CN116899127A - Head radiotherapy equipment with real-time image guidance - Google Patents

Abstract

The invention provides head radiotherapy equipment with real-time image guidance, which comprises a three-degree-of-freedom therapeutic bed, a multi-degree-of-freedom stand and a radiation therapy head arranged in the multi-degree-of-freedom stand, wherein the multi-degree-of-freedom stand comprises a stand base, an outer stand gear ring and an inner stand gear ring which are coaxially arranged on the outer side and the inner side of the stand base, and a semicircular arch for installing the radiation therapy head, the semicircular arch is connected in the inner stand gear ring through a support bearing and is connected to the stand base in a sliding manner through a sliding ring, and two sets of image guidance systems are arranged on the outer stand gear ring. The head radiotherapy equipment with real-time image guidance provided by the invention can realize multi-degree-of-freedom motion on the multi-degree-of-freedom rack through the radiation therapy head, thereby realizing true three-dimensional directional therapy; and the high-definition real-time image guidance can be realized and the treatment precision can be improved through the image guidance system which is coaxial and coplanar with the radiation treatment head in the head radiotherapy equipment with the real-time image guidance.

Description

Head radiotherapy equipment with real-time image guidance

Technical Field

The invention belongs to the technical field of medical appliances, and particularly relates to head radiotherapy equipment with real-time image guidance.

Background

Aiming at the situation of high incidence of brain tumors at present, gamma knife radiation therapy is one of the main technical means for treating the tumors at present, and the principle of the gamma knife radiation therapy is to carry out stereotactic radiation therapy on the tumors under the guidance of images by utilizing the damage/inhibition effect of gamma rays on tumor tissues and the characteristic that tumor cells are more sensitive to radiation than normal cells. Generally, the radiation adopts a rotary focusing mode, so that the normal tissue of the human body is irradiated less, the purposes of killing focus tissues and protecting the normal tissue are achieved, and the radiation has become one of the main means for treating brain malignant tumors.

However, due to the fact that the existing gamma treatment head is huge in size and weight, the collimator is low in field switching speed and cannot move in multiple degrees of freedom on the frame, the existing head gamma knife radiotherapy system cannot achieve full-brain spherical surface treatment, for example, neck spinal tumors and the like cannot be treated, treatment space is severely limited, patient experience is poor during treatment, and true three-dimensional directional treatment cannot be achieved.

In addition, the image guiding system of the existing head gamma knife radiotherapy system can only realize positioning verification before treatment, and cannot realize real-time treatment process monitoring, so that on-line diagnosis and treatment are affected, self-adaptive radiotherapy is difficult to implement, and improvement of treatment precision is restricted.

Disclosure of Invention

The invention aims to solve the defects that the prior gamma treatment head cannot realize true three-dimensional directional treatment due to huge volume and excessive weight, the collimator field switching speed is low and the prior gamma knife radiation treatment system cannot realize real-time treatment due to the fact that the collimator field switching speed cannot move on a rack in multiple degrees, and the image guiding system can only realize positioning verification before treatment and cannot realize real-time treatment process monitoring.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a take real-time image to guide's head radiotherapy equipment, includes three degree of freedom treatment beds, its characterized in that still includes multi freedom frame and set up in radiation therapy head in the multi freedom frame, multi freedom frame include the frame base, coaxial set up in outside and the inboard outer frame ring gear and the interior frame ring gear of frame base and be used for installing the semicircle bow of radiation therapy head, the semicircle bow pass through support bearing connect in the interior frame ring gear and pass through sliding ring sliding connection on the frame base.

The external rack gear ring is provided with two sets of image guiding systems, the outside and the inside of the rack base are respectively provided with a first driving mechanism and a second driving mechanism for driving the external rack gear ring and the internal rack gear ring to rotate around the axis of the rack base, and the second driving mechanism drives the internal rack gear ring to drive the radiation therapy head to rotate around the axis of the rack base.

Further, a first guide rail for guiding the sliding ring to move is arranged on the frame base, and a third driving mechanism for driving the sliding ring to swing along the first guide rail is arranged at the bottom of the sliding ring.

Further, the first guide rail is provided with transmission guide gear teeth for being meshed with the third driving mechanism.

Further, a fourth driving mechanism for driving the radiation therapy head to rotate along the semicircular arch is arranged on the radiation therapy head.

Further, the semicircular arch is provided with internal gear teeth which are used for being meshed and connected with the fourth driving mechanism in a transmission mode and a second guide rail which guides the radiation therapy head.

Further, outer gear teeth for meshing transmission with the first driving mechanism and the second driving mechanism are arranged on the outer edge surfaces of the outer rack gear ring and the inner rack gear ring.

Further, the image guiding system comprises a ray tube and a flat panel detector which are symmetrically arranged in the outer rack gear ring, and the first driving mechanism drives the outer rack gear ring to drive the ray tube and the flat panel detector to rotate around the axis of the outer rack gear ring.

Further, the radiation head comprises a box body, a primary collimating body and a secondary collimating body which are arranged in the box body, a shielding block fixed at the top of the primary collimating body, and a driving device which is arranged at the top of the box body and used for driving the secondary collimating body to rotate;

the primary collimation body is uniformly provided with a plurality of mounting grooves capable of mounting the ray sources and a group of primary collimation holes coaxial with the mounting grooves, the secondary collimation body is provided with a plurality of groups of secondary collimation holes, and the driving device drives the secondary collimation body to rotate so that rays emitted by the ray sources pass through one group of secondary collimation holes and are focused on one point.

Further, the driving device comprises a driving motor arranged on the shielding block and a driving shaft fixedly connected with the secondary collimating body, the shielding block and the primary collimating body are both provided with avoidance holes for the driving shaft to penetrate, the box body is provided with a positioning step surface for positioning the shielding block, the secondary collimating body is provided with a mounting hole for the driving shaft to penetrate and fix, and the driving shaft penetrates through the shielding block and the avoidance holes of the primary collimating body and is fixed in the mounting hole.

Further, bearing mounting surfaces are arranged at two ends of the secondary collimating body, a first rolling bearing is sleeved on the bearing mounting surfaces, the secondary collimating body is rotationally connected with the box body through the first rolling bearing, a second rolling bearing is arranged in the shielding block and the primary collimating avoidance hole, and the driving shaft is rotationally connected with the avoidance hole through the second rolling bearing.

The head radiotherapy equipment with the real-time image guidance and the head radiotherapy equipment with the real-time image guidance provided by the invention have the beneficial effects that: the radiation therapy head can realize multi-degree-of-freedom motion on the multi-degree-of-freedom rack of the head radiotherapy equipment with real-time image guidance, so that the radiation therapy head can perform coplanar and non-coplanar arc-discharge focusing radiation, thereby realizing the whole brain spherical radiation therapy space, being capable of taking into account neck spinal tumor therapy and realizing true three-dimensional directional therapy; and through the coaxial coplanarity image guiding system with the radiation therapy head in the head radiotherapy equipment with real-time image guiding, high-definition real-time image guiding can be realized, namely the image system can collect the tumor target area and treat simultaneously, so that the head radiotherapy equipment with real-time image guiding has higher treatment precision.

In addition, the driving device is used for penetrating through the shielding block and the primary collimation body and directly driving the secondary collimation body to rotate relative to the box body, so that one group of secondary collimation holes in the plurality of groups of secondary collimation holes are communicated with the primary collimation holes on the primary collimation body and are used for the radioactive rays of the radioactive rays source to penetrate out of the box body and focus on one point, the field switching speed of the secondary collimation body can be effectively improved, the field switching speed and the source switching speed can be realized, the whole radiation therapy head is small in size, simple in structure and light in weight, and the radiation therapy head is suitable for performing multi-degree-of-freedom motion on a multi-degree-of-freedom rack of head radiotherapy equipment with real-time image guidance, and further the whole brain spherical surface therapy on head tumors is realized.

Drawings

Fig. 1 is a schematic structural diagram of a head radiotherapy apparatus with real-time image guidance according to a first embodiment of the present invention;

FIG. 2 is a rear view of a head radiotherapy apparatus with live image guidance according to a first embodiment of the present invention;

FIG. 3 is a left side view of a head radiotherapy apparatus with live image guidance according to a first embodiment of the present invention;

FIG. 4 is a front view of a head radiotherapy apparatus with real-time image guidance according to a first embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 2 at A;

FIG. 6 is a cross-sectional view of a radiation therapy head in a head radiotherapy apparatus with real-time image guidance in accordance with the present invention;

FIG. 7 is an isometric view of a radiation therapy head in a head radiotherapy apparatus with real-time image guidance in accordance with the present invention;

FIG. 8 is a schematic diagram of a secondary collimator of a radiation therapy head in a head radiotherapy apparatus with real-time image guidance according to the present invention;

fig. 9 is a schematic structural diagram of a primary collimator of a radiation therapy head in a head radiotherapy apparatus with real-time image guidance according to the present invention.

Fig. 10 is a schematic structural diagram of a head radiotherapy apparatus with real-time image guidance according to a second embodiment of the present invention;

in the figure: 100-head radiotherapy equipment with real-time image guidance,

10-three degrees of freedom therapeutic bed, 20-multiple degrees of freedom stand, 21-stand base, 211-first guide rail,

2111-guide gear teeth, 22-outer frame gear ring, 221-first driving mechanism, 23-inner frame gear ring,

231-second driving mechanism, 24-semicircular bow, 241-supporting bearing, 242-internal gear teeth,

243-second guide rail, 30-radiation therapy head, 31-fourth driving mechanism, 32-box body, 321-upper box body,

3211-positioning step surface, 322-lower box body, 33-primary collimation body, 331-primary collimation hole,

332-mounting groove, 333-avoiding hole, 34-secondary collimating body, 341-secondary collimating hole, 342-mounting hole,

3421-keyway, 343-bearing mounting surface, 344-first rolling bearing, 35-shielding block,

36-driving device, 361-driving motor, 362-driving shaft, 37-ray source, 38-second rolling bearing,

40-image guidance system, 41-ray tube, 42-flat panel detector, 50-slip ring,

51-third drive mechanism.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1 to 5, a head radiotherapy apparatus 100 with real-time image guidance according to a first embodiment of the present invention includes a three-degree-of-freedom radiotherapy bed 10, a multi-degree-of-freedom gantry 20 and a radiotherapy head 30 disposed in the multi-degree-of-freedom gantry 20, the multi-degree-of-freedom gantry 20 includes a gantry base 21, an outer gantry ring gear 22 and an inner gantry ring gear 23 coaxially disposed on the outer and inner sides of the gantry base 21, and a half-circle arch 24 for mounting the radiotherapy head 30; the half-circle 24 is connected to the inner frame ring 22 by a support bearing 241 and is slidably connected to the frame base 21 by a slip ring 50.

As shown in fig. 4, two sets of image guiding systems are arranged on the outer rack gear ring 23, a first driving mechanism 221 and a second driving mechanism 231 for driving the outer rack gear ring 22 and the inner rack gear ring 23 to rotate around the axis of the rack base 21 are respectively arranged on the outer side and the inner side of the rack base 21, and the second driving mechanism 231 drives the inner rack gear ring 23 to drive the radiation therapy head 30 to rotate around the axis of the rack base 21. The semicircular bow 24 is connected to the inner rack gear ring 23 through a support bearing 241, and the rear end is fixed on the slip ring 50, so that the semicircular bow 24 can drive the radiation therapy head 30 to rotate continuously along with the inner rack gear ring 23 for a plurality of circles, and the slip ring 50 is utilized to realize left and right swinging on the rack base 21, in the embodiment provided by the invention, the radian of the semicircular bow 24 exceeds 200 degrees, so that the radiation therapy head 30 can rotate on the semicircular bow 24 by more than 200 degrees, and focus radiation therapy on tumor focus of a patient is realized.

When the head radiotherapy equipment 100 with real-time image guidance is needed to treat a patient, the patient is supported by the three-degree-of-freedom treatment table 10 and is sent to the multi-degree-of-freedom stand 20, so that the head tumor focus of the patient is positioned at the focus position of the radiation source of the radiation treatment head 30, the radiation source passes through the primary collimation body 33 and the secondary collimation body 34, then the second driving mechanism 31 is used for driving the inner stand ring 23 to rotate, the semicircular bow 24 is used for driving the radiation treatment head 30 to rotate continuously around the axis of the inner stand ring 23 for a plurality of circles, the sliding ring 50 is used for driving the semicircular bow 24 to drive the radiation treatment head 30 to swing left and right on the stand base 21 and driving the radiation treatment head 30 to rotate around the focus along the semicircular bow 24 on the semicircular bow 24, thereby realizing three degrees-of-freedom movement of the radiation treatment head 30 on the multi-degree-of-freedom stand 20, further enabling the radiation treatment head 30 to perform coplanar and non-coplanar arc-pulling focusing radiation, realizing full-spherical radiotherapy space, and realizing neck spine tumor treatment.

In addition, by driving the outer frame gear ring 22 by the first driving mechanism 22 to drive the double-set image guiding system 40 to rotate continuously around the axis of the outer frame gear ring 22 in the treatment process of the radiation treatment head 30, the double-set image guiding system can not interfere with the semicircular bow 24 in high-speed rotation and effectively improve the refresh rate of the image guiding system 40, high-definition real-time image guiding is realized, the tumor target area is collected at the tumor position and fed back in real time, and then the radiation treatment head 30 is driven by the multi-degree-of-freedom frame 20 to move to the tumor target area position and treat, so that the head radiotherapy device 100 with real-time image guiding has higher treatment precision. Through the two sets of image guiding systems 40 arranged in the outer rack gear ring 22, simultaneous operation of the low-energy spectrum CBCT (Cone Beam CT) and the high-energy spectrum CBCT can be realized, so that the image quality of the image guiding system 40 and the range of the observable tumor target area are effectively improved, and further the treatment precision of the head radiotherapy equipment 100 with real-time image guiding is further improved.

As shown in fig. 1, 2 and 5, a first guide rail 211 for guiding the sliding ring 50 to move is arranged on the stand base 21, a third driving mechanism 51 for driving the sliding ring 50 to move along the first guide rail 211 is arranged at the bottom of the sliding ring 50, and a fourth driving mechanism 31 for driving the radiation therapy head 30 to rotate along the semicircular arch 24 is arranged on the radiation therapy head 30. In the embodiment provided by the invention, the third driving mechanism 51 and the fourth driving mechanism 31 are also driving motors and gears fixed on the output shafts of the driving motors, the inner gear 242 meshed with the gears of the fourth driving mechanism 31 is arranged in the semicircular bow 24, the two sides of the semicircular bow 24 are provided with the second guide rail 243 for guiding the radiation therapy head 30 to move, and the driving motor of the third driving mechanism 51 drives the gears to drive the radiation therapy head 30 to rotate along the second guide rail 243 at any angle on the semicircular bow 24, so that the rotation precision of the radiation therapy head 30 on the semicircular bow 24 is effectively improved. The first guide rail 211 is provided with the guide gear teeth 2111 meshed with the gears of the fourth driving mechanism 31, and the driving motor of the fourth driving mechanism 31 drives the gears to drive the semicircular bow 24 to swing left and right on the frame base 21 along the first guide rail 211, so that the swing precision of the radiation therapy head 30 swinging along with the semicircular bow 24 on the frame base 21 is effectively improved. In addition, the semicircular bow 24 is connected in the inner rack gear ring 23 through the support bearing 241, and the inner rack gear ring 23 is driven by the driving motor of the second driving mechanism 231 to drive the radiation therapy head 30 mounted on the semicircular bow 24 to rotate around the axis of the inner rack gear ring 23, so that the radiation therapy head 30 has three degrees of freedom of movement on the multi-degree-of-freedom rack 20, and the radiation therapy head 30 can perform coplanar and non-coplanar arc-discharge focusing radiation, thereby realizing the whole brain spherical radiation therapy space, being capable of taking into account neck spinal tumor therapy, and further realizing true three-dimensional directional therapy.

As shown in fig. 1, 2 and 4, the image guidance system 40 includes a radiation tube 41 and a flat panel detector 42 symmetrically disposed within the outer gantry gear 22, wherein the radiation tube 41 is a kV radiation tube. The first driving mechanism 221 drives the outer frame gear ring 22 to drive the KV ray tube 41 and the flat panel detector 42 to rotate around the axis of the outer frame gear ring 22. By driving the outer gantry gear ring 22 by the first driving mechanism 221 to drive the KV ray tube 41 and the flat panel detector 42 to rotate around the axis of the outer gantry gear ring 22 and connecting the semicircular arch 24 in the inner gantry gear ring 23 coaxially arranged with the outer gantry gear ring 22 by the support bearing 241, the treatment surface of the image guiding system 40 and the radiation treatment head 30 can be made to be the same plane while ensuring that the image guiding system 40 and the radiation treatment head 30 perform multi-circle continuous rotation, thereby further ensuring that the KV ray tube 41 and the flat panel detector 42 are utilized to perform real-time image guiding (including positioning verification, motion analysis and monitoring) to acquire a tumor target area and the radiation treatment head 30 is utilized to perform treatment precision. In addition, the first driving mechanism 221 is used for independently driving the outer rack gear ring 22 to control the image guiding rotation, so that the rotation angle of the image guiding system 40 is +/-360 degrees, and the rotation angle and the semicircular bow 24 are not interfered with each other when the radiation therapy head 30 is driven to rotate rapidly in the rotation process, and therefore the image tracking and rapid imaging can be achieved through the +/-360-degree random rotation of the image guiding system 40. In the embodiment provided by the invention, the first driving mechanism 221 and the second driving mechanism 231 are driving motors arranged on the frame base 21 and gears fixed on output shafts of the driving motors, and the gears are respectively meshed with outer gear teeth on the outer frame gear ring 22 and the inner frame gear ring 23, so that the first driving mechanism 221 and the second driving mechanism 231 are in meshed transmission connection with the outer frame gear ring 22 and the inner frame gear ring 23, and the stability of the meshed transmission connection is ensured.

Referring to fig. 6-9, the radiation therapy head 30 includes a case 32, a primary collimator 33 and a secondary collimator 34 disposed in the case 32, a shielding block 35 fixed on top of the primary collimator 33, and a driving device 36 disposed on top of the case 32 for driving the secondary collimator 34 to rotate, and the fourth driving mechanism 31 is disposed on a side of the case 32. The primary collimator 33 is uniformly provided with a plurality of mounting grooves 332 for mounting the radiation sources 37 and a set of primary collimation holes 331 coaxially arranged with the mounting grooves 332, and the secondary collimator 34 is provided with a plurality of sets of secondary collimation holes 341. The primary collimation body 33 and the shielding block 35 are fixedly connected with the box body 32, and the driving device 36 passes through the shielding block 35 and the primary collimation body 33 to be fixedly connected with the secondary collimation body 34 and drives the secondary collimation body 34 to rotate relative to the box body 32, so that one group of secondary collimation holes 341 in the plurality of groups of secondary collimation holes 341 is communicated with the primary collimation holes 331 on the primary collimation body 33 and radiation of the radiation source 37 passes out of the box body 32 and is focused on one point. In the embodiment provided by the invention, the second-level collimation holes 341 are collimation through holes aiming at tumors, and the plurality of groups of second-level collimation holes 341 are six pairs of collimation holes with three specifications of diameter phi 5, diameter phi 7 and diameter phi 9 respectively.

When radiation therapy is needed by using the radiation therapy head 30, the driving device 36 passes through the shielding block 35 and the primary collimation body 33 and directly drives the secondary collimation body 34 to rotate relative to the box body 32, so that one group of secondary collimation holes 341 of six pairs of secondary collimation holes 341 with different diameters on the secondary collimation body 34 are aligned with the primary collimation holes 331 on the primary collimation body 33 according to the requirement of a therapeutic target, and the radiation emitted by the radiation source 37 passes through the primary collimation holes 331 and the secondary collimation holes 341, then is focused at one point outside the box body 32 and acts on a tumor target, thereby realizing the requirement of radiation therapy by using the radiation therapy head 30. After the treatment is finished, the driving device 36 is used for directly driving the secondary collimation body 34 to rotate relative to the box body 32, so that a plurality of groups of secondary collimation holes 341 on the secondary collimation body 34 are misplaced with the primary collimation holes 331 on the primary collimation body 33 and blocked, thereby blocking rays from penetrating out of the secondary collimation body 34 and further realizing source closing operation. The secondary collimation body 34 is directly driven to rotate relative to the box body 32 by the driving device 36, so that the field switching speed of the secondary collimation body 34 can be effectively improved, and the rapid field switching and source switching are realized; in addition, the whole radiation therapy head 30 has smaller volume, compact structure and lighter weight, thereby being suitable for performing multi-degree-of-freedom motion on a multi-degree-of-freedom rack of head radiotherapy equipment with real-time image guidance and further realizing the whole brain sphere therapy on head tumors.

In the embodiment provided by the invention, the shielding block 35 and the secondary collimating body 34 are made of high-density alloy such as lead alloy or tungsten alloy, and the shielding block 35 fixed on the primary collimating body 33 can effectively prevent the rays emitted by the ray source 37 from forming impurity scattering in the box 32 and penetrating out of the box 32, thereby causing a certain potential safety hazard and affecting the focusing effect of the rays after penetrating through the primary collimating holes 331 and the secondary collimating holes 341. The radiation therapy head 30 can be effectively shielded from radiation in the off-source state by using the secondary collimator 34 made of high-density alloy such as lead alloy or tungsten alloy.

As shown in fig. 6 and 7, the driving device 36 includes a driving motor 361 disposed on the shielding block 35 and a driving shaft 362 fixedly connected with the secondary collimating body 34, the centers of the shielding block 35 and the primary collimating body 33 are both provided with a avoiding hole 333 through which the driving shaft 362 passes, and the case 32 is provided with a positioning step surface 3211 for positioning the shielding block 35. The center of the secondary alignment body 34 is provided with a mounting hole 343 through which the driving shaft 362 penetrates and is fixed, the driving shaft 362 penetrates through the shielding block 35 and the avoidance hole 333 of the primary alignment body 33 and is fixed in the mounting hole 343, and the mounting hole 343 is internally provided with a key slot 3431 for fixedly connecting with the driving shaft 362. The driving shaft 362 of the driving device 36 sequentially passes through the shielding block 35 and the avoidance hole 333 of the primary collimating body 33, then penetrates into the mounting hole 343 of the secondary collimating body 34, and is inserted into the key slot 3431 by using the locking piece, and then the end part of the driving shaft 362 is locked into the mounting hole 343, so that key connection is formed between the two, the stability of fixed connection between the two is effectively ensured, and the stability of the driving motor 361 when the driving shaft 362 drives the secondary collimating body 34 to rotate relative to the box body 32 is further improved. In addition, the stability and the positioning precision of the shielding block 35 fixed in the box 32 can be effectively improved through the positioning step surface 3211 on the box 32, so that the stability and the positioning precision of the primary collimation body 33 fixed at the bottom of the shielding block 35 fixed in the box 32 are improved, the coaxiality between the two avoidance holes 333 is further improved, the clearance fit between the driving shaft 362 and the avoidance holes 333 is ensured, and the phenomenon that the driving precision and the stability of the driving shaft 362 are influenced due to abrasion caused by collision with the inner wall of the avoidance holes 333 when the driving shaft 362 drives the secondary collimation body 34 to rotate is avoided.

As shown in fig. 8, bearing mounting surfaces 344 are provided at both ends of the secondary collimator 34, and a first rolling bearing 345 is sleeved on the bearing mounting surfaces 344, and the secondary collimator 34 is rotatably connected with the accommodating cavity of the lower case 12 of the case 32 through the first rolling bearing 345. The first rolling bearing 345 is sleeved on the mounting surface of the secondary collimating body 34, so that the stability of the first rolling bearing 345 fixedly sleeved on the secondary collimating body 34 can be effectively ensured, and the first rolling bearing 345 can be effectively prevented from falling off from the secondary collimating body 34 when the secondary collimating body 34 rotates through the bearing mounting surface 344 and the extrusion force of the inner wall of the box body 32 acting on the first rolling bearing 345. The secondary collimation body 34 is rotationally connected with the box body 32 through the first rolling bearing 345, so that stability and positioning accuracy of the driving motor 361 driving the driving shaft 362 to drive the secondary collimation body 34 to rotate relative to the box body 32 can be effectively ensured, the secondary collimation body 34 and the primary collimation body 33 are ensured to be differential, the coaxiality of a group of secondary collimation holes 341 aligned with the primary collimation holes 331 is ensured, the focusing effect of rays emitted by the ray source 37 after passing through the primary collimation holes 331 and the secondary collimation holes 341 is further improved, and the treatment effect of the radiation therapy head 30 is ensured.

As shown in fig. 1, the shield block 35 and the escape hole 333 of the primary collimator body 33 are provided with a second rolling bearing 38, and the drive shaft 362 is rotatably connected to the inside of the escape hole 333 by the second rolling bearing 38. The positioning accuracy and radial displacement of the driving shaft 362 of the driving device 36 during rotation in the avoidance hole 333 can be effectively limited through the second rolling bearing 38, so that the stability of the driving shaft 362 for driving the secondary collimating body 34 to rotate through the shielding block 35 and the primary collimating body 33 and the coaxiality in the rotation process are effectively improved, and abrasion caused by overlarge swing amplitude of the driving shaft 362 in the avoidance hole 333 and collision with the inner wall of the avoidance hole 333 is avoided.

As shown in fig. 6 and 9, in the process of mounting the radiation source 37 to the primary collimator body 33, by inserting the radiation source 37 into the mounting groove 332, stability of fixing the radiation source 37 in the mounting groove 332 and coaxiality with the primary collimator hole 331 can be effectively ensured. Further, coaxiality between the rays emitted by the ray source 37 and a group of secondary collimation holes 341 on the secondary collimation body 34 is ensured, so that the rays penetrate out of the secondary collimation holes 341 of the secondary collimation body 34 and are focused on one point, and the treatment effect of the radiotherapy head is ensured. In the embodiment provided by the present invention, the source 37 is a cobalt 60 source 37. Cobalt 60 belongs to an artificial radioisotope of metallic element cobalt, has strong radiation and can effectively kill cancer cells. Under the conditions that the treatment effect of the operation is poor or the operation cannot be performed before the operation is large, the cobalt 60 treatment is selected to reduce the size of the tumor and reduce the metastasis of malignant tumor to other parts, so that the treatment effect of the radiation treatment head 30 is effectively improved.

As shown in fig. 6 and 7, the case 32 includes an upper case accommodating the shielding block 35 and the primary collimator body 33, and a lower case 12 accommodating the secondary collimator body 34, the lower case 12 being a hollow cavity and forming an accommodating cavity accommodating the secondary collimator body 34. In the embodiment provided by the invention, the box body 32 is a cuboid, the shielding block 35 is fixed at the top of the upper box body and is clamped and fixed on the positioning step surface 3211, the primary collimating body 33 is fixed at the bottom of the shielding block 35, the driving motor 361 is arranged at the top of the shielding block 35 and is arranged outside the box body 32, the driving shaft 362 penetrates through the shielding block 35 and the avoidance hole 333 of the secondary collimating body 34 and is then locked in the mounting hole 343 of the secondary collimating body through the locking member, and the secondary collimating body 34 is mounted in the accommodating cavity of the lower box body 12 of the box body 32 through the second rolling bearing 38, so that the two are rotationally connected, and the stability of the secondary collimating body 34 mounted in the box body 32 and the rotation precision of the secondary collimating body relative to the lower box body 12 are effectively improved.

Embodiment two:

referring to fig. 10, a head radiotherapy apparatus 100 'with real-time image guidance according to a second embodiment of the present invention is different from the first embodiment in that the head radiotherapy apparatus 100' with real-time image guidance according to the present embodiment is: the multi-degree-of-freedom gantry 20 'of the present embodiment includes a gantry base 21', a gantry inner ring 22 'disposed in the gantry base 21', an annular slide rail 23 'symmetrically disposed on the gantry inner ring 22', and a half-circle 24 'for mounting a radiation therapy head 30', and an image guidance system 40 'disposed on the annular slide rail 23'. In this embodiment, the image guidance system 40 'can rotate on the annular slide rail 23' along the annular slide rail 23 'to realize high-definition real-time image guidance, position the tumor position to collect the tumor target area and feed back the tumor target area in real time, and then drive the radiation therapy head 30' to move to the tumor target area position by using the multi-degree-of-freedom frame 20 'to perform treatment, so that the head radiotherapy apparatus 100' with real-time image guidance has higher treatment precision.

The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The utility model provides a take real-time image to guide's head radiotherapy equipment, includes three degree of freedom treatment beds (10), its characterized in that still includes multi freedom frame (20) and set up in radiation therapy head (30) in the multi freedom frame, multi freedom frame (20) include frame base (21), coaxial set up in outside and the inboard outer frame ring gear (22) of frame base (21) and interior frame ring gear (23) and be used for the installation semicircle bow (24) of radiation therapy head (30), semicircle bow (24) pass through support bearing (241) connect in frame ring gear (23) and through sliding ring (50) sliding connection on frame base (21).

Two sets of image guiding systems (40) are arranged on the outer rack gear ring (22), a first driving mechanism (221) and a second driving mechanism (231) for driving the outer rack gear ring (22) and the inner rack gear ring (23) to rotate around the axis of the rack base (21) are respectively arranged on the outer side and the inner side of the rack base (21), and the second driving mechanism (231) drives the inner rack gear ring (23) to drive the radiation therapy head (30) to rotate around the axis of the rack base (21).

2. A head radiotherapy apparatus with real-time image guidance according to claim 1, characterized in that the frame base (21) is provided with a first guide rail (211) for guiding the displacement of the slip ring (50), and the bottom of the slip ring (50) is provided with a third driving mechanism (51) for driving the slip ring (50) to swing along the first guide rail (211).

3. A head radiotherapy apparatus with real time image guidance according to claim 2, wherein the first guide rail (211) is provided with transmission guide teeth (2111) for engaging with the third drive mechanism (51).

4. A head radiotherapy apparatus with real time image guidance according to claim 1, characterized in that the radiotherapy head (30) is provided with a fourth driving mechanism (31) for driving the radiotherapy head (30) to rotate along the half-circular arch (24).

5. A head radiation therapy device with real-time image guidance as claimed in claim 4, characterized in that the semicircular arch (24) is provided with inner teeth (242) for engagement and transmission connection with the fourth drive mechanism (31) and a second guide rail (243) for guiding the radiation therapy head (30).

6. A head radiotherapy apparatus with real-time image guidance according to claim 1, characterized in that the outer edge surfaces of the outer rack gear ring (22) and the inner rack gear ring (23) are respectively provided with outer gear teeth for meshing transmission with the first driving mechanism (221) and the second driving mechanism (231).

7. The head radiotherapy apparatus with real-time image guidance according to claim 1, wherein the image guidance system (40) comprises a tube (41) and a flat panel detector (42) symmetrically disposed in the outer gantry gear ring (22), and the first driving mechanism (221) drives the outer gantry gear ring (22) to rotate the tube (41) and the flat panel detector (42) around the axis of the outer gantry gear ring (22).

8. The head radiotherapy apparatus with real-time image guidance according to claim 1, characterized in that the radiotherapy head (30) comprises a case (32), a primary collimator (33) and a secondary collimator (34) arranged in the case (32), a shielding block (35) fixed on top of the primary collimator (33), and a driving device (36) arranged on top of the case (32) for driving the secondary collimator (34) to rotate;

the primary collimation body (33) is uniformly provided with a plurality of mounting grooves (332) capable of being provided with a radiation source (37) and a group of primary collimation holes (331) which are coaxially arranged with the mounting grooves (332), the secondary collimation body (34) is provided with a plurality of groups of secondary collimation holes (341), and the driving device (36) drives the secondary collimation body (34) to rotate so that rays emitted by the radiation source (37) penetrate out of one group of secondary collimation holes (341) and are focused on one point.

9. The head radiotherapy apparatus with real-time image guidance according to claim 7, wherein the driving device (36) comprises a driving motor (361) arranged on the shielding block (35) and a driving shaft (362) fixedly connected with the secondary collimating body (34), the centers of the shielding block (35) and the primary collimating body (33) are respectively provided with an avoidance hole (333) through which the driving shaft (362) can penetrate, the center of the secondary collimating body (34) is provided with a mounting hole (342) through which the driving shaft (362) can penetrate and be fixed, and the driving shaft (362) penetrates through the avoidance holes (333) of the shielding block (35) and the primary collimating body (33) and is fixed in the mounting hole (342).

10. The head radiotherapy apparatus with real-time image guidance according to claim 8, wherein bearing mounting surfaces (343) are respectively disposed at two ends of the secondary collimating body (34), a first rolling bearing (344) is sleeved on the bearing mounting surfaces (343), the secondary collimating body (34) is rotationally connected with the case (32) through the first rolling bearing (344), a second rolling bearing (38) is disposed in the avoidance hole (333) of the shielding block (35) and the primary collimating body (33), and the driving shaft (362) is rotationally connected in the avoidance hole (333) through the second rolling bearing (38).