阅读说明：本技术 Led亮度可调节的束光器、x射线发生器组件和医疗设备 (Light bundling device with adjustable LED brightness, X-ray generator assembly and medical equipment ) 是由 葛照强 于 2020-06-15 设计创作，主要内容包括：本发明涉及一种LED亮度可调节的束光器、X射线发生器组件、X射线医疗设备以及调节束光器的LED亮度的方法。根据一实施方式,LED亮度可调节的束光器设置于一X射线球管前方,包括：一束光器本体,所述束光器本体具有一窗口以透过所述X射线球管发出的X射线；一LED,所述LED设置于所述束光器本体内；一反射镜,所述反射镜设置于所述束光器本体内,用于反射所述LED发射的光线；一第一传感器,所述第一传感器设置于所述反射镜并处于X射线光路之外,用于感测所述LED亮度；以及一控制电路,所述控制电路用于基于一参考亮度值调节所述LED亮度。通过本发明的技术方案,束光器中的LED亮度可以通过闭环调节被设定为更为合理且稳定的亮度值。(The invention relates to a light-emitting diode (LED) brightness-adjustable light splitter, an X-ray generator assembly, X-ray medical equipment and a method for adjusting the LED brightness of the light splitter. According to one embodiment, an LED brightness adjustable beam splitter is disposed in front of an X-ray tube, comprising: the beam splitter body is provided with a window for transmitting X rays emitted by the X-ray bulb tube; the LED is arranged in the beam splitter body; the reflector is arranged in the beam splitter body and used for reflecting light rays emitted by the LED; the first sensor is arranged on the reflector and outside the X-ray light path and used for sensing the brightness of the LED; and the control circuit is used for adjusting the brightness of the LED based on a reference brightness value. By the technical scheme of the invention, the brightness of the LED in the beam light device can be set to be a more reasonable and stable brightness value through closed-loop adjustment.)

1. A light beam device with adjustable LED brightness is arranged in front of an X-ray bulb tube and comprises:

the beam splitter body is provided with a window for transmitting X rays emitted by the X-ray bulb tube;

the LED is arranged in the beam splitter body;

the reflector is arranged in the beam splitter body and used for reflecting light rays emitted by the LED;

the first sensor is arranged on the reflector and outside the X-ray light path and used for sensing the brightness of the LED; and

a control circuit for adjusting the brightness of the LED based on a reference brightness value.

2. The LED brightness adjustable beam splitter of claim 1 wherein the control circuit comprises:

a compensation unit, which is used for compensating and correcting the reference brightness value;

the adjusting unit is connected with the compensating unit; and

the LED driving unit is connected with the adjusting unit;

wherein the adjusting unit outputs a control signal to the LED driving unit based on the compensated and corrected reference brightness value and the feedback signal of the first sensor, and the LED driving unit adjusts the LED brightness based on the control signal.

3. The LED brightness adjustable beam splitter of claim 2 wherein the control circuit further comprises a detection unit connected to the compensation unit for detecting whether a radiation dosage component is disposed in the X-ray path, the compensation unit performing compensation correction of the reference brightness value based on the detection result of the detection unit.

4. The LED brightness adjustable beam splitter of claim 2 further comprising:

the second sensor is arranged on the outer wall of the beam splitter body and outside the light path of the X ray and used for sensing the ambient brightness of the beam splitter;

wherein the compensation unit compensates and corrects the reference brightness value based on a feedback signal of the second sensor.

5. The LED brightness adjustable beam splitter of claim 4, wherein the control circuit further comprises a detection unit connected to the compensation unit for detecting whether a radiation dose component is disposed in the X-ray beam path, and the compensation unit performs compensation correction on the reference brightness value based on the detection result of the detection unit and the feedback signal of the second sensor.

6. The LED brightness adjustable beam splitter of claim 4, wherein the second sensor is disposed at a bottom or side of the beam splitter body, opposite to an imaging area of an X-ray receiver.

7. The LED brightness adjustable beam splitter of claim 5 wherein the second sensor is configured to sense the brightness of light reflected by the X-ray receiver when the LED is on and the ambient brightness at which the beam splitter is located when the LED is off and to output a feedback signal based on the brightness relationship of the two times.

8. An X-ray generator assembly comprising an X-ray tube and a beam splitter according to any one of claims 1 to 7.

9. An X-ray medical device comprising the X-ray generator assembly of claim 8 and an X-ray receiver.

10. A method of adjusting LED brightness of a beam splitter, for use in the beam splitter of claim 1, comprising:

sensing the brightness of the LED in real time; and

and adjusting the brightness of the LED based on a reference brightness value.

11. The method of adjusting LED brightness of a beam splitter as claimed in claim 10, further comprising:

performing compensation correction on the reference brightness value; and

adjusting the LED brightness based on the compensated and corrected reference brightness value.

12. The method of adjusting LED brightness of a beam splitter as claimed in claim 11, further comprising:

detecting whether a radiation dosage component is arranged in an X-ray light path; and

and performing compensation correction on the reference brightness value based on the detection result.

13. The method of adjusting LED brightness of a beam splitter as claimed in claim 11, further comprising:

sensing the ambient brightness of the beam bunching device; and

and compensating and correcting the reference brightness value based on the ambient brightness of the beam splitter.

14. The method of adjusting LED brightness of a beam splitter as claimed in claim 13, further comprising:

detecting whether a radiation dosage component is arranged in an X-ray light path; and

and performing compensation correction on the reference brightness value based on the detection result and the ambient brightness of the beam splitter.

15. The method of adjusting LED brightness of a beam splitter as claimed in claim 14, wherein the LED brightness is sensed when the LED is turned on and the ambient brightness of the beam splitter is sensed when the LED is turned off, and the reference brightness value is compensated based on the detection result and the brightness relationship of the two times.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a light-emitting diode (LED) brightness-adjustable light-bundling device, an X-ray generator assembly, X-ray medical equipment and a method for adjusting LED brightness of the light-bundling device.

Background

In an X-ray medical apparatus, a beam splitter is generally equipped with an LED to simulate an X-ray radiation area by visible light. The brightness of the LED cannot be below a specified value, as required by the relevant legislation. However, the brightness and contrast of an LED may be affected by a number of factors. For example, setting the Dose Area Product (DAP) or increasing the Source Image Distance (SID), etc., can result in a decrease in the brightness and contrast of the LED. As an LED ages during use, its brightness and contrast also decreases.

In prior designs, the LED brightness was typically set to a fixed value that was much higher than the specified value, for example, in the case of a SID of 100cm, the brightness was set to over 210 lux to ensure that the brightness of the LED met the regulatory requirements throughout the lifetime of the beam. However, high brightness can lead to high temperatures during operation of the LED, which can shorten the life of the LED. At present, due to the lack of closed-loop control over the LEDs in the beam splitter, the brightness and contrast of the LEDs cannot be guaranteed to be stable and durable for the user.

Therefore, there is a need to provide a related solution to adjust LED brightness in a beam splitter.

Disclosure of Invention

In view of the above, the present invention provides a light beam splitter with adjustable LED brightness, disposed in front of an X-ray tube, comprising: the beam splitter body is provided with a window for transmitting X rays emitted by the X-ray bulb tube; the LED is arranged in the beam splitter body; the reflector is arranged in the beam splitter body and used for reflecting light rays emitted by the LED; the first sensor is arranged on the reflector and outside the X-ray light path and used for sensing the brightness of the LED; and the control circuit is used for adjusting the brightness of the LED based on a reference brightness value.

Wherein the control circuit comprises: a compensation unit, which is used for compensating and correcting the reference brightness value; the adjusting unit is connected with the compensating unit; the LED driving unit is connected with the adjusting unit; wherein the adjusting unit outputs a control signal to the LED driving unit based on the compensated and corrected reference brightness value and the feedback signal of the first sensor, and the LED driving unit adjusts the LED brightness based on the control signal.

The control circuit further comprises a detection unit connected with the compensation unit and used for detecting whether a radiation dosage component is arranged in an X-ray light path or not, and the compensation unit carries out compensation correction on the reference brightness value based on a detection result of the detection unit.

Wherein, a light ware still includes with adjustable LED luminance: the second sensor is arranged on the outer wall of the beam splitter body and outside the light path of the X ray and used for sensing the ambient brightness of the beam splitter; wherein the compensation unit compensates and corrects the reference brightness value based on a feedback signal of the second sensor.

The control circuit further comprises a detection unit connected with the compensation unit and used for detecting whether a radiation dosage component is arranged in an X-ray light path or not, and the compensation unit carries out compensation correction on the reference brightness value based on a detection result of the detection unit and a feedback signal of the second sensor.

The second sensor is arranged at the bottom or the side of the beam splitter body and is positively opposite to an imaging area of an X-ray receiver.

Wherein the second sensor is configured to sense the brightness of the light reflected by the X-ray receiver when the LED is turned on and the ambient brightness of the beam light device when the LED is turned off, and output a feedback signal based on the brightness relationship between the two times.

The invention also provides an X-ray generator assembly comprising an X-ray bulb and any one of the beam splitters described above.

The invention also provides an X-ray medical device which comprises the X-ray generator assembly and an X-ray receiver.

The invention also proposes a method of adjusting the brightness of an LED of a beam splitter, for use in a beam splitter as described above, comprising: sensing the brightness of the LED in real time; and adjusting the brightness of the LED based on a reference brightness value.

The method for adjusting the LED brightness of the beam splitter further comprises the following steps: performing compensation correction on the reference brightness value; and adjusting the LED brightness based on the compensated and corrected reference brightness value.

The method for adjusting the LED brightness of the beam splitter further comprises the following steps: detecting whether a radiation dosage component is arranged in an X-ray light path; and performing compensation correction on the reference brightness value based on the detection result.

The method for adjusting the LED brightness of the beam splitter further comprises the following steps: sensing the ambient brightness of the beam bunching device; and compensating and correcting the reference brightness value based on the ambient brightness of the beam splitter.

The method for adjusting the LED brightness of the beam splitter further comprises the following steps: detecting whether a radiation dosage component is arranged in an X-ray light path; and performing compensation correction on the reference brightness value based on the detection result and the ambient brightness of the beam splitter.

And sensing the brightness of the LED when the LED is switched on and sensing the ambient brightness of the beam splitter when the LED is switched off, and performing compensation correction on the reference brightness value based on the detection result and the brightness relationship of the two times.

Through the technical scheme of the invention, the brightness of the LED in the beam light device can be set to be a more reasonable and stable brightness value through closed-loop regulation in the whole life cycle of the LED, and the LED brightness control method and the LED brightness control device are not influenced by factors such as aging of the LED, setting of a radiation dose component and the like. Meanwhile, the contrast of the LED can be automatically adjusted according to different source image distances and ambient light intensities. In addition, the service life of the LED can be prolonged because the heat productivity of the LED is reduced by avoiding setting the brightness of the LED to be an excessively high brightness value.

Drawings

The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail embodiments thereof with reference to the attached drawings in which:

FIG. 1 is a schematic illustration of an LED brightness adjustable beam splitter according to an embodiment of the present invention.

Fig. 2 is a schematic illustration of a control circuit according to an embodiment of the present invention.

Fig. 3 is a schematic illustration of a control circuit according to another embodiment of the present invention.

FIG. 4 is a schematic illustration of an X-ray generator assembly according to an embodiment of the present invention.

FIG. 5 is a schematic flow chart of a method of adjusting the brightness of an LED of a beam splitter according to one embodiment of the present invention.

Wherein the reference numbers are as follows:

100. 420 bundle light device

200 bulb

110 bundle light device body

10 LED

20 reflector

30 first sensor

40 second sensor

R X ray path

Q imaging area

80. 90 control circuit

81. 92 regulating unit

82. 93 LED drive unit

91 compensating unit

94 detection unit

Ref reference luminance value

Ref' compensated reference brightness value

S1, S2 feedback signal

400X-ray generator assembly

410X-ray bulb tube

500 method

S510, S520

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.

For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled.

In this document, "a" or "an" means not only "but also" more than one ". In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree of importance and order thereof, and the premise that each other exists, and the like.

Referring initially to fig. 1, fig. 1 is a schematic illustration of an LED brightness adjustable beam splitter according to an embodiment of the present invention. As shown in fig. 1, the light beam device 100 with adjustable LED brightness is disposed in front of an X-ray tube 200, and the light beam device 100 includes a light beam device body 110, an LED10, a reflector 20, a first sensor 30, and a control circuit (not shown in fig. 1).

The light splitter body 110 has a window for transmitting X-rays emitted from the X-ray tube 200, the LED10 is disposed in the light splitter body 110, the reflector 20 is disposed in the light splitter body 110 for reflecting light emitted from the LED10, the first sensor 30 is disposed on the reflector 20 and outside an X-ray optical path R (a triangular area shown by a solid line in fig. 1) for sensing brightness of the LED10, only the position where the first sensor 30 is disposed is schematically shown in fig. 1, the present invention is not limited thereto, and the position where the first sensor 30 is disposed only needs to be outside the X-ray optical path and can sense brightness of light emitted from the LED10 in real time.

The control circuit is used for adjusting the brightness of the LED10 based on a reference brightness value Ref. The control circuit may be a control unit in the beam splitter for controlling the size of the window thereof, or may be an additional control device independent of the existing control unit in the beam splitter, which is not limited by the present invention.

Wherein the reference brightness value Ref is a preset target brightness value, and the brightness of the LED can be adjusted in a closed loop manner based on the preset target brightness value and the real-time brightness of the LED10 fed back by the first sensor 30. For example, the reference brightness value Ref may be set with a proper margin on the basis of the brightness value required by the regulation, for example, if the brightness value required by the regulation is 160 lux, the reference brightness value Ref may be set to 170 lux.

The control circuit is illustrated below with reference to fig. 2. Referring to fig. 2, fig. 2 is a schematic illustration of a control circuit according to an embodiment of the present invention. The control circuit 80 includes a regulating unit 81 and an LED driving unit 82. Wherein the reference brightness value Ref and the feedback signal S1 of the first sensor 30 are input signals of the adjusting unit 81, the adjusting unit 81 outputs a control signal to the LED driving unit 82 based on the input signals, and the LED brightness is controlled by the LED driving unit 82. In the embodiment, the adjusting unit 81 may be, for example, a proportional-integral regulator (PI regulator), and the invention is not limited thereto. The brightness of the LED10 can be adjusted by the adjusting unit 81 with reference to the reference brightness value Ref, so that the brightness of the LED is kept at a stable value, and meets the requirement of brightness by law, for example, when the brightness of the LED decreases with aging, the adjusting unit 81 can increase the LED current and increase the LED brightness.

In a variation, the reference brightness value Ref may be compensated for by a combination of compensation correction factors, and the LED brightness may be adjusted based on the compensated and corrected reference brightness value Ref' and the feedback signal S1 of the first sensor 30. For example, the reference brightness value may be compensated in consideration of whether a radiation dose part is provided in the X-ray optical path and/or the ambient brightness of the beam splitter 100.

Referring to fig. 3, fig. 3 is a schematic illustration of a control circuit according to another embodiment of the present invention. Various embodiments of the control circuit are described below in conjunction with fig. 3, and similar content to that described in conjunction with fig. 2 will only be described briefly or omitted.

In the embodiment shown in fig. 3, the control circuit 90 includes a compensation unit 91, an adjustment unit 92, and an LED driving unit 93. The compensation unit 91 is used for compensating and correcting the reference brightness value Ref, the adjustment unit 92 is connected to the compensation unit 91, and the LED driving unit 93 is connected to the adjustment unit 92. Wherein the adjusting unit 92 outputs a control signal to the LED driving unit 93 based on the compensated and corrected reference brightness value Ref' and the feedback signal S1 of the first sensor 30, and the LED driving unit 93 adjusts the LED brightness based on the control signal.

In a variant embodiment, the control circuit 90 further comprises a detection unit 94, the detection unit 94 is connected to the compensation unit 91 for detecting whether a radiation dosage component (not shown) is disposed in the X-ray beam path, and the compensation unit 91 performs compensation correction on the reference brightness value Ref based on the detection result of the detection unit 94.

Specifically, in the case where the first sensor 30 is provided, if a radiation dose member is provided in the X-ray optical path, after compensation correction is performed on the reference luminance value Ref based on the situation, the LED luminance is adjusted based on the compensation-corrected reference luminance value Ref' and the feedback signal S1 of the first sensor 30. For example, due to the radiation dose member being set, the reference brightness value Ref is increased by a predetermined value to obtain a compensated corrected reference brightness value Ref'.

In other embodiments, detection of the ambient brightness at which the beam splitter 100 is located may be increased and taken into account when adjusting the brightness of the LEDs. Referring to fig. 1 and 3, the beam splitter 100 may further include a second sensor 40 disposed on an outer wall of the beam splitter body 110 and outside the optical path R of the X-rays, for sensing the brightness of the environment where the beam splitter 100 is located. The reference brightness value Ref and the feedback signal S2 of the second sensor 40 are used as input signals of the compensation unit 91, and the compensation unit 91 compensates and corrects the reference brightness value Ref based on the feedback signal S2 of the second sensor 40 to obtain a compensated and corrected reference brightness value Ref'. The adjusting unit 92 outputs a control signal to the LED driving unit 93 based on the compensation-corrected reference luminance value Ref' and the feedback signal S1 of the first sensor 30, and the LED driving unit 93 adjusts the LED luminance based on the control signal.

In the case where the first sensor 30 and the second sensor 40 are provided, if a radiation dose member is provided in the X-ray optical path, the reference brightness value Ref is compensation-corrected based on the condition of the radiation dose member and the feedback signal S2 of the second sensor 40, and then the LED brightness is adjusted based on the compensation-corrected reference brightness value Ref' and the feedback signal S1 of the first sensor 30.

Wherein, the second sensor 40 can be disposed at the bottom or the side of the beam splitter body 110, which is opposite to the imaging area Q of an X-ray receiver. In the embodiment shown in fig. 1, the second sensor 40 is schematically illustrated as being disposed at the bottom of the beam splitter body 110, and in other embodiments, a person skilled in the art can flexibly set the position of the second sensor 40, which is not limited to the illustration.

The second sensor 40 is configured to sense the brightness of the light reflected by the X-ray receiver when the LED10 is turned on and the brightness of the environment in which the beam light 100 is located when the LED10 is turned off, and to output a feedback signal based on the brightness relationship of the two times. For example, the contrast of the LED may be calculated and the feedback signal may be output based on a difference relationship or a proportional relationship between two ambient brightness. By means of the second sensor 40, the brightness control of the LED10 of the beam splitter 100 can be made more intelligent and automated adjustments can be made as the ambient brightness changes.

In practice, when the beam splitter 100 is used in an X-ray medical system, when the source image distance of the X-ray medical system is increased, the contrast of the light emitted from the LED10 of the beam splitter 100 reflected by the imaging area Q of the X-ray receiver of the X-ray medical system is decreased, and at this time, the reference brightness value Ref is compensated and corrected, and the reference brightness value Ref is increased to obtain a compensated and corrected reference brightness value Ref', so as to increase the brightness of the LED, and accordingly, the contrast is also increased. The contrast of the light emitted by the LED10 of the beam splitter 100 that is reflected by the imaging area Q of the X-ray receiver of the X-ray medical system is also reduced as the ambient brightness in which the beam splitter 100 is located increases, and the brightness and thus the contrast of the LED can be increased in a similar manner.

Various embodiments of the present invention have been described above by way of example, wherein the positions and the number of the first sensor 30 and the second sensor 40 are not limited by way of example.

The light beam device with the adjustable LED brightness and the multiple implementation modes of the control circuit in the light beam device can detect the LED brightness in real time and adjust the LED brightness. Meanwhile, in order to better adjust the brightness of the LED, the conditions of the brightness of the environment where the light beam generator is located, whether a radiation dose component is arranged or not and the like can be comprehensively considered, so that the brightness of the LED of the light beam generator can be kept at a stable value meeting the requirements of regulations in the using process.

Those skilled in the art can flexibly select an appropriate LED brightness adjustment scheme according to a specific practical application scenario based on the technical teaching of the present invention, and the above illustration is not limited. For example, only one sensor may be provided to sense the LED brightness in real time and adjust the LED brightness based on whether a radiation dose component is provided; a plurality of sensors can be respectively arranged to sense the brightness of the LED and the brightness of the environment where the light beam generator is located in real time, and the brightness of the LED is adjusted according to whether the radiation dose component is arranged or not.

The invention also provides an X-ray generator assembly. Referring to fig. 4, fig. 4 is a schematic illustration of an X-ray generator assembly according to an embodiment of the present invention. As shown in FIG. 4, the X-ray generator assembly 400 includes an X-ray tube 410 and any of the beam splitters 420 described above.

The invention also provides an X-ray medical device which comprises the X-ray generator assembly and the X-ray receiver.

The present invention also provides a method of adjusting the brightness of an LED of a beam splitter, which may be used with the beam splitter as described above. The method provided by the present invention is schematically described below with reference to fig. 5, and similar matters to those described above with reference to fig. 1 to 4 are only briefly described or omitted.

As shown in fig. 5, fig. 5 is a schematic flow chart of a method of adjusting the brightness of an LED of a beam splitter according to an embodiment of the present invention. Referring to fig. 1 in combination, the method 500 may be applied to a beam splitter 100, the beam splitter 100 being disposed in front of an X-ray tube 200, the beam splitter 100 including a beam splitter body 110, an LED10, a reflector 20, a first sensor 30, and a control circuit (not shown in fig. 1). The beam splitter body 110 has a window for transmitting X-rays emitted from the X-ray tube 200, the LED10 is disposed in the beam splitter body 110, the reflector 20 is disposed in the beam splitter body 110 for reflecting light emitted from the LED10, and the first sensor 30 is disposed on the reflector 20 and outside the X-ray path R (the triangular area shown by the solid line in fig. 1) for sensing the brightness of the LED 10. The method 500 includes the steps of:

step S510: sensing the brightness of the LED in real time; and

step S520: the LED brightness is adjusted based on the reference brightness value.

In an embodiment, the method 500 may further include the steps of: compensating and correcting the reference brightness value; and adjusting the brightness of the LED based on the compensated and corrected reference brightness value.

In an embodiment, the method 500 may further include the steps of: detecting whether a radiation dosage component is arranged in an X-ray light path; and performing compensation correction on the reference brightness value based on the detection result.

In an embodiment, the method 500 may further include the steps of: sensing the ambient brightness of the beam light device; and compensating and correcting the reference brightness value based on the ambient brightness of the beam splitter. In further embodiments, the method 500 may further include the steps of: detecting whether a radiation dosage component is arranged in an X-ray light path; and performing compensation correction on the reference brightness value based on the detection result and the ambient brightness of the beam splitter. The brightness of the LED is sensed when the LED is turned on, the ambient brightness of the light beam device is sensed when the LED is turned off, and the reference brightness value is compensated and corrected based on the detection result and the brightness relation of the two times.

The method for adjusting the LED brightness of the beam light device can detect the LED brightness in real time and adjust the LED brightness. Meanwhile, in order to better adjust the brightness of the LED, the conditions of the brightness of the environment where the light beam generator is located, whether a radiation dose component is arranged or not and the like can be comprehensively considered, so that the brightness of the LED of the light beam generator can be kept at a stable value meeting the requirements of regulations in the using process.

The invention relates to a light-emitting diode (LED) brightness-adjustable light splitter, an X-ray generator assembly, X-ray medical equipment and a method for adjusting the LED brightness of the light splitter. According to one embodiment, an LED brightness adjustable beam splitter is disposed in front of an X-ray tube, comprising: the beam splitter body is provided with a window for transmitting X rays emitted by the X-ray bulb tube; the LED is arranged in the beam splitter body; the reflector is arranged in the beam splitter body and used for reflecting light rays emitted by the LED; the first sensor is arranged on the reflector and outside the X-ray light path and used for sensing the brightness of the LED; and the control circuit is used for adjusting the brightness of the LED based on a reference brightness value. Through the technical scheme of the invention, the brightness of the LED in the beam light device can be set to be a more reasonable and stable brightness value through closed-loop regulation in the whole life cycle of the LED, and the LED brightness control method and the LED brightness control device are not influenced by factors such as aging of the LED, setting of a radiation dose component and the like. Meanwhile, the contrast of the LED can be automatically adjusted according to different source image distances and ambient light intensities. In addition, the service life of the LED can be prolonged because the heat productivity of the LED is reduced by avoiding setting the brightness of the LED to be an excessively high brightness value.

The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.