forcibly changed to the L level when the R terminal becomes the L level. The output Q- is a terminal that always outputs logically opposite to the output Q.

  Outputs Q and Q- of the flip-flops 11 and 12 are connected to inputs T of monostable multivibrators 13, 14, 17, and 18, respectively. Each monostable multivibrator 13, 14, 17, 18 is connected to a predetermined terminal of each monostable multivibrator 13, 14, 17, 18 when the potential of the input T changes from L level to H level. An L level pulse having a time width determined by the values of a resistor and a capacitor (not shown) is output from the output Q−. Accordingly, when the standard illuminance selection button 1 is pressed when the output Q of the flip-flop 11 is at the L level, the output Q of the flip-flop 11 changes from the L level to the H level. Therefore, the output Q− of the monostable multivibrator 13 has a short time width. When the standard illuminance selection button 1 is pressed when the output Q- of the flip-flop 11 is at the L level and the output Q- of the flip-flop 11 changes from the L level to the H level, the monostable multivibrator An L level pulse with a short time width is output to 14 outputs Q−. When the output Q of the flip-flop 12 is at the L level, when the high illuminance selection button 2 is pressed, the output Q of the flip-flop 12 changes from the L level to the H level, so that the output Q− of the monostable multivibrator 17 has a short time width. When the high-illuminance selection button 2 is pressed when the output Q− of the flip-flop 12 is at the L level, the output Q− of the flip-flop 12 changes from the L level to the H level. An L level pulse with a short time width is output to the output Q− of the vibrator 18. These outputs are connected to the start or stop input of timer 4 or timer 5, respectively. The output Q− of the monostable multivibrator 13 passes through the inverter 44 and the OR gate 42 to the R terminal of the flip-flop 12, and the output Q− of the monostable multivibrator 17 passes through the inverter 43 and the OR gate 40 to the R of the flip-flop 11. It is also connected to the terminal.

  Timers 4 and 5 output H level pulses with time widths of 30 seconds and 15 seconds, respectively, when the potential of their respective start inputs changes from H level to L level, but stop input during the output of H level pulses. When the potential of H changes from H level to L level, the timer operation is stopped at that time, and the output is set to L level. When the timer 4 ends or interrupts the timer operation and its output changes from the H level to the L level, the monostable multivibrator 38 operates to generate an H level pulse at the output Q. The flip-flop 11 is reset via. Similarly, when the timer 5 ends or interrupts the timer operation, the monostable multivibrator 39 operates and the flip-flop 12 is reset.

  When the standard illuminance selection button 1 is pressed in this circuit, an L level pulse is generated at the output Q− of the monostable multivibrator 13 to start the timer 4 as described above, and the flip-flop is passed through the inverter 44 and the OR gate 42. 12 is reset. As a result, when the timer 5 is activated, the operation is stopped by the L level pulse generated at the output Q− of the monostable multivibrator 18. The relay driver 6 is operated by an H level pulse with a time width of 30 seconds output from the timer 4, the coil 8a of the irradiation ON / OFF relay 8 is driven, and the c terminal of the contact 8b is connected to the a terminal. The a terminal of the contact 8b is connected to the c terminal of the contact 9b of the illuminance switching relay 9 having the coil 9a driven by the relay driver 7 that operates when the timer 5 is started. The terminals are respectively connected to a terminal that converts the input voltage AC100V of the transformer 10 to AC20V that is a voltage at which the irradiation field lamp 3 is lit with an appropriate life, and a terminal that converts and outputs to AC30V that gives a brighter illuminance. ing. When the standard illuminance selection button 1 is pushed by this circuit and the timer 4 is started, the irradiation ON / OFF relay 8 is driven and the illuminance switching relay 9 is not driven, so that AC 20 V is supplied to the irradiation field lamp 3 for 30 seconds, Meanwhile, the field is illuminated with standard illuminance.

  On the other hand, when the high illuminance selection button 2 is pressed, the timer 5 is started by the same operation as described above, and the relay drivers 6 and 7 are operated by the output to both the irradiation ON / OFF relay 8 and the illuminance switching relay 9. Is driven. As a result, AC 30 V is supplied to the irradiation field lamp 3 for 15 seconds, and the irradiation field is illuminated with a brighter illuminance during that time.

  When the standard illuminance selection button 1 is pressed again during the operation of the timer 4, the monostable multivibrator 14 operates to stop the operation of the timer 4. Similarly, when the high illuminance selection button 2 is pressed again during the operation of the timer 5, the monostable multivibrator 18 operates to stop the operation of the timer 5.

  When the operator adjusts the size and position of the irradiation field by the circuit as described above, for example, the standard illuminance selection button 1 can be pressed and adjusted roughly, and then the high illuminance selection button 2 can be pressed and adjusted precisely. In addition, since the time of one irradiation is limited by the timer 4 or 5, even when the high illumination selection button 2 is pressed to illuminate more brightly, the life of the irradiation field lamp 3 can be prevented from being shortened.

  Example 2 will be described with reference to FIGS. 4, 2B and 3. FIG. This example is applied when the dose detector 29 is detachably attached to the front surface of the collimator 28 attached to the X-ray tube device 27. Note that reference numeral 32 in FIG. 2B is a vertical dimension adjustment knob, and reference numeral 33 in FIG. 2B and FIG. 3A is a horizontal dimension adjustment knob, both of which are the same as those in FIG.

  In order to detachably attach the dose detector 29 to the front surface of the collimator 28, for example, as shown in FIG. 3, a detector mounting frame 35 is fixed to the front surface of the collimator 28 with screws or the like, and the dose is fixed to the detector mounting frame 35. There is a method of inserting the detector 29. FIG. 3A is a schematic view of an example of this method viewed from the side of the X-ray tube device 27, and FIG. 3B is a schematic bottom view of FIG. 3A. In this case, detector confirmation such as a micro switch that operates when the dose detector 29 is inserted to a predetermined position so that it can be electrically confirmed whether or not the dose detector 29 is attached to the front surface of the collimator 28. The switch 16 is disposed inside the detector mounting frame 35.

  Next, the illuminance switching operation of the irradiation field lamp 3 will be described with reference to FIG. However, the flip-flop 21 is the same as the flip-flop 59 of FIG. 8 except that an R terminal and a Q-terminal are added, and the monostable multivibrators 22 and 23 are the same as the monostable multivibrators 13 and 14 of FIG. The circuits subsequent to the timers 4 and 5 are the same as those in FIG. 1 except for the monostable multivibrators 45 and 46 and the OR gate 34, and thus the description of the overlapping items is omitted.

  In FIG. 4, the light irradiation button 15 is connected to the c terminal of the flip-flop 21 whose one side of the contact is at the L level and the other is lifted to the H level by the pull-up resistor 36. , Outputs Q and Q- respectively invert the previous state. Since these outputs are respectively connected to the inputs T of the monostable multivibrators 22 and 23, when the light irradiation button 15 is pressed and the output Q of the flip-flop 21 changes from L level to H level, the monostable multivibrator An H level pulse is output from the output Q of 22. At this time, if the dose detector 29 is not inserted into the detector mounting frame 35 shown in FIG. 3 and the detector confirmation switch 16 is not turned on, the H level pulse output from the monostable multivibrator 22 is input. One starts the timer 4 through the AND gate 24 held at the H level by the pull-up resistor 37, but the dose detector 29 is inserted into the detector mounting frame 35 and the detector confirmation switch 16 is turned ON. If so, since the input of the inverter 48 becomes L level and one of the inputs of the AND gate 25 becomes H level, the H level pulse output from the monostable multivibrator 22 starts the timer 5 through the AND gate 25. To do. As a result, by the same operation as described with reference to FIG. 1, when timer 4 is started, AC 20 V is supplied to irradiation field lamp 3 for 30 seconds, and when timer 5 is started, AC 30 V is supplied to irradiation field lamp 3 for 15 seconds. Is done. When the light irradiation button 15 is pressed during the operation of the timer 4 or 5, an L level pulse is output from the output Q- of the monostable multivibrator 23 and input to the stop terminals of the timers 4 and 5, and the timer 4 or 5 operates. To stop. When the timer 4 ends or interrupts the timer operation and its output changes from the H level to the L level, the monostable multivibrator 45 operates, and the H level pulse generated at the output Q passes through the OR gate 34. The flip-flop 21 is reset. Similarly, when the timer 5 ends or interrupts the timer operation, the flip-flop 21 is reset.

  In this example, when the operator presses the light irradiation button 15 without attaching the dose detector 29, the irradiation field lamp 3 is lit for 30 seconds at a standard illuminance, and when the dose detector 29 is attached and the light irradiation button 15 is pressed. The irradiation field lamp 3 is lit for 15 seconds with brighter illuminance. Therefore, even when the dose detector 29 is attached, the irradiation field is illuminated with sufficient illuminance.

  Example 3 will be described with reference to FIGS. 5, 2A, and 3. FIG. This example is applied when the dose detector 29 is detachably attached to the front surface of the collimator 28 attached to the X-ray tube device 27. Note that reference numeral 32 in FIG. 2A is a vertical dimension adjustment knob, and reference numeral 33 in FIGS. 2A and 3A is a horizontal dimension adjustment knob, both of which are the same as those in FIG.

  Next, the illuminance switching operation of the irradiation field lamp 3 will be described with reference to FIG. 5. However, the circuits other than the detector confirmation switch 16, the pull-up resistor 47, and the AND gate 41 are the same as those in FIG. To do.

  When the standard illuminance selection button 1 is pressed in this circuit, AC 20 V is supplied to the irradiation field lamp 3 for 30 seconds by the same operation as described in FIG. 1, while the irradiation field is illuminated with the standard illuminance.

In contrast, the signal from the high illuminance selection button 2 passes through the AND gate 41 only when the dose detector 29 of FIG. 3 is inserted into the detector mounting frame 35 and the detector confirmation switch 16 is ON. And input to the c terminal of the flip-flop 12. When the signal from the high illuminance selection button 2 is input to the c terminal of the flip-flop 12, the timer 5 is started by the same operation as when the high illuminance selection button 2 is pressed in FIG. In operation, both the irradiation ON / OFF relay 8 and the illuminance switching relay 9 are driven. As a result, AC 30 V is supplied to the irradiation field lamp 3 for 15 seconds, and the irradiation field is illuminated with a brighter illuminance during that time.

  When the standard illuminance selection button 1 is pressed again during the operation of the timer 4, the monostable multivibrator 14 operates to stop the operation of the timer 4. Similarly, when the high illuminance selection button 2 is pressed again during the operation of the timer 5, the monostable multivibrator 18 operates to stop the operation of the timer 5. These are also the same as the operation of FIG.

  When the dose detector 29 is inserted into the detector mounting frame 35 and the detector confirmation switch 16 is turned on by the circuit as described above, the operator first adjusts the size and position of the irradiation field with the standard illuminance. The selection button 1 can be pushed to make a rough adjustment, and then the high illumination selection button 2 can be pushed to illuminate more brightly to make a precise adjustment. However, if the dose detector 29 is not inserted into the detector mounting frame 35, it is standard. Only the illuminance can be selected by the illuminance selection button 1.

  An embodiment of the first or second illuminance selection light irradiation instruction means of the invention of claim 5 will be described with reference to FIG. FIG. 6A shows that when the light irradiation button 15 is pressed twice within a predetermined time, in this example, 1 second, the signal line of the high illuminance selection signal − becomes L level, but once within 1 second. FIG. 6A shows an example of a circuit in which the signal line of the standard illuminance selection signal − becomes L level when only pressed, and instead of the standard illuminance selection button 1 and the pull-up resistor 19 in FIG. 1 or FIG. The signal line of the selection signal − is connected, and the signal line of the high illumination selection signal − of FIG. 6A is connected instead of the high illumination selection button 2 and the pull-up resistor 20 of FIG. 1 or FIG. 1 and the same operation as FIG.

  FIG. 6B is a timing chart for explaining the operation of FIG. 6A, and shows the operation of each point indicated by symbols A to H in FIG. 6A. Further, in the case of any of the monostable multivibrators 49, 54, and 56 used in FIG. 6A, if there is an input again during the output of the pulse by the input to the trigger terminal, the input is ignored.

When the light irradiation button 15 is pressed, the input T of the monostable multivibrator 49 suspended at the H level by the pull-up resistor 36 and the c terminal (point A) of the flip-flop 50 are set to the L level. The output Q of the flip-flop 50 that has been reset together with the flip-flop 51 is set to the H level by a series of operations starting from the operation of the initial reset circuit (not shown) or the previous light irradiation button 15. As a result, the c terminal of the flip-flop 51 also becomes H level. At this time, the output Q− of the flip-flop 51 remains at H level, so the output (point D) of the AND gate 52, that is, the standard illuminance selection signal − is L level. become. At the same time, from the output Q (point B) of the monostable multivibrator 49, a time width determined by the value of a resistor and a capacitor (not shown) connected to a predetermined terminal of the monostable multivibrator 49, here, an H level of 1 second Since the pulse is output and the monostable multivibrator 56 is triggered at the leading edge, the flip-flop 57 is set by the previous operation, and the output Q- (H point), that is, the high illumination selection signal- becomes L level. If so, reset it.

  One second after the light irradiation button 15 is pressed, the monostable multivibrator 54 is triggered at the trailing edge of the output pulse of the monostable multivibrator 49, and the flip-flops 50 and 51 are reset by the output pulse. The right half of FIG. 6B shows the operation at points A to H at this time. Thereafter, when the light irradiation button 15 is pressed again, the circuit of FIG. 6A repeats the above operation shown in the right half of FIG. 6B.

  When the light irradiation button 15 is pressed, the circuit of FIG. 6A performs the above operation. When the light irradiation button 15 is pressed and pressed again within one second, the flip-flop 50 inverts the state of the output Q. As a result, the flip-flop 51 is set and the output Q becomes H level. At this time, since the output Q− of the flip-flop 50 is also at the H level, the output (point E) of the AND gate 53 is at the H level, and the output pulse of the monostable multivibrator 49 is still at the H level. The output (point F) of the gate 55 also becomes H level. As a result, the flip-flop 57 is set, and its output Q- (H point), that is, the high illuminance selection signal- becomes L level. When 1 second has elapsed since the light irradiation button 15 was pressed for the first time, the monostable multivibrator 54 is triggered by the trailing edge of the output pulse of the monostable multivibrator 49, and the flip-flops 50 and 51 are reset by the output pulse. The left half of FIG. 6B shows the operation at points A to H at this time.

  The present invention relates to an X-ray imaging apparatus for imaging a subject for diagnosis using X-rays.

It is a typical circuit diagram for demonstrating Example 1 of this invention. It is a figure of the panel surface of the collimator for demonstrating a prior art and this invention. It is a figure which shows an example of the method of attaching a dose detector to a collimator front surface so that attachment or detachment is possible. It is a typical circuit diagram for demonstrating Example 2 of this invention. It is a typical circuit diagram for demonstrating Example 3 of this invention. It is a typical circuit diagram for demonstrating Example 4 of this invention. It is a figure for demonstrating a prior art. It is a typical circuit diagram for demonstrating a prior art.

Explanation of symbols

1: Standard illuminance selection button 2: High illuminance selection button 3: Irradiation field lamp 4, 5: Timer 6, 7, 60: Relay driver 8: Irradiation ON / OFF relay 8a, 9a: Coil 8b, 9b: Contact 9: Illuminance Switching relay 10: Transformer 11, 12, 21, 50, 51, 57, 59: Flip-flop 13, 14, 17, 18, 22, 23, 38, 39, 45, 46, 49, 54, 56: Monostable multi Vibrator 15: Light irradiation button 16: Detector confirmation switch 19, 20, 36, 37, 47, 61: Pull-up resistor 24, 25, 41, 52, 53, 55: AND gate 26: X-ray tube holding device 27: X-ray tube device 28: Collimator 29: Dose detector 30: Irradiation field 31: Examination table 32: Vertical dimension adjustment knob 33: Horizontal dimension adjustment knob 35: Detector mounting frames 34, 40, 42: O Gate 43,44,48: Inverter

Claims (11)

An X-ray collimator is attached to the front face of the X-ray dosimeter, which has a light irradiation means and determines the width and position of the X-ray irradiation field using the light irradiation field formed by the light irradiation means. In an X-ray imaging apparatus constituted by an X-ray tube device, a high voltage generator, an X-ray tube holder, and an examination table, an illuminance switching means for switching the illuminance of the light irradiation field in two stages, The X-ray collimator is provided with first or second illuminance selection light irradiation instruction means for selecting one of the illuminances switched by the illuminance switching means and instructing the start or end of light irradiation . An X-ray imaging apparatus characterized in that the second illuminance selection light irradiation instructing means presses one push button once or twice within a predetermined time . X-ray which attaches the detection part of X-rays measuring instrument to the front surface so that attachment or detachment is possible, has a light irradiation means, and determines the width and position of an X-ray irradiation field using the light irradiation field formed by the said light irradiation means Illuminance switching that switches the illuminance of the light irradiation field in two stages in an X-ray imaging apparatus comprising an X-ray tube device with a collimator attached to the front, a high voltage generator, an X-ray tube holder, and an examination table Means for confirming that the detector is attached to the front surface of the X-ray collimator, and two steps switched by the illuminance switching means depending on whether the detector is confirmed by the detector confirmation means An X-ray imaging apparatus comprising: an illuminance selection unit that selects one of illuminances; and a light irradiation instruction unit that instructs the start or end of light irradiation. X-ray which attaches the detection part of X-rays measuring instrument to the front surface so that attachment or detachment is possible, has a light irradiation means, and determines the width and position of an X-ray irradiation field using the light irradiation field formed by the said light irradiation means Illuminance switching that switches the illuminance of the light irradiation field in two stages in an X-ray imaging apparatus comprising an X-ray tube device with a collimator attached to the front, a high voltage generator, an X-ray tube holder, and an examination table Means, a detection unit confirmation unit for confirming that the detection unit is attached to the front surface of the X-ray collimator, and selecting one of the illuminances switched by the illuminance switching unit to start or end light irradiation. Illuminance selection by one of the first or second illuminance selection light irradiation instruction means for instructing and the first or second illuminance selection light irradiation instruction means when the detection section confirmation means does not confirm the detection section X-ray imaging apparatus of the prohibiting means for prohibiting and light irradiation instruction, characterized in that provided on the X-ray collimator. 4. The X-ray imaging apparatus according to claim 3, wherein the first or second illuminance selection light irradiation instruction means is one of two independent push buttons. The first or second X-ray imaging apparatus according to claim 3, wherein the illuminance selected light irradiation instruction means is that the pressing once or twice in one pushbutton a predetermined time. 6. The X-ray imaging apparatus according to claim 1, further comprising irradiation time defining means for defining an irradiation time for at least one of the two levels of illuminance switched by the illuminance switching means. X-ray which attaches the detection part of X-rays measuring instrument to the front surface so that attachment or detachment is possible, has a light irradiation means, and determines the width and position of an X-ray irradiation field using the light irradiation field formed by the said light irradiation means In the collimator, an illuminance switching means for switching the illuminance of the light irradiation field in two stages, a detection section confirmation section for confirming that the detection section is attached to the front surface of the X-ray collimator, and the detection by the detection section confirmation section An illuminance selection means for selecting one of the two levels of illuminance switched by the illuminance switching means depending on whether or not the part is confirmed, and a light irradiation instruction means for instructing the start or end of light irradiation are provided. Line collimator. X-ray which attaches the detection part of X-rays measuring instrument to the front surface so that attachment or detachment is possible, has a light irradiation means, and determines the width and position of an X-ray irradiation field using the light irradiation field formed by the said light irradiation means In a collimator, illuminance switching means for switching the illuminance of the light irradiation field in two steps, detection section confirmation means for confirming that the detection section is attached to the front surface of the X-ray collimator, and illuminance switched by the illuminance switching means First or second illuminance selection light irradiation instructing means for selecting one of them and instructing the start or end of light irradiation, and the first or second when the detection unit confirmation unit does not confirm the detection unit An X-ray collimator, comprising: prohibiting means for prohibiting illuminance selection and light irradiation instruction by any one of the two illuminance selection light irradiation instruction means. The X-ray collimator according to claim 8, wherein the first or second illuminance selection light irradiation instruction means is one of two independent push buttons. 9. The X-ray collimator according to claim 8, wherein the first or second illuminance selection light irradiation instruction means presses one push button once or twice within a predetermined time. 11. The X-ray collimator according to claim 7, further comprising irradiation time defining means for defining an irradiation time for at least one of the two levels of illuminance switched by the illuminance switching means.

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