JPH06237926A - X-ray diagnostic device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an X-ray diagnostic apparatus capable of surely detecting a change of a subject and performing reset including zero reset of continuous exposure time. . According to the present invention, in an X-ray diagnostic apparatus that includes a tilting type imaging table 1 that can be tilted from a standing position to a tilted position, and the exposure time is timer-controlled, the tilting imaging table 1 is in a standing posture. And a pressure sensor 8 for detecting the pressure received from the subject when it is mounted on the upright imaging table 1.
And means for performing reset including zero reset of the exposure time when the detection signal is output from the detection circuit 9 and the upright position detection device 3 and the pressure detected by the pressure sensor 8 and the detection circuit 9 is less than or equal to a predetermined value. Is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus equipped with a tilting type imaging table which can be tilted between a standing position and a tilted position and which controls the exposure time with a timer.

[0002]

2. Description of the Related Art Conventionally, an X-ray diagnostic apparatus of this type is constructed as shown in FIG. That is, 30 is an over-table type imaging table, and the imaging table 30 is supported by a tilting device 31 and goes from an upright position (+ 90 °) to a horizontal position (0 °) to an upright position (−90 °). ) Can be erected within the range. A footrest 32 is attached to one end of the top surface of the imaging table 30 so that the subject C does not fall from the table when the imaging table 30 is raised from a horizontal position.

An X-ray tube 33 is provided on the support 3 above the imaging table 30.
An image intensifier and a spot shot device (not shown) are supported inside the imaging table 30 so as to face the X-ray tube 33. Further, a name printer 35 for imprinting a patient name and a film number on the film is housed in the photographing table 30. The film number refers to a serial number given to each film in the order of photographing when the same patient is photographed repeatedly.

The X-ray controller 36 includes a high voltage generator 37 for supplying a high voltage to the X-ray tube 33, and an integration timer circuit 38.
With. The integration timer circuit 38 has an operation panel 39.
In response to a fluoroscopy start command from the X-ray exposure start signal, the X-ray exposure start signal is output to the high voltage generator 37, and the fluoroscopy limit time (JI
An X-ray cutoff signal is output to the high voltage generator 38 when a maximum of 10 minutes in the S standard has elapsed. The high voltage generator 38 is
When this cutoff signal is received, the supply of the high voltage to the X-ray tube 33 is stopped, and the X-ray exposure is stopped.

When a plurality of patients are repeatedly imaged by such an apparatus, it is necessary to operate the operation panel 39 to reset each time the imaging of one patient is completed and the next patient is replaced. By this reset operation, the zero reset signal of the film number and the next patient's name information are sent from the operation panel 39 to the name printer 35, and the zero reset signal of the integration time is sent from the operation panel 39 to the integration timer circuit 38.

As described above, this reset operation needs to be repeated every time the patient is changed, so that the operator is extremely burdened. If this reset operation is not performed, the film of the current patient will be printed with the previous patient's name and the consecutive film number from the film number given to the last film of the previous patient, which is important for later image interpretation work. Cause problems. Further, since the cumulative time of the cumulative timer circuit 38 is not reset to zero, the cumulative timer circuit 38 calculates the fluoroscopic time of the current patient from the cumulative time accumulated during fluoroscopy of the previous patient, and as a result, the cumulative time of the current patient is However, the limit time may be reached in a short time, and the fluoroscopy of the current patient may end in an unplanned short time.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to address the above-mentioned circumstances, and an object thereof is to reliably detect replacement of a subject and perform reset including zero reset of exposure time. It is to provide an X-ray diagnostic apparatus capable of performing the above.

[0008]

SUMMARY OF THE INVENTION The present invention provides an X-ray diagnostic apparatus which includes a tilting type imaging table which can be tilted between a standing position and a tilted position, and which controls the exposure time by a timer. Detecting means for detecting the posture of the subject, and second detecting means for detecting the pressure received from the subject when placed on the tilting imaging table.

The first means detects the standing position, and when the pressure detected by the second means is below a predetermined value, the exposure time is reset including zero reset. And

[0010]

According to the present invention, when the tilting and photographing table is in the standing posture and the pressure detected by the second means is less than the predetermined value,
The reset operation can be performed by judging that the subject has been replaced, and the burden on the operator, which has conventionally been repeatedly performing the reset operation every time the subject is replaced, can be eliminated, and the subject can be imaged upside down. It is possible to reliably detect that the user has stepped off the platform and prevent an unnecessary reset operation during the fluoroscopic imaging period. Further, since it is determined whether or not the pressure detected by the second means is equal to or less than the predetermined value, it is possible to avoid the problem that the reset operation is repeated while getting on and off the subject.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the X-ray diagnostic apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of this embodiment. The photographing table 1 is supported by the tilting device 2 and stands (+ 90 °).
It is possible to tilt up and down from the horizontal position (0 °) to the upright position (-90 °). The tilting device 2 includes
An upright position detection device 3 is provided which has a rotary encoder for detecting the attitude (angle) of the imaging table 1 and outputs an ON signal when the attitude of the imaging table 1 is upright.

If the imaging table 1 is an overtable type, although not shown, it houses a video system including an image intensifier and a spot shot device, and the X-ray tube 4 is armed to face them. It is placed above the top plate at 5. Further, as shown in FIG. 2A with diagonal lines and in FIG.
A name printer 6 for imprinting the subject name A and the film number B is stored in. The film number refers to a serial number given to each film in the order of photographing when the same subject C is photographed repeatedly.

Further, at one end of the top surface of the photographing table 1,
A footrest (step) 7 for preventing the subject C from falling is equipped. A pressure sensor 8 that detects the pressure applied to the footrest 7 by the weight of the subject C is arranged in the footrest 7. The pressure sensor 8 has a property that the resistance value of the internal resistance changes according to the external pressure, and this change is detected by the detection circuit 9.

The detection voltage V from the detection circuit 9 is supplied to the comparator 1.
Supplied to zero. The comparator 10 detects the detection voltage V from the detection circuit 9 and the reference voltage Vref from the reference voltage generator 11.
And the ON signal is output only when the reference voltage Vref is high. The reference voltage Vref can be arbitrarily adjusted by the reference voltage generator 11. AN
The D circuit 12 receives the outputs of the comparator 10 and the above-mentioned standing position detecting device 3, and outputs a reset signal R when both of them are ON signals. This reset signal R is OR
It is supplied to the circuit 13 and the operation panel 14. OR circuit 13
The reset signal R input from the operation panel 14 is also input to. The OR circuit 13 outputs a reset signal when the reset signal R is input from either the AND circuit 12 or the operation panel 14.

The X-ray controller 15 comprises a high voltage generator 16 for supplying a high voltage to the X-ray tube, and an integration timer circuit 17. The integration timer circuit 17 outputs an X-ray cutoff signal OB to the high voltage generator 16 when a predetermined fluoroscopic time has elapsed from the start of X-ray exposure. The fluoroscopic time is 10 minutes at maximum in the JIS standard, and is set arbitrarily from the operation panel 14 within this range and transmitted to the integration timer circuit 17. The integration timer circuit 17, when receiving the reset signal R from the OR circuit 13 described above, resets the integration time currently stored in memory to zero.

The operation panel 14 has a transparent condition, a photographing condition,
It is an input device for inputting various commands and information necessary for fluoroscopic imaging such as commands for starting / terminating fluoroscopy and starting imaging, setting the name of the subject and fluoroscopic time T. Further, the operation panel 14 is
When the reset signal R is received from the AND circuit, the name printer 6 outputs a zero reset signal of the name information and film number of the next subject C. Next, the operation of this embodiment will be described.

Now, as shown in FIG.
Is in a horizontal position. In this horizontal position, the pressure sensor 8 does not receive much pressure from the subject C, and as shown in FIG. 4, the detection voltage Vh from the detection circuit 9 is detected.
Becomes lower than the reference voltage Vref from the reference voltage generator 11, so that the ON signal is output from the comparator 10. On the other hand, the on-state signal is not output from the standing position detection device 3 because the imaging table 1 is not in the standing position. As described above, since the AND circuit 12 is not supplied with the ON signal from the upright position detector 3, the AND circuit 12 does not output the reset signal R. Therefore, the integration timer circuit 17
The cumulative time of is not unnecessarily reset to zero, or the zero information reset signal of the name information and film number of the next subject C is not output from the operation panel 14 to the name printer 6 without unnecessary progress, and the fluoroscopy and imaging are smoothly progressed. can do.

Further, during the fluoroscopic photographing, the photographing table 1 may be moved to a standing posture with the subject C placed thereon.
At this time, the upright position detection device 3 outputs an ON signal.
On the other hand, the entire weight of the subject C is applied to the pressure sensor 8, the detection voltage Vs of the detection circuit 9 becomes higher than the reference voltage Vref as shown in FIG. 4, and the ON signal is not output from the comparator 10. Therefore, the reset signal R is not output from the AND circuit 12, the integration time of the integration timer circuit 17 is unnecessarily reset to zero, and the name printer 6 and the film number of the next subject C are displayed from the operation panel 14 to the name printer 6. The zero reset signal is not output unnecessarily, and fluoroscopy and imaging can be progressed smoothly.

When the subject C currently being photographed has been photographed and the subject C is changed to the next subject C, the imaging table 1 is moved to a standing posture so that the subject C can easily descend. At this time, as described above, since the comparator 10 does not output the ON signal, the comparator 10 is not reset. And FIG.
As shown in (b), when the subject C descends from the imaging table 1, the pressure sensor 8 is released from the external pressure, the detection voltage V from the detection circuit 9 approaches zero without limit, and the comparator 10 outputs ON signal is output. On the other hand, the on-state signal is output from the upright position detection device 3 because the imaging table 1 is in the upright position. Therefore, the reset signal R is output from the AND circuit 12. The reset signal R is supplied to the integration timer circuit 17 via the OR circuit 13 and also to the operation panel 14. Upon receiving this reset signal R, the integration timer circuit 17 resets the integration time currently stored in memory to zero. Further, the operation panel 14 outputs the name reset information of the next subject C and the zero reset signal of the film number to the name printer 6. The name printer 6 changes the print name to the name of the next subject C, and resets the film number that has been stepping up according to the number of times of imaging to the initial value (1).

Although the reference voltage Vref may be zero, the following effects can be obtained by setting the reference voltage Vref to a value other than zero. That is, when the subject C gets on and off the imaging table 1, the pressure applied to the pressure sensor 8 fluctuates near zero, and the detection voltage V from the detection circuit 9 shows a zero value several times. At this time, if the reference voltage Vref is zero, the detection voltage Vref
Shows a positive value and the ON signal from the comparator 10 is once turned off, and then returns to the zero value again, the ON signal is output from the comparator 10 each time, and as a result, the AND circuit 1
The reset signal is repeatedly output from 2. Therefore,
Each time this reset signal is output, the reset operation is repeated, and the name of the subject C from the operation panel 14 is postponed in order. On the other hand, by setting the reference voltage Vref to a value other than zero, as described above, even if the pressure applied to the pressure sensor 8 fluctuates near zero, the detection voltage V from the detection circuit 9 becomes smaller than the reference voltage Vref. Since it fluctuates in a low range, the ON signal is continuously output from the comparator 10 without being turned off. Therefore, it is possible to solve the problem that the reset operation is repeated while getting on and off the subject C as described above.

As described above, in this embodiment, the photographing table 1 is used.
Is in a standing posture, and when the pressure applied to the pressure sensor 8 provided on the footrest 7 is below a predetermined level, it is determined that the subject C has been replaced and the reset operation is performed. It is possible to eliminate the burden on the operator who has repeatedly performed the reset operation every time the C is changed, and it is possible to reliably detect that the subject C has stepped down from the imaging table 1 and perform an unnecessary reset operation during the fluoroscopic imaging period. It can be prevented from being performed.

Further, the ON signal from the comparator 10 is continuously output when the detection voltage V from the detection circuit 9 is within the range from zero to the reference voltage Vref. The problem that the reset operation is repeated while getting on and off can be avoided.

The present invention is not limited to the above-mentioned embodiments, but can be modified in various ways. For example, if the above-mentioned reset signal is supplied to a medical information system that organically combines information of each department in a hospital, it can be used for preparation of storage of captured images, grasping the opening status of the imaging room, and the like.

[0025]

As described above, according to the present invention, in the X-ray diagnostic apparatus which includes the tilting type imaging table which can be tilted between the standing position and the tilted position and which controls the exposure time by the timer, the tilting imaging is performed. First detecting means for detecting the posture of the table, and second detecting means for detecting the pressure received from the subject when the table is placed on the tilt imaging table.
Since the detecting means and the means for detecting the standing position by the first means and performing the reset including the zero reset of the exposure time when the pressure detected by the second means means is equal to or less than a predetermined value, When the tilt imaging stand is in a standing posture and the pressure detected by the second means is equal to or less than a predetermined value, it is determined that the subject has been replaced and the reset operation is performed. Therefore, it is possible to eliminate the burden on the operator who has repeatedly performed the reset operation every time the subject is replaced, and it is possible to reliably detect that the subject has stepped down from the tilting imaging table and confirm that the subject is in the fluoroscopic imaging period. It is possible to prevent an unnecessary reset operation from being performed. Further, since it is determined whether or not the pressure detected by the second means is equal to or less than the predetermined value, it is possible to avoid the problem that the reset operation is repeated while getting on and off the subject.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of an X-ray diagnostic apparatus according to the present invention.

FIG. 2 is a diagram showing a subject name and a film number printed on a film.

FIG. 3 is a diagram showing a posture of a photographing table.

FIG. 4 is a graph showing the correlation between the pressure applied to the pressure sensor and the detection voltage from the detection circuit.

FIG. 5 is a diagram showing a configuration of a conventional X-ray diagnostic apparatus.

[Explanation of symbols]

1 ... Shooting table, 2 ... Tilt device, 3 ... Standing detection device, 4 ... X
Wire tube, 5 ... Arm, 6 ... Name printer, 7 ... Footrest, 8 ... Pressure sensor, 9 ... Detection circuit, 10 ... Comparator,
11 ... Reference voltage generator, 12 ... AND circuit, 13 ... OR
Circuit, 14 ... Operation panel, 15 ... X-ray control device, 16 ...
High voltage generator, 17 ... Integration timer circuit.

Claims (2)

[Claims] 1. An X-ray diagnostic apparatus comprising a tilting type imaging table which can be tilted between a standing position and a tilted position, and which manages an exposure time by a timer, wherein a first detection for detecting a posture of the tilting imaging table. Means, second detecting means for detecting a pressure received from the subject when the apparatus is placed on the tilt imaging table, pressure detected by the first means and standing by the second means. An X-ray diagnostic apparatus comprising means for performing reset including zero reset of the exposure time when is less than or equal to a predetermined value. 2. The X-ray diagnostic apparatus according to claim 1, wherein the second detecting means is a pressure sensor arranged on a step provided on the tilt imaging stand.