CN215900759U

CN215900759U - Pre-collimator, treatment head and radiotherapy equipment

Info

Publication number: CN215900759U
Application number: CN202120366289.4U
Authority: CN
Inventors: 李金升
Original assignee: Our United Corp
Current assignee: Our United Corp
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2022-02-25
Anticipated expiration: 2031-02-09

Abstract

The utility model provides a pre-collimator, a treatment head and radiotherapy equipment, and belongs to the field of medical equipment. The pre-collimator is for a radiation therapy system, the pre-collimator comprising: the pre-collimator comprises a pre-collimator body and a pre-collimating hole formed in the pre-collimator body; the pre-collimation hole is a quadrangular frustum pyramid-shaped through hole, and penetrates through the first surface and the second surface of the pre-collimator body, which are opposite to each other. The bundle of rays that sends by the radiation source can disperse behind the collimation hole in advance of quadrangular frustum of a prism form through-hole structure for the bundle of rays that sends out by collimation hole in advance has great radiation field area, ensures that bundle of rays can cover final collimation hole completely, simultaneously, still does benefit to the volume that reduces the collimation ware in advance.

Description

Pre-collimator, treatment head and radiotherapy equipment

Technical Field

The utility model relates to the field of medical equipment, in particular to a pre-collimator, a treatment head and radiotherapy equipment.

Background

The radiotherapy system is a medical device for treating tumors by utilizing radioactive rays, and comprises a treatment head, wherein the treatment head comprises: the radiation field is matched with the tumor shape of a patient.

The pre-collimator defines the maximum field by preliminary conformation, and in the related art, the pre-collimating hole on the pre-collimator is a circular hole, and the projection at the isocenter is a circle with a diameter size of generally 49.5cm, so that the radiation therapy system forms the maximum field with a size of 40cm × 40cm at the isocenter.

In the process of implementing the utility model, the inventor finds that at least the following problems exist in the related art:

since the maximum adjustment aperture of the final collimation aperture of the multileaf collimator is a square aperture, it is necessary that the diameter of the circular pre-collimation aperture is large enough to ensure that the radiation beam completely covers the final collimation aperture, which however results in a correspondingly large volume of the pre-collimator.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a pre-collimator, a treatment head and a radiotherapy apparatus, which can solve the above technical problems.

Specifically, the method comprises the following technical scheme:

a pre-collimator for a radiation therapy system, the pre-collimator comprising: the pre-collimator comprises a pre-collimator body and a pre-collimating hole formed in the pre-collimator body;

the pre-collimation hole is a quadrangular frustum pyramid-shaped through hole, and penetrates through the first surface and the second surface of the pre-collimator body, wherein the first surface and the second surface are opposite.

In some possible implementations, the first cross-section of the pre-collimation hole and the second cross-section of the pre-collimation hole are both elongated holes;

the size of the first section of the pre-collimation hole is larger than that of the second section of the pre-collimation hole;

wherein the first cross-section of the pre-collimation hole is a cross-section of the pre-collimation hole on the first surface of the pre-collimator body;

the second cross-section of the pre-collimation hole is a cross-section of the pre-collimation hole on the second surface of the pre-collimator body.

In some possible implementations, the pre-collimation aperture projects a field at an isocenter of the radiation therapy system in the shape of a bar;

the length of the short side of the radiation field is 5-15 cm;

the length of the long edge of the radiation field is 30-50 cm;

wherein the short side direction of the radiation field is along the axial direction of the machine frame of the radiotherapy system.

In some possible implementations, the pre-alignment holes are adjustable in size.

In some possible implementations, the short side of the pre-alignment hole is adjustable in size.

In some possible implementations, the pre-collimator body includes: the sliding block comprises a base body with a through hole, a first fixing block, a second fixing block, a first sliding block and a second sliding block;

the first fixing block and the second fixing block are fixed on the first side part opposite to the through hole so as to form two short edges of the pre-alignment straight hole in a matching manner;

the first sliding block and the second sliding block are positioned on the second side part opposite to the through hole so as to form two long edges of the pre-alignment straight hole in a matching mode, and the distance between the first sliding block and the second sliding block is adjustable.

In some possible implementations, guide grooves are disposed on opposite surfaces of the first fixed block and the second fixed block;

the two opposite sides of the first sliding block and the two opposite sides of the second sliding block are respectively embedded into the corresponding guide grooves so as to move along the guide grooves.

In some possible implementations, the pre-collimator further includes: a fixing member configured to be capable of fixing the first slider and the second slider in a moving state.

In some possible implementations, the first slider and the second slider are both driven by a driving mechanism to perform the movement;

the drive mechanism includes: the transmission part is respectively connected with the first sliding block and the second sliding block;

and the driving piece is connected with the driving piece.

In some possible implementations, the transmission means is a screw transmission or a rack and pinion transmission.

In yet another aspect, embodiments of the present invention further provide a treatment head, where the treatment head includes any one of the pre-collimators described above.

In still another aspect, the embodiment of the present invention further provides a radiotherapy apparatus, which includes the treatment head described above.

The technical scheme provided by the embodiment of the utility model has the beneficial effects that at least:

the pre-collimator provided by the embodiment of the utility model comprises: the pre-collimator comprises a pre-collimator body and a pre-collimating hole formed in the pre-collimator body. The relative first surface of pre-collimator body and second surface are run through in advance to the collimation hole, and its structure is quadrangular frustum of a prism form through-hole, like this, the bundle of rays that sends by the radiation source can disperse behind the collimation hole of quadrangular frustum of a prism form through-hole structure in advance for the bundle of rays that is launched out by the collimation hole in advance has great radiation field area, ensures that bundle of rays can cover the final collimation hole completely, simultaneously, still does benefit to the volume that reduces the pre-collimator.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

FIG. 2 is a top view of a pre-collimator according to an embodiment of the present invention;

FIG. 3 is a side view of a pre-collimator provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another pre-collimator according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another pre-collimator according to an embodiment of the present invention;

fig. 6 is a schematic view of a connection relationship between a fixed block and a slider according to an embodiment of the present invention.

The reference numerals denote:

1-a pre-collimator body, wherein,

11-a substrate body, wherein the substrate body,

121-a first fixing block, 122-a second fixing block, 1201-a guide groove,

131-the first slide, 132-the second slide,

2-pre-aligned holes, 21-first section, 22-second section,

3-a fixing part is arranged on the upper surface of the frame,

4-a driving mechanism is arranged on the frame,

41-transmission piece, 42-driving piece.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.

The radiotherapy system is a common tumor treatment device, and the radiotherapy system includes treatment couch, frame and treatment head, and the treatment couch can move along the axis direction of frame, and the treatment head bears in the frame, and the treatment head includes again: the collimator comprises a radiation source, a pre-collimator and a multi-leaf collimator, wherein the pre-collimator and the multi-leaf collimator are sequentially arranged on a path of a ray bundle emitted by the radiation source. The ray bundle emitted by the radiation source is firstly preliminarily conformed through the pre-collimating holes on the pre-collimator and then finally conformed through the final collimating holes on the multi-leaf collimator so as to limit the radiation range of the ray bundle, so that the final irradiation field is matched with the tumor shape of the patient.

In the related art, the pre-collimator hole of the pre-collimator is generally a circular hole, and the projection at the isocenter is generally a circle with a diameter of 49.5 cm. However, since the maximum adjustment aperture of the final collimation aperture of the multi-leaf collimator is a square aperture, it is necessary that the diameter of the circular pre-collimation aperture is large enough to ensure that the radiation beam completely covers the final collimation aperture, which however results in a correspondingly large volume of the pre-collimator.

The isocenter of the radiotherapy system refers to the intersection point of the rotation axis of the collimator body (which can be considered as the center of the irradiation field) and the rotation axis of the gantry. The collimator body refers to the whole body formed by the pre-collimator and the multi-leaf collimator.

The radiation field refers to the boundary of the radiation beam defined by the collimating body and the plane of the radiation beam perpendicular to the central axis of the radiation beam.

The axial direction of the gantry means the axial direction along the central axis of the gantry, wherein the central axis of the gantry is parallel to the central axis of the gantry.

An embodiment of the present invention provides a pre-collimator for a radiation therapy system, as shown in fig. 1-3, the pre-collimator comprising: the pre-collimator comprises a pre-collimator body 1 and a pre-collimating hole 2 formed in the pre-collimator body 1.

Wherein, pre-collimation hole 2 is the frustum of a pyramid form through-hole, and pre-collimation hole 2 runs through relative first surface and the second surface of pre-collimator body 1.

The shape of the pre-collimator body 1 includes, but is not limited to: a circular block, a rectangular block, a pentagonal block, or a block of other geometric shape, as long as it suffices to be properly installed in the treatment head of the radiation therapy system.

The structure of the quadrangular frustum pyramid shaped through hole is shown in fig. 1, which has two sets of inclined inner side surfaces opposite to each other in pairs, so that the size of a first section of the pre-collimating hole 2 on the first surface of the pre-collimator body 1 is different from the size of a second section of the pre-collimating hole 2 on the second surface of the pre-collimator body 1.

The inclination angles of the inclined inner side surfaces of the pre-collimation holes 2 may be the same or different, as long as the sizes of the first cross section and the second cross section of the pre-collimation holes 2 are different, for example, the inclination angles of the four inner side surfaces of the pre-collimation holes 2 may be the same. The cross section of the pre-alignment hole 2 may be rectangular or square.

The first and second surfaces of the pre-collimator body 1, which are oriented according to the cross-sectional dimensions of the pre-collimation aperture 2 at the first and second surfaces of the pre-collimator body 1, refer to the surfaces of the pre-collimator body 1 facing the radiation source and facing the multi-leaf collimator. The surface of the end with the smaller cross-sectional dimension of the pre-collimation hole 2 faces the radiation source, and the surface of the end with the larger cross-sectional dimension of the pre-collimation hole 2 faces the multi-leaf collimator.

The pre-collimation hole 2 provided by the embodiment of the utility model is a quadrangular frustum pyramid through hole, and the arrangement is characterized in that the ray bundle emitted by the radiation source can be diffused after passing through the pre-collimation hole 2 with the quadrangular frustum pyramid through hole structure, so that the ray bundle emitted by the pre-collimation hole 2 has a larger radiation field area, the ray bundle can completely cover the final collimation hole, and meanwhile, the volume of the pre-collimator is favorably reduced.

In some possible implementations, as shown in fig. 1, the first section 21 of the pre-collimation hole 2 and the second section 22 of the pre-collimation hole 2 are both elongated holes; and, the size of the first section 21 of the pre-collimation hole 2 is larger than the size of the second section 22 of the pre-collimation hole 2. Wherein the first section 21 of the pre-collimation hole 2 is a section of the pre-collimation hole 2 on the first surface of the pre-collimator body 1; the second cross-section 22 of the pre-collimator hole 2 is the cross-section of the pre-collimator hole 2 on the second surface of the pre-collimator body 1 (i.e. in use, with the first surface of the pre-collimator facing the multi-leaf collimator and the second surface of the pre-collimator facing the radiation source).

Based on the above, the first cross-section and the second cross-section of the pre-collimation hole 2 can be rectangular or square, as shown in fig. 2, the first cross-section and the second cross-section of the pre-collimation hole 2 are elongated holes (i.e. rectangles), the elongated holes have long sides and short sides with different lengths, that is, the pre-collimation hole 2 has long sides and short sides. Through the structure that pre-collimation hole 2 is arranged in the above manner, the ray bundle emitted by the radiation source can form a rectangular radiation field at the isocenter position after passing through pre-collimation hole 2.

When the pre-collimator provided by the embodiment of the utility model is used in a radiotherapy system, the direction of the short side of the pre-collimating hole 2 is along the axial direction of the rack of the radiotherapy system.

The shape of the radiation field projected by the pre-collimation hole 2 with the cross section of a long-strip-shaped hole at the isocenter of the radiotherapy system is correspondingly rectangular, the radiation field comprises a long side and a short side, and the direction of the short side of the radiation field is along the axial direction of a rack of the radiotherapy system.

In some possible implementations, the short side of the portal is made 5cm-15cm in length, e.g., 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, 11cm, 12cm, 13cm, 14cm, 15cm, etc.; the length of the long side of the radiation field is 30cm-50cm, such as 30cm, 35cm, 40cm, 45cm, 50cm, etc.

For example, the dimensions of the field projected by the pre-collimation aperture 2 at the isocenter of the radiotherapy system are as follows: the short side length of the portal is 8cm or 10cm, and the long side length of the portal is 40 cm.

According to the size of the radiation field, the size of the pre-collimation hole 2 at any distance from the isocenter can be obtained correspondingly, and the size of the first section 21 of the pre-collimation hole 2 and the size of the second section 22 of the pre-collimation hole 2 can be obtained. The size of the radiation field provided by the embodiment of the utility model enables the size of the pre-collimation hole 2 to be correspondingly smaller, is favorable for reducing the size and the volume of the pre-collimator, and is further favorable for simplifying the volume and the structure of the treatment head.

In some possible implementations, the pre-collimation hole 2 of the pre-collimator provided in the embodiments of the present invention is adjustable in size, which includes but is not limited to: the size of the long edge of the pre-collimation hole 2 can be adjusted, or the size of the short edge of the pre-collimation hole 2 can be adjusted, or both the size of the long edge and the size of the short edge of the pre-collimation hole 2 can be adjusted.

The size of the pre-collimation hole 2 is variable, so that different primary shape-conforming effects of ray bundles can be obtained, the pre-collimation hole is suitable for focus areas with different sizes, and the adaptability of the pre-collimator is improved. Further, when the size of the pre-collimation hole 2 is changed to 0, that is, when the pre-collimation hole 2 is closed, the source is turned off or the intensity modulation treatment without the irradiation of the radiation can be performed.

In some possible implementations, the short side of the pre-collimation hole 2 is made adjustable in size, so that in the pre-collimator application state, the size of the pre-collimation hole 2 in the axial direction of the gantry of the radiotherapy system is adjustable to adapt to focal regions of different sizes.

It should be noted that the size of the short side of the pre-alignment hole 2 is adjustable, which means that the size of the short side of any cross section of the pre-alignment hole 2 is adjustable in the whole depth direction of the pre-alignment hole 2.

As to how the short side of the pre-alignment hole 2 is adjustable in size, the following exemplary description is given in the embodiment of the present invention:

in some possible implementations, as shown in fig. 4 or 5, the pre-collimator body 1 comprises: a base body 11 having a through hole, a first fixing block 121, a second fixing block 122, a first slider 131, a second slider 132;

the first fixing block 121 and the second fixing block 122 are fixed on the first side part opposite to the through hole to form two short sides of the pre-alignment straight hole 2 in a matching way;

the first slider 131 and the second slider 132 are located at the opposite second side of the through hole to cooperate with two long sides constituting the pre-alignment straight hole 2, and the distance between the first slider 131 and the second slider 132 is adjustable.

The base 11, the first fixed block 121, the second fixed block 122, the first slider 131, and the second slider 132 are made of a radiation shielding material, such as tungsten, lead, or a tungsten alloy. Also, the shape of the substrate 11 includes, but is not limited to: a circular block, a rectangular block, a pentagonal block, or a block of other geometric shape, as long as it suffices to be properly installed in the treatment head of the radiation therapy system.

By moving the first and

second sliders

131 and 132, the distance between the two sliders can be adjusted, thereby achieving the purpose of adjusting the size of the short side of the pre-alignment hole 2.

For example, the first slider 131 and the second slider 132 can be moved as follows to adjust the distance between them: the first slider 131 and the second slider 132 move by means of sliding guide transmission, the first slider 131 and the second slider 132 move by means of rack and pinion transmission, the first slider 131 and the second slider 132 move by means of screw nut transmission, and the like. These are exemplified in the following, respectively:

as an example, the first and second fixing blocks 121 and 122, and the first and

second sliders

131 and 132 may be respectively positioned at both sides of the top of the through-hole of the base 11, such that the pre-alignment hole 2 formed by each fixing block and each slider is actually positioned above the through-hole of the base 11. In this implementation, the size of the through-hole is made larger than the maximum size to which the pre-collimation hole 2 can be adjusted to ensure that the desired field is obtained.

As another example, the first and second fixing blocks 121 and 122, and the first and

second sliders

131 and 132 may be respectively located at both inner sides of the through-hole of the base 11, so that the pre-alignment hole 2 formed by the fixing blocks and the sliders is actually integrated with the through-hole of the base 11.

In this implementation, the size of the through hole may be adaptively determined according to the sizes of the fixed block and the slider, and the required field size. Wherein, the opposite second side of the through hole of the base body 11 is provided with a sliding slot (the sliding slot is equivalent to a guide slot 1201 described below) for respectively accommodating the tail parts of the first slider 131 and the second slider 132 and enabling the tail parts of the first slider 131 and the second slider 132 to move along the sliding slot, and the front parts of the first slider 131 and the second slider 132 are opposite for constituting the beam conformal region. The structure of the opposite sides of the first and second fixed

blocks

121 and 122 is adapted to the structure of the sides of the first and

second sliders

131 and 132, for example, the opposite sides of the first and second fixed

blocks

121 and 122 are in surface-to-surface contact with the sides of the first slider 131 to move the first and

second sliders

131 and 132 along the surfaces of the sides of the fixed blocks. Alternatively, as shown in fig. 6, guide grooves 1201 are formed on the opposite surfaces of the first fixed block 121 and the second fixed block 122, and the opposite sides of the first slider 131 and the opposite sides of the second slider 132 are respectively inserted into the corresponding guide grooves 1201, so that the first slider 131 and the second slider 132 both move along the guide grooves 1201.

For the above two examples, one of the first slider 131 and the second slider 132 may be fixed and the other may be moved, for example, the second slider 132 may be fixed and the first slider 131 may be moved in a direction away from or close to the second slider 132; alternatively, both the first slider 131 and the second slider 132 may be moved, and the two may be moved toward each other or away from each other.

In order to make the movement of the first slider 131 and the second slider 132 more stable and smooth, in the embodiment of the present invention, as shown in fig. 6, guide grooves 1201 are respectively disposed on the opposite surfaces of the first fixed block 121 and the second fixed block 122, and the opposite sides of the first slider 131 and the opposite sides of the second slider 132 are respectively inserted into the corresponding guide grooves 1201, so that the first slider 131 and the second slider 132 both move along the guide grooves 1201.

Exemplary cross-sectional shapes of the guide slots 1201 include, but are not limited to: rectangular, trapezoidal, circular arc, etc., and accordingly, opposite sides of the first and

second sliders

131 and 132 are also provided with rectangular, trapezoidal, circular arc, etc.

The guide groove 1201 on the fixed block not only can provide a guide effect for the movement of the sliding block, but also can provide a certain limiting effect for the sliding block, and is favorable for improving the stability of the sliding block during movement.

After the first slider 131 and the second slider 132 move to the set position along the guide slot 1201, the first slider 131 and the second slider 132 need to be fixed, and the fixing manner of the sliders includes, but is not limited to, the following:

in some possible implementations, the sliding block is manually fixed, and in this implementation, as shown in fig. 4, the pre-collimator provided in the embodiment of the present invention further includes: and a fixing member 3, the fixing member 3 being configured to fix the first slider 131 and the second slider 132 in a moving state.

When the first and

second sliders

131 and 132 move to the set position, the first and

second sliders

131 and 132 are fixed by the fixing member 3, so that the first and

second sliders

131 and 132 are fixed at the set position. The fixing of the fixing member 3 to the first slider 131 is described below as an example to illustrate the structure of the fixing member 3 (the fixing principle of the fixing member 3 to the second slider 132 is the same as that of the fixing member to the first slider 131, and is not described in detail here):

as an example, the fixing member 3 includes: the pressing plate and the first fixing bolt are rotatably connected with one end of the pressing plate and the top of the first fixing block 121 and/or the top of the second fixing block 122, a first bolt hole is formed in the other end of the pressing plate, a first bolt groove is formed in the top wall of the first sliding block 131, the first bolt groove is long in strip shape, the length of the first bolt groove extends along the moving direction of the first sliding block 131, and the first bolt groove is communicated with the first bolt hole.

After the first sliding block 131 moves to the set position, the first fixing bolt can pass through the first bolt hole to enter the first position of the first bolt groove and is simultaneously in threaded connection with the first bolt hole, so that the pressing plate presses the first sliding block 131, the first sliding block 131 is pressed on the top of the base body 11, and the purpose of fixing the first sliding block 131 is achieved. When the position of the first slider 131 needs to be adjusted, the first fixing bolt is detached, the pressing plate is rotated to prevent the pressing plate from pressing the first slider 131, and after the first slider 131 is moved to a desired position, the pressing plate is rotated in the opposite direction to communicate the first bolt hole on the pressing plate with the second position of the first bolt groove on the first slider 131, so that the first fixing bolt can pass through the first bolt hole to enter the second position of the first bolt groove and be in threaded connection with the first bolt hole at the same time, and the purpose of pressing the first slider 131 is achieved.

As another example, the fixing member 3 includes: a plurality of second bolt grooves arranged side by side are formed in the side wall of the first slider 131 of the second fixing bolt, the second bolt grooves are sequentially arranged along the moving direction of the first slider 131, a second bolt hole is formed in the side wall of the first fixing block 121 or the second fixing block 122, the second bolt hole is long-strip-shaped, and the length of the second bolt hole extends along the moving direction of the first slider 131. The second bolt hole communicates with the second bolt groove, and both can be screwed with the second fixing bolt at the same time.

After the first sliding block 131 moves to the set position, the second fixing bolt can pass through the second bolt hole to enter the second bolt groove, and meanwhile, the second fixing bolt is in threaded connection with the second bolt hole and the second bolt groove, so that the purpose of fixing the first sliding block 131 is achieved.

In some possible implementations, as shown in fig. 5, the first slider 131 and the second slider 132 are both moved by the driving of the driving mechanism 4; wherein, drive mechanism 4 includes: a transmission member 41 connected to the first slider 131 and the second slider 132, respectively; a driving member 42 connected to the transmission member 41.

The first slider 131 and the second slider 132 are respectively provided with one drive mechanism 4, and the first slider 131 and the second slider 132 are respectively controlled individually by the two drive mechanisms 4. In the embodiment of the present invention, the driving mechanism 4 can automatically control the movement process of the first slider 131 and the second slider 132, so that the first slider 131 and the second slider 132 can be automatically fixed at the set position after moving to the set position.

The transmission means 41 is, for example, a screw transmission or a rack-and-pinion transmission, and the following are respectively exemplified:

(1) as shown in fig. 5, when the transmission mode of the transmission member 41 is a spiral transmission, the transmission member 41 is a screw rod, the driving member 42 is a linear motor (micro linear motor), a first end of the screw rod is connected to the tail end of the first slider 131 (the tail end of the first slider 131 is the end of the first slider 131 far away from the second slider 132), and a second end of the screw rod is connected to the linear motor.

The linear motor can drive the screw rod to do linear reciprocating motion, so as to drive the first sliding block 131 to do corresponding linear motion, and the purpose of enabling the first sliding block 131 to do linear reciprocating motion along the central axis direction of the rack is achieved.

The second end of the screw rod can be connected with the linear motor through the rotor with the internal thread, and the first end of the screw rod is fixedly connected with the tail end of the first sliding block 131, so that the rotary motion of the output shaft of the linear motor can be converted into the linear motion of the screw rod along the rotor, and the first sliding block 131 is driven to move linearly.

Or, the screw rod can be directly used as an output shaft of the linear motor, and the screw rod is in threaded connection with the tail end of the first sliding block 131, so that the rotation of the screw rod can be directly converted into the linear motion of the first sliding block 131.

(2) When the transmission mode of the transmission member 41 is a rack and pinion transmission, the transmission member 41 includes: a gear and a rack engaged with each other, and the driving member 42 is a micro motor. Wherein, the rack is fixedly connected with the first sliding block 131, and the gear is coaxially connected with the micro motor.

When the micro motor is started, the gear can be driven to rotate, and then the rack meshed with the gear is driven to do linear motion, so that the moving rack drives the first sliding block 131 to do linear motion.

Since the driving speed of the motor is variable, the moving speed and the moving position of the first slider 131 and the second slider 132 can be precisely controlled, and thus a precise radiation intensity modulation effect can be obtained.

In the embodiment of the disclosure, the motor of the driving mechanism 4 is connected with the controller (for example, a PLC controller), the controller can be connected with an upper computer at the same time, an operator can send a command for adjusting the length of the short side of the pre-alignment hole 2 to the controller by operating the upper computer, and the controller drives the motor to control the movement of the sliding block after receiving the command, so as to achieve the purpose of obtaining the pre-alignment hole 2 with a specific size.

When the radiotherapy system comprising the pre-collimator provided by the embodiment of the utility model is used for tumor treatment, an operator can send a command for adjusting the size of the pre-collimating hole 2 through the upper computer before treatment, and the width of the pre-collimating hole 2 is adjusted to a set width value. Alternatively, the operator may send instructions to adjust the size of the pre-alignment holes 2 in real time during the treatment.

The driving speed of the motor can also be adjusted in real time during the treatment process to accurately control the moving speed and the moving position of the first slider 131 and the second slider 132.

Based on the pre-collimator, the treatment head provided by the embodiment of the utility model has the advantages of small volume, simple structure, low cost, strong adaptability and the like.

Based on the use of the treatment head, the radiotherapy equipment provided by the embodiment of the utility model has the advantages of small volume, simple structure, low cost, strong adaptability and the like.

In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The term "and/or" in the embodiment of the present invention is only one kind of association relationship describing an associated object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. 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.

Claims

1. A pre-collimator for a radiation therapy system, the pre-collimator comprising: the device comprises a pre-collimator body (1) and a pre-collimating hole (2) formed in the pre-collimator body (1);

the pre-collimation hole (2) is a quadrangular frustum pyramid-shaped through hole, and the pre-collimation hole (2) penetrates through a first surface and a second surface which are opposite to each other of the pre-collimator body (1).

2. The pre-collimator according to claim 1, characterized in that the first section (21) of the pre-collimating aperture (2) and the second section (22) of the pre-collimating aperture (2) are both elongated apertures;

the size of the first section (21) of the pre-collimation hole (2) is larger than that of the second section (22) of the pre-collimation hole (2);

wherein the first cross section (21) of the pre-collimation hole (2) is the cross section of the pre-collimation hole (2) on the first surface of the pre-collimator body (1);

the second cross section (22) of the pre-collimation hole (2) is the cross section of the pre-collimation hole (2) on the second surface of the pre-collimator body (1).

3. The pre-collimator according to claim 2, characterized in that the shape of the field projected by the pre-collimator hole (2) at the isocentre of the radiotherapy system is elongated;

the length of the short side of the radiation field is 5-15 cm;

the length of the long edge of the radiation field is 30-50 cm;

4. A pre-collimator according to any of claims 2-3, characterized in that the pre-collimator holes (2) are adjustable in size.

5. The pre-collimator according to claim 4, characterized in that the short side of the pre-collimating aperture (2) is adjustable in size.

6. The pre-collimator according to claim 5, characterized in that the pre-collimator body (1) comprises: the device comprises a base body (11) with a through hole, a first fixing block (121), a second fixing block (122), a first sliding block (131) and a second sliding block (132);

the first fixing block (121) and the second fixing block (122) are fixed on the opposite first side parts of the through hole so as to form two short sides of the pre-alignment straight hole (2) in a matching manner;

the first sliding block (131) and the second sliding block (132) are positioned on the opposite second side part of the through hole to be matched with two long sides of the pre-alignment hole (2), and the distance between the first sliding block (131) and the second sliding block (132) is adjustable.

7. The pre-collimator according to claim 6, characterized in that the opposite surfaces of said first fixed block (121) and said second fixed block (122) are provided with guide grooves (1201);

two opposite sides of the first sliding block (131) and two opposite sides of the second sliding block (132) are respectively embedded into the corresponding guide grooves (1201) to move along the guide grooves (1201).

8. The pre-collimator of claim 7, further comprising: a fixing member (3), the fixing member (3) being configured to be capable of fixing the first slider (131) and the second slider (132) in a moving state.

9. The pre-collimator according to claim 7, characterized in that said first slider (131) and said second slider (132) both perform said movement by means of the drive of a drive mechanism (4);

the drive mechanism (4) comprises: a transmission member (41) connected to the first slider (131) and the second slider (132), respectively;

a drive member (42) connected to the transmission member (41).

10. The pre-collimator according to claim 9, characterized in that the transmission means (41) is a screw transmission or a rack and pinion transmission.

11. A treatment head, characterized in that the treatment head comprises a pre-collimator according to any one of claims 1-10.

12. A radiotherapy apparatus, characterized in that it comprises: the therapy head of claim 11.