CN201142237Y - Collimator Adjustment System - Google Patents

Abstract

The utility model discloses a collimator adjustment system, comprising: a collimator, which includes a collimation slit extending substantially horizontally along its longitudinal direction; a first adjustment device, which is connected to one end of the collimator along its longitudinal direction , and can move vertically along a direction approximately perpendicular to the collimating slit; and a second adjusting device, which is connected to the other end of the collimator along its longitudinal direction, and can move vertically along a direction approximately perpendicular to the collimating slit . By adopting the above technical solution, the automatic adjustment of the position of the collimator is realized, thereby avoiding the cumbersome and difficult manual adjustment. In addition, since two independent adjustment devices are provided, not only the adjustment of the upper and lower positions of the collimator can be realized, but also the tilt adjustment of the position of the collimator can be realized. Thus, the adjustment process can be simplified, and the ideal position of the collimation slit of the collimator can be determined quickly and accurately.

Description

Collimator Adjustment System

technical field

The utility model relates to radiation imaging detection technology, in particular to a collimator adjustment system. More specifically, the utility model relates to an automatic adjustment system of a collimator.

Background technique

In order to improve the quality of radiation imaging, a collimator device is usually used to focus the ray source. The quality of the focus depends on the control of the alignment position of the collimation slit in the collimator device and the shielding effect on redundant rays. Most of the existing collimator devices that use ray sources to safely detect objects use manual adjustment mechanisms to adjust the position of the collimation slit. Because the radiation is harmful to the human body, the collimator device is usually installed in a shielding box. In this way, when the collimator device is adjusted, the shielding box needs to be opened, so that the operation of adjusting the collimator device becomes easier. cumbersome and difficult. Usually, people can only manually adjust the position of the collimator in the shielding box during adjustment, and then further control the position of the collimator according to the image formed on the detector, thus requiring multiple adjustments. This manual adjustment method is relatively complicated and time-consuming, and due to the limitation of manual adjustment accuracy and operation mode, it is difficult to quickly and accurately determine the ideal collimation slit position of the collimator device.

Utility model content

In view of this, the purpose of this utility model is to solve at least one aspect of the above-mentioned problems and defects existing in the prior art.

Correspondingly, the object of the present invention is to provide a collimator system, which ensures the requirement of imaging focus and makes the adjustment and control of the collimator easier and more efficient.

According to one aspect of the present utility model, it provides a kind of collimator adjustment system, comprising:

a collimator comprising collimating slots extending substantially horizontally along its longitudinal direction;

a first adjustment device connected to one end of the collimator along its longitudinal direction and vertically movable in a direction substantially perpendicular to the collimation slit; and

A second adjusting device connected to the other end of the collimator in its longitudinal direction and vertically movable in a direction substantially perpendicular to the collimating slit.

In one embodiment, the collimator adjustment system further includes: a shielding box, the shielding box is arranged outside the collimator to basically cover the collimator, and has a The collimating slit of the device is aligned with the opening.

In a further embodiment, each of the first and second adjusting devices includes: a transmission device connected to the collimator to drive the collimator to move vertically; and a driving device , the driving device is used to drive the transmission device.

Preferably, the transmission device includes at least one of a screw nut transmission mode, a synchronous belt transmission mode, a gear transmission mode and a rack and pinion transmission mode.

Preferably, the driving device is a stepping motor or a servo motor.

In one embodiment, the transmission device includes: a nut, the nut is connected with the collimator; a screw matched with the nut, the screw is connected with a driving motor to drive the screw to rotate, wherein: when When the driving motor drives the screw to rotate, the nut matched with the screw generates vertical motion to drive the collimator to move vertically.

Further, the transmission device further includes a pivot unit, which includes: a first connecting piece extending from the end of the nut; a second connecting piece fastened to the collimator; and a pin shaft, The pin shaft passes through the first and second connecting parts, so that the first and second connecting parts can rotate around the pin shaft within a predetermined angle range.

Still further, the first connecting piece is a rod extending from the end of the nut; and the second connecting piece is a U-shaped seat tightly connected with the collimator, and the rod The pin is accommodated in the cavity of the U-shaped seat, and the pin shaft passes through the rod and the U-shaped seat, so that the rod and the U-shaped seat can rotate around the pin within a predetermined angle range.

Advantageously, the nut forms a sliding connection with the shielding box through a bush provided on the shielding box, so that the nut can produce a sliding movement in a vertical direction relative to the shielding box.

Preferably, the adjustment accuracy of the transmission device is between 0.01 mm and 1 mm, and the adjustment accuracy of the transmission device is 0.05 mm. In one embodiment, the adjustment accuracy of the nut and screw transmission is 0.05mm.

In one embodiment, the collimator adjustment system further includes: a top position sensor arranged on the shielding box for detecting and limiting the top position of the collimator; and a top position sensor arranged on the shielding box for A bottom position sensor that detects and limits the bottom position of the collimator.

Preferably, each of the top end position sensor and the bottom end position sensor is a proximity switch or a micro switch.

Preferably, the collimator adjustment system further includes: a controller, which is used to control the movement of the first and second adjustment devices in response to an operator's input or a computer instruction, so as to adjust the position of the collimator.

In one embodiment, the collimator is further provided with a baffle, and when the baffle on the collimator triggers one of the top position sensor or the bottom position sensor, the control The controller controls the first and second adjusting devices to stop their movement, thereby stopping the movement of the collimator.

Further, the collimator adjustment system also includes a biasing device, which is arranged on the shielding box and is used to apply a biasing force to the collimator, so as to ensure the adjustment accuracy between the screw rod and the nut .

Advantageously, the biasing device includes: a spring connected to the shielding box; a connecting plate integrally formed with the collimator or extending from the collimator; The plunger between them, wherein the spring applies a biasing force to the collimator through the plunger.

By adopting the technical scheme of the utility model, since it realizes the automatic adjustment of the position of the collimator through the first and second adjustment devices, it does not need to manually open the shielding device, thereby eliminating the cumbersome and difficult manual adjustment.

In addition, since two independent adjustment devices are provided, not only the adjustment of the upper and lower positions of the collimator can be realized, but also the tilt adjustment of the position of the collimator can be realized.

In addition, the position of the collimation slit of the collimator is controlled and adjusted by a transmission device, such as a stepping motor, so that the adjustment process can be simplified, and the ideal position of the collimation slit of the collimator can be quickly and accurately determined.

Description of drawings

Fig. 1 is a schematic structural diagram of a collimator system according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line A-A in Fig. 1 .

3 is a schematic diagram showing the principle of the adjustment mode of the collimator system according to the present invention, wherein FIG. 3A is a schematic diagram of the synchronous up and down adjustment of the collimator; FIG. 3B is a schematic diagram of the tilt adjustment of the collimator.

Fig. 4 is a schematic diagram showing the structure of a radiation detection system with a collimator system according to the present invention, wherein Fig. 4A is a front view showing a radiation detection system with a collimator system according to the present invention; Fig. 4B is along the diagram 4A Sectional view taken along line C-C at midline.

FIG. 5 is a flowchart of a method for adjusting a collimator system in an embodiment according to the present invention.

Detailed ways

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals designate the same or similar components. The following descriptions of the embodiments of the utility model with reference to the accompanying drawings are intended to explain the overall utility model concept of the utility model, and should not be construed as a limitation of the utility model.

Referring to FIG. 1 , it shows a schematic diagram of a collimator adjustment system 100 according to an embodiment of the present invention. As shown in Figure 1, the collimator adjustment system 100 includes: a collimator 4, which includes a collimation slit 40 extending substantially horizontally along its longitudinal direction; a first adjustment device 20, the first adjustment device The device is connected to one end (the left end in Fig. 1 ) of the collimator 4 along its longitudinal direction, and can move vertically along the direction substantially perpendicular to the collimation slit 40; and the second adjusting device 30, the The second adjusting device is connected to the other end (the right end in FIG. 1 ) of the collimator 4 along its longitudinal direction, and can move vertically in a direction substantially perpendicular to the collimating slit 40 . It should be noted that, in the above embodiments of the present invention, the positional relationship between the collimator 4 and the first and second adjustment devices 20 and 30 is exemplified by taking the horizontal direction and the vertical direction that are substantially perpendicular to each other as examples. Note, but the horizontal direction and the vertical direction of the utility model are not limiting, and they can be any other suitable directions.

1 and 2, the collimator adjustment system 100 also includes: a shielding box 3, which is arranged outside the collimator 4 to basically cover the collimator 4, and has a shielding box arranged thereon and The opening 50 substantially aligns with the collimating slit 40 of the collimator. By arranging the shielding box 3 outside the collimator 4 , it is possible to effectively reduce the damage caused by the leakage of radiation to the outside during the working process of the collimator adjustment system 100 .

Referring to FIG. 1 and FIG. 2 , the first adjusting device 20 and the second adjusting device 30 according to the present invention have basically the same structure. However, the present invention is not limited thereto, and the first adjusting device 20 and the second adjusting device 30 may also have different structures, as long as they can achieve basically the same function. Each of the first and second adjustment devices 20, 30 includes: a transmission device, the transmission device is connected with the collimator 4 to drive the collimator 4 to move vertically; and a driving device, the driving device means for driving the transmission.

In one embodiment, as shown in FIG. 2 , the transmission device includes a nut 10, the nut is connected with the collimator 4; a screw 11 matched with the nut 10, and the screw 11 is used as a driving device The drive motor is connected to drive the screw rod 11 to rotate, wherein: when the drive motor drives the screw rod 11 to rotate, the nut 10 matched with the screw rod 11 produces vertical motion to drive the vertical motion of the collimator 4 . In one embodiment, the driving motor is a stepping motor 13 . However, the present invention is not limited thereto, and other suitable alternative forms can be adopted, such as servo motors. As shown in FIG. 2 , the output shaft of the stepping motor 13 is connected to the screw 11 through a coupling 12 .

In the above exemplary embodiment, the transmission mechanism adopts the form of a screw 11 and a nut 10 that cooperate with each other to convert the rotational motion of the driving device such as the stepper motor 13 into the linear motion of the nut 10, and then drive the collimator 4 to achieve linear motion , but the utility model is not limited thereto, and there may be various alternatives. For example, the transmission device may also adopt at least one of synchronous belt transmission, gear transmission and rack and pinion transmission. Further, the first and second adjusting devices 20, 30 can adopt the same transmission mode, or can adopt different transmission modes. In order to effectively ensure the adjustment accuracy of the collimator system, the adjustment accuracy of the transmission device is between 0.01mm and 1mm. Preferably, the adjustment accuracy of the transmission device is 0.05 mm. Specifically, in the transmission mode using the screw 11 and the nut 10, the adjustment accuracy of the nut and the screw, that is, the lead, is 0.05 mm. The screw nuts in this embodiment are all made of metal materials such as copper or non-metal materials such as resin materials.

Further, referring to FIG. 1 and FIG. 2 , the transmission device further includes a pivot unit, which includes: a first connecting piece extending from the end of the nut 10 ; a second connecting piece fixedly connected to the collimator 4 and a pin shaft 9, the pin shaft passes through the first and second connecting parts, so that the first and second connecting parts can rotate around the pin shaft 9 within a predetermined angle range.

In one embodiment, as shown in Figures 1 and 2, the first connecting member is a rod 16 extending from the end of the nut 10; and the second connecting member is aligned with the The U-shaped seat 8 fixedly connected to the straight device 4, the U-shaped seat 8 is U-shaped and has a cavity at its center position, the rod 16 is accommodated in the cavity of the U-shaped seat 8, and the pin The shaft 9 runs through the rod 16 and the U-shaped seat 8 so that the rod 16 and the U-shaped seat 8 can rotate around the pin 9 within a predetermined angle range.

Referring to Fig. 1 and Fig. 2, the lower end of the collimator 4 is integrally formed or extended with a connecting plate 4b, and the connecting plate 4b is fastened to the U-shaped seat 8 through a fastening connection, such as bolts and nuts. In one embodiment, the collimator adjustment system 100 further includes a biasing device, which is arranged on the shielding box 3 and used to apply a biasing force to the collimator 4 to ensure that the screw and the adjustment accuracy between the nut. In one embodiment, the biasing device includes: a spring support 5 arranged on the shielding box 3; a spring 6 accommodated in the spring support 5; the upper end of the collimator 4 is integrally formed or extended connecting plate 4 a ; a push rod 7 arranged between the spring 6 and the connecting plate 4 a, wherein the spring 6 exerts a biasing force on the connecting plate 4 a of the collimator 4 through the push rod 7 . By adopting the above structure, since during the adjustment process of the collimator system 100, the biasing device always applies a biasing force to the collimator 4 through, for example, the push rod 7, the gap between the screw rod and the nut can be eliminated, Thereby further ensuring the accuracy of adjustment. Although in the above embodiments, the biasing device applies a biasing force to the collimator 4 by means of a compressed spring, the present invention is not limited thereto, and other alternative ways can be used. For example, a biasing force is applied to the collimator 4 using a tension spring provided on the lower side of the shield box 3 .

Referring to Fig. 1 and Fig. 2, the nut 10 forms a sliding connection with the shielding box 3 by, for example, welding a shaft sleeve 14 arranged on the shielding box 3, so that the nut 10 can be vertically connected to the shielding box 3. Orientation produces sliding motion. Specifically, the nut 10 penetrates the lower side of the shielding box 3, and at the position where the nut 10 penetrates the lower side of the shielding box 3, an axle sleeve 14 is provided, so that the nut 10 is matched with the axle sleeve 14 and can be positioned relative to the axle sleeve 14. Create a sliding motion.

In order to effectively support and fix the collimator system 100, as shown in FIG. The system 100 is independently fixed.

Referring to Fig. 1, the collimator adjustment system also includes: a top position sensor 1a arranged on the shielding box 3 for detecting and limiting the top position of the collimator 4; The bottom end position sensor 1b is used to detect and limit the bottom end position of the collimator 4 . The top position sensor and the bottom position sensor may be proximity switches or micro switches. On the other hand, the collimator 4 is also provided with a baffle 2. During the adjustment process of the collimator system, for example, when the collimator 4 moves upwards along a substantially vertical direction so that the baffle 2 reaches a position substantially in line with the When the tip position sensor 1a is in the positive position, the tip position sensor 1a is triggered. It should be noted that if the top position sensor 1a is a micro switch, it needs to be in physical contact with the blocking piece 2 . Similarly, when the collimator 4 moves upwards in a substantially vertical direction so that the shutter 2 reaches a position substantially opposite to the bottom position sensor 1b, the bottom position sensor 1b is triggered. Similarly, if the bottom position sensor 1b is a micro switch, it needs to be in physical contact with the shutter 2 . In addition, the collimator adjustment system also includes: a controller (not shown in the figure), which is used to control the movement of the first and second adjustment devices 20, 30 in response to the operator's input or computer instructions, and then align the collimator. Adjust the position of the device 4. When the flap 2 on the collimator 4 triggers one of the top position sensor 1a and the bottom position sensor 1b, the controller controls the first and second adjustment devices 20, 30 so that Stop the movement, and then make the collimator 4 stop moving.

The adjustment method of the collimator system according to the present invention will be described below. Since the position of the collimator 4 is adjusted by independent first and second adjusting devices in the utility model, it can realize the following three adjustment modes:

1. Referring to Fig. 3A, the stepper motors of the first and second adjustment devices 20, 30 on the left and right sides of the collimator 4 are synchronous and move in the same direction, and the adjustment of the first and second adjustment devices 20, 30 simultaneously The precision is the same. At this time, the collimator 4 will move up and down the same distance H synchronously and in the same direction, so as to realize the synchronous adjustment of the collimator up and down;

2. The stepping motor of the first adjusting device 20 on the left side of the collimator 4 drives the collimator to move upward or does not move, and the stepping motor of the second adjusting device 30 on the right side of the collimator 4 does not move or drives the collimator The collimator can be adjusted to the right by moving the collimator downward.

3. The stepping motor of the first adjusting device 20 on the left side of the collimator 4 drives the collimator to move downward or does not move, and the stepping motor of the second adjusting device 30 on the right side of the collimator 4 does not move or drives the collimator. Moving the collimator upward for a certain distance such as h can realize the tilt adjustment to the left of the collimator.

In the above-mentioned tilt adjustment method, as shown in FIG. 3B, when the adjustment device on one side of the collimator 4, such as the second adjustment device 30, is higher than the adjustment device on the other side, such as the first adjustment device 20, by a predetermined distance h , because the connection between the collimator 4 and the transmission device such as the U-shaped seat 8 is a fastening method, it has sufficient structural rigidity. At this time, the collimator 4 will generate an active force on the pivot unit to make the pivot The unit produces a predetermined range of rotation, and then the collimator 4 will produce a small horizontal displacement Δ in the horizontal direction. In the present utility model, since the collimator adjustment system 100 includes a pivot unit, it includes: a rod 16 extending from the end of the nut 10; a U-shaped seat fixedly connected to the collimator 4 8; and the pin shaft 9, the pin shaft runs through the rod 16 and the U-shaped seat 8, so that the rod 16 and the U-shaped seat 8 can rotate around the pin 9 in a predetermined angle range, thereby allowing the alignment The straightener 4 undergoes a slight horizontal displacement limited within a predetermined range in the horizontal direction.

Since the utility model is provided with two independent first and second adjustment devices 20, 30, not only the adjustment of the upper and lower positions of the collimator 4 can be realized, but also the tilt adjustment of the position of the collimator 4 can be realized.

Next, a method for adjusting a collimator system according to the present invention will be described. See Figure 5,. In step S1, the collimator 4 is positioned to its initial adjustment position, such as the top position, through the first and second adjustment devices 20, 30, such as driving the stepper motor 13, and the edge of the collimator 4 is determined. The first and second ends A′, B′ in the longitudinal direction and the first and second measurement positions A, B of the detector 110 corresponding to the two ends A′, B′ of the collimator 4 . Specifically, the stepper motor 13 drives the collimator 4 to move upwards, and if the shutter 2 blocks the proximity switch 1a, the proximity switch 1a is triggered, and the proximity switch 1a feeds back a signal to the controller, and the controller controls based on the above-mentioned feedback signal. When the stepper motor 13 stops moving, it indicates that the collimator 4 has reached the top position.

At this point, start the radiation source 120 of the radiation detection system 200, radiation rays such as X-rays and isotope rays are emitted from the target point P of the radiation source, and the radiation beam is collimated by the collimator slit 40 of the collimator 4, and then projected onto detector 110. Referring to FIG. 4B, in step S2, the first position on the detector window plane of the detector 110 corresponding to the first and second ends A', B' of the collimator 4 at the initial adjustment position is acquired 1. Radiation detection data D0 at the second measurement positions A and B.

Next, repeat the synchronous driving of the first and second adjusting devices 20, 30 to drive the collimator 4 to move down the predetermined displacement in the vertical direction to a plurality of subsequent adjustment positions, and at the same time obtain the first and second adjustment devices. A plurality of radiation detection data on the second measurement position A, B until the collimator 4 is positioned to its terminal adjustment position, ie the bottom position. Specifically, when the collimator 4 moves to the bottom position, the proximity switch 1b installed at the bottom of the shielding box 3 is triggered, and the proximity switch 1b feeds back a signal to the controller, and the controller controls the stepper motor 13 to stop moving based on the above-mentioned feedback signal , then it shows that the collimator 4 reaches the bottom position.

Then, compare all the radiation detection data at the first and second measurement positions to respectively determine the first and second maximum detection data at the first and second measurement positions A and B, and at the same time determine the initial adjustment position and the The first and second selection adjustment positions of the collimator corresponding to the first and second maximum detection data among the plurality of subsequent adjustment positions. Specifically, based on the radiation detection data obtained at the first and second measurement positions A and B of the detector 110, two curves of the detector data in the entire journey can be drawn, and the judgment (for example, realized by software) can be determined. The maximum value of point A and point B, because the positions of the first and second ends A' and B' of the collimator 4 along the longitudinal direction correspond to the first and second measurement positions A and B of the detector 110 , the adjustment position of the collimator 4 corresponding to the maximum value of the radiation detection data on the detector 110 can be determined, and the adjustment position of the collimator corresponding to the maximum detection data on the left and right sides is determined as the first, The second selection adjustment position is the ideal adjustment position of the collimator.

Finally, the first and second adjustment means are respectively controlled to position said first and second ends of the collimator to first and second selected adjustment positions respectively. Under the predetermined adjustment accuracy, the adjusted position of the collimator is the ideal position of the collimator.

In one embodiment of the present utility model, the controller may be a microprocessor or a microcomputer, which controls the movement of the first and second adjusting devices 20, 30 in response to the operator's input or computer instructions, and then The position of the collimator 4 is adjusted. For example, the acquired radiation detection data at the first and second measurement positions A and B of the detector 110 are input into a microprocessor or a microcomputer, and the microprocessor or the microcomputer runs software to draw two detectors in the entire journey. The graph of the data, to determine the maximum value of point A and point B, because the position of the first and second ends A' and B' of the collimator 4 along the longitudinal direction and the first and second ends of the detector 110 Corresponding to the two measurement positions A and B, the adjustment position of the collimator 4 corresponding to the maximum value of the radiation detection data on the detector 110 can be determined, and the collimator 4 corresponding to the maximum detection data on the left and right sides can be determined. The adjustment position of the collimator is determined as the first and second selection adjustment positions, that is, the ideal adjustment position of the collimator.

Although, in the above adjustment method, the initial adjustment position is the top position of the collimator, and the terminal adjustment position is the bottom position of the collimator; but the utility model is not limited thereto, the initial The adjustment position may also be the bottom position of the collimator, and the terminal adjustment position may also be the top position of the collimator.

During the adjustment process of the above-mentioned collimator 4 by the adjusting device, the predetermined displacement of each movement of the collimator is between 0.01 mm and 1 mm. Preferably, the predetermined displacement of each movement of the collimator is 0.05mm.

By adopting the above-mentioned method for adjusting the collimator system of the present utility model, the position of the collimation slit of the collimator is controlled and adjusted through a transmission device, such as a stepping motor, so that the adjustment process can be simplified, and the adjustment process can be quickly and accurately accurately determine the ideal position of the collimating slit of the collimator.

While certain embodiments of the present general inventive concept have been shown and described, those of ordinary skill in the art will appreciate that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the present invention The scope of the utility model is defined by the claims and their equivalents.

Claims (18)

1. A collimator adjustment system, comprising: a collimator comprising collimating slots extending substantially horizontally along its longitudinal direction; a first adjustment device connected to one end of the collimator along its longitudinal direction and vertically movable in a direction substantially perpendicular to the collimation slit; and A second adjusting device connected to the other end of the collimator in its longitudinal direction and vertically movable in a direction substantially perpendicular to the collimating slit. 2. The collimator adjustment system according to claim 1, further comprising: and a shielding case disposed outside the collimator to substantially cover the collimator and having an opening disposed thereon aligned with the collimating slit of the collimator. 3. The collimator adjustment system according to claim 2, wherein each of said first and second adjustment means comprises: a transmission device, the transmission device is connected with the collimator to drive the collimator to move vertically; and A driving device, the driving device is used to drive the transmission device. 4 . The collimator adjustment system according to claim 3 , wherein the transmission device comprises at least one of a screw nut transmission mode, a synchronous belt transmission mode, a gear transmission mode and a rack and pinion transmission mode. 5. The collimator adjustment system according to claim 4, characterized in that: The driving device is a stepping motor or a servo motor. 6. The collimator adjustment system according to claim 5, wherein the transmission device comprises: a nut, the nut is connected to the collimator; A screw that matches the nut, the screw is connected to a drive motor to drive the screw to rotate, wherein: When the driving motor drives the screw to rotate, the nut matched with the screw produces vertical motion to drive the collimator to move vertically. 7. The collimator adjustment system according to claim 6, wherein the transmission device further comprises a pivot unit comprising: a first connector extending from the end of the nut; a second connecting member securely connected to the collimator; and A pin shaft, the pin shaft passing through the first and second connecting parts, so that the first and second connecting parts can rotate around the pin shaft within a predetermined angle range. 8. The collimator adjustment system according to claim 7, characterized in that: the first connector is a rod extending from an end of the nut; and The second connecting piece is a U-shaped seat tightly connected with the collimator, The rod is accommodated in the cavity of the U-shaped seat, and the pin shaft passes through the rod and the U-shaped seat, so that the rod and the U-shaped seat can rotate around the pin in a predetermined position. Angle range rotation. 9. The collimator adjustment system according to claim 6, characterized in that: The nut forms a sliding connection with the shielding box through a shaft sleeve provided on the shielding box, so that the nut can produce a sliding movement in a vertical direction relative to the shielding box. 10. The collimator adjustment system according to claim 4, characterized in that: The adjustment accuracy of the transmission device is between 0.01 mm and 1 mm. 11. The collimator adjustment system according to claim 4, characterized in that: The adjustment accuracy of the transmission device is 0.05mm. 12. The collimator adjustment system according to claim 6, characterized in that: The adjustment accuracy of the screw rod and the nut is 0.05mm. 13. The collimator adjustment system according to claim 2, further comprising: a tip position sensor provided on the shield box for detecting and limiting the tip position of the collimator; and A bottom position sensor for detecting and limiting the bottom position of the collimator is arranged on the shielding box. 14. The collimator adjustment system according to claim 1, characterized in that: Each of the top end position sensor and the bottom end position sensor is a proximity switch or a micro switch. 15. The collimator adjustment system according to claim 13, further comprising: The controller is used to control the movement of the first and second adjusting devices in response to the input of the operator or the computer instruction, so as to adjust the position of the collimator. 16. The collimator adjustment system according to claim 15, characterized in that: A baffle is also arranged on the collimator, When the flap on the collimator triggers one of the top position sensor and the bottom position sensor, the controller controls the first and second adjustment devices to stop their movement, thereby making the collimator The device stops moving. 17. The collimator adjustment system according to claim 6, further comprising a biasing device, the biasing device is arranged on the shielding box for applying a biasing force to the collimator, To ensure the adjustment accuracy between the screw and the nut. 18. The collimator adjustment system according to claim 17, wherein said biasing means comprises: a spring connected to the shielding box; a web integral with or extending from the collimator; A push rod arranged between the spring and the connecting plate, wherein the spring applies a biasing force to the collimator through the push rod.

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