JPH09192245A - Radiotherapy system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately position radiation on a treatment part of an analyte and radiate the radiation thereon by arranging a positioning device, which positions the treatment part on the analyte on a bed based on a photographed image obtained from an imaging device, in such a position as confirming the treatment part of the analyte on the bed. SOLUTION: A radiotherapy system 1 provided with an X-ray CT 30 as an imaging device is provided with an X-ray positioning device 50 and a radiation treatment device 70. The X-ray positioning device 50 has an X-ray generating part 51, an image intensifier 53, and a support part 55 for rotatably supporting them, positions the treatment part, while referring to a fluoroscopic image, and decides the center of the treatment part. The X-ray positioning device 50 is so installed that the height of the positioning center in relation to a reference plane is equal to the height of the photographic center of an X-ray CT 30 in relation to the reference plane based on the positioning center so that the radiation can be accurately radiated on the treatment part of the analyte.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation treatment apparatus for irradiating radiation to treat a subject, and imaging for photographing the treatment region of the subject to confirm the location and size of the treatment region. The present invention relates to a radiation treatment system including a device and a positioning device that determines a treatment site.

[0002]

2. Description of the Related Art In recent years, radiation treatment has been performed to irradiate a treated region of a subject with radiation to destroy lesions in the treated region. In the case of performing such radiation treatment, first, a tomographic apparatus, for example, an X-ray CT apparatus, is used to include a treatment area by a tomography apparatus for obtaining a tomographic image of a subject in order to obtain detailed information such as the location, size, and depth of the treatment area. Take a tomographic image in the vicinity. From this tomographic image, detailed information such as the location, size, and depth of the treatment site is obtained. Next, an X-ray positioning apparatus that performs X-ray imaging for positioning the treatment site is used, and X-ray imaging near the treatment site is performed based on the above information. Then, while monitoring the X-ray fluoroscopic image obtained in this way, the height and position of the tabletop of the bed are set so that the center of the treatment site becomes the positioning center (rotation center) of the X-ray positioning apparatus. Then, while viewing the X-ray fluoroscopic image, the two sets of wire collimators of the X-ray positioning apparatus are set to the size of the treatment site, that is, the region to be treated by irradiation with radiation, and X-ray imaging is performed for confirmation. Further, the irradiation field lamp is turned on instead of the radiation, and marking is performed on the body surface corresponding to the treatment site based on the projection view on the body surface limited by the opening of the wire collimator. In this way, the treatment site is positioned.

Next, the opening degree value of the wire collimator of the X-ray positioning apparatus and the opening degree value of the diaphragm of the radiotherapy apparatus are made the same. At this time, the irradiation field lamp of the radiotherapy apparatus is turned on, and it is possible to visually confirm whether or not the projected view on the surface of the subject limited by the diaphragm and the marking position match. Then, after the positioning is completed, treatment is performed by the radiation treatment apparatus.

Usually, the tomographic imaging apparatus, the X-ray positioning apparatus and the radiotherapy apparatus are installed in separate rooms, and the subject goes to the room of each apparatus in order to be diagnosed or treated by each apparatus. You need to get on and off the top of the bed of the device.

[0005]

However, in the conventional radiotherapy, radiation is emitted based on the marking position on the surface of the subject, but the movement of the subject and the boarding / alighting of the bed of each device cause the radiation. Since the internal organs move, the positional relationship between the marking position on the surface of the subject and the actual treatment site shifts around the internal organs, and it is extremely difficult to accurately irradiate the treatment site with radiation.

Furthermore, since the structure, rigidity and material of the top plate are different for each device, the amount of bending of the top plate when the subject is placed is also different. Due to the difference in the bending amount of the top plate, there is a possibility that the positioned position cannot be accurately irradiated with radiation.

As described above, when each apparatus is installed in a separate room and the subject moves to get on and off the bed of the bed of each apparatus, the treatment site is moved and the bed of the bed of each apparatus is moved. Accurate positioning is extremely difficult due to differences in the amount of flexure when the subject is placed, and as a result, it may not be possible to accurately irradiate only the treatment site.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a radiation treatment system capable of accurately positioning and irradiating radiation to a treatment site of a subject.

[0009]

In order to achieve the above object, the present invention provides a bed which is rotatably supported in a direction parallel to a reference plane, and a treatment of an object on the bed which is arranged near the bed. An imaging device capable of imaging a region and a positioning device arranged at a position where the treatment region of the subject on the bed can be confirmed, and a positioning device for locating the treatment region of the subject on the bed from a captured image obtained by the imaging device. And a radiation treatment apparatus which is disposed at a position on the bed where radiation can be applied to a treatment area of the subject and which performs radiation treatment by irradiating the treatment area positioned by the positioning device. Use as a summary.

In the radiotherapy system of the present invention,
The imaging device is arranged in an appropriate position around a bed that is rotatable in a direction parallel to the reference plane, for example, in a horizontal direction, specifically, a position where a treatment site of a subject near the bed can be imaged. Imaging the treatment site of the subject above, the positioning device is disposed at an appropriate position around the bed, specifically a position where the treatment site of the subject on the bed can be confirmed,
The treatment area of the subject on the bed is determined from the captured image obtained by the imaging device, and the height of the positioning center is set to be the same as the height of the imaging center of the imaging device. , The radiation treatment apparatus is disposed at an appropriate position around the bed, specifically, at a position capable of irradiating the treatment area of the subject on the bed with radiation, with respect to the treatment area determined by the positioning device, Treatment is performed by irradiating radiation, and the height of the treatment center is set to be the same as the height of the imaging center of the imaging device, and the bed is shared by the respective devices. Therefore, it is possible to accurately position and irradiate the treatment area of the subject.

Further, an apparatus having a detection means for detecting the installation position of the bed, and an apparatus corresponding to the installation position of the bed detected by the detection means among the imaging device, the positioning device and the radiotherapy apparatus. It may be configured to have a safety device that stops the operation of a device other than the above.

The positioning device sets the height of the position of the positioning center with respect to the reference plane at the time of the positioning to be the same as the height of the imaging center of the imaging device, and the radiation treatment apparatus uses the reference of the treatment center. The height with respect to the plane may be the same as the height with respect to the reference plane of the imaging center of the imaging device.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a radiotherapy system according to the present invention, FIG. 2 is a top view thereof, and FIG. 3 is a side view thereof.

As shown in FIGS. 1 to 3, the radiation treatment system 1 of this embodiment includes a bed 10, an X-ray CT apparatus 30 as an imaging apparatus, an X-ray positioning apparatus 50 as a positioning apparatus, and radiation. It has a treatment device 70 and an interlock device (not shown) as a safety device. The bed 10, the X-ray CT apparatus 30, the X-ray positioning apparatus 50, and the radiotherapy apparatus 70 are installed in the same room.

The bed 10 includes a top plate 11 on which a subject is placed.
And a top-and-bottom movement that moves the top-and-bottom 11 up and down as shown by an arrow A in FIG. 3, and a top-and-left movement as a top-and-left movement that moves the top-and-top 11 in a direction orthogonal to its longitudinal direction as shown by an arrow B in FIG. , A top-and-back movement of the top 11 for moving the top 11 in its longitudinal direction as shown by an arrow C in FIG. A column is rotated to rotate in the same direction as a plane parallel to the (horizontal plane), and an isocentric rotation is performed to rotate the entire couch 10 around a predetermined position in the direction of extension of the tabletop as shown by an arrow D in FIG. be able to. Further, the bed 10 has an interlock device 80 as shown in FIG.

The X-ray CT apparatus 30 has an X-ray generation source for generating X-rays, a pedestal 31 having a detector for detecting X-rays transmitted through the subject, and the vicinity of the treatment site of the subject. Obtain a tomographic image of. In addition, the X-ray CT apparatus 30 shares the bed 10.

The X-ray positioning device 50 includes an X-ray generator 51 for generating X-rays, an image intensifier 53 for converting the X-rays transmitted through the subject into an optical image, and an X-ray source 51 image intensity. And a support portion 55 that rotatably supports the fire 53, and obtains an X-ray fluoroscopic image for determining a treatment site. Next, the treatment site is positioned from the obtained fluoroscopic image, and the center of the treatment site is determined.
Further, based on the determined positioning center, the X-ray positioning apparatus 50 is adjusted so that the height of the positioning center with respect to the reference plane is
The X-ray CT apparatus 30 is installed at the same height as the center of imaging with respect to the reference plane. Furthermore, the X-ray positioning device 5
0 shares the bed 10 and is installed at a position of, for example, 90 degrees with respect to the X-ray CT apparatus 30 with reference to the center of rotation of the column of the bed 10.

The radiation treatment apparatus 70 includes a radiation generation section 71 for irradiating the treatment area with radiation and a radiation generation section 7.
The rotating part 73 that rotates 1 around the treatment region is used to irradiate the treatment region with radiation. In addition, the radiation therapy apparatus 70 has the X-ray CT apparatus 30 with a height of the treatment center.
The height is set to be the same as the height of the image pickup center with respect to the reference plane. Further, the radiation therapy apparatus 70 shares the bed 10 and is located at a position of approximately 90 degrees with respect to the X-ray positioning apparatus 50 with respect to the center of rotation of the column of the bed 10. It is installed at a position of about 180 degrees based on the center of rotation of the column.

The interlock device 80 includes three micro switches 81a, 81b and 81c as shown in FIG.
And six inverter circuits 83a, 83b, 83c, 8
5a, 85b, 85c and three AND circuits 87a, 8
7b and 87c for preventing the generation of X-rays or radiation from devices other than the device on which the bed 10 is installed.

The height of the positioning center of the X-ray positioning apparatus 50 with respect to the reference plane is the same as the height of the radiotherapy apparatus with respect to the treatment center of the reference plane. However, in actuality, the other device should be fitted to the device with the highest height. Here, the radiation therapy apparatus 70
Since the height of the treatment center is the highest, the height of the imaging center of the X-ray CT apparatus 30 and the height of the positioning center of the X-ray positioning apparatus 50 are adjusted to that height. For this height adjustment, for example, a table for height adjustment is used for the X-ray positioning apparatus 50 and the radiation treatment apparatus 70.
It is done by installing each under.

Next, the radiation treatment system 1 of this embodiment
Will be described. First, in order to obtain a tomographic image of the vicinity of a treatment region of a subject using the X-ray CT apparatus 30, the bed 10 is rotated by a support column and installed on the X-ray CT apparatus 30 side (180 from the position shown in FIG. 2). Rotate the column to install it). In this state, the X-ray CT apparatus 30 obtains a tomographic image of the vicinity including the treatment site of the subject. The operator obtains the position, size, depth from the body surface, etc. of the treatment site based on this tomographic image.

Next, the bed 10 is rotated by the support column and installed on the X-ray positioning apparatus 50 side. In this state, the operator
An X-ray fluoroscopic image in the vicinity of the treatment site is obtained using the X-ray positioning apparatus 50 based on the position, size, depth from the body surface, etc. of the treatment site obtained from the tomographic image. At this time,
In order to accurately determine the position and the like of the treatment site, the support part 55 is rotated to take X-ray fluoroscopic images from a plurality of directions.

While looking at this X-ray fluoroscopic image, the operator
The opening degree of a wire collimator provided in the line generation unit 51 and having a pair of parallel wires intersecting each other to form a well (the parallel 2
Adjust the part where the pair of wires cross)
That is, the irradiation range is set. Then, the operator records the opening degree of the wire collimator, stops the X-ray generation, turns on the irradiation field lamp provided in the X-ray generation unit 51, and projects the light onto the body surface of the subject. Mark on the body surface according to the wire collimator.

Next, the bed 10 is rotated by the support column and installed on the side of the radiotherapy apparatus 70. Then, the operator sets a diaphragm that limits the radiation irradiation field of the radiotherapy apparatus 70 based on the opening of the wire collimator. Further, the irradiation field lamp provided in the radiation generation unit 71 of the radiation therapy apparatus 70 is turned on to project the light irradiation field on the body surface to confirm the matching with the marking on the opposite surface. This gives X
The radiation irradiation range determined using the X-ray CT apparatus 30 and the X-ray positioning apparatus 50 can be accurately set in the radiotherapy apparatus 70. In this state, radiation is applied from the radiation treatment apparatus 70 to perform treatment.

Next, the operation of the interlock device 80 will be described with reference to FIG.
This will be described with reference to FIG. The microswitches 81a, 81b, 81c provided in the bed 10 operate when the bed 10 is set at each position of the X-ray CT apparatus 30, the X-ray positioning apparatus 50, and the radiotherapy apparatus 70, and the contact point c
1 and the contact c2 are conducted. The contact point c1 is connected to the ground potential, and the contact point c2 is connected to the inverter circuits 83a and 83.
b, 83c, and the contact point c3 is the inverter circuit 85.
a, 85b, 85c. Further, the output side of the inverter circuit 83a is connected to the AND circuit 87b and the AND circuit 87c, the output side of the inverter circuit 83b is connected to the AND circuit 87a and the AND circuit 87c, and the output side b of the inverter circuit 83c is connected to the AND circuit 87a. AN
The inverter circuits 85a and 85 are connected to the D circuit 87b.
AND circuits 87a, 87b, 8 are provided on the output side of b, 85c.
7c, respectively. Further, the AND circuit 8
7a is connected to the X-ray generation permission signal transmission line of the X-ray CT apparatus 30, the AND circuit 87b is connected to the X-ray generation permission signal transmission line of the X-ray positioning apparatus 50, and the AND circuit 87c is connected. A radiation generation permission signal transmission line of the radiation treatment apparatus 70 is connected. Further, the AND circuit 87
The output sides of a, 87b and 87c are connected to the respective devices as X-ray generation signals or radiation generation signals of the respective devices.

For example, when the bed 10 is set in the X-ray CT apparatus 30, as shown in FIG.
The contact point c1 of the inverter c
The input of a is low level, the output is high level, that is, AND
One of the inputs of circuit 87a goes high.

At this time, the micro switches 83b, 83
Since c is not operating, each contact c1 is contact c
It remains in conduction with 2. Therefore, the inverter circuit 83
The signal input to the AND circuit 87a via b and 83c remains at the high level.

In this state, when the X-ray CT device 30 outputs the X-ray generation permission signal (high level), the other one of the inputs of the AND circuit 87a becomes high level, and the four inputs of the AND circuit 87a become. All become high level. For this reason,
The AND circuit 87a outputs an X-ray generation signal (high level), and the X-ray CT apparatus 30 can generate (irradiate) X-rays.

At this time, the micro switches 83b and 83
Since the contact c1 of c remains in conduction with the contact c2,
Of the four inputs of each of the ND circuits 87b and 87c, 2
One remains at the low level and the other remains at the high level, the X-ray generation signal of the X-ray positioning apparatus 50 and the radiation generation signal of the radiation therapy apparatus 70 are not output, and the X-ray positioning apparatus 50 outputs X-rays and radiation therapy. No radiation can be generated from the device 70. Therefore, it is possible to prevent X-ray irradiation or radiation irradiation from a device other than the device on which the bed 10 is installed.

As described above, in the radiotherapy system 1 of this embodiment, the X-ray C is shared so that one bed 10 is shared.
The height of the T apparatus 30 with respect to the reference plane of the imaging center, the height of the positioning center of the X-ray positioning apparatus 50 with respect to the reference plane, and the height of the radiotherapy apparatus 70 with respect to the reference center of the treatment center are made to be the same. Since the X-ray positioning apparatus 50, the X-ray positioning apparatus 50, and the radiation therapy apparatus 70 are installed at predetermined positions around the bed 10, for example, movement of the subject and elevation of the bed 10 are eliminated, and the treatment site of the subject can be accurately measured. It becomes possible to position and to irradiate with radiation.

In the radiotherapy system 1 of this embodiment, the X-ray CT apparatus 30 is used as the imaging apparatus, but the present invention is not limited to this, and other imaging apparatus such as an MRI apparatus may be used. May be. Further, the number of devices is not limited to three in the radiation treatment system 1 of this embodiment, and three or more devices may be used. Further, the installation position of the device is not limited to the radiotherapy system 1 of the present embodiment, and the height of the imaging center, the height of the positioning center, and the height of the treatment center are the same, the bed 10 is shared, and each device is affected. It may be installed at any position as long as it is installed so that it does not affect.

Further, the interlock device 80 of the radiotherapy system 1 of the present embodiment includes a micro switch 81.
a, 81b, 81c and inverter circuits 83a, 83
b, 83c, 85a, 85b, 85c and AND circuit 8
Although it is composed of 7a, 87b, and 87c, it may have another structure.

Furthermore, each device is connected online,
The conditions of other devices may be set based on the data of each device. For example, in the radiotherapy system 1 of the present embodiment, when the opening degree of the wire collimator of the X-ray positioning apparatus 50 is determined, the aperture of the radiotherapy apparatus 70 is also set.

[0034]

As described above, according to the present invention, the imaging apparatus, the positioning apparatus, and the radiotherapy apparatus are installed so as to share one bed, so that the movement of the subject and the raising and lowering of the bed are eliminated. Thus, it becomes possible to accurately position and irradiate the treatment area of the subject.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a radiotherapy system according to the present invention.

2 is a top view of the radiation treatment system shown in FIG. 1. FIG.

3 is a side view of the radiant battlefield quantity system shown in FIG. 1. FIG.

FIG. 4 is a diagram showing an interlock device provided on a bed of the radiation therapy system shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Radiation treatment system 10 Bed 11 Top plate 30 X-ray CT apparatus 31 Stand 50 X-ray positioning device 51 X-ray generation part 53 Image intensifier 55 Support part 70 Radiation therapy device 71 Radiation generation part 73 Rotation part 80 Interlock device 81a , 81b, 81c Micro switch 83a, 83b, 83c, 85a, 85b, 85c Inverter circuit 87a, 87b, 87c AND circuit

Claims (3)

[Claims] 1. A bed which is rotatably supported in a direction parallel to a reference plane, an imaging device which is arranged in the vicinity of the bed and can image a treatment site of a subject on the bed, and a bed on the bed. Arranged at a position where the treatment site of the specimen can be confirmed, a positioning device for positioning the treatment site of the subject on the bed from the captured image obtained by the imaging device, and radiation to the treatment site of the subject on the bed. A radiation therapy system, comprising: a radiation therapy apparatus which is disposed at a position where irradiation can be performed and which irradiates radiation to a treatment site positioned by the positioning apparatus to perform treatment. 2. An apparatus having a detection unit for detecting the installation position of the bed, and an apparatus corresponding to the installation position of the bed detected by the detection unit, among the imaging apparatus, the positioning apparatus and the radiotherapy apparatus. The radiotherapy system according to claim 1, further comprising a safety device that stops the operation of devices other than the above. 3. In the positioning device, a height of a position of a positioning center at the time of positioning with respect to a reference plane is the same as a height of an imaging center of the imaging device, and the radiotherapy apparatus has a reference of the treatment center. 3. The radiotherapy system according to claim 1, wherein the height with respect to the plane is the same as the height with respect to the reference plane of the imaging center of the imaging device.