CN211611357U

CN211611357U - Multi-source medical electronic linear accelerator

Info

Publication number: CN211611357U
Application number: CN201921506102.5U
Authority: CN
Inventors: 连卫东
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-10-02
Anticipated expiration: 2029-09-11

Abstract

The utility model relates to a multisource medical electron linear accelerator, including two groups of N medical electron linear accelerator accelerating tubes of each group, N is more than or equal to 2 integer, the bottom surface of each accelerating tube is clung to a primary collimator containing a conical hole which takes a ray source as a vertex, the axial lead of the conical hole is intersected in the isocenter, in the two groups of ray sources, one group of ray sources is distributed on a plane, and the plane contains the isocenter and is vertical to the rotating axial lead of the ray source; the other group of ray sources are distributed on the other plane, the plane is perpendicular to the rotating axis of the ray sources and has a certain distance from the isocenter, when viewed from the rotating axis direction of the ray sources, each group of N axis lines are distributed in an equiangular circumference mode, two groups of N axis lines are staggered by a certain angle along the circumference direction, included angles between all two groups of N axis lines are equal, each accelerating tube and a primary collimator tightly attached to the accelerating tube are installed on a headstock, and multi-angle and multi-ray simultaneous irradiation is achieved.

Description

Multi-source medical electronic linear accelerator

Technical Field

The utility model relates to a medical electron linear accelerator taking X-rays as a ray source.

Background

In recent years, flash therapy (flash) has been proposed in the radiotherapy industry, i.e., a flash therapy (flash) is applied to a tumor in an instant, so that the tumor killing effect can be improved, but the damage to normal cells is less, and although the treatment mechanism is still discussed, the flash therapy is not yet applied in clinic, but the flash therapy is a direction to be explored. One of the methods to achieve an instantaneous increase of the tumor dose is to arrange a plurality of radiation sources to irradiate the tumor with a plurality of radiation beams simultaneously from a plurality of directions. When a plurality of ray sources are arranged, the intersection of ray bundles outside a tumor target area is reduced as much as possible, and the irradiation to normal tissues is reduced while the tumor dose is increased. The irradiation dose per unit volume is used to determine the degree of normal tissue injury, and therefore, the radiation source in the spatial multi-point arrangement can be changed in position to change the projection direction of the radiation beam. This patent satisfies the above considerations as much as possible.

SUMMERY OF THE UTILITY MODEL

The utility model provides a medical electron linear accelerator of multisource adopts the ray source multiple spot to arrange, and the many rays of multi-angle shine simultaneously, realizes that the tumour position accepts great dose in the twinkling of an eye.

The utility model adopts the technical proposal that:

a multi-source medical electronic linear accelerator is characterized by comprising

Two groups of N medical electron linear accelerator accelerating tubes (1), wherein N is an integer greater than or equal to 2, the central point of the bottom surface of each accelerating tube (1) is the position of a ray source (1001), the bottom surface of each accelerating tube (1) is tightly attached to a primary collimator (2) which comprises a conical hole taking the ray source (1001) as a vertex, the axial leads (1002) of the N conical holes of the two groups of accelerating tubes intersect at an isocenter (1003), the distances from the ray source (1001) to the isocenter (1003) of each group are equal, the distances from the ray source (1001) to the isocenter (1003) of the two groups of ray sources (1001) can be unequal, and in the two groups of ray sources (1001), one group of ray sources (1001) is distributed on a plane which comprises the isocenter (1003) and is vertical to the rotating axial lead (1004) of the ray source; the other group of ray sources (1001) are distributed on the other plane, the plane is perpendicular to a rotating axis (1004) of the ray sources (1001) and has a certain distance from an isocenter (1003), each group of N axis lines (1002) are distributed in an equiangular circumference mode when viewed from the rotating axis line (1004) direction of the ray sources, two groups of N axis lines (1002) are staggered by a certain angle along the circumferential direction, included angles between all two groups of N axis lines (1002) are equal, and each accelerating tube (1) and a primary collimator (2) tightly attached to the accelerating tube are installed on a headstock (3).

The two groups of N headstock (3) are arranged in a lengthened thick circular ring (4), the axis line (4001) of the thick circular ring is coincided with the rotating axis line (1004) of the ray source, the front and the back of the thick circular ring (4) are respectively connected with two convolution support shafts (5) with coincident axes, the axis line of the convolution support shaft (5) is coincided with the axis line (4001) of the thick circular ring, the outer surface of the convolution support shaft (5) connected with the front surface of the thick circular ring (4) is connected with

convolution support frames

1 and 6, the inner ring of the convolution support shaft (5) connected with the back surface of the thick circular ring (4) is connected with

convolution support frames

2 and 7, the outer ring of the convolution support shaft (5) is connected with the thick circular ring (4), the

convolution support frames

1 and 6 and

convolution support frames

2 and 7 are simultaneously connected with a

base

1 and 8, the

convolution support frames

2 and 7 and the support shaft (5) connected with the back surface of the thick circular ring (4) And is connected with a rotary driving mechanism (9).

The rotary driving mechanism (9) comprises a large belt wheel (91), a belt (92), a small belt wheel (93), a shaft (94), a group of two bearings A (95) with overlapped axes and a bearing seat (96), wherein the large belt wheel (91) is processed at the outer edge of the outer ring of the rotary supporting shaft (5) connected with the rear surface of the thick circular ring (4), the large belt wheel (91) is movably connected with the belt (92), the belt (92) is movably connected with the small belt wheel (93), the small belt wheel (93) is connected with the shaft (94), the shaft (94) is movably connected with the bearing A (95), the bearing A (95) is installed in the bearing seat (96), the bearing seat (96) is connected with the rotary shaft supporting frame 2(7), and the axial leads of the shaft (94) and the bearing A (95) are parallel to the axial lead (4001) of the thick circular ring.

The rotating shaft supporting frame 1(6) is connected with the image positioning system (10), the image positioning system (10) comprises two X-ray machines, each X-ray machine comprises a bulb tube mounting seat (101), a bulb tube (102), an image intensifier mounting seat (103) and an image intensifier (104), wherein the two bulb tube mounting seats (101) are respectively connected with the upper part and the right side of the middle part of the rotating shaft supporting frame 1 (6); each bulb tube mounting seat (101) is connected with one bulb tube (102); the two image intensifier mounting seats (103) are respectively connected with the lower part and the left side of the middle part of the revolving shaft supporting frame 1 (6); each image intensifier mounting seat (103) is connected with an image intensifier (104); the axis of the low-energy X-ray for positioning emitted by each bulb tube (102) is vertically intersected with the axis (4001) of the thick circular ring and passes through the geometric center of the upper surface of the opposite image intensifier (104); the axes of the two spherical tubes (102) emitting X-rays are vertically intersected on the axis (4001) of the thick circular ring.

Another base 2(11) is arranged in front of the base 1(8), a four-axis treatment bed (12) is arranged above the base 2(11), the four-axis treatment bed (12) comprises a Y-direction Z-axis support linear moving mechanism 121, a Z-direction linear moving mechanism (122), an X-direction linear moving mechanism (123), a Y-direction bed plate linear moving mechanism 124 and a treatment bed plate (125) with rectangular grooves processed on two sides, and the Y direction is parallel to the axis line (4001) of the thick circular ring; the X direction is horizontal and vertical to the axis line (4001) of the thick circular ring; the Z direction is vertical, the Y direction Z axis support linear moving mechanism 121, the Z direction linear moving mechanism (122) and the X direction linear moving mechanism (123) all adopt a moving mode of a linear guide rail and a slide block combination, the Y direction bed plate linear moving mechanism 124 comprises a T-shaped support (1241), two long vertical plates (1242) which are parallel to the axis (4001) of a thick circular ring, two groups of a plurality of cam bearing followers (1243) and two groups of a plurality of steel ball rollers (1244), the Y direction Z axis support linear moving mechanism 121 is connected with the upper surface of a base 2(11) and movably connected with the Z direction linear moving mechanism (122), the Z direction linear moving mechanism (122) is movably connected with the X direction linear moving mechanism (123), the X direction linear moving mechanism (123) is movably connected with the Y direction bed plate linear moving mechanism 124, in the Y direction bed plate linear moving mechanism 124, two long vertical plates (1242) are connected with two sides of the upper surface of the horizontal plane of the T-shaped support (1241), and are respectively connected with two groups of a plurality of cam bearing followers (1243) and two groups of a plurality of steel ball idler wheels (1244), the two groups of a plurality of cam bearing followers (1243) and the two groups of a plurality of steel ball idler wheels (1244) are arranged at intervals, the idler wheel parts of the two groups of a plurality of cam bearing followers (1243) are inserted into the grooves at the two sides of the therapeutic bed board (125) from the two sides of the therapeutic bed board (125), the bulb parts of two groups of a plurality of steel ball rollers (1244) are respectively propped against the two sides of the treatment bed board (125), and the Z-direction linear moving mechanism (122), the X-direction linear moving mechanism (123), the Y-direction bed board linear moving mechanism 124 and the treatment bed board (125) are respectively provided with a linear driving mechanism which can drive the treatment bed board (125) to move along the respective moving direction and is characterized by a screw nut.

The back of the thick circular ring (4) is connected with 2N lead cylinders (13) with different lengths,

the upper part of the back bottom plate of the rotating shaft support frame 2(7) is connected with a reel (14) with 2N winding grooves.

After the above technical scheme is adopted in the utility model, through adopting the ray source multiple spot to arrange, the many rays of multi-angle shine simultaneously, have realized that the tumour position accepts great dose in the twinkling of an eye.

Description of the drawings:

fig. 1 is a schematic structural diagram of the accelerating tube and the ray source of the present invention.

Fig. 2 is a schematic structural diagram of the accelerating tube and the primary collimator of the present invention.

Fig. 3 is a schematic structural view of the two groups of N conical rays intersecting at the isocenter.

Fig. 4 is a schematic structural diagram of the acceleration tube, the primary collimator and the ray bundle axis line seen from the direction of the rotation axis line of the ray source in the present invention.

Fig. 5 is a schematic structural diagram of the acceleration tube, the primary collimator and the ray bundle axis line viewed from the direction perpendicular to the rotation axis line of the ray source in the present invention.

Fig. 6 is a schematic diagram of the headstock of the present invention combining the accelerator tube with the primary collimator.

Fig. 7 is a schematic structural view of the middle-thickness ring of the present invention assembling two groups of N headstock together.

Fig. 8 is a schematic structural diagram of the rotating mechanism and the image positioning system of the medium-thickness ring of the present invention.

Fig. 9 is a schematic structural view of the four-axis therapeutic bed of the present invention.

Fig. 10 is a schematic view of the overall structure of the present invention.

The numerical meanings in the drawings illustrate that:

1. two groups of N medical electron linear accelerator accelerating tubes

1001. Ray source located at central point of bottom surface of accelerating tube

1002. Axial line of conical hole with ray source as top on primary collimator

1003. Two groups of focuses of axial leads of conical holes on each group of N primary collimators

1004. Rotation axis of two groups of N ray sources

2. Two groups of N primary collimators

3. Headstock on which each accelerating tube and primary collimator are mounted

4. Two groups of thick rings with N headstock on each group

4001. Axial lead of thick ring

5. Two rotary support shafts with coincident axes connected with front and back surfaces of thick circular ring

6. Swivel spindle support frame 1 connected with front swivel spindle support shaft

7. A rotary shaft support frame 2 connected with the rear rotary support shaft

8. Base 1 connected with two rotary shaft support frames

9. Rotary driving mechanism for driving thick circular ring to rotate

91. One big belt wheel

92. A belt

93. Small belt wheel

94. A shaft

95. A group of two bearings A with coincident axes

96. A bearing seat

10. Image positioning system

101. Two bulb tube mounting seats

102. Two ball tubes

103. Two image intensifier mount pads

104. Two image intensifiers

11. Base 2 of four-axis treatment bed

12. Four-axis therapeutic bed

121. One Y-direction Z-axis support linear moving mechanism

122. One Z-direction linear moving mechanism

123. An X-direction linear moving mechanism

124. Linear moving mechanism for bed plate in Y direction

1241. T-shaped support

1242. Two long vertical plates parallel to the axis of the thick circular ring

1243. Two groups of cam bearing followers with a plurality of groups

1244. Two groups of a plurality of steel ball rollers of each group

125. Treatment bed board with rectangular grooves machined on two sides

13. Wire guide cylinder

14. Reel with a rotatable handle

The specific implementation mode is as follows:

as shown in fig. 1, a multi-source medical electron linear accelerator includes two groups of N accelerating tubes (1) of the medical electron linear accelerator, where N is an integer greater than or equal to 2, and a central point of a bottom surface of each accelerating tube (1) is a position of a radiation source (1001).

As shown in FIG. 2, the bottom surface of each accelerating tube (1) is attached to a primary collimator (2) having a conical aperture with the source (1001) at the apex. The cone aperture confines the radiation emitted by the radiation source (1001) into a cone beam. The lower part of the primary collimator (2) is also provided with a multi-leaf collimator which restrains the cone-shaped ray beam into a required shape, and the multi-leaf collimator does not relate to the description of the principle of the patent and is not mentioned in the patent. As shown in fig. 3, 4 and 5, the axes (1002) of each set of N tapered holes intersect at the isocenter (1003). The axis (1002) of the cone-shaped hole is the axis of the ray bundle. The distances from each group of ray sources (1001) to the isocenter (1003) are equal, the distances from the two groups of ray sources (1001) to the isocenter (1003) can be different, and in the two groups of ray sources (1001), one group of ray sources (1001) are distributed on a plane which contains the isocenter (1003) and is vertical to a rotating axis line (1004) of the ray sources (1001); the other group of ray sources (1001) are distributed on a plane, the plane is perpendicular to a rotating shaft axis (1004) of the ray sources (1001) and has a certain distance from an isocenter (1003), when viewed from the rotating shaft axis (1004) direction of the ray sources, N shaft axes (1002) of each group are distributed in an equiangular circumference manner, and the N shaft axes (1002) of the two groups are staggered by a certain angle along the circumference direction, and the included angles between the N shaft axes (1002) of all the two groups are equal. The two sets of axes (1002) form an angle when viewed perpendicular to the source axis of rotation (1004).

As shown in fig. 6, each accelerating tube (1) and the primary collimator (2) attached thereto are mounted on a head frame (3). As shown in fig. 7, two groups of N headstock (3) are mounted in an elongated thick ring (4) whose axis (4001) coincides with the axis of rotation (1004) of the radiation source (1001). If the accelerator is an S-band accelerator, the accelerating tube (1) is connected with a longer waveguide system, and other electrical parts are also installed, so that the thick circular ring is lengthened to reserve a larger space, and the electrical parts follow the accelerating tube.

As shown in fig. 8, the front and rear surfaces of the thick ring (4) are respectively connected to two revolving support shafts (5) whose axes coincide, the axis of the revolving support shaft (5) coincides with the axis (4001) of the thick ring, and the outer surface of the revolving support shaft (5) connected to the front surface of the thick ring (4) is connected to a revolving shaft support frame (1), (6). The inner ring of the rotary support shaft (5) connected with the rear surface of the thick circular ring (4) is connected with the rotary shaft support frame (2), (7), the outer ring of the rotary support shaft (5) is connected with the thick circular ring (4), and the rotary shaft support frame (1), (6) and the rotary shaft support frame (2), (7) are simultaneously connected with the base (1), (8). The rotary shaft support frame 2(7) and the rotary support shaft (5) connected with the rear surface of the thick circular ring (4) are connected with the rotary drive mechanism (9) at the same time, the rotary drive mechanism (9) comprises a large belt wheel (91), a belt (92), a small belt wheel (93), a shaft (94), a group of two bearings A (95) with overlapped axes and a bearing seat (96), wherein the large belt wheel (91) is processed at the outer edge of the outer ring of the rotary support shaft (5) connected with the rear surface of the thick circular ring (4), the large belt wheel (91) is movably connected with the belt (92), the belt (92) is movably connected with the small belt wheel (93), the small belt wheel (93) is connected with the shaft (94), the shaft (94) is movably connected with the bearing A (95), the bearing A (95) is arranged in the bearing seat (96), and the bearing seat (96) is connected with the rotary shaft support frame 2(7), the axial lines of the shaft (94) and the bearing A (95) are parallel to the axial line (4001) of the thick circular ring. In order to see the detailed structure of the rotary driving mechanism (9), the support frame (2), (7) of the rotary shaft is processed by local planing, and a bearing seat (96) in the rotary driving mechanism (9) is moved away from the left by a certain distance. As each group is provided with N ray sources (1001), when in rotary irradiation, the thick circular ring (4) does not need to rotate in the whole circle, the rotary shaft support frame (1) (6) can be connected with the image positioning system (10) only by rotating 360 DEG/N, the image positioning system (10) comprises two X-ray machines, each X-ray machine comprises a ball tube installation seat (101), a ball tube (102), an image intensifier installation seat (103) and an image intensifier (104), wherein the two ball tube installation seats (101) are respectively connected with the upper part and the middle right side of the rotary shaft support frame (1) (6), each ball tube installation seat (101) is connected with one ball tube (102), the two image intensifier installation seats (103) are respectively connected with the lower part and the middle left side of the rotary shaft support frame (1) (6), each image intensifier installation seat (103) is connected with one image intensifier (104), and the axis of positioning low-energy X-ray emitted by each ball tube (102) is connected with the axis center of the thick circular ring The lines (4001) intersect vertically and pass through the geometric center of the upper surface of the opposing image intensifier (104). The axes of the two spherical tubes (102) emitting X-rays are vertically intersected on the axis (4001) of the thick circular ring. The image positioning system (10) can be installed on the outer side of the rotating shaft support frame (1), (6) or on the inner side of the rotating shaft support frame (1), (6), so the installation direction is not noted. As shown in fig. 9, another base 2(11) is installed in front of the base 1(8), a four-axis treatment couch (12) is installed above the base 2(11), the four-axis treatment couch (12) comprises a Y-direction Z-axis support linear movement mechanism 121, a Z-direction linear movement mechanism (122), an X-direction linear movement mechanism (123), a Y-direction couch plate linear movement mechanism 124 and a treatment couch plate (125) with rectangular grooves formed on both sides, and the Y direction is parallel to the axis line (4001) of the thick circular ring; the X direction is horizontal and vertical to the axis line (4001) of the thick circular ring; the Z direction is vertical, the Y direction Z axis support linear moving mechanism 121, the Z direction linear moving mechanism (122) and the X direction linear moving mechanism (123) all adopt a moving mode of a linear guide rail and a slide block combination, the Y direction bed plate linear moving mechanism 124 comprises a T-shaped support (1241), two long vertical plates (1242) which are parallel to the axis (4001) of a thick circular ring, two groups of a plurality of cam bearing followers (1243) and two groups of a plurality of steel ball rollers (1244), the Y direction Z axis support linear moving mechanism 121 is connected with the upper surface of a base 2(11) and movably connected with the Z direction linear moving mechanism (122), the Z direction linear moving mechanism (122) is movably connected with the X direction linear moving mechanism (123), the X direction linear moving mechanism (123) is movably connected with the Y direction bed plate linear moving mechanism 124, in the Y direction bed plate linear moving mechanism 124, two long vertical plates (1242) are connected with two sides of the upper surface of the horizontal plane of a T-shaped bracket (1241) and respectively connected with two groups of a plurality of cam bearing followers (1243) and two groups of a plurality of steel ball rollers (1244), the two groups of the plurality of cam bearing followers (1243) and the two groups of the plurality of steel ball rollers (1244) are arranged at intervals, the roller parts of the two groups of the plurality of cam bearing followers (1243) are inserted into grooves at two sides of a bed plate (125) from two sides of the bed plate (125), the ball heads of the two groups of the plurality of steel ball rollers (1244) are respectively propped against two sides of the bed plate (125), and a Z-direction linear moving mechanism (122), an X-direction linear moving mechanism (123), a Y-direction linear moving mechanism 124 and a treatment bed plate (125) are respectively provided with linear driving mechanisms which can drive the linear moving mechanisms to move along respective directions and are characterized by screw,

as shown in fig. 10, the back of the thick ring (4) is connected with 2N wire guiding drums (13) with different lengths, and the upper part of the back bottom plate of the rotating shaft supporting frame 2(7) is connected with a winding wheel (14) with 2N winding grooves. Since each accelerating tube (1) is connected with a complex electrical system, and a plurality of groups of power wires and signal wires need to be led out, 2N wire guide drums (13) are arranged, and the lead led out from each wire guide drum (13) is separated in 2N winding grooves on the winding wheel (14).

As shown in fig. 10, the image-guided intensity modulated radiation therapy of a multi-source medical electron linac patent involves the combination of all components as follows:

1. under the drive of a driving mechanism of an X-direction linear moving mechanism (123) in a four-axis treatment bed (12), a treatment bed board (125) is lowered to a certain height, a patient is raised to a certain height after getting on the bed, and then under the drive of the driving mechanism of the treatment bed board (125), the treatment bed board (125) moves for a certain distance along a Y direction, so that a tumor part of the patient is separated from an area covered by a T-shaped bracket (121) in a vertical direction. The treatment bed board is made of carbon fiber, has light specific gravity and strong ray transmission, and the T-shaped bracket is made of steel and has shielding effect on rays.

2. Under the drive of a driving mechanism of a Z-direction linear moving mechanism (122), the treatment bed board (125) moves for a certain distance along the Y direction, so that the tumor enters a coverage area of two bulbs (102) emitting low-energy X-rays for positioning, and then two X-rays are shot simultaneously to obtain related parameters of the tumor position.

3. After the parameters related to the tumor position are obtained, the treatment bed plate (125) drives the tumor to move in three dimensions under the driving of the driving mechanisms of the Z-direction linear moving mechanism (122), the X-direction linear moving mechanism (123) and the Y-direction bed plate linear moving mechanism 124, so that the target center of the tumor is superposed with the isocenter (1002), and the image guiding and positioning are completed.

4. The irradiation was carried out in two ways:

1) multi-angle irradiation

Multi-angle illumination is divided into several cases:

A. 2N angle illumination. 2N radiation sources (1001) irradiate at an initial position or are angularly adjusted according to the specific situation of the tumor.

B. 4N angle illumination. After the irradiation at the angle of 2N is finished, the rotation driving mechanism (9) drives the thick circular ring (4) to rotate for 360 degrees/2N and then the irradiation is carried out again.

C. 6N angle illumination. After the irradiation at the angle of 2N is finished, the rotation driving mechanism (9) drives the thick circular ring (4) to rotate for 360 degrees/3N, then the irradiation is carried out for the second time, and then the irradiation is carried out for the third time after the rotation is carried out for 360 degrees/3N.

And so on. The principle is that the irradiation angle can be increased for smaller tumors; the irradiation angle is reduced for larger tumors to reduce the intersection of the radiation beams outside the tumor target area.

2) Arc discharge irradiation

The radian of the arc is 360 degrees/radian corresponding to the N angle. And determining the arc-drawing speed according to the dose required by tumor irradiation, and finishing irradiation by drawing the arc once.

When the multi-angle irradiation is carried out, the multi-leaf collimator can carry out intensity-modulated irradiation and is generally suitable for tumors with larger volume and more complex shapes; when the arc is drawn for irradiation, the blades of the multi-blade collimator track the shape of the target area of the tumor, the multi-blade collimator is generally suitable for the tumor with smaller volume and simpler shape, and when the arc is drawn for irradiation, the change of the beam-emitting rate of the 2N accelerating tubes can be respectively controlled, so that the arc-drawing intensity-modulated irradiation is realized.

To sum up, the utility model provides a medical electron linear accelerator of multisource adopts the multiple spot cloth source, implements the multi-angle or draws the arc and shine, can realize that the accent under the image guide location is strong and shines.

Claims

1. A multi-source medical electronic linear accelerator is characterized by comprising

2. The multisource medical electronic linear accelerator according to claim 1, wherein the two groups of N headstock (3) are installed in a lengthened thick ring (4), the axis line (4001) of the thick ring is coincident with the rotation axis line (1004) of the ray source, the front and back of the thick ring (4) are respectively connected with two convolution support shafts (5) whose axes are coincident, the axis line of the convolution support shaft (5) is coincident with the axis line (4001) of the thick ring, the outer side of the convolution support shaft (5) connected with the front surface of the thick ring (4) is connected with a convolution support frame 1(6), the inner ring of the convolution support shaft (5) connected with the back surface of the thick ring (4) is connected with a convolution support frame 2(7), the outer ring of the support shaft (5) is connected with the thick ring (4), the convolution support frame 1(6) and the convolution support frame 2(7) are simultaneously connected with a base 1(8), the rotary shaft support frame 2(7) and the rotary support shaft (5) connected with the rear surface of the thick circular ring (4) are simultaneously connected with a rotary driving mechanism (9).

3. The multi-source medical electronic linear accelerator according to claim 2, wherein the rotary driving mechanism (9) comprises a large belt wheel (91), a belt (92), a small belt wheel (93), a shaft (94), a group of two bearings A (95) with coincident axes and a bearing seat (96), the large belt wheel (91) is processed at the outer edge of an outer ring of a rotary supporting shaft (5) connected with the rear surface of a thick circular ring (4), the large belt wheel (91) is movably connected with a belt (92), the belt (92) is movably connected with a small belt wheel (93), the small belt wheel (93) is connected with a shaft (94), the shaft (94) is movably connected with a bearing A (95), the bearing A (95) is installed in a bearing seat (96), the bearing seat (96) is connected with a rotary shaft supporting frame 2(7), and the axial leads of the shaft (94) and the bearing A (95) are parallel to the axial lead (4001) of the thick circular ring.

4. The multi-source medical electronic linear accelerator according to claim 3, wherein the rotation shaft support frame 1(6) is connected with the image positioning system (10), the image positioning system (10) comprises two X-ray machines, each X-ray machine comprises a bulb tube mounting seat (101), a bulb tube (102), an image intensifier mounting seat (103) and an image intensifier (104), wherein the two bulb tube mounting seats (101) are respectively connected with the upper part and the right side of the middle part of the rotation shaft support frame 1 (6); each bulb tube mounting seat (101) is connected with one bulb tube (102); the two image intensifier mounting seats (103) are respectively connected with the lower part and the left side of the middle part of the revolving shaft supporting frame 1 (6); each image intensifier mounting seat (103) is connected with an image intensifier (104); the axis of the low-energy X-ray for positioning emitted by each bulb tube (102) is vertically intersected with the axis (4001) of the thick circular ring and passes through the geometric center of the upper surface of the opposite image intensifier (104); the axes of the two spherical tubes (102) emitting X-rays are vertically intersected on the axis (4001) of the thick circular ring.

5. The multi-source medical electronic linear accelerator according to claim 4, wherein another base 2(11) is installed in front of the base 1(8), a four-axis treatment couch (12) is installed above the base 2(11), the four-axis treatment couch (12) comprises a Y-direction Z-axis support linear moving mechanism 121, a Z-direction linear moving mechanism (122), an X-direction linear moving mechanism (123), a Y-direction bed plate linear moving mechanism 124 and a treatment bed plate (125) with rectangular grooves formed on both sides, and the Y-direction is parallel to the axis line (4001) of the thick circular ring; the X direction is horizontal and vertical to the axis line (4001) of the thick circular ring; the Z direction is vertical, the Y direction Z axis support linear moving mechanism 121, the Z direction linear moving mechanism (122) and the X direction linear moving mechanism (123) all adopt a moving mode of a linear guide rail and a slide block combination, the Y direction bed plate linear moving mechanism 124 comprises a T-shaped support (1241), two long vertical plates (1242) which are parallel to the axis (4001) of a thick circular ring, two groups of a plurality of cam bearing followers (1243) and two groups of a plurality of steel ball rollers (1244), the Y direction Z axis support linear moving mechanism 121 is connected with the upper surface of a base 2(11) and movably connected with the Z direction linear moving mechanism (122), the Z direction linear moving mechanism (122) is movably connected with the X direction linear moving mechanism (123), the X direction linear moving mechanism (123) is movably connected with the Y direction bed plate linear moving mechanism 124, in the Y direction bed plate linear moving mechanism 124, two long vertical plates (1242) are connected with two sides of the upper surface of the horizontal plane of the T-shaped support (1241) and respectively connected with two groups of a plurality of cam bearing followers (1243) and two groups of a plurality of steel ball rollers (1244),

the two groups of cam bearing followers (1243) and the two groups of steel ball rollers (1244) are arranged at intervals, the roller parts of the two groups of cam bearing followers (1243) are inserted into grooves at two sides of the treatment bed plate (125) from two sides of the treatment bed plate (125), the ball head parts of the two groups of steel ball rollers (1244) are propped against two sides of the treatment bed plate (125), and the Z-direction linear moving mechanism (122), the X-direction linear moving mechanism (123), the Y-direction bed plate linear moving mechanism 124 and the treatment bed plate (125) are respectively provided with linear driving mechanisms which can drive the steel ball rollers to move along respective moving directions and are characterized by screw nuts.

6. The multi-source medical electron linear accelerator according to claim 5, wherein the back of the thick ring (4) is connected with 2N lead cylinders (13) with different lengths.

7. The multi-source medical electronic linear accelerator according to claim 6, wherein a reel (14) having 2N winding grooves is connected to the upper portion of the back bottom plate of the rotating shaft support frame (2), (7).