CN108785873A - It is a kind of rotatably to focus radiotherapy head, radiotherapy equipment and system - Google Patents

Abstract

The embodiment of the present invention discloses a rotary focused radiotherapy head, which includes: a hemispherical treatment head, a strip imaging source and a strip imager; wherein, the hemispherical treatment head can rotate around the central axis; the strip The strip-shaped imaging source includes a plurality of sub-imaging sources, and the plurality of sub-imaging sources are arranged on the hemispherical treatment head along the first direction, and can emit imaging beams respectively; The direction is arranged on the opposite side of the strip-shaped imaging source, and is used for receiving the imaging beam passing through the patient's affected part and converting the imaging beam into imaging signals. The embodiment of the invention also discloses a radiotherapy device and a radiotherapy system.

Description

A rotating focused radiotherapy head, radiotherapy equipment and system

technical field

The invention relates to the technical field of radiotherapy, in particular to a rotary focusing radiotherapy head, radiotherapy equipment and a system.

Background technique

As an effective means of treating tumors, radiotherapy is increasingly used in the treatment of head tumors.

At present, a commonly used rotary focused radiation therapy device for treating head tumors is shown in Figure 1. The radiation therapy device includes: a hemispherical treatment head that can rotate around the central axis and a hemispherical treatment head arranged outside the hemispherical treatment head Imaging device (such as orthogonal double-plate imaging device), wherein, a hemispherical treatment head can focus a plurality of treatment beams at an intersection T on the central axis, and the imaging device includes an imaging source and an imager for swinging the patient Bit imaging. When using the above-mentioned radiotherapy equipment for treatment, it is first necessary to use the above-mentioned imaging device to position the patient to ensure that the positioning imaging plane of the patient's head acquired by the imaging device is consistent with the treatment plane in the treatment plan, and then push the patient Enter the treatment cabin of the hemispherical treatment head, align the head tumor target area with the intersection point, and according to the treatment plan, the hemispherical treatment head will focus multiple treatment beams on the above intersection point while rotating around the central axis, so as to treat the tumor tissue. High doses of radiation with less radiation damage to surrounding normal tissues.

However, during or after the actual setting process, the treatment bed carrying the patient tends to sink, so that the actual treatment surface of the patient pushed into the treatment cabin is inconsistent with the setup imaging surface of the patient outside the treatment cabin, thus As a result, the actual treatment surface of the patient in the treatment cabin is inconsistent with the treatment surface in the treatment plan, which affects the accuracy of radiation therapy. In addition, since imaging can only be performed outside the treatment cabin, imaging during radiation therapy cannot be achieved.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a rotary focused radiotherapy head and radiotherapy equipment, which solves the inconsistency between the actual treatment surface of the patient in the treatment cabin and the treatment surface in the treatment plan in the prior art, and the inability to perform radiotherapy Imaging issues during the process.

In order to achieve the purpose of the present invention, the embodiment of the present invention provides a rotary focused radiotherapy head, which includes: a hemispherical treatment head, which can rotate around the central axis; a strip-shaped imaging source, including a plurality of sub-imaging sources, the A plurality of sub-imaging sources are arranged on the hemispherical treatment head along the first direction, and can respectively emit imaging beams; a strip imager is arranged on the opposite side of the strip imaging source along the second direction, and is used to receive an imaging beam of an affected part of the patient and convert the imaging beam into an imaging signal, wherein the second direction intersects the first direction.

In an embodiment, the distance between two adjacent sub-imaging sources arranged along the first direction in the strip-shaped imaging source is smaller than or equal to a preset value.

In one embodiment, the first direction is the longitude direction of the hemispherical treatment head or the central axis direction, and the second direction is the latitude direction; or, the first direction is the hemispherical treatment head The latitude direction of the head, the second direction is the longitude direction of the hemispherical treatment head or the direction of the central axis.

In one embodiment, when the strip imaging source is arranged along the longitudinal direction of the hemispherical treatment head or along the direction of the central axis, the strip imaging source is located at both ends of the hemispherical treatment head. between groups of radioactive sources.

In an embodiment, the strip imaging source or the strip imager arranged along the latitude direction is located close to the circular section where the center of the sphere is located.

In one embodiment, the hemispherical treatment head includes: a shield body, a source body, and a collimator that are sequentially covered; the strip-shaped imaging source is arranged on the source body or the collimator, and the The strip imager is arranged on the collimator.

In one embodiment, the strip imaging source is disposed on the inner cavity wall of the collimator or embedded in a groove on the outer wall of the collimator.

In one embodiment, the strip imager is an arc detector.

In one embodiment, the strip imager is a single row of detectors or multiple rows of detectors.

In one embodiment, the strip imaging source includes at least two groups of strip imaging sources, and correspondingly, the strip imager includes at least two groups of strip imagers, wherein one group of imagers receives a group of imaging sources The emitted imaging beam.

An embodiment of the present invention also provides a radiotherapy device, comprising: any radiotherapy head described above and a patient support device for supporting the patient and adjusting the position of the affected part of the patient.

An embodiment of the present invention also provides a radiotherapy system, including: a processing device and the radiotherapy equipment according to claim 11, wherein the processing device is used to receive the imaging signal sent by the strip imager and generate the imaging signal of the affected part Image, and adjust the patient support device according to the image of the affected part.

Compared with the prior art, the rotary focused radiation treatment head in the embodiment of the present invention includes: a hemispherical treatment head that can rotate around the central axis, and a strip imaging source and a strip imaging source arranged in the hemispherical treatment head. device, wherein the strip-shaped imaging source includes a plurality of sub-imaging sources, which are arranged on the hemispherical treatment head along the first direction, and can emit imaging beams respectively; the strip-shaped imager is arranged along the second direction intersecting with the first direction It is arranged on the opposite side of the strip imaging source, and is used for receiving the imaging beam passing through the patient's affected part and converting the imaging beam into an imaging signal. The current actual imaging surface of the patient's affected part can be obtained in real time by using the rotating focused radiotherapy head, and when the current actual imaging surface is inconsistent with the treatment surface in the treatment plan, the patient support device (such as a treatment bed, treatment chair, etc.) can be adjusted in time, so that The current actual imaging plane is always consistent with the treatment plane in the treatment plan, thereby improving the accuracy of radiotherapy and making imaging during radiotherapy feasible.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the description, and are used together with the embodiments of the application to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

Fig. 1 is a structural schematic diagram of a rotary focused radiotherapy device for treating head tumors in the related art;

Fig. 2 is a structural schematic diagram of a rotary focus radiotherapy head provided by an embodiment of the present invention;

3 is a comparison diagram of different distances between two adjacent sub-imaging sources according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of the position of the strip imaging source in the embodiment of the present invention;

Fig. 5 is the structural representation of hemispherical treatment head in the embodiment of the present invention;

6A and 6B are schematic diagrams of two arrangements of a strip imaging source and a strip imager in an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a radiotherapy device provided by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a radiotherapy system provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

Fig. 2 is a structural schematic diagram of a rotating focused radiotherapy head provided by an embodiment of the present invention. As shown in Fig. 2, the radiotherapy head 1 includes: a hemispherical treatment head 11 and a hemispherical treatment head 11 The strip imaging source 12 and the strip imager 13; wherein, the hemispherical treatment head 11 can rotate around the central axis CA; the strip imaging source 12 includes a plurality of sub-imaging sources 121, ..., 12i, ..., 12n, i is greater than or equal to 1 and an integer less than or equal to n, n is an integer greater than 1, the plurality of sub-imaging sources 121, ..., 12i, ..., 12n are arranged on the hemispherical treatment head 11 along the first direction, and can emit imaging beams respectively The strip imager 13 is arranged on the opposite side of the strip imaging source 12 along the second direction S2 intersecting with the first direction S1, for receiving the imaging beam passing through the patient's affected part (target point or target area) and converting the imaging beam into an imaging signal.

It should be noted here that the treatment beam emitted by the hemispherical treatment head 11 can be focused on the intersection point T, and the strip imaging source 12 arranged in the hemispherical treatment head 11 emits a plurality of deflected cones to the strip imager 13 to form The intersection point T is included in the overlapping area of the image beams, so that the patient's affected part aligned with the intersection point T is imaged.

It should also be noted here that the hemispherical treatment head 11 is approximately hemispherical as a whole, rather than absolutely hemispherical. It can be a bowl-shaped structure with a flat bottom as shown in FIG. 1 .

When using the above radiotherapy head 1 for imaging, multiple imaging beams (deconical beam ), a plurality of imaging beams pass through the affected part of the patient in the treatment cabin of the hemispherical treatment head 11, and are received in real time by the strip imager 13 arranged along the second direction S2 intersecting with the first direction S1, the strip imager 13 convert the received imaging beam into an imaging signal. When the hemispherical treatment head 11 rotates around the patient's affected part or the central axis CA, the strip imager 13 can acquire the imaging beams of the patient's affected part in different directions and generate corresponding imaging signals respectively. The imaging device itself of the imaging source 12 and the strip imager 13 or the processing device connected to the strip imager 13 generates a three-dimensional image of the affected part of the current patient according to the above-mentioned imaging signals. It can be seen that the above-mentioned radiotherapy head 1 can not only obtain the setup imaging plane of the patient in the treatment cabin during the setup phase, but also can obtain the actual treatment plane of the patient in the treatment cabin in real time during the radiotherapy phase after the setup imaging plane is acquired, Image-guided radiation therapy (IGRT) is performed using the actual treatment face for image-guided radiation therapy.

In view of the problem in the related art that the actual treatment surface of the patient in the treatment cabin may not be consistent with the treatment surface in the treatment plan, the embodiment of the present invention obtains the current actual imaging surface of the patient's affected part in the treatment cabin in real time by using the above radiation therapy head 1, and Keep the current actual imaging plane consistent with the treatment plane in the treatment plan. For example, at the first moment of the setup stage, the radiotherapy head 1 acquires the actual imaging plane of the affected part of the patient at the first moment——the setup imaging plane at the first moment, and the setup imaging plane at the first moment is consistent with the treatment plan The treatment surface remains the same. If after the first moment, before the hemispherical treatment head 11 emits the treatment beam, the patient supporting device carrying the patient sinks, the above radiation therapy head 1 acquires the first position of the affected part of the patient at the second moment after the patient supporting device sinks. The actual imaging surface at the second moment—the actual treatment surface at the second moment, and when it is detected that the actual treatment surface at the second moment is inconsistent with the treatment surface in the treatment plan, adjust the position of the affected part by adjusting the patient support device, so that the lower For a moment, the actual treatment surface is consistent with the treatment surface in the treatment plan. In the stage of radiotherapy in which the hemispherical treatment head 11 emits a treatment beam to treat the target area in the actual treatment surface, the above-mentioned radiation treatment head 1 acquires the actual treatment surface in real time, and keeps the actual treatment surface consistent with the treatment surface in the treatment plan , so that the treatment beam emitted by the hemispherical treatment head 11 can hit the patient's affected part, and compared with the related technology, the precision of radiation treatment is improved.

For the strip imaging source 12, as shown in FIG. The multiple sub-imaging sources 121, . . . , 12i, . For the strip imager 13, it can be a single row of detectors, or multiple rows of detectors.

Regardless of whether the sub-imaging sources 121, ..., 12i, ..., 12n in the strip-shaped imaging source 12 are single or multi-row, the adjacent two sub-imaging sources 12i arranged along the first direction S1 in the strip-shaped imaging source 12 The distance between and 12(i+1) is less than or equal to the preset value. In this way, compared with the arrangement in which the adjacent sub-imaging sources 12i and 12(i+1) have a larger distance, the intersection point between adjacent imaging beams is closer to the strip imaging source 12 and has a larger imaging range. Exemplary, as shown in Figure 3, when the distance between two adjacent sub-imaging sources 12i and sub-imaging sources 12(i+1) is d, the imaging beams of sub-imaging sources 12i and sub-imaging sources 12(i+1) The intersection point is A; when the distance between the sub-imaging source 12i and the adjacent sub-imaging source 12(i+1)' is d' and d' is greater than d, the sub-imaging source 12i and the sub-imaging source 12(i+1) The intersection point of the imaging beam of ' is B, as can be seen from Figure 3, the horizontal line where the intersection point B is located is farther away from the strip imaging source 12, because the imaging beams of the sub-imaging source 12i and the sub-imaging source 12(i+1)' have not passed through The shadow between the horizontal line where A is located and the horizontal line where B is located, therefore, in the setting mode where the adjacent sub-imaging sources 12i and 12(i+1) have a relatively large distance, the imaging at the shadow cannot be acquired, and the imaging range smaller.

Also as shown in FIG. 2 , the second direction S2 intersects the first direction S1 in space, and here, the intersecting manner includes but is not limited to being orthogonal. In more detail, the first direction S1 is along the central axis CA as shown in Figure 2, at this time, S1 is parallel to CA, and the second direction S2 is along the latitude direction; of course, the The first direction S1 can also be the longitude direction of the hemispherical treatment head 11, and the second direction S2 is still the latitude direction; or, the first direction S1 is the latitude direction of the hemispherical treatment head 11, The second direction S2 is the longitude direction of the hemispherical treatment head 11 or the direction of the central axis CA.

It should be noted here that the longitude direction refers to the hemispherical section direction passing through the central axis CA and the hemispherical treatment head 11 poles (similar to one of the two poles of a sphere), and the latitude direction is the hemispherical section perpendicular to the central axis CA. The direction of the circular section of the treatment head 11.

It can be seen from the above description that the arrangement directions of the strip imaging source 12 and the strip imager 13 are intersecting. When the strip imaging source 12 is arranged along the central axis CA or along the longitude direction, the strip imager is arranged along the latitude direction. On the contrary , when the strip imaging source 12 is arranged along the latitude direction, the strip imager is arranged along the central axis CA or along the longitude direction.

It should be noted here that the above-mentioned strip imaging source 12 can be a horizontal strip imaging source as shown in Figure 2, or an arc strip imaging source, and correspondingly, the above strip imager 13 can be The flat panel detector shown can also be an arc detector.

Continuing to refer to FIG. 2 , the strip imaging source 12 or strip imager 13 arranged along the latitude direction is located near the circular section where the center of the sphere (intersection T) is located, including being arranged on the circular section where the center of the sphere is located.

As shown in Figure 4, when the strip-shaped imaging source 12 is arranged along the longitudinal direction of the hemispherical treatment head 11 or along the direction of the central axis CA, the strip-shaped imaging source 12 is located in the hemispherical Between two groups of radiation sources sj and s(j+1) of the treatment head 11, wherein j is an integer greater than 1. In Fig. 4, the hemispherical treatment head 11 includes 6 groups of radiation sources, the 6 groups of radiation sources are helically distributed on the hemispherical treatment head 11, and the strip imaging sources 12 are located in the same direction along the longitude direction or along the direction of the central axis CA. Between adjacent radioactive source sj and radioactive source s(j+1), here, j is an integer greater than or equal to 1 and less than or equal to 5.

As shown in Figure 5, the hemispherical treatment head 11 can be a multi-layer rotatable structure, specifically comprising: a shielding body 111, a source body 112, and a collimating body 113 that are sequentially covered; wherein, the source body 112 is used to carry radiation Source, for example, multiple groups of radiation sources as shown in FIG. The beam is shielded to prevent radiation leakage. Between the source body 112 and the collimator body 113 , the hemispherical treatment head may further include: a switch body 114 for turning on or off the radiation source on the source body 112 . Here, the shield body 111 , the source body 112 , the switch body 114 and the collimator body 113 may rotate synchronously or asynchronously along the same central axis CA. In an embodiment, the strip imaging source 12 may be disposed on the source body 112 or the collimator 113 , and the strip imager 13 is disposed on the collimator 113 . Of course, the strip imaging source 12 and the strip imager 13 can also be arranged on the multi-layer rotatable structure of the hemispherical treatment head 11 in other ways, which is not specifically limited in this embodiment of the present invention.

For the situation that the strip-shaped imaging source 12 is arranged on the collimator, further, the strip-shaped imaging source 12 is arranged on the inner wall of the collimator 113 or embedded in the concave hole of the outer wall of the collimator 113. in the slot.

In the above description, the strip imaging source 12 is one group, however, the strip imaging source 12 can be divided into at least two groups of strip imaging sources, and the strip imager 13 arranged oppositely can receive the at least two The imaging beam sent by the group of strip imaging sources 12; exemplary, as shown in FIG. The imaging beams sent by the strip imaging sources 12A and 12B; or, the strip imaging source 12 is divided into at least two groups of strip imaging sources, and correspondingly, the strip imager 13 is also divided into at least two groups of strip imagers , wherein a group of imagers receives the imaging beams sent by a group of imaging sources; exemplary, as shown in FIG. 6B , the strip imaging source 12 is divided into two groups of strip imaging sources 12A and 12B, and the strip imager 13 Divided into two groups of strip imagers 13A and 13B, the imager 13A receives the imaging beam emitted by the imaging source 12A, and the imager 13B receives the imaging beam emitted by the imaging source 12B.

Fig. 7 is a schematic structural diagram of a radiation therapy device provided by an embodiment of the present invention. As shown in Fig. 7, the radiation therapy device 2 includes: the radiation therapy head 1 described in any of the preceding embodiments and a device for supporting the patient and adjusting Patient support device 3 at the affected part of the patient. The patient supporting device here may be a treatment bed, a treatment chair and other devices for supporting the patient.

No matter in the stage of positioning or in the stage of radiotherapy, the radiotherapy head 1 in the radiotherapy equipment 2 can acquire the current actual imaging surface of the affected part of the patient in the treatment cabin in real time, and determine the current actual imaging surface and the treatment surface of the treatment plan. If they are inconsistent, adjust the position of the affected part of the patient by adjusting the patient support device 3 to keep the current actual imaging plane of the patient's affected part consistent with the treatment plane in the treatment plan, thereby improving the accuracy of radiation therapy.

Fig. 8 is a schematic structural diagram of a radiation therapy device provided by an embodiment of the present invention, the radiation therapy device 4 includes a processing device 5 and a radiation therapy device 2, wherein the processing device 5 is used to receive the imaging sent by the strip imager 13 signal and generate an image of the affected area.

It should be noted here that the processing device 5 may be a processing device with a processing function such as a computer or a server, which is not specifically limited in this embodiment of the present invention.

Regardless of whether it is in the stage of setting up or in the stage of radiotherapy, the strip imager 13 of the radiotherapy head 1 of the radiotherapy equipment 2 in the above-mentioned radiotherapy equipment 4 can acquire the current actual imaging surface of the patient's affected part in the treatment cabin in real time, and The imaging signal corresponding to the current actual imaging surface is sent to the processing device 5, and the processing device 5 generates an image of the affected part according to the imaging signal and detects whether the current position of the affected part is consistent with the position of the affected part in the treatment plan. When it is determined that the current position of the affected part is inconsistent with the position of the affected part in the treatment plan , it indicates that the current actual imaging surface is inconsistent with the treatment surface of the treatment plan, and the processing device 5 adjusts the position of the patient's affected part by controlling and adjusting the patient support device 3, so as to keep the current actual imaging surface of the patient's affected part consistent with the treatment surface in the treatment plan, thereby Improve the precision of radiation therapy.

Although the embodiments disclosed in the present invention are as above, the described content is only an embodiment adopted for understanding the present invention, and is not intended to limit the present invention. Anyone skilled in the field of the present invention can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention must still be The scope defined by the appended claims shall prevail.

Claims (12)

1. A rotary focused radiotherapy head, characterized in that it comprises: Hemispherical treatment head, which can rotate around the central axis; A strip-shaped imaging source, including a plurality of sub-imaging sources, the plurality of sub-imaging sources are arranged on the hemispherical treatment head along the first direction, and can emit imaging beams respectively; a strip imager, arranged on the opposite side of the strip imaging source along the second direction, for receiving the imaging beam passing through the affected part of the patient and converting the imaging beam into an imaging signal, wherein the second direction is the same as The first directions intersect. 2 . The radiotherapy head according to claim 1 , wherein the distance between two adjacent sub-imaging sources arranged along the first direction in the strip-shaped imaging source is less than or equal to a preset value. 3 . 3. The radiation treatment head according to claim 1, wherein the first direction is the longitude direction or the central axis direction of the hemispherical treatment head, and the second direction is the latitude direction; or, The first direction is the latitude direction of the hemispherical treatment head, and the second direction is the longitude direction of the hemispherical treatment head or the central axis direction. 4. The radiotherapy head according to claim 3, characterized in that, when the strip-shaped imaging source is arranged along the longitude direction of the hemispherical treatment head or along the direction of the central axis, the strip-shaped imaging source An imaging source is located between the two sets of radiation sources of the hemispherical treatment head. 5 . The radiotherapy head according to claim 3 , wherein the strip imaging source or the strip imager arranged along the latitude direction is located close to the circular section where the center of the sphere is located. 6 . 6. The radiotherapy head according to claim 1, characterized in that, the hemispherical treatment head comprises: a shielding body, a source body and a collimator that are covered in sequence; the strip imaging source is arranged on the source body or the collimator, the strip imager is arranged on the collimator. 7 . The radiotherapy head according to claim 6 , wherein the strip-shaped imaging source is arranged on the inner cavity wall of the collimator or embedded in a groove on the outer wall of the collimator. 8. The radiotherapy head according to claim 1, wherein the strip imager is an arc detector. 9. The radiotherapy head according to claim 1, wherein the strip imager is a single-row detector or a multi-row detector. 10. The radiotherapy head according to claim 1, wherein the strip imaging source comprises at least two groups of strip imaging sources, and correspondingly, the strip imager comprises at least two groups of strip imagers, Wherein, a group of imagers receives imaging beams from a group of imaging sources. 11. A radiotherapy device, characterized by comprising: the radiotherapy head according to any one of claims 1-10 and a patient support device for supporting the patient and adjusting the position of the affected part of the patient. 12. A radiotherapy system, characterized by comprising: a processing device and the radiotherapy equipment according to claim 11, wherein the processing device is used to receive the imaging signal sent by the strip imager and generate an image of the affected part , and adjust the patient support device according to the image of the affected part.