JP2008237714A - Radiation therapy system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation therapy system, reducing the number of medical treatments, and decreasing operator's load in medical treatment. <P>SOLUTION: A radiation beam irradiating device 3 for medical treatment includes a plurality of irradiation sources 3a. The radiation beams 2 for medical treatment emitted from the respective irradiation sources 3a are focused on one focal point area 3b. A control device 15 controls a placing table driving device 30 to move a placing table 11 with the passage of time so that a medical treatment object part 9 in a human body 7 is always involved in the focal point area 3b based on an image of inside of the human body 7 image by an internal body imaging device 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radiation treatment system that treats a treatment target portion by irradiating the treatment target portion in a human body, and in particular, the number of treatments can be reduced and the operator during the treatment can reduce the number of treatments. The present invention relates to a radiation therapy system capable of reducing a burden.

  2. Description of the Related Art Various types of radiation treatment systems for treating a treatment target portion in a human body, specifically, for example, a treatment of a tumor by irradiating the tumor with a radiation beam have been known (for example, (See Patent Document 1).

  In a conventional radiation therapy system, a bed for placing a human body and a so-called donut-type gantry mechanism provided around the bed are provided. Here, when the human body is placed on the bed, the human body is positioned along the central axis of the rotating gantry mechanism. The rotating gantry mechanism rotates around the human body arranged at such a position.

  A radiation beam irradiator that irradiates a human body placed on a bed with a radiation beam (for example, a gamma ray beam) is attached to the rotating gantry mechanism. When a treatment is performed on the human body, the rotating gantry mechanism always rotates around the human body, so that various directions (360 ° of 360 ° from the radiation beam irradiator attached to the rotating gantry mechanism to the human body). Radiation beam is irradiated from (direction). By irradiating the human body with the radiation beam from various directions as described above, the normal tissue of the human body can be protected.

JP 2006-51064 A

  However, in the conventional radiotherapy system, since only one radiation beam irradiator is provided in the rotating gantry mechanism, there is a problem that a sufficient absorbed dose of the radiation beam cannot be obtained by one treatment. For this reason, it has been necessary to perform, for example, 20 to 30 treatments in the conventional radiotherapy system. When the radiation beam dose emitted from the radiation beam irradiator is increased in order to increase the absorbed dose of the radiation beam in one treatment, the human body itself may be damaged.

  In addition, in a conventional radiation therapy system in which only one radiation beam irradiator is provided in the rotating gantry mechanism, an operator such as a doctor or the like uses a radiation beam to accurately apply the radiation beam to a tumor in the human body. It is necessary to accurately adjust the irradiation direction of the radiation beam from the irradiator. However, such adjustment of the irradiation direction of the radiation beam is time-consuming and a heavy burden on the operator.

  In order to treat a tumor or the like on the head of a human body, a headgear dedicated to the head having a large number of irradiation sources has already been developed. By wearing such a headgear on the head of a human body and irradiating a radiation beam from various directions (360 ° direction) toward the head from a number of irradiation sources located around the head, The tumor on the head can be treated. However, it is difficult to directly apply a headgear dedicated to the head having such a large number of irradiation sources to a whole body radiotherapy system. This is because the position of a tumor on the head of the human body hardly fluctuates with respect to the head itself, whereas the position of a human lung tumor, etc., periodically fluctuates due to respiration. In some cases, the fluctuation range of the position accompanying the above exceeds 2 to 3 cm. Even if a headgear mechanism dedicated to the head having a large number of irradiation sources as described above is applied to such a whole-body radiation therapy system, each irradiation source has a periodic position variation. The irradiation direction of the radiation beam has to be constantly adjusted for each irradiation source, and in practice, it is almost impossible to adjust the irradiation direction of the radiation beam for each irradiation source.

  In addition, in order to deal with the problems related to the periodic fluctuations in the position of tumors such as lung tumors accompanying breathing of the human body as described above, it is possible to temporarily stop breathing of the human body and irradiate the tumor with a radiation beam in the meantime. Alternatively, it is known to perform a breathing synchronous irradiation method in which a change in the skin surface of the human body accompanying breathing is detected and the irradiation position of the radiation beam is changed in accordance with the change in the skin surface. Here, as a respiratory phase detection means necessary for the above-mentioned respiratory synchronous irradiation method, conventionally, a strain gauge is attached to the skin surface of the human body, and the fluctuation of the human skin surface due to breathing is used as a pressure change by the strain gauge. Those that detect and detect the respiratory phase from this pressure change have been adopted.

  However, in the method of temporarily stopping breathing of the human body and irradiating the tumor with the radiation beam during that time, the tumor position may not be stably stopped due to individual differences among patients. In addition, when a strain gauge is used in the breathing synchronized irradiation method, the pressure detection characteristic corresponding to the position fluctuation of the skin surface changes depending on the state of the strain gauge attached to the skin surface of the human body. There was a problem that it was difficult to detect the phase.

  The present invention has been made in consideration of such points, and a plurality of therapeutic radiation beams are applied to a treatment target portion such as a tumor from various directions using a therapeutic radiation beam irradiation apparatus having a plurality of irradiation sources. Can increase the absorbed dose of the therapeutic radiation beam for the treatment target portion in one treatment, thereby reducing the number of treatments, and for treatment from each irradiation source for the treatment target portion. It is an object of the present invention to provide a radiotherapy system that can reduce the burden on an operator during treatment without adjusting the irradiation direction of the radiation beam.

  The present invention relates to a radiotherapy system for treating a treatment target portion by irradiating the treatment target portion in a human body with a movable mounting table for placing a human body, A therapeutic radiation beam irradiation apparatus for irradiating a human body mounted on a table with a therapeutic radiation beam, the therapeutic radiation beam irradiation apparatus having a plurality of irradiation sources, wherein the therapeutic radiation beams irradiated from each irradiation source are in one focal region A therapeutic radiation beam irradiating apparatus that is focused on the human body, and irradiating the human body mounted on the mounting table with an imaging radiation beam to indicate the position of the treatment target portion in the human body. Based on a human body imaging device that generates an image of the human body, a mounting table driving device that moves the mounting table, and an image of the human body that is captured by the human body imaging device, the therapeutic radiation image is displayed. A control device for controlling the mounting table driving device so as to move the mounting table with time so that the treatment target portion in the human body is always included in the focal region of the therapeutic radiation beam in the system irradiation device. This is a radiation therapy system.

  According to such a radiation therapy system, the therapeutic radiation beam irradiation apparatus has a plurality of irradiation sources, and the therapeutic radiation beam irradiated from each irradiation source is focused on one focal region, Further, the mounting table driving device is controlled so as to move the mounting table with time so that a treatment target part such as a tumor in the human body is always included in the focal region. For this reason, the absorbed dose of the therapeutic radiation beam to the treatment target portion in one treatment can be increased by irradiating the treatment target portion such as a tumor from various directions. In addition, the irradiation direction of the therapeutic radiation beam emitted from each irradiation source of the therapeutic radiation beam irradiation apparatus is fixed in advance, and the focal region of the therapeutic radiation beam is fixed in position, and this position is fixed. Since the mounting table is moved over time so that the target area of the human body is always included in the focused area, the operator needs to adjust the irradiation direction of the therapeutic radiation beam from each irradiation source to the target area. Therefore, the burden on the operator during the treatment can be reduced.

  In the radiotherapy system of the present invention, the human body imaging device includes an X-ray tube and an X-ray detector disposed so as to sandwich the human body placed on the mounting table, the X-ray tube and the X-ray tube An X-ray detector rotates integrally around the human body, and an X-ray beam constantly irradiated from the X-ray tube toward the human body is detected by the X-ray detector. It is preferable that an image in the human body is generated with time. In this case, by rotating a combined body composed of an X-ray tube and an X-ray detector around the human body, images of the human body from various directions can be obtained, and the treatment target portion is included. It is possible to form a three-dimensional image in the human body.

  Here, it is particularly preferable that the X-ray tube is configured to irradiate an X-ray beam only to a limited region including a treatment target portion in the human body. Thereby, when performing image processing in the control device, radiation exposure to the normal tissue of the human body by the X-ray beam can be suppressed.

  In the radiotherapy system of the present invention, it is preferable that each irradiation source of the therapeutic radiation beam irradiation apparatus is configured to rotate integrally along a horizontally long elliptical locus around the human body. . Here, the human body placed on the mounting table is in a generally upright state, and the cross section of the human body becomes a horizontally long elliptical shape, so that each irradiation source rotates along a horizontally long elliptical locus around the human body. In this case, the distance between the irradiation source directly above the human body and the human body can be reduced, and even if the dose of the therapeutic radiation beam from each irradiation source is relatively small, A sufficient absorbed dose of the therapeutic radiation beam can be obtained.

  In the radiotherapy system of the present invention, when the control device controls the mounting table driving device based on an image inside the human body captured by the human body imaging device, Of these, it is preferable that mask processing is performed so as to exclude a region that does not include the treatment target portion, and the above-described table drive device is controlled using an image on which the mask processing has been performed. As a result, when an image is processed in the control device, the number of pixels in the image can be greatly reduced, and high-speed processing can be performed in the control device.

  In the radiotherapy system according to the present invention, the control device binarizes the image when performing control of the mounting table driving device based on an image inside the human body imaged by the human body imaging device. It is preferable to perform processing and to control the mounting table driving device using the image subjected to the binarization processing. As a result, the amount of data to be processed when an image is processed in the control device can be reduced, and high-speed processing can be performed in the control device.

  In the radiotherapy system of the present invention, the control device forms a three-dimensional image including the treatment target portion based on an image inside the human body imaged by the human body imaging device, and for the three-dimensional image Mask processing is performed so as to exclude a region that does not include the treatment target portion from the three-dimensional image, and binarization processing is performed on the three-dimensional image on which the mask processing has been performed. The three-dimensional position of the center of gravity of the treatment target portion is calculated from the three-dimensional image, and the center of gravity of the treatment target portion is always included in the focal region of the therapeutic radiation beam in the therapeutic radiation beam irradiation apparatus. It is preferable to control the mounting table driving device so as to move the lens over time. In this case, it becomes possible to detect the position of the treatment target portion more accurately by using a three-dimensional image including the treatment target portion. At this time, by performing mask processing, When performing processing, the number of pixels in the image can be significantly reduced, and further, by performing binarization processing, it is possible to reduce the amount of data to be processed when performing image processing in the control device. As a result, high-speed processing can be performed in the control device.

  According to the radiation therapy system of the present invention, the number of treatments can be reduced and the burden on the operator during the treatment can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 are views showing an embodiment of a radiation therapy system according to the present invention.
Among these, FIG. 1 is a schematic perspective view showing a configuration of a radiation therapy system in one embodiment of the present invention, FIG. 2 is a schematic side view of the radiation therapy system shown in FIG. 1, and FIG. FIG. 3 is a flowchart showing the contents of control in the control device of the radiotherapy system shown in FIGS. 1 and 2. FIG.

  The radiation therapy system according to the present embodiment performs treatment of the tumor 9 by irradiating a radiation beam to a treatment target portion inside the human body 7, specifically, a tumor 9 such as a lung tumor or a liver tumor. Is what you do. Here, the position of the lung tumor, the liver tumor, etc. is periodically fluctuated by the respiration of the human body 7, but the radiotherapy system according to the present embodiment does not involve the periodic movement due to the respiration. Tumors can also be treated.

  As shown in FIGS. 1 and 2, especially FIG. 2, the radiation therapy system includes a movable bed 11 for placing a human body 7, and a therapeutic radiation beam for the human body 7 placed on the bed 11. 2, a therapeutic radiation beam irradiation apparatus 3 having a plurality of irradiation sources (cobalt radiation sources) 3 a for irradiating 2, an X-ray tube 5 for irradiating a human body 7 with an X-ray beam (imaging radiation beam) 4, and X-rays The X-ray detector 6 that receives the X-ray beam 4 irradiated from the tube 5 and transmitted through the human body and generates a fluoroscopic image in the human body 7 from the received X-ray beam 4 and the bed drive that moves the bed 11 Device 30. Here, the X-ray tube 5 and the X-ray detector 6 constitute an X-ray CT apparatus (human body imaging apparatus) 20 for imaging inside the human body 7. A control device 15 for controlling the bed driving device 30 is installed in the radiation therapy system.

  Each component of such a radiotherapy system is explained in full detail below using FIG. 1 and FIG.

  As shown in FIGS. 1 and 2, the therapeutic radiation beam irradiation apparatus 3 includes a rotating gantry mechanism 1 and a plurality (for example, about 200) of irradiation sources (cobalt source) 3 a attached to the rotating gantry mechanism 1. The therapeutic radiation beam 2 is irradiated from each irradiation source 3a. The rotating gantry mechanism 1 is formed of a substantially spherical hollow structure, and the human body 7 is placed on the bed 11 along the central axis of the rotating gantry mechanism 1 when performing treatment. 1 rotates around the human body 7 arranged at such a position in the direction of the arrows in FIGS. 1 and 2.

  More specifically, a plurality of irradiation sources 3a are provided on the inner wall of the rotating gantry mechanism 1, and these irradiation sources 3a are, for example, according to the example of FIGS. Are arranged in one ring shape. Here, the attachment position of each irradiation source 3a with respect to the rotating gantry mechanism 1 is set and each irradiation source is set so that the therapeutic radiation beam 2 irradiated from each irradiation source 3a is focused on a substantially spherical focal region 3b. The irradiation direction of the therapeutic radiation beam 2 from 3a is fixed. Each irradiation source 3a is provided with a collimator for narrowing the divergence angle of the therapeutic radiation beam 2, and the collimator narrows the divergence angle of the therapeutic radiation beam 2 so that a specific part in the human body 7 is located. High doses can be collected. Further, the focal region 3b where the therapeutic radiation beam 2 irradiated from each irradiation source 3a is focused is always substantially the same in three-dimensional position (spatial coordinates) even when the rotating gantry mechanism 1 is rotated. Yes.

  As the therapeutic radiation beam 2, for example, a gamma ray (such as cobalt 60 which is a radioisotope) beam having an energy of about 1 MeV (million volts) is used.

  The X-ray tube 5 of the X-ray CT apparatus 20 irradiates the human body 7 with an X-ray beam 4 that is an imaging radiation beam. Specifically, the X-ray tube 5 irradiates the X-ray beam 4 so that the irradiation range includes the tumor 9 in the human body 7. Here, the X-ray tube 5 generates an X-ray beam 4 by accelerating electrons with a voltage of about 100 kV by an electron accelerating unit provided therein, and colliding the accelerated electrons with a metal target. It is preferable to irradiate the human body 7 with the X-ray beam 4.

  The X-ray detector 6 of the X-ray CT apparatus 20 receives the X-ray beam 4 irradiated from the X-ray tube 5 and transmitted through the human body 7, and detects, for example, a flat panel type semiconductor two-dimensional array having amorphous silicon. It consists of a vessel. The X-ray detector 6 generates a fluoroscopic image in the human body 7 from the received X-ray beam 4.

  As shown in FIGS. 1 and 2, a bed driving device 30 for moving the bed 11 is attached to the bed 11. The bed driving device 30 causes the bed 11 to move in the X, Y, and Z directions. It can move freely in any direction.

  Further, as described above, the radiotherapy system is provided with the control device 15 for controlling the bed driving device 30. The control device 15 is communicatively connected to the X-ray detector 6 and the bed driving device 30 of the X-ray CT apparatus 20 via cables. FIG. 3 is a flowchart showing the contents of control by the control device 15. The control contents of the control device 15 will be roughly described. The control device 15 is based on the fluoroscopic image in the human body 7 imaged by the X-ray CT apparatus 20, and the therapeutic radiation beam 2 in the therapeutic radiation beam irradiation device 3. The bed driving device 30 is controlled to reciprocate the bed 11 over time so that the tumor 9 in the human body 7 is always included in the focal region 3b.

  Next, the operation of the radiotherapy system having such a configuration will be described below. In addition, the control contents of the bed driving device 30 by the control device 15 will also be described.

  First, the human body 7 is placed on the bed 11 and the bed 11 is moved by the bed driving device 30 so that the human body 7 is positioned on the central axis of the rotating gantry mechanism 1. Then, while rotating the rotating gantry mechanism 1 in the directions of the arrows in FIGS. 1 and 2, a plurality of therapeutic radiation beams 2 are directed from the respective irradiation sources 3 a of the therapeutic radiation beam irradiation apparatus 3 toward the human body 7 in various directions ( 360 degree direction). At the same time, a combined body composed of the X-ray tube 5 and the X-ray detector 6 is integrally rotated around the human body 7, and the X-ray beam 4 constantly irradiated from the X-ray tube 5 toward the human body 7 is detected by X-rays. An image in the human body 7 is generated over time by being detected by the device 6. At this time, since the combined body including the X-ray tube 5 and the X-ray detector 6 is rotated around the human body 7, images in the human body 7 from various directions can be obtained, and the tumor A three-dimensional image in the human body 7 including 9 can be formed.

  The control device 15 constantly controls the bed driving device 30 according to the method shown in FIG. 3, so that the three-dimensional position of the tumor 9 can be obtained even when the tumor 9 periodically moves due to the respiration of the human body 7. The bed driving device 30 reciprocates the bed 11 so that the tumor 9 is always located within the focal range 3b of the therapeutic radiation beam 2 (dotted line portion in FIG. 2). No. 11).

  First, as shown in Step 1 of FIG. 3, in the control device 15, the three-dimensional image in the human body 7 is obtained based on fluoroscopic images from various angles with respect to the human body 7 obtained by the X-ray CT apparatus 20 over time. Form. At this time, the tumor 9 is included in the three-dimensional image. Next, as shown in Step 2 of FIG. 3, a mask process is performed on the obtained three-dimensional image so as to exclude a region not including the tumor 9 in the three-dimensional image. In this way, by removing the non-interested region of the three-dimensional image from the image processing target by the mask processing, the number of pixels in the three-dimensional image is determined when processing the three-dimensional image (described later) in the control device 15. It can be greatly reduced, and the control device 15 can perform high-speed processing.

  Then, as shown in Step 3 of FIG. 3, the binarization process is performed on the three-dimensional image on which the mask process has been performed. Here, the binarization process is to process all the pixels of the three-dimensional image so as to include only 0 or 1 data based on a preset threshold value. This makes it possible to reduce the amount of data to be processed when the control device 15 performs processing (described later) on a three-dimensional image, and allows the control device 15 to perform higher-speed processing.

  Thereafter, as shown in Step 4 of FIG. 3, the three-dimensional position (spatial coordinates) of the center of gravity of the tumor 9 is calculated from the binarized three-dimensional image. Specifically, the three-dimensional position of the center of gravity of the tumor 9 is calculated by performing processing on each pixel consisting of 0 or 1 in the three-dimensional image. Then, as shown in Step 5 of FIG. 3, the bed 11 is moved over time so that the center of gravity of the tumor 9 is always included in the focal region 3 b of the therapeutic radiation beam 2 in the therapeutic radiation beam irradiation apparatus 3. The drive device 30 is controlled. Specifically, the bed 11 is moved over time by the bed driving device 30 so that the three-dimensional position of the center of gravity of the tumor 9 is always substantially the same. More specifically, the center of the substantially spherical focal region 3b is the origin of coordinates (0, 0, 0), and the three-dimensional position of the center of gravity of the tumor 9 obtained by the above calculation is always the coordinate of the center of the focal region 3b ( The bed 11 is moved so as to return to (0, 0, 0).

  Then, as shown in Step 6 of FIG. 3, the bed 11 is moved over time by the bed driving device 30 until the radiation therapy by the radiation therapy system is completed.

  As described above, according to the radiation treatment system of the present embodiment as shown in FIGS. 1 to 3, the therapeutic radiation beam irradiation apparatus 3 has the plurality of irradiation sources 3a and is irradiated from each irradiation source 3a. The therapeutic radiation beam 2 is focused on one focal region 3b. Further, the bed driving device 30 is controlled to move the bed 11 with time so that the tumor 9 in the human body 7 is always included in the focal region 3b. Therefore, by irradiating the tumor 9 with a plurality of therapeutic radiation beams 2 from various directions, the absorbed dose of the therapeutic radiation beam 2 for the tumor 9 in one treatment can be increased. Further, the irradiation direction of the therapeutic radiation beam 2 irradiated from each irradiation source 3a of the therapeutic radiation beam irradiation apparatus 3 is fixed in advance, and the focal region 3b of the therapeutic radiation beam 2 is substantially fixed in position. Thus, since the bed 11 is moved with time so that the tumor 9 in the human body 7 is always included in the focal region 3b whose position is substantially fixed, the operator treats the therapeutic radiation from each irradiation source 3a with respect to the tumor 9. There is no need to adjust the irradiation direction of the beam 2, and the burden on the operator during treatment can be reduced.

  In addition, the radiotherapy system by this Embodiment is not limited to said aspect, A various change can be added. FIG. 4 is a schematic longitudinal sectional view showing another configuration of the radiation therapy system according to the present invention.

  In the radiotherapy system as shown in FIG. 4, the rotating gantry mechanism 1 is not a substantially spherical hollow structure, but a hollow structure whose cross section is a horizontally long oval shape. A plurality of irradiation sources 3a are provided. For this reason, each irradiation source 3a rotates integrally along a horizontally long elliptical trajectory surrounding the human body 7.

  Here, since the human body 7 placed on the bed is in a generally upright state, the cross section of the human body 7 has a horizontally long elliptical shape. For this reason, when each irradiation source 3a rotates along a horizontally long elliptical trajectory around the human body 7, the distance between the irradiation source 3a directly above the human body 7 and the human body 7 is reduced. Even when the dose of the therapeutic radiation beam 2 from each irradiation source 3a is relatively small, a sufficient absorbed dose of the therapeutic radiation beam 2 can be obtained in the tumor 9.

  In FIG. 4, only one ring is shown for a combination of a plurality of irradiation sources 3a. However, a rotating gantry mechanism 1 having a hollow structure whose cross section is a horizontally long oval is used. In this case, all the ring arrangements as shown in FIGS. 1 and 2 are horizontally long ellipses.

  Still another configuration of the radiation therapy system according to the present embodiment will be described with reference to FIG. FIG. 5 is a schematic longitudinal sectional view showing still another configuration of the radiotherapy system according to the present invention.

  As shown in FIG. 5, the combination composed of the X-ray tube 5 and the X-ray detector 6 rotates integrally around the human body 7, and is constantly irradiated from the X-ray tube 5 toward the human body 7. When the X-ray beam 4 is detected by the X-ray detector 6, an image in the human body 7 is generated over time. Here, the X-ray tube 5 is configured to irradiate the X-ray beam 4 only to a limited region including the tumor 9 in the human body 7. Then, the X-ray detector 6 detects the X-ray beam 4 only by a part 6A so as to receive the X-ray beam 4 irradiated only to a limited region including the tumor 9. Yes.

  According to the X-ray CT apparatus 20 as shown in FIG. 5, when the control apparatus 15 performs image processing, radiation exposure of the human body to normal tissue by the X-ray beam 4 can be suppressed.

  In still other radiotherapy systems, the spatial coordinates of the focal region of the therapeutic radiation beam irradiated from each irradiation source of the therapeutic radiation beam irradiation apparatus are not fixed and change over time. The couch driving device moves the couch over time so that a tumor in the human body is always included in the focal region that changes over time based on the image inside the human body imaged by the in-vivo imaging device. It may be like this.

It is a schematic perspective view which shows the structure of the radiotherapy system in one embodiment of this invention. It is a schematic side view of the radiotherapy system shown in FIG. It is a flowchart which shows the control content in the control apparatus of the radiotherapy system shown in FIG. 1, FIG. It is a schematic longitudinal cross-sectional view which shows the other structure of the radiotherapy system in this invention. It is a schematic longitudinal cross-sectional view which shows other structure of the radiotherapy system in this invention.

Explanation of symbols

1 Rotating gantry mechanism 2 Radiation beam for treatment (gamma ray beam)
3 Treatment radiation beam irradiation device 3a Irradiation source (cobalt radiation source)
3b focal region 4 X-ray beam 5 X-ray tube 6 X-ray detector 7 human body 9 tumor 11 bed 15 control device 20 X-ray CT device 30 bed driving device

Claims (7)

A radiation treatment system for treating a treatment target portion by irradiating the treatment target portion in a human body with a radiation beam,
A movable mounting table for mounting the human body;
A therapeutic radiation beam irradiation apparatus for irradiating a human body placed on the mounting table with a therapeutic radiation beam, the therapeutic radiation beam irradiation apparatus having a plurality of irradiation sources, and the therapeutic radiation beams irradiated from the irradiation sources having a single focal point A therapeutic radiation beam irradiator that is focused on the area;
A human in-vivo imaging device that generates an image in the human body that indicates the position of the treatment target portion in the human body by irradiating the human body placed on the mounting table with an imaging radiation beam;
A mounting table driving device for moving the mounting table;
Based on the image inside the human body imaged by the human body imaging device, the pedestal is placed over time so that the treatment target portion in the human body is always included in the focal region of the therapeutic radiation beam in the therapeutic radiation beam irradiation device. A control device for controlling the table drive device as described above,
A radiation therapy system comprising:   The human body imaging apparatus includes an X-ray tube and an X-ray detector arranged so as to sandwich the human body placed on the mounting table, and the X-ray tube and the X-ray detector are arranged around the human body. The X-ray detector constantly detects the X-ray beam emitted from the X-ray tube toward the human body, and generates an image of the human body over time. The radiation therapy system according to claim 1, wherein   The radiotherapy system according to claim 2, wherein the X-ray tube is configured to irradiate an X-ray beam only to a limited region including a portion to be treated in the human body.   2. The radiotherapy according to claim 1, wherein each irradiation source of the therapeutic radiation beam irradiation apparatus is integrally rotated along a horizontally long elliptical locus around the human body. system.   When the control device controls the mounting table driving device based on the image inside the human body imaged by the human body imaging device, the control device includes a region that does not include a treatment target portion in the image. 2. The radiotherapy system according to claim 1, wherein a mask process to be excluded is performed, and the table drive device is controlled using an image on which the mask process has been performed.   The control device performs binarization processing on the image when performing control of the mounting table driving device based on the image inside the human body imaged by the human body imaging device, and this binarization processing 2. The radiotherapy system according to claim 1, wherein the pedestal drive device is controlled using an image obtained by performing the above.   The control device forms a three-dimensional image including the treatment target portion based on an image inside the human body imaged by the human body imaging device, and the treatment target among the three-dimensional image is the treatment target. A mask process that excludes a region that does not include a part is performed, and a binarization process is performed on the three-dimensional image on which the mask process is performed. The three-dimensional position of the center of gravity is calculated, and the table is moved so that the center of gravity of the treatment target portion is always included in the focal region of the therapeutic radiation beam in the therapeutic radiation beam irradiation apparatus. The radiotherapy system according to claim 1, wherein the gantry driving device is controlled.

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