阅读说明：本技术 一种x射线探测器与球管的自动跟踪对中装置 (Automatic tracking and centering device for X-ray detector and bulb tube ) 是由 徐风忠 黄洪智 徐玉欣 马春花 赵立岩 李海霞 于 2021-08-20 设计创作，主要内容包括：一种X射线探测器与球管的自动跟踪对中装置,探测器端电位器具有第一预设位置,球管端电位器具有第二预设位置,当探测器端电位器处于第一预设位置,且球管端电位器处于第二预设位置时,探测器端电位器和球管端电位器的电位相等；探测器端电位器和球管端电位器的电位相等时,X射线探测器的X射线管的焦点处于对中状态；当球管端电位器的电阻发生变化时,通过探测器端电机改变探测器端电位器的阻值,当探测器端电位器和球管端电位器的电位再次相等时,探测器端电机停止驱动,使X射线探测器的X射线管的焦点再次处于对中状态。本发明能够实现X射线探测器与球管的自动跟踪对中,降低了医务人员的劳动强度,提高了对位精度,减少了病人辐射伤害。(When the detector end potentiometer is in the first preset position and the bulb end potentiometer is in the second preset position, the potentials of the detector end potentiometer and the bulb end potentiometer are equal; when the electric phases of the detector end potentiometer and the bulb end potentiometer are equal, the focus of an X-ray tube of the X-ray detector is in a centering state; when the resistance of the bulb end potentiometer changes, the resistance value of the detector end potentiometer is changed through the detector end motor, when the potentials of the detector end potentiometer and the bulb end potentiometer are equal again, the detector end motor stops driving, and the focus of the X-ray tube of the X-ray detector is in a centering state again. The invention can realize the automatic tracking and centering of the X-ray detector and the bulb tube, reduce the labor intensity of medical personnel, improve the alignment precision and reduce the radiation injury of patients.)

1. An automatic tracking and centering device for an X-ray detector and a bulb tube is characterized by comprising a detector end motor (1), a detector end potentiometer (2) and a bulb tube end potentiometer (3);

the detector end potentiometer (2) is provided with a first preset position, the bulb end potentiometer (3) is provided with a second preset position, and when the detector end potentiometer (2) is located at the first preset position and the bulb end potentiometer (3) is located at the second preset position, the potentials of the detector end potentiometer (2) and the bulb end potentiometer (3) are equal;

when the electric phases of the detector end potentiometer (2) and the bulb tube end potentiometer (3) are equal, the focus of an X-ray tube of the X-ray detector is in a centering state;

when the resistance of the bulb end potentiometer (3) changes, the resistance value of the detector end potentiometer (2) is changed through the detector end motor (1), and when the potentials of the detector end potentiometer (2) and the bulb end potentiometer (3) are equal again, the detector end motor (1) stops driving, so that the focus of the X-ray tube of the X-ray detector is in a centering state again.

2. The automatic tracking and centering device for the X-ray detector and the bulb tube according to claim 1, wherein the detector end potentiometer (2) is fixed at the top end of a detector fixing upright post of the X-ray detector;

the bulb tube end potentiometer (3) is fixed at the top end of a bulb tube fixing upright post of the X-ray detector;

the resistance values of the detector end potentiometer (2) and the bulb end potentiometer (3) are changed in a wire pulling mode.

3. The automatic tracking and centering device for the X-ray detector and the bulb tube according to claim 1, further comprising a first operational amplifier (4), wherein a first input end of the first operational amplifier (4) is electrically connected with the detector-end potentiometer (2), and a second input end of the first operational amplifier (4) is electrically connected with the bulb-end potentiometer (3).

4. The automatic tracking and centering device for the X-ray detector and the bulb tube according to claim 3, wherein a plurality of detector-end filter resistors (5) are connected in series between the first input end of the first operational amplifier (4) and the detector-end potentiometer (2);

a detector end filter capacitor (6) is electrically connected between the detector end filter resistor (5) and the detector end potentiometer (2);

a plurality of bulb tube end filter resistors (7) are connected in series between the second input end of the first operational amplifier (4) and the bulb tube end potentiometer (3);

a bulb tube end filter capacitor (8) is electrically connected between the bulb tube end filter resistor (7) and the bulb tube end potentiometer (3);

and a feedback resistor (9) and a feedback capacitor (10) are connected in parallel between the second input end and the output end of the first operational amplifier (4).

5. The automatic tracking and centering device for the X-ray detector and the bulb tube according to claim 4, further comprising a second operational amplifier (11), wherein an output end of the first operational amplifier (4) is electrically connected with a first input end of the second operational amplifier (11), and a second input end of the second operational amplifier (11) is electrically connected with the detector end potentiometer (2).

6. The automatic tracking and centering device for the X-ray detector and the bulb tube according to claim 5, further comprising a third operational amplifier (12), wherein an output end of the first operational amplifier (4) is electrically connected with a first input end of the third operational amplifier (12), and a second input end of the third operational amplifier (12) is electrically connected with a detector-end potentiometer (2).

7. The automatic tracking and centering device for the X-ray detector and the bulb tube as claimed in claim 6, wherein a plurality of voltage dividing resistors are connected in series between the output end of the first operational amplifier (4) and the first input end of the second operational amplifier (11);

a plurality of divider resistors are connected in series between the second input end of the second operational amplifier (11) and the detector end potentiometer (2);

a plurality of divider resistors are connected in series between the output end of the first operational amplifier (4) and the first input end of the third operational amplifier (12);

and a plurality of divider resistors are connected in series between the second input end of the third operational amplifier (12) and the detector end potentiometer (2).

8. The automatic tracking and centering device for the X-ray detector and the bulb tube according to claim 7, further comprising a first triode (13) and a second triode (14);

the output end of the second operational amplifier (11) is electrically connected with the base level of the first triode (13), and the emission level of the first triode (13) is electrically connected with the detector end potentiometer (2);

the output end of the third operational amplifier (12) is electrically connected with the base level of the second triode (14), and the emission level of the second triode (14) is electrically connected with the detector end potentiometer (2).

9. The automatic tracking and centering device for the X-ray detector and the bulb tube according to claim 8, further comprising a first relay (15) and a second relay (16);

the collector stage of the first triode (13) is electrically connected with the first relay (15), and the first relay (15) is used for controlling the movement of the detector end motor (1) to reduce the potential of the detector potentiometer;

the collector stage of the second triode (14) is electrically connected with the second relay (16), and the second relay (16) is used for controlling the detector end motor (1) to move so as to increase the potential of the detector potentiometer;

the first relay (15) and the second relay (16) are respectively connected with a diode protection circuit (19) in parallel, and the diode protection circuit (19) is provided with an indicator lamp (20).

10. The automatic tracking and centering device for the X-ray detector and the bulb tube according to claim 9, further comprising a first fast recovery diode (17) and a second fast recovery diode (18);

one end of the first fast recovery diode (17) is electrically connected with the detector potentiometer, and the other end of the first fast recovery diode (17) is connected between the second operational amplifier (11) and the first triode (13);

one end of the second fast recovery diode (18) is electrically connected with the detector potentiometer, and the other end of the second fast recovery diode (18) is connected between the third operational amplifier (12) and the second triode (14).

Technical Field

The invention belongs to the technical field of X-ray equipment, and particularly relates to an automatic tracking and centering device for an X-ray detector and a bulb tube.

Background

An X-ray detector can convert X-ray energy into an electrical signal that can be recorded by receiving radiation exposure and then generating an electrical signal proportional to the radiation intensity. Generally, the intensity of the radiation signals received by the detector depends on the density of tissues in the human body section of the part, the tissues with high density, such as bones, absorb more X-rays, and the signals received by the detector are weaker; less dense tissue, such as fat, absorbs less X-rays and the detector obtains a stronger signal.

At present, during the shooting process of an X-ray detector, the centering of X-rays can ensure the shooting quality while reducing the irradiation quantity. At the present stage, many existing devices in hospitals do not have an automatic centering function, and can be performed only by cooperation of a doctor and a patient, so that the problems are troublesome, the labor intensity of medical staff is high, time is delayed, the alignment precision is difficult to guarantee, the X-ray irradiation amount is difficult to control to be the lowest, and further the harm to the patient cannot be reduced to the lowest degree. How to realize the automatic tracking and centering of the X-ray detector and the bulb tube so as to reduce the X-ray irradiation to the patient on the premise of ensuring the alignment precision is a technical problem worthy of solving.

Disclosure of Invention

Therefore, the invention provides an automatic tracking and centering device for an X-ray detector and a bulb tube, which solves the problems that the traditional manual centering can not ensure the alignment precision and reduce the X-ray shooting irradiation amount to a patient as much as possible.

In order to achieve the above purpose, the invention provides the following technical scheme: an automatic tracking and centering device for an X-ray detector and a bulb tube comprises a detector end motor, a detector end potentiometer and a bulb tube end potentiometer;

the detector end potentiometer is provided with a first preset position, the bulb end potentiometer is provided with a second preset position, and when the detector end potentiometer is located at the first preset position and the bulb end potentiometer is located at the second preset position, the potentials of the detector end potentiometer and the bulb end potentiometer are equal;

when the electric phases of the detector end potentiometer and the bulb tube end potentiometer are equal, the focus of an X-ray tube of the X-ray detector is in a centering state;

when the resistance of the bulb-end potentiometer changes, the resistance value of the detector-end potentiometer is changed through the detector-end motor, and when the potentials of the detector-end potentiometer and the bulb-end potentiometer are equal again, the detector-end motor stops driving, so that the focus of the X-ray tube of the X-ray detector is in a centering state again.

As a preferred scheme of the automatic tracking and centering device of the X-ray detector and the bulb tube, the detector end potentiometer is fixed at the top end of a detector fixing upright post of the X-ray detector;

the bulb tube end potentiometer is fixed at the top end of a bulb tube fixing upright post of the X-ray detector;

the resistance values of the detector end potentiometer and the bulb end potentiometer are changed in a wire pulling mode.

The automatic tracking and centering device for the X-ray detector and the bulb tube further comprises a first operational amplifier, wherein a first input end of the first operational amplifier is electrically connected with the detector-end potentiometer, and a second input end of the first operational amplifier is electrically connected with the bulb-end potentiometer.

As a preferred scheme of the automatic tracking and centering device for the X-ray detector and the bulb tube, a plurality of detector end filter resistors are connected in series between the first input end of the first operational amplifier and the detector end potentiometer;

a detector end filter capacitor is electrically connected between the detector end filter resistor and the detector end potentiometer;

a plurality of bulb tube end filter resistors are connected in series between the second input end of the first operational amplifier and the bulb tube end potentiometer;

a bulb end filter capacitor is electrically connected between the bulb end filter resistor and the bulb end potentiometer;

and a feedback resistor and a feedback capacitor are connected in parallel between the second input end and the output end of the first operational amplifier.

The automatic tracking and centering device for the X-ray detector and the bulb tube further comprises a second operational amplifier, wherein the output end of the first operational amplifier is electrically connected with the first input end of the second operational amplifier, and the second input end of the second operational amplifier is electrically connected with a detector-end potentiometer.

The automatic tracking and centering device for the X-ray detector and the bulb tube further comprises a third operational amplifier, wherein the output end of the first operational amplifier is electrically connected with the first input end of the third operational amplifier, and the second input end of the third operational amplifier is electrically connected with a detector-end potentiometer.

As a preferred scheme of the automatic tracking and centering device for the X-ray detector and the bulb tube, a plurality of voltage dividing resistors are connected in series between the output end of the first operational amplifier and the first input end of the second operational amplifier;

a plurality of divider resistors are connected in series between the second input end of the second operational amplifier and the end potentiometer of the detector;

a plurality of divider resistors are connected in series between the output end of the first operational amplifier and the first input end of the third operational amplifier;

and a plurality of divider resistors are connected in series between the second input end of the third operational amplifier and the end potentiometer of the detector.

The automatic tracking and centering device for the X-ray detector and the bulb tube further comprises a first triode and a second triode;

the output end of the second operational amplifier is electrically connected with the base level of the first triode, and the emitter level of the first triode is electrically connected with the end potential device of the detector;

the output end of the third operational amplifier is electrically connected with the base level of the second triode, and the emitter level of the second triode is electrically connected with the end potential device of the detector.

As a preferred scheme of the automatic tracking and centering device of the X-ray detector and the bulb tube, the device also comprises a first relay and a second relay;

the collector of the first triode is electrically connected with the first relay, and the first relay is used for controlling the movement of the end motor of the detector to reduce the potential of the potentiometer of the detector;

the collector level of the second triode is electrically connected with the second relay, and the second relay is used for controlling the movement of the end motor of the detector to increase the potential of the potentiometer of the detector;

the first relay and the second relay are respectively connected with a diode protection circuit in parallel, and the diode protection circuit is provided with an indicator lamp.

The automatic tracking and centering device for the X-ray detector and the bulb tube further comprises a first fast recovery diode and a second fast recovery diode;

one end of the first fast recovery diode is electrically connected with the detector potentiometer, and the other end of the first fast recovery diode is connected between the second operational amplifier and the first triode;

one end of the second fast recovery diode is electrically connected with the detector potentiometer, and the other end of the second fast recovery diode is connected between the third operational amplifier and the second triode.

The invention has the following advantages: the device is provided with a detector end motor, a detector end potentiometer and a bulb tube end potentiometer; the detector end potentiometer is provided with a first preset position, the bulb end potentiometer is provided with a second preset position, and when the detector end potentiometer is located at the first preset position and the bulb end potentiometer is located at the second preset position, the potentials of the detector end potentiometer and the bulb end potentiometer are equal; when the electric phases of the detector end potentiometer and the bulb end potentiometer are equal, the focus of an X-ray tube of the X-ray detector is in a centering state; when the resistance of the bulb end potentiometer changes, the resistance value of the detector end potentiometer is changed through the detector end motor, when the potentials of the detector end potentiometer and the bulb end potentiometer are equal again, the detector end motor stops driving, and the focus of the X-ray tube of the X-ray detector is in a centering state again. The invention can realize the automatic tracking and centering of the X-ray detector and the bulb tube, reduce the labor intensity of medical personnel, improve the alignment precision, reduce the irradiation quantity, reduce the radiation injury of patients and reduce the updating cost of equipment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

FIG. 1 is a schematic diagram of an apparatus for automatically tracking and centering an X-ray detector and a bulb according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a detector end motor connection of the automatic tracking and centering device for the X-ray detector and the bulb provided in the embodiment of the present invention.

In the figure, 1, a detector end motor; 2. a detector end potentiometer; 3. a bulb-end potentiometer; 4. a first operational amplifier; 5. a detector end filter resistor; 6. a detector end filter capacitor; 7. a ball tube end filter resistor; 8. a ball tube end filter capacitor; 9. a feedback resistor; 10. a feedback capacitance; 11. a second operational amplifier; 12. a third operational amplifier; 13. a first triode; 14. a second triode; 15. a first relay; 16. a second relay; 17. a first fast recovery diode; 18. a second fast recovery diode; 19. a diode protection circuit; 20. and an indicator light.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 2, an automatic tracking and centering device for an X-ray detector and a bulb is provided, which includes a detector end motor 1, a detector end potentiometer 2 and a bulb end potentiometer 3;

the detector-end potentiometer 2 is provided with a first preset position, the bulb-end potentiometer 3 is provided with a second preset position, and when the detector-end potentiometer 2 is located at the first preset position and the bulb-end potentiometer 3 is located at the second preset position, the potentials of the detector-end potentiometer 2 and the bulb-end potentiometer 3 are equal;

when the electric phases of the detector end potentiometer 2 and the bulb end potentiometer 3 are equal, the focus of an X-ray tube of the X-ray detector is in a centering state;

when the resistance of the bulb end potentiometer 3 changes, the resistance value of the detector end potentiometer 2 is changed through the detector end motor 1, and when the potentials of the detector end potentiometer 2 and the bulb end potentiometer 3 are equal again, the detector end motor 1 stops driving, so that the focus of the X-ray tube of the X-ray detector is in a centering state again.

In this embodiment, the detector end potentiometer 2 is fixed at the top end of a detector fixing upright of the X-ray detector;

the bulb tube end potentiometer 3 is fixed at the top end of a bulb tube fixing upright post of the X-ray detector;

the resistance values of the detector end potentiometer 2 and the bulb end potentiometer 3 are changed in a wire pulling mode.

Specifically, a core idea of the present invention is to perform resistance configuration with variable resistance values at both the detector end and the bulb end of the X-ray detector, that is, the detector end potentiometer 2 and the bulb end potentiometer 3, in an initial state, the potentials of the detector end potentiometer 2 and the bulb end potentiometer 3 are equal, and the focus of the X-ray tube of the X-ray detector is in a centered state. And when the bulb moves, the resistance value of the bulb end potentiometer 3 changes at the moment, the potential corresponding to the bulb end potentiometer 3 changes, based on the change, the resistance value of the detector end potentiometer 2 is controlled to change through the detector end motor 1, so that the potential corresponding to the detector end potentiometer 2 changes, when the potentials of the detector end potentiometer 2 and the bulb end potentiometer 3 are equal again, the detector end motor 1 stops driving, and the focus of the X-ray tube of the X-ray detector is in a centering state again.

Specifically, the potentiometer adopts a pull wire mode, mechanical displacement is converted into resistance or voltage output in a linear or any function relation with the mechanical displacement through a potentiometer element, and the resistance of the moving end of the potentiometer is changed due to the displacement of an object. The amount of change in resistance reflects the magnitude of the displacement, and an increase or decrease in resistance indicates the direction of the displacement.

In this embodiment, the optical fiber sensor further includes a first operational amplifier 4, a first input end of the first operational amplifier 4 is electrically connected to the detector-end potentiometer 2, and a second input end of the first operational amplifier 4 is electrically connected to the bulb-end potentiometer 3.

Specifically, a plurality of detector end filter resistors 5 are connected in series between the first input end of the first operational amplifier 4 and the detector end potentiometer 2;

a detector end filter capacitor 6 is electrically connected between the detector end filter resistor 5 and the detector end potentiometer 2;

a plurality of bulb-end filter resistors 7 are connected in series between the second input end of the first operational amplifier 4 and the bulb-end potentiometer 3;

a bulb end filter capacitor 8 is electrically connected between the bulb end filter resistor 7 and the bulb end potentiometer 3;

a feedback resistor 9 and a feedback capacitor 10 are connected in parallel between the second input end and the output end of the first operational amplifier 4.

Specifically, the detector-side filter resistor 5 and the detector-side filter capacitor 6 play a role in filtering and buffering, and the feedback resistor 9, the feedback capacitor 10 and the first operational amplifier 4 form an integrating circuit, which is used as a component of the integrating circuit to play a role in feedback.

In this embodiment, the detection circuit further includes a second operational amplifier 11, an output end of the first operational amplifier 4 is electrically connected to a first input end of the second operational amplifier 11, and a second input end of the second operational amplifier 11 is electrically connected to the detector-end potentiometer 2. The detector further comprises a third operational amplifier 12, wherein the output end of the first operational amplifier 4 is electrically connected with the first input end of the third operational amplifier 12, and the second input end of the third operational amplifier 12 is electrically connected with the detector-end potentiometer 2. A plurality of voltage dividing resistors are connected in series between the output end of the first operational amplifier 4 and the first input end of the second operational amplifier 11; a plurality of divider resistors are connected in series between the second input end of the second operational amplifier 11 and the detector end potentiometer 2; a plurality of voltage dividing resistors are connected in series between the output end of the first operational amplifier 4 and the first input end of the third operational amplifier 12; a plurality of divider resistors are connected in series between the second input end of the third operational amplifier 12 and the detector end potentiometer 2.

In this embodiment, the device further includes a first transistor 13 and a second transistor 14; the output end of the second operational amplifier 11 is electrically connected with the base stage of the first triode 13, and the emitter stage of the first triode 13 is electrically connected with the detector-end potential device 2; the output end of the third operational amplifier 12 is electrically connected to the base stage of the second triode 14, and the emitter stage of the second triode 14 is electrically connected to the detector-end potential device 2.

In the present embodiment, a first relay 15 and a second relay 16 are further included; the collector of the first triode 13 is electrically connected with the first relay 15, and the first relay 15 is used for controlling the movement of the detector end motor 1 to reduce the potential of the detector potentiometer; the collector of the second triode 14 is electrically connected with the second relay 16, and the second relay 16 is used for controlling the movement of the detector end motor 1 to increase the potential of the detector potentiometer; the first relay 15 and the second relay 16 are respectively connected in parallel with a diode protection circuit 19, the diode protection circuit 19 is provided with an indicator light 20, and the diode protection circuit and the indicator light play a role in circuit protection and indication.

In this embodiment, a first fast recovery diode 17 and a second fast recovery diode 18 are further included; one end of the first fast recovery diode 17 is electrically connected with the detector potentiometer, and the other end of the first fast recovery diode 17 is connected between the second operational amplifier 11 and the first triode 13; one end of the second fast recovery diode 18 is electrically connected to the detector potentiometer, and the other end of the second fast recovery diode 18 is connected between the third operational amplifier 12 and the second transistor 14.

Specifically, the fast recovery diode is a semiconductor diode with the characteristics of good switching characteristic and short reverse recovery time, can be applied to electronic circuits such as a switching power supply, a PWM (pulse width modulation) and a frequency converter, and can be used as a high-frequency rectifier diode, a freewheeling diode or a damping diode.

Specifically, the principle of realizing the automatic tracking and centering of the X-ray detector and the bulb tube is as follows:

firstly, signal generation, generation and amplification of feedback signals:

when a doctor manually moves a bulb of the X-ray detector downwards according to the height of a patient, the voltage of the output end of the bulb end potentiometer 3 is reduced and is transmitted to a first input end pin of the first operational amplifier 4, and when the voltage of the first input end pin of the first operational amplifier 4 is lower than that of a second input end pin of the first operational amplifier 4, a negative voltage is generated;

similarly, when the doctor manually moves the bulb of the X-ray detector upwards according to the height of the patient, the voltage at the output end of the bulb end potentiometer 3 is increased and transmitted to the first input end pin of the first operational amplifier 4, and when the voltage at the first input end pin of the first operational amplifier 4 is higher than the voltage at the second input end pin of the first operational amplifier 4, a positive voltage is generated;

secondly, the action of the detector end motor 1 is realized:

if the first operational amplifier 4 generates a negative voltage, the negative voltage signal is transmitted to the first input terminal pin of the second operational amplifier 11, the first input terminal pin is a reverse input terminal, and the second input terminal pin is a same-direction input terminal after being compared with the second input terminal pin of the second operational amplifier 11, the output terminal of the second operational amplifier 11 generates a positive voltage to push the first triode 13 to be conducted, after the first triode 13 is conducted, the first relay 15 works, the detector end motor 1 can drive the detector to move downwards, so that the output potential of the detector end potential device 2 is reduced, and when the potentials of the detector end potential device 2 and the bulb end potential device 3 are equal, the detector end motor 1 stops driving.

If the first operational amplifier 4 generates a positive voltage, the positive voltage signal is transmitted to the first input terminal pin of the third operational amplifier 12, the first input terminal pin is a same-direction input terminal, and the second input terminal pin is a reverse-direction input terminal after being compared with the second input terminal pin of the third operational amplifier 12, the output terminal of the third operational amplifier 12 generates a positive voltage to push the second triode 14 to be conducted, after the second triode 14 is conducted, the second relay 16 works, the detector-side motor 1 can drive the detector to move upwards, so that the output potential of the detector-side potential device 2 is increased, and when the potentials of the detector-side potential device 2 and the bulb-side potential device 3 are equal, the detector-side motor 1 stops driving.

Because the electric phases of the detector end potentiometer 2 and the bulb end potentiometer 3 are equal, the focus of the X-ray tube of the X-ray detector is in a centering state, and real-time centering when a doctor operates the bulb is realized.

In summary, the invention is provided with a detector end motor 1, a detector end potentiometer 2 and a bulb end potentiometer 3; the detector-end potentiometer 2 has a first preset position, the bulb-end potentiometer 3 has a second preset position, and when the detector-end potentiometer 2 is located at the first preset position and the bulb-end potentiometer 3 is located at the second preset position, the potentials of the detector-end potentiometer 2 and the bulb-end potentiometer 3 are equal; when the electric phases of the detector end potentiometer 2 and the bulb tube end potentiometer 3 are equal, the focus of an X-ray tube of the X-ray detector is in a centering state; when the resistance of the bulb end potentiometer 3 changes, the resistance value of the detector end potentiometer 2 is changed through the detector end motor 1, and when the potentials of the detector end potentiometer 2 and the bulb end potentiometer 3 are equal again, the detector end motor 1 stops driving, so that the focus of the X-ray tube of the X-ray detector is in a centering state again. The invention can realize the automatic tracking and centering of the X-ray detector and the bulb tube, reduce the labor intensity of medical personnel, improve the alignment precision, reduce the irradiation quantity, reduce the radiation injury of patients and reduce the updating cost of equipment.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.