CN216167492U - Medical X-ray photography system - Google Patents

Abstract

The utility model provides a medical X-ray photography system, which comprises an X-ray generating device, a X-ray generating device and a control device, wherein the X-ray generating device is used for emitting X-rays; the beam limiter is arranged at the lower part of the X-ray generating device and is used for determining the projection area of the X-ray; the shooting unit is arranged outside the projection area and is used for shooting visible light images; and the optical path changing unit is arranged at the upper part or the lower part of the beam limiter and is used for changing the optical path of the visible light in the projection area so that the visible light after the optical path is changed is in the imaging field of view of the image pick-up unit. Or the central axis of the camera's field of view and the central axis of the X-ray are completely coincident, the camera's field of view will no longer be affected by the mounting angle and SID.

Description

Medical X-ray photography system

Technical Field

The utility model relates to the technical field of medical X-ray photography, in particular to a medical X-ray photography system.

Background

Nowadays, an imaging technique using X-rays is one of important techniques used in the medical field to acquire images of the inside of a human body. An X-ray imaging system, which is an imaging apparatus using X-rays, is used for imaging internal organs of a human body, imaging a structure of teeth, and imaging a head. The radiography system includes an X-ray generating device.

At present, some medical X-ray photography systems are additionally provided with monitoring devices for assisting doctors to observe and judge the position relation among the position of a patient, the field of view of a speed limiter, the position of a detector and the like. Generally, a medical X-ray radiography system is realized by adding an imaging unit and covering the whole X-ray detector with the view angle of the imaging unit. Since the installation position of the camera unit is limited by the hardware structure, it is generally impossible that the central axis of the Field of View (FOV) of the camera unit coincides with the central axis of the ray, so that the Field of View of the camera unit is affected by the installation angle and the distance from the X-ray Source to the image (SID).

The conventional imaging unit is usually mounted on one side of the housing of the X-ray generator. The installation mode enables the visual angle of the camera and the X-ray to follow, the distance and the direction of the visual angle of the camera and the X-ray can be kept basically consistent, and the camera visual field can always contain the irradiated object (or a patient). However, a specific camera mounting angle is required, and the irradiated region cannot appear in the center of the field of view of the imaging unit only when the SID is too large or too small.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a medical X-ray photographing system, which solves the problem that an irradiated area cannot appear in the center of a camera view field when the SID is too large or too small.

In order to solve the above technical problems, the present invention provides a medical X-ray imaging system, comprising

An X-ray generating device for emitting X-rays;

the beam limiter is arranged at the lower part of the X-ray generating device and is used for determining the projection area of the X-ray;

the shooting unit is arranged outside the projection area and is used for shooting visible light images;

and the optical path changing unit is arranged at the upper part or the lower part of the beam limiter and is used for changing the optical path of the visible light in the projection area so that the visible light after the optical path is changed is in the imaging field of view of the image pick-up unit.

Optionally, the optical path changing unit includes a reflective mirror, and the reflective mirror is disposed between the X-ray generating device and the beam limiter.

Optionally, the reflector and a plane defined by the beam limiter form a set angle, and the set angle is an acute angle or an obtuse angle.

Optionally, the optical path changing unit includes: the beam limiter comprises a beam splitter, a first lens and a second lens, wherein the beam splitter is arranged at the lower part of the beam limiter and comprises a first surface and a second surface which are oppositely arranged, the first surface is relatively close to the beam limiter, the second surface is relatively far away from the beam limiter, and the first surface covers the maximum opening of the beam limiter.

Optionally, the beam splitter and the beam limiter are located on the same optical axis, and an included angle between the beam splitter and the optical axis is an acute angle or an obtuse angle.

Optionally, the first surface is relatively close to the beam limiter and provided with at least one layer of antireflection film, and the second surface is relatively far from the beam limiter and provided with at least one layer of antireflection film.

Optionally, the optical splitter is an optical glass or prism optical splitter.

Optionally, the beam splitter is connected with a control motor, and the control motor is used for controlling the beam splitter to be automatically folded when the X-ray generating device emits X-rays.

Optionally, the medical X-ray photography system further includes: and the beam limiter light source is arranged at the upper part of the beam limiter and is positioned outside the projection area.

Based on the same inventive concept, the present invention also provides a medical X-ray photographing system, comprising:

an X-ray generating device for emitting X-rays;

the beam limiter is arranged at the lower part of the X-ray generating device and is used for determining the projection area of the X-ray;

the shooting unit is arranged outside the projection area and is used for shooting visible light images;

and the optical path changing unit is arranged at the upper part or the lower part of the beam limiter and is used for changing the optical path of the visible light in the projection area so that the central axis of the imaging field of view of the camera shooting unit is aligned with the central axis of the projection area.

Compared with the prior art, the utility model has the following beneficial effects:

the medical X-ray photography system comprises an X-ray generating device, a beam limiter, a light path changing unit and an image pick-up unit, wherein the X-ray generating device is used for emitting X-rays, and the beam limiter is arranged at the lower part of the X-ray generating device and used for determining the projection area of the X-rays; the shooting unit is arranged outside the projection area and is used for shooting visible light images; and the optical path changing unit is arranged at the upper part or the lower part of the beam limiter and is used for changing the optical path of the visible light in the projection area, so that the visible light after the optical path is changed is in the imaging visual field of the camera unit, the central axis of the visual field of the camera unit is completely coincided with the central axis of the ray, and the visual field of the camera unit is not influenced by the installation angle and the distance (SID) from the X-ray Source to the image any more. Furthermore, by arranging a beam splitter, the beam splitter and the beam limiter are located on the same optical axis, so that the visible light with the changed optical path is in the imaging view of the image pickup unit, or by arranging the image pickup unit close to the beam limiter light source, the visible light enters the reflector after passing through the beam limiter, and enters the image pickup unit after being reflected by the reflector, so that the image pickup unit can also reach a viewing angle at which the central axis of the view of the image pickup unit is approximately coincident with the central axis of the X-ray; therefore, the problem that the irradiated area cannot appear in the center of the camera view when the SID is too large or too small is solved.

Drawings

FIG. 1 is a schematic diagram of a medical radiography system in which SIDs are appropriate, as provided by an embodiment of the present invention;

FIG. 1a shows an image captured by an image capturing unit with an appropriate SID according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a medical radiography system in which SID is too short in accordance with an embodiment of the present invention;

FIG. 2a is a diagram illustrating an image captured by an image capturing unit when the SID is too short according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a medical radiography system with an excessive SID according to an embodiment of the present invention;

fig. 3a is an image captured by the image capturing unit with an excessively long SID according to the embodiment of the present invention;

FIG. 4 is a schematic view of a medical radiography system in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of a ray path of a beam splitter in a medical radiography system according to an embodiment of the present invention;

FIG. 6 is a flow chart of a monitoring method based on a medical radiography system according to an embodiment of the present invention;

FIG. 7 is a schematic view of another medical radiography system provided in accordance with an embodiment of the utility model;

in the figure, the position of the upper end of the main shaft,

101-an X-ray generating device; 102-an exposure shutter; 103-mirror; 104-a beam limiter light source; 105-a beam limiter; 106-a beam splitter; 107-camera unit, 107 a-camera unit takes a pattern; 108-an X-ray detector; 108 a-detector image; a-an incident light beam; b-transmitting the light beam; c-incident beam; d-reflected light beam.

Detailed Description

The medical radiography system according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

FIG. 1 is a schematic diagram of a medical radiography system in which SIDs are appropriate, as provided by an embodiment of the present invention; FIG. 1a shows an image captured by an image capturing unit with an appropriate SID according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a medical radiography system in which SID is too short in accordance with an embodiment of the present invention; FIG. 2a is a diagram illustrating an image captured by an image capturing unit when the SID is too short according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a medical radiography system with an excessive SID according to an embodiment of the present invention; fig. 3a is an image captured by the image capturing unit with an excessively long SID according to the embodiment of the present invention; the inventor has found that the imaging unit is usually installed on one side of the housing of the X-ray generating device, and in this installation mode, two camera installation angles also occur: the camera view is parallel or inclined to the X-ray irradiation direction. Both of these mounting angles have drawbacks: on one hand, when the visual angle of the camera is parallel to the X-ray irradiation direction, the irradiated area cannot be arranged in the center of the visual field of the camera, and when the SID is too small, the situation that part of the irradiated area exceeds the visual field may occur; on the other hand, when the camera view angle is biased to the X-ray irradiation direction, the irradiated region appears in the center of the camera view only at a certain SID, as shown in fig. 1 and fig. 1a, and the detector image 108a is located in the middle of the image pattern 107 of the image unit as shown in fig. 1, and the detector image 108a can be completely seen; when the SID is too large or too small, the irradiated area cannot appear in the center of the camera view, as shown in fig. 2 and fig. 2a, the detector image 108a is located at a position to the left of the shot pattern 107 of the camera unit, and the complete detector image 108a cannot be seen; and as shown in fig. 3 and 3a, the detector image 108a is located at the position to the right of the shooting pattern 107 of the camera unit, and the complete detector image 108a cannot be seen.

Fig. 4 is a schematic structural diagram of a medical X-ray imaging system according to an embodiment of the present invention. As shown in fig. 4, an embodiment of the present invention provides a medical X-ray imaging system including an X-ray generating apparatus 101, a beam limiter 105, an optical path changing unit, a beam limiter light source 104, and an imaging unit 107. The X-ray generating device 101 is used for emitting X-rays, and the beam limiter 105 is arranged at the lower part of the X-ray generating device 101 and used for determining the projection area of the X-rays; the X-rays pass through the beam limiter 105 to the object to be measured. The beam limiter light source 104 is arranged at the upper part of the beam limiter and is positioned outside the projection area, and the image pickup unit 107 is arranged outside the projection area and is used for shooting visible light images; and an optical path changing unit, disposed above or below the beam limiter 105, for changing an optical path of the visible light in the projection area, so that the visible light after the optical path change is in an imaging field of view of the image capturing unit 107 or a central axis of the imaging field of view of the image capturing unit 107 is aligned with a central axis of the projection area. The optical path changing unit includes a reflective mirror 103, the reflective mirror 103 is disposed between the X-ray generating device 101 and the beam limiter 105, and the reflective mirror 103 forms a set angle with a plane defined by the beam limiter 105, and the set angle is an acute angle or an obtuse angle. The beam limiter light source 104 is used to emit a first light beam that enables the operating physician to identify the projection area of the X-rays. The natural light reflected by the surface of the object to be detected can enter the imaging unit 107 through the light path changing unit, or a flat panel detector is arranged at the lower part of the beam limiter 105 and opposite to the X-ray generating device 101, and the natural light reflected by the surface of the flat panel detector can also enter the imaging unit 107 through the light path changing unit.

The first light beam may also be reflected by the object to be measured to form a second light beam, and the second light beam enters the imaging unit 107 in a direction perpendicular to the X-ray direction. It should be noted that in the embodiments of the present invention, the "upper" or "lower" of one structure on the other structure means that the two structures are physically separated from each other, and there is no structural connection relationship between the two structures, and the "upper" or "lower" merely refers to the relative relationship between the two structures in spatial position.

With continued reference to fig. 4, the optical path changing unit further includes an optical splitter 106, and the optical splitter 106 is disposed below the beam limiter 105. The beam splitter 106 and the beam limiter 105 are located on the same optical axis (the centers of the two are aligned up and down), in other words, the beam splitter 106 is located between the beam limiter 105 and the object to be measured, and the beam splitter 106 and the beam limiter 105 are aligned at the centers. The image capturing unit 107 and the beam splitter 106 are located at the same horizontal position, and visible light (including natural light or the second light beam in a scanning room) in the projection area can enter the image capturing unit 107 in a direction perpendicular to the X-ray direction after being reflected by the beam splitter 106. Of course, the second light beam may also enter the imaging unit 107 at an angle to the X-ray direction after being reflected.

The beam splitter 106 includes a first surface and a second surface, which are oppositely disposed, the first surface is relatively close to the beam limiter 105, the second surface is relatively far away from the beam limiter 105, the first surface covers the first light beam passing through the beam limiter 105 when the beam limiter 105 is opened to the maximum, the first surface is an X-ray or a first light beam incident surface, and the second surface is a visible light incident surface in the projection area. An included angle between the optical splitter 106 and a central axis of the X-ray emitting direction is an acute angle or an obtuse angle, and an included angle between the optical splitter 106 and the central axis of the X-ray emitting direction is, for example, 45 degrees or 50 degrees; in other words, the beam splitter 106 is not parallel and perpendicular to the central axis of the direction in which the X-rays exit. A first surface of the beam splitter 106 covers the first light beam that is transmitted through the beam limiter 105 at its largest opening. The visible light in the projection area reflected by the second surface of the beam splitter 106 completely covers the field of view of the image pickup unit 107.

The beam splitter 106 may be a thin film glass or a prism beam splitter.

In a preferred embodiment, the first surface of the beam splitter 106 is relatively close to the beam limiter 105 and is provided with at least one layer of antireflection film to increase the transmittance of the first light beam or the X-ray. In a specific implementation, the intensity of the first light beam or the X-ray may be increased to compensate for the transmittance of the first light beam or the X-ray, and when the transmittance of the first light beam or the X-ray is low and is not enough to display a clear image on the imaging unit 107, the transmittance of the first light beam or the X-ray may be compensated by increasing the brightness of the beam limiter light source 104, for example.

In addition, a second surface of the beam splitter 106 is relatively far away from the beam limiter 105 and is provided with at least one reflection increasing film to increase the reflectivity of the visible light at the projection area. In this embodiment, the reflectivity of the second surface is greater than 50%.

Fig. 5 is a schematic ray path diagram of a beam splitter in a medical radiography system according to an embodiment of the present invention. As shown in fig. 4 and fig. 5, an incident light beam a enters the first surface of the beam splitter 106 and is transmitted to obtain a transmitted light beam B, the incident light beam a is, for example, a first light beam emitted by the beam limiter light source 104 or X-rays emitted by the X-ray generating device 101, the incident light beam C is, for example, a second light beam or natural light reflected by the surface of the object to be detected, and the incident light beam C is reflected by the second surface of the beam splitter 106 to obtain a reflected light beam D.

An included angle between the reflective mirror 103 and a central axis of the exit direction of the X-ray is an acute angle or an obtuse angle, and an included angle between the reflective mirror 103 and the central axis of the exit direction of the X-ray is, for example, 45 degrees or 50 degrees; in other words, the central axis of the mirror 103 along which the X-rays exit is neither parallel nor perpendicular to the X-ray exit direction. The image pickup unit 107 is located at one side of the reflective mirror 103, the image pickup unit 107 is disposed close to the beam limiter light source 104, the visible light in the projection area passes through the beam limiter 105, is reflected by the reflective mirror 103, enters the image pickup unit 107 in a direction perpendicular to the X-ray direction or in a direction forming a certain angle with the X-ray direction, and the visible light in the projection area reflected by the reflective mirror 103 completely covers the field of view of the image pickup unit 107. Alternatively, the certain angle may be an acute angle, an obtuse angle, etc., for example, may be 75 °, 80 °, 95 °, 105 °, etc. The mirror 103 is, for example, an optical glass or a prism beam splitter.

The reflective mirror 103 and the beam splitter 106 are respectively connected with a control motor (not shown in the figure), the control motor is connected with the control of the exposure shutter, and the control motor can control the reflective mirror 103 and the beam splitter 106 to be automatically folded when the X-ray generating device emits X-rays, so as to reduce the attenuation of the X-rays.

An exposure shutter 102 is further disposed between the X-ray generating device 101 and the reflective mirror 103, and is used for controlling X-rays to enter the object to be measured. When the exposure shutter 102 is opened, the X-ray can enter the beam limiter 105 to reach the object to be measured; when the exposure shutter 102 is closed, the X-rays can be blocked from entering the beam limiter 105 to the object to be measured.

An X-ray detector 109 is disposed behind the object to be detected and is used for detecting an image of the X-ray passing through the object to be detected. The image capturing unit 107 is, for example, a video camera, and is configured to capture images of the field illuminated by the X-ray detector 108, the object to be measured, and the beam limiter 105, and connect a workstation of the medical X-ray radiography system through a data cable, and the workstation displays the image of the image capturing unit 107 on a display screen of the workstation.

Fig. 6 is a flowchart of a monitoring method based on a medical X-ray radiography system according to an embodiment of the present invention. The monitoring process of the medical radiography system described above will be described with reference to fig. 6.

First, step S10 is executed to close the exposure shutter button on the operation panel of the medical X-ray imaging system at the workstation, which is the pre-exposure stage.

Next, step S11 is executed, when the X-ray generating device 101 enters the preparation state, the beam limiter light source 104 is turned on, the projection of the field of view of the beam limiter 105 is displayed, the image capturing unit 107 is started at the same time, the images of the X-ray detector 108, the object to be measured and the field of view of the beam limiter 105 are collected, and the image capturing unit 107 is connected to a workstation of the medical X-ray photography system through a data cable, and the workstation displays the image of the image capturing unit 107 on a display screen of the workstation. The workstation displays the image on the display screen, and it is necessary to perform basic image processing such as white balance, distortion correction, and the like, which are well known to those skilled in the art, and thus will not be described in detail.

Then, step S12 is executed, and the operator confirms whether the positioning posture of the object 107 to be measured is correct and whether the field of view of the beam limiter is normal according to the image on the display screen of the workstation. The present embodiment relies on the experience of the photographer to make the judgment, and uses the real-time image collected by the camera unit 107 as the judgment basis. If the positioning posture is wrong or the field of the beam limiter is inclined, the shooting operation of X-ray photography is interrupted, the positioning of the object 107 to be detected is corrected again, or the field of the beam limiter is adjusted, the step S10 is returned to restart the operation until the positioning posture of the object 107 to be detected is correct and the field of the beam limiter is normal.

Next, step S13 is executed to open the exposure shutter 102, expose and capture an X-ray image, and the workstation displays the processed X-ray image on the workstation display screen, replacing the image of the imaging unit 107. After completion of shooting, the process returns to step S10.

Fig. 7 is a schematic structural diagram of another medical radiography system according to an embodiment of the present invention. As shown in fig. 7, the image pickup unit 107 in the medical X-ray imaging system is disposed close to the beam limiter light source 104, and the visible light in the projection area passes through the beam limiter 105 and is reflected by the mirror 103 to enter the image pickup unit 107. In such a medical X-ray imaging system, the beam splitter 106 may not be used, the imaging unit 107 may be disposed close to the beam limiter light source 104, and the imaging unit 107 may achieve an approximate angle of view. In this embodiment, a beam splitter is not used, and the camera unit can also achieve an approximate viewing angle, thereby saving the equipment cost.

In summary, in the medical X-ray photography system provided by the embodiment of the present invention, the X-ray generating device, the beam limiter, the reflective mirror and the camera unit are used for emitting X-rays; the beam limiter is arranged at the lower part of the X-ray generating device and is used for determining the projection area of the X-ray; a mirror as an optical path changing unit for changing an optical path of the visible light at the projection area; and the camera unit is arranged outside the projection area and is used for shooting a visible light image, so that the central axis of the visual field of the camera unit is completely coincided with the central axis of the ray, and the visual field of the camera unit is not influenced by the installation angle and the distance (SID) from the X-ray Source to the image any more. Furthermore, by arranging a beam splitter, the beam splitter and the beam limiter are located on the same optical axis, and beam limiter light sources are arranged around the beam limiter, and light emitted by the beam limiter light sources enters the image pickup unit in a direction perpendicular to the direction of the X-rays after being reflected by the beam splitter, or by arranging the image pickup unit close to the beam limiter light sources, the second light beam enters the reflective mirror after passing through the beam limiter and enters the image pickup unit after being reflected by the reflective mirror, so that the image pickup unit can also reach a viewing angle at which the central axis of the field of view of the image pickup unit approximately coincides with the central axis of the X-rays; therefore, the problem that the irradiated area cannot appear in the center of the camera view when the SID is too large or too small is solved.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (10)

1. A medical radiography system, comprising:

an X-ray generating device for emitting X-rays;

the beam limiter is arranged at the lower part of the X-ray generating device and is used for determining the projection area of the X-ray;

the shooting unit is arranged outside the projection area and is used for shooting visible light images;

and the optical path changing unit is arranged at the upper part or the lower part of the beam limiter and is used for changing the optical path of the visible light in the projection area so that the visible light after the optical path is changed is in the imaging field of view of the image pick-up unit.

2. The medical X-ray photographing system of claim 1, wherein the optical path changing unit includes a mirror disposed between the X-ray generating device and the beam limiter.

3. The medical radiography system of claim 2 wherein the mirror is at a set angle to a plane defined by the beam limiter, the set angle being acute or obtuse.

4. The medical X-ray photographing system of claim 1, wherein the optical path changing unit comprises:

the beam limiter comprises a beam splitter, a first lens and a second lens, wherein the beam splitter is arranged at the lower part of the beam limiter and comprises a first surface and a second surface which are oppositely arranged, the first surface is relatively close to the beam limiter, the second surface is relatively far away from the beam limiter, and the first surface covers the maximum opening of the beam limiter.

5. The medical radiography system of claim 4 wherein said beam splitter and said beam limiter are located on the same optical axis, and an angle between said beam splitter and said optical axis is an acute angle or an obtuse angle.

6. The medical radiography system of claim 4 wherein said first surface is relatively close to said beam limiter and is provided with at least one anti-reflection film, and said second surface is relatively far from said beam limiter and is provided with at least one anti-reflection film.

7. The medical radiography system of claim 4 wherein said beam splitter is an optical glass or prism beam splitter.

8. The medical radiography system of claim 4 wherein said beam splitter is connected to a control motor, said control motor being adapted to control said beam splitter to be automatically folded when said X-ray generating device emits X-rays.

9. The medical radiography system of claim 1 further comprising:

and the beam limiter light source is arranged at the upper part of the beam limiter and is positioned outside the projection area.

10. A medical radiography system, comprising:

an X-ray generating device for emitting X-rays;

the beam limiter is arranged at the lower part of the X-ray generating device and is used for determining the projection area of the X-ray;

the shooting unit is arranged outside the projection area and is used for shooting visible light images;

and the optical path changing unit is arranged at the upper part or the lower part of the beam limiter and is used for changing the optical path of the visible light in the projection area so that the central axis of the imaging field of view of the camera shooting unit is aligned with the central axis of the projection area.

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