JPH08191829A - X-ray diagnostic apparatus - Google Patents

Abstract

PURPOSE: To form an image not deteriorated even when a subject or an X-ray imaging system is moved by providing a means increasing and decreasing the number of times of exposure per a unit time of pulse X-rays corresponding to the pressing quantity of a foot switch capable of being operated by a foot. CONSTITUTION: A foot switch 23 is provided to a bed 1 and the signal proportional to the pressing quantity of the switch is outputted from the switch. This foot switch signal is sent out to an X-ray control unit 7 as a foot switch stepping signal 24 stepwise changing corresponding to the stepping of the switch through a bed control unit 14. The X-ray control unit 7 determines the pulse rate corresponding to the foot switch stepping signal 24 to send a pulse rate changeover signal 16 to a television camera control unit 10. By this constitution, for example, by pressing the foot switch 23 at the time of the movement of a top plate 2, a pulse rate is raised without using the hand and the flicker of a fluoroscopic image is prevented.

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 for irradiating a subject with pulsed X-rays and capturing intermittent fluoroscopic images, and more particularly to a technique for controlling a pulse rate.

[0002]

2. Description of the Related Art In recent years, as medical diagnostic apparatuses have been developed, X-ray diagnostic apparatuses for irradiating a subject with pulsed X-rays for fluoroscopy are widely used. An X-ray diagnostic apparatus using pulsed X-rays is used, for example, to see where the distal end of the catheter is when inserting a catheter into a blood vessel of a subject and performing treatment. In such an X-ray diagnostic apparatus, conventionally, the pulse rate (the number of X-ray exposures per unit time) for irradiating a pulse X-ray is set to the frequency (60Hz / 50Hz or 30Hz / 25Hz) of a television camera.
z) was used to prevent the flicker of the perspective image.

However, due to recent advances in digital image processing technology, the generation rate of pulsed X-rays is 15 Hz / 1.
2.5Hz, 7.5Hz / 6.25Hz, 3.75Hz
/3.125Hz, 2Hz / 1.56Hz, 1Hz / 1
It has become possible to obtain a flicker-free perspective image even when fluoroscopy is performed with Hz or the like. That is, by reducing the repeated exposure rate of X-rays, it is possible to reduce the exposure to X-rays, which is a great advantage particularly in the case of catheter treatment which requires a long treatment time.

[0004]

However, if the pulse rate of X-rays is lowered, it is natural that a radiographic image is delayed. Normally, when the subject is stationary, the delay of this imaging does not significantly affect the fluoroscopy of the subject, but when the subject or the X-ray imaging system moves, the imaging delay due to the decrease in the pulse rate There is a drawback that the delay cannot be ignored and the deterioration of the image becomes remarkable.

The present invention has been made in order to solve such a conventional problem, and an object thereof is to prevent image deterioration even when a subject or an X-ray imaging system is moving. Another object of the present invention is to provide an X-ray diagnostic apparatus that does not give much radiation to a subject.

[0006]

In order to achieve the above object, the invention according to claim 1 of the present application comprises an X-ray tube and an X-ray image pickup means with a subject placed on a bed top sandwiched between them. Pulsed X-rays are intermittently radiated from the X-ray tube toward the subject, and the X-rays transmitted through the subject are collected by the X-ray image capturing means, and the collected signals are imaged. In an X-ray diagnostic apparatus that performs intermittent fluoroscopy by changing the number of exposures of a pulse X-ray per unit time to a foot switch that can be operated by a foot and the amount of pressing of the foot switch, is increased or decreased. The feature is that the increasing / decreasing means is provided.

According to a second aspect of the present invention, the X-ray tube and the X-ray image pickup means are arranged so as to face each other with the subject placed on the bed top being sandwiched between the X-ray tube and the subject. An X-ray diagnostic apparatus that intermittently irradiates pulse X-rays toward the subject, collects X-rays that have passed through the subject by the X-ray image capturing means, and images the collected signals to perform intermittent fluoroscopy. In the above, it is characterized in that it has a control means for increasing the number of times of exposure of the pulse X-ray per unit time while the bed top is moving.

Further, according to the invention of claim 3, the X-ray tube and the X-ray image pickup means are arranged so as to face each other with the subject placed on the bed top plate interposed therebetween, and the subject is moved from the X-ray tube. An X-ray diagnostic apparatus that intermittently irradiates pulse X-rays toward the subject, collects X-rays that have passed through the subject by the X-ray image capturing means, and images the collected signals to perform intermittent fluoroscopy. In the above, it is characterized in that it has control means for increasing the number of times of exposure of the pulse X-ray per unit time while the imaging means is moving.

[0009]

According to the present invention configured as described above, the bed top or the X-ray on which the subject is placed and the X-ray are controlled by the increasing / decreasing means for controlling the number of times of irradiation per unit time when the pulse X-ray is irradiated. It is controlled so that the number of times of X-ray exposure is increased while the X-ray imaging system including the tube, the X-ray image capturing means and the like is moving. Therefore, X-ray fluoroscopy is performed at a low pulse rate when the subject and the X-ray imaging system are relatively stationary, and at a high pulse rate when the X-ray imaging system is relatively moving, It is possible to prevent deterioration of image quality due to movement,
Moreover, the subject is not exposed to much radiation.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an X-ray diagnostic apparatus according to this embodiment, in which a subject 3 placed on a top plate 2 placed on a catheter bed 1 has an X-ray tube 4 and an I-ray. ． I. (Image intensifier) 5 is moved to a position sandwiched. And the X-ray tube 4 connected to the high voltage generator 6
Emits X-rays under the control of the X-ray controller 7
The line shows the I.I. I. The image is converted into an optical image in 5, captured by the television camera 8 and converted into a video signal 9. The obtained video signal 9 is supplied to the television camera control device 10.

The video signal 9 is displayed on the television camera control device 10.
Is digitally processed and sent to the monitor 11 as an interlaced monitor video signal 12 that can be displayed on the monitor 11. An inspector (not shown) can observe the fluoroscopic image on the monitor 11.

If the user wants to change the part to be imaged,
The inspector operates the couchtop release switch 13 attached to the couch top 2 to move the couch top 2. This time,
The couch controller 14 detects the operation of the couchtop release switch 13 and performs the couchtop release operation, and at the same time, outputs a couchtop movement signal 15 to the X-ray controller 7. When the X-ray controller 7 receives the top movement signal 15, it sends a pulse rate switching signal 16 to the television camera controller 10. Upon receiving the pulse rate switching signal 16, the television camera control device 10 prepares to switch from the next frame of the television synchronizing signal to the preset X-ray pulse rate, and sends the pulse rate switchable signal 17 to the X-ray control device 7. Output.

The X-ray controller 7 which has received the pulse rate switch enable signal 17 switches the pulse X-ray generated next to a large preset pulse rate and controls the high voltage generator 6 and the X-ray tube 4. Then, X-rays are generated at a higher pulse rate than when the bed top 2 is stationary.

Thus, the X-rays generated at a high pulse rate and transmitted through the subject 3 are I.D. I. 5 and the TV camera 8 similarly pick up the image, and the TV camera control device 10 digitally processes it to form a monitor video signal 12 which is displayed on the monitor 11.

Further, the X-ray diagnostic apparatus according to this embodiment is
X-ray tube 4 and I.D. I. It has a C-arm device 18 for holding 5, and the C-arm device 18 rotates and slides the C-arm 20 by an operation switch box 19.

At this time, the C-arm controller 21 outputs a C-arm operation signal 22 to the X-ray controller 7 when the C-arm 20 rotates or slides. Upon receiving the C-arm operation signal 22, the X-ray controller 7 performs the same operation as when the above-mentioned top movement signal 15 is input.

As described above, in this embodiment, when the relative position between the subject and the X-ray imaging system changes, the X-ray pulse rate is increased to obtain a fluoroscopic image with less time delay. You can Therefore, when moving the subject or C
A clear perspective image can be obtained even when the arm is moved. In addition, since the pulse rate of X-rays is set low when stationary, the subject is not exposed to much radiation.

As a second embodiment of the present invention, the bed 1 is provided with a foot switch 23. This foot switch 23
Outputs the switch pressing amount as a signal, and the foot switch signal is sent to the X-ray controller 7 as a foot switch depression signal 24 via the bed controller 14. Foot switch depression signal 2
4 changes stepwise according to the depression of the switch.
The X-ray controller 7 detects the foot switch depression signal, determines the pulse rate corresponding to the foot switch depression signal 24 that changes depending on the amount of depression, and sends the pulse rate switching signal 16 to the television camera controller 10. In this case, pulse X-rays are generated at a pulse rate corresponding to the foot switch depression signal, but the switching, image display, and observation are the same as when the top movement signal 15 is input.

Thus, in the second embodiment,
Since the increase / decrease of the pulse rate can be controlled by the foot switch 23, for example, by pressing the foot switch 23 when the top 2 is moved, the pulse rate can be increased and flicker of the fluoroscopic image can be prevented. . This allows the observer to switch the pulse rate as appropriate according to the content of the diagnosis. Further, since the foot switch is used, the pulse rate can be easily switched without using a hand.

In the above-described embodiment, the pulse rate is increased by stepping on the foot switch 23. However, when the foot switch 23 is first depressed, a pulse X-ray is emitted at a large pulse rate and the pulse rate is lowered in response to the stepping. May be.

The present invention is not limited to the above-described embodiments, but various modifications can be made without departing from the scope of the claims.

[0023]

As described above, according to the present invention, since the pulse rate can be switched appropriately, it is possible to prevent the deterioration of the image due to the time delay of the image when the change of the image is large. When there is little change in P, the effect of reducing exposure by using pulsed X-rays with a low pulse rate can be obtained.

[Brief description of drawings]

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

[Explanation of Codes] 1 couch 2 couch top 3 test object 4 x-ray tube 5 i. I. 7 X-ray control device 8 TV camera 11 Monitor 20 C-arm 23 Foot switch

Claims (3)

[Claims] 1. An X-ray tube and an X-ray image pick-up device are arranged to face each other with a subject placed on a bed top being sandwiched therebetween, and pulse X-rays are intermittently provided from the X-ray tube toward the subject. The X-rays that have been exposed to the X-rays and transmitted through the subject are collected by the X-ray image capturing means,
In an X-ray diagnostic apparatus that visualizes this collected signal for intermittent fluoroscopy, a foot switch operably provided by a foot and an exposure of the pulse X-ray per unit time according to a pressing amount of the foot switch. An X-ray diagnostic apparatus comprising an increasing / decreasing means for increasing / decreasing the number of shots. 2. An X-ray tube and an X-ray image capturing means are arranged so as to face each other with a subject placed on a bed top plate interposed therebetween, and pulse X-rays are intermittently provided from the X-ray tube toward the subject. The X-rays that have been exposed to the X-rays and transmitted through the subject are collected by the X-ray image capturing means,
An X-ray diagnostic apparatus for imaging the acquired signal and performing intermittent fluoroscopy has a control means for increasing the number of exposures of the pulsed X-ray per unit time when the bed top is moving. Characteristic X-ray diagnostic device. 3. An X-ray tube and an X-ray image pickup means are arranged so as to face each other with a subject placed on a bed top plate interposed therebetween, and pulse X-rays are intermittently provided from the X-ray tube toward the subject. The X-rays that have been exposed to the X-rays and transmitted through the subject are collected by the X-ray image capturing means,
An X-ray diagnostic apparatus for imaging the collected signal for intermittent fluoroscopy, further comprising control means for increasing the number of times the pulsed X-ray is exposed per unit time when the imaging means is moving. X-ray diagnostic device.