JP3432254B2 - X-ray diagnostic equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus for observing a subject by generating a video signal corresponding to an X-ray image of the subject using a television camera device having a solid-state image pickup device.

[0002]

2. Description of the Related Art A conventional X-ray diagnostic apparatus using a television camera device using a solid-state image pickup device, for example, a charge coupled device (hereinafter referred to as CCD) as an image pickup device will be described with reference to FIG.

Reference numeral 21 is a perspective photographing control device, and the perspective photographing control device 21 is a switch SW having two contacts of white W and black B.
have. Then, in the so-called see-through state in which the X-ray image of the subject 22 is observed on the image receiver, the operating piece is connected to the black B contact, and the see-through control signal S1 is output from the black B contact side. Further, in a so-called photographing state in which the subject 22 is photographed, the operating piece is connected to the white contact W, and the control signal S2 for photographing is used.
Is output from the white contact W side.

First, in the case of fluoroscopy for observing the subject 22,
The fluoroscopic control signal S1 output from the fluoroscopic imaging control device 21 is applied to the X-ray control device 23 and the motor M1. Then, when the fluoroscopic control signal S1 is applied to the X-ray controller 23, the X-ray controller 23 controls the X-ray tube 24 to emit X-rays having an intensity suitable for the fluoroscopic examination of the subject 22. The emitted X-rays pass through the subject 22 and generate an X-ray image.
This X-ray image is multiplied by the X-ray fluorescence multiplier 25 and simultaneously converted into a visible light image. The visible light image output from the X-ray fluorescence multiplier 25 is formed by the optical system 26, and the CCD camera 2
Added to 7. Then, in the CCD camera 27,
The visible light image is converted into an electric video signal. Also, CC
The video signal output from the D camera 27 is supplied to the image receiver 29 through an afterimage adding device such as a recursive filter 28, and the image of the subject 22 is displayed on the screen.

At this time, the control signal S1 output from the fluoroscopic imaging control device 21 is also applied to the motor M1. Therefore, the motor M1 is driven and the subject 2 called the top plate is driven.
The moving device 30 carrying 2 is moved. By such movement of the moving device 30, the site of the subject 22 to which the X-ray is irradiated is selected.

When the CCD camera 27 is used as a television camera device for converting a visible light image into a video signal, the CCD camera 27 has almost no afterimage. Therefore, the image signal of the CCD camera 27 is directly received by the receiver 2
In addition to 9, the X-ray quantum noise included in the X-ray image is not smoothed. Therefore, the recursive filter 28 is used to add a pseudo afterimage to the video signal, and then the image signal is supplied to the image receiver 29.

Next, when the subject 22 is photographed by an X-ray photograph, the control signal S2 for photographing output from the fluoroscopic photographing control device 21 is applied to the X-ray control device 23 and the motors M2, M3. When the control signal S2 is applied to the X-ray controller 23, the X-ray tube 24 is controlled to emit X-rays having an intensity suitable for taking an X-ray photograph. At this time, the X-ray film 31 is arranged on the front surface of the X-ray fluorescence multiplier tube 25 by driving the motor M2, and the X-ray fluorescence multiplier tube 25 is driven by driving the motor M3.
A mechanical optical diaphragm 32 is disposed between the optical system 26 and the optical system 26.

By the way, when the subject 22 is photographed by X-ray photography, the X-ray intensity is higher than that when the subject 22 is observed by fluoroscopy.
Rays are emitted from the x-ray tube 24. Therefore, if you try to monitor the moment of shooting using the CCD camera 27,
An excessive amount of light is incident on the CCD camera 27 and a normal image cannot be obtained. For this reason, the optical diaphragm 32 is arranged in the subsequent stage of the X-ray fluorescence multiplier 25 to limit the amount of light incident on the CCD camera 27.

The CCD, which is the image pickup device of the CCD camera 27, operates in a frame accumulation mode and a field accumulation mode . CCD camera 27 of X- ray diagnostic apparatus
In this case, the frame accumulation mode having a higher vertical resolution is more often used.

[0010]

When observing various parts of the subject 22 through observation, or when selecting an imaging part of the subject 22, the subject 22 is observed while moving the moving device 30 by the motor M1. Done.

However, when the subject 22 is observed in a state where the relative position between the subject 22 and the CCD camera 27 changes, when the recursive filter 28 is in the operating state, as compared with the case where the recursive filter 28 is not in the operating state, as shown in FIG. As the amplitude modulation degree decreases, the image becomes blurred. FIG. 3 is a characteristic diagram of the amplitude modulation degree of the CCD camera, in which the horizontal axis represents the moving speed (relative value) and the vertical axis represents the amplitude modulation degree. A curve A indicates when the recursive filter 28 is in the operating state, and a curve B indicates when the recursive filter 28 is not in the operating state.

Even when the recursive filter 28 is not in operation, when the CCD camera 27 is in the frame accumulation mode (curve A) as shown in FIG. 4, the dynamic resolution is higher than that in the field accumulation mode (curve B). Is lowered and the image is blurred. FIG. 4 is a dynamic resolution characteristic diagram of the CCD camera, in which the horizontal axis is the resolution chart moving speed (relative value),
The vertical axis represents the horizontal dynamic resolution (relative value).

Further, a mechanical optical diaphragm is separately provided so that an excessive amount of light does not enter the CCD camera 27 when taking an X-ray photograph. However, when the optical diaphragm is provided, the number of mechanical parts and electric parts is increased correspondingly, the entire apparatus is complicated, and the reliability is lowered. It also causes a cost increase.

The present invention solves the above-mentioned drawbacks.
When the positions of the subject and the CCD camera change relative to each other, a clear image can be obtained without a decrease in the amplitude modulation degree or the resolution, and no special optical aperture is required when the subject is imaged. An object is to provide an X-ray diagnostic apparatus.

[0015]

SUMMARY OF THE INVENTION The present invention relates to an X-ray of a subject.
An image conversion device for converting a line image into a visible light image, an optical system for forming the visible light image converted by the image conversion device, and the visible light image formed by the optical system into a video signal. Converted,
An X-ray including a television camera device having a solid-state image pickup device, an afterimage adding device that artificially adds an afterimage component to a video signal output from the television camera device, and an image receiver that displays the video signal. In the diagnostic device, the television camera device is operated in the field storage mode during a fluoroscopic period in which an X-ray image of the subject is observed on a receiver while the relative position of the subject and the television camera device changes. Alternatively, the afterimage adding device is in a non-operating state.

Further, during the photographing period for photographing the X-ray image of the subject with an X-ray film, the television camera device is operated in the shutter mode.

[0017]

According to the above construction, the television camera device is operated during the fluoroscopic observation period in which the X-ray image of the subject is observed on the receiver while the relative positions of the subject and the television camera device are changed. It is operated in the field accumulation mode, or the afterimage adding device is in a non-operating state. Therefore, when the relative position between the subject and the television camera device changes, the television camera device is in the field storage mode, so that the reduction of the dynamic resolution can be prevented. Also,
When the afterimage adding device is in the non-operating state, it is possible to prevent a decrease in the amplitude modulation degree . If the television camera device is set to the field storage mode and at the same time the afterimage adding device is set to the non-operating state, the effects of both can be obtained together.

Further, in a photographing state in which an X-ray image of the subject is photographed with an X-ray film, the television camera device is operated in the shutter mode. By operating the TV camera device in shutter mode, you can adjust the storage time for storing the input optical image in the image sensor,
It can have a function like a shutter. Therefore, it is not necessary to separately provide a mechanical optical diaphragm, the structure of the device can be simplified, and the cost can be reduced.

[0019]

EXAMPLE An example of the present invention will be described with reference to FIG.

Reference numeral 1 is a fluoroscopic imaging control device. The fluoroscopic imaging control apparatus 1 outputs a fluoroscopic control signal S1 such as moving the subject when observing various parts of the subject with X-ray images, and also takes an X-ray image of the subject. If so, the control signal S2 for photographing is output.

First, in the case of the fluoroscopic state in which the subject 2 is observed on the image receiver, the fluoroscopic imaging control device 1 outputs the fluoroscopic control signal S1, the X-ray control device 3, the motor M1, the CCD camera 4, and the like. Afterimage adding devices, for example, are added to the relays R1 and R2 of the recursive filter 5, respectively.

When the control signal S1 is applied to the X-ray controller 3, the X-ray tube 6 is controlled so that the X-ray tube 6 emits an X-ray having an intensity suitable for fluoroscopy for observing the subject 2. The emitted X-rays pass through the subject 2 and generate an X-ray image. The X-ray image is multiplied by the X-ray fluorescence multiplier 7 and simultaneously converted into a visible light image. The visible light image output from the X-ray fluorescence multiplier 7 is formed by the optical system 8. Further, the CCD camera 4 is arranged at a position where a visible light image is formed, and the visible light image is converted into an electric video signal and output. In addition, CCD camera 4
The video signal output from the receiver is supplied from the recursive filter 5 to the receiver 9, and the image of the subject 2 is displayed on the screen.

The control signal S1 output from the fluoroscopic imaging control device 1 is also applied to the motor M1 and the motor M1
Is in a driving state. By driving the motor M1, the moving device 10 on which the subject 2 is placed moves, and the position of the subject 2 is adjusted. By adjusting the position of the subject 2 in this way, a site for observing the subject 2 and an imaging region of the subject 2 are selected.

The control signal S1 is also applied to the relay R1. The operation piece is connected to the white contact W by the operation of the relay R1, and the operation mode of the CCD camera 4 is switched to the field storage mode FI.

The control signal S1 is also applied to the relay R2, and the operating piece is connected to the white contact W. As a result, the recursive filter 8 is in a non-operation (OFF) state. In this non-operation (OFF) state, the recursive filter 8 is
No pseudo afterimage is added to the video signal output from the CCD camera 4.

As described above, the control signal S is sent to the motor M1.
When 1 is added and the moving device 11 on which the subject 4 is placed moves, and thus the relative position between the subject 2 and the CCD camera 4 changes, the operation mode of the CCD camera 4 is the field storage mode FI, and The recursive filter 5 is in a non-operation (OFF) state. Therefore, it is possible to avoid a decrease in the resolution of the CCD camera 4 and a decrease in the amplitude modulation degree of the recursive filter 5.

When the subject 2 is observed in a stationary state, the output of the control signal S1 is stopped and the movement of the moving device 10 on which the subject 2 is placed is stopped. At this time, the relay R1,
Since the control signal S1 is not added to R2, the operating piece is the black contact B
, The operation mode of the CCD camera 4 is the frame accumulation mode FR, and the recursive filter 5 is in the operation (ON) state. Recursive filter 5 works (O
In the N) state, the recursive filter 5 functions to add a pseudo afterimage to the image signal output from the CCD camera 4 and smooth the X-ray quantum noise included in the X-ray image.

In this way, when the subject 2 is observed in a stationary state, the moving device 10 on which the subject 2 is placed is stopped and the relative position between the subject 2 and the CCD camera 4 is constant. At this time, the operation mode of the CCD camera 7 is the frame accumulation mode FR, and the recursive filter 8 operates (ON).
Since it is in the state, it is possible to obtain an image in which the resolution and the characteristics of the amplitude modulation degree are improved.

In the above embodiment, the CCD camera 4
The operation mode is described in the frame accumulation mode FR, and the recursive filter 5 is in the operation (ON) state at the same time. However, it may be configured so that only one of them is switched.

Next, in the photographing state in which the subject 2 is photographed by X-ray photography, the control signal S for photographing is transmitted from the fluoroscopic photographing control device 1.
2 is output and applied to the X-ray controller 3, the motor M2, and the relay R3 of the CCD camera 4. When the control signal S2 is applied to the X-ray controller 3, the X-ray tube 6 is controlled so that the X-ray tube 6 emits X-rays having an intensity suitable for taking an X-ray photograph. At this time, by driving the motor M2, the X-ray fluorescence multiplier 5
The X-ray film 11 is arranged on the front surface of the. In addition, the control signal S2 applied to the relay R3 connects the two operating pieces to the white contact W, and the CCD camera 4 is turned on in the shutter mode, and at the same time, the shutter speed can be adjusted. When the CCD camera 4 enters the shutter mode, the X-ray tube 6 emits a strong X-ray when taking a picture of the subject 2, and even if a large amount of light enters the CCD camera 4, the CCD camera 4 is Operates so that normal images can be obtained.

In the radiographing state of the subject 2 as an X-ray photograph, the relative position between the subject 2 and the CCD camera 4 is constant because the moving device 10 is stopped. In this case, since the control signal S1 is not output, the relay R
The operation pieces 1 and R2 are connected to the black contact B , the operation mode of the CCD camera 4 is the frame accumulation mode FR, and the recursive filter 5 is in the operation (ON) state.

By setting the CCD camera 4 in the shutter mode, a normal image can be obtained even when a large amount of light is incident on the CCD camera 7. Therefore, since it is not necessary to separately provide a mechanical optical diaphragm to the outside, the structure of the entire apparatus is simplified, the reliability is increased, and the cost is reduced.

[0033]

According to the present invention, the operating states of the television camera and the recursive filter can be switched according to the operating mode of the X-ray diagnostic apparatus, and a high-resolution image can be obtained. Also, when monitoring the image at the moment when the subject is imaged, an optical aperture is not required, so reliability is increased and cost is reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional example.

FIG. 3 is a characteristic diagram illustrating a conventional example.

FIG. 4 is a characteristic diagram illustrating a conventional example.

[Explanation of symbols]

1. Fluoroscopic imaging control device 2 ... Subject 3 ... X-ray control device 4 ... CCD camera 5 ... Recursive filter 6 ... X-ray tube 7 ... X-ray fluorescence multiplier 8 ... Optical system 9 ... Receiver 10 ... Moving device 11 ... X-ray film M1, M2 ... Motor R1, R2, R3 ... Relay

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 60-230785 (JP, A) JP 5-153509 (JP, A) JP 58-61600 (JP, A) JP 5- 64081 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61B 6/00-6/14

Claims (3)

(57) [Claims] 1. An image conversion device for converting an X-ray image of a subject into a visible light image, an optical system for forming the visible light image converted by the image conversion device, and an image formed by this optical system. A television camera device that converts the visible light image into a video signal and has a solid-state imaging device, an afterimage adding device that adds an afterimage component to the video signal output from the television camera device, and the video signal is displayed. In the X-ray diagnostic apparatus including the image receiving device, the television is set in a fluoroscopic period during which the X-ray image of the subject is observed on the image receiving device while the relative position between the subject and the television camera device changes. An X-ray diagnostic apparatus which operates a camera device in a field storage mode. 2. An image conversion device for converting an X-ray image of a subject into a visible light image, an optical system for forming the visible light image converted by the image conversion device, and an image formed by this optical system. A television camera device that converts the visible light image into a video signal and has a solid-state imaging device, an afterimage adding device that adds an afterimage component to the video signal output from the television camera device, and the video signal is displayed. In the X-ray diagnostic apparatus including the image receiver, the residual image is observed during a fluoroscopic period in which the X-ray image of the object is observed on the image receiver while the relative position of the object and the television camera device changes. An X-ray diagnostic apparatus characterized in that an additional device is put into a non-operating state. 3. An image conversion device for converting an X-ray image of a subject into a visible light image, an optical system for forming the visible light image converted by the image conversion device, and an image formed by this optical system. A television camera device that converts the visible light image into a video signal and has a solid-state imaging device, an afterimage adding device that adds an afterimage component to the video signal output from the television camera device, and the video signal is displayed. An X-ray diagnostic apparatus including an image receiving device that operates the television camera device in a shutter mode during a photographing period in which an X-ray image of the subject is photographed with an X-ray film. apparatus.