JP2011172712A - Treatment table positioning device for particle radiotherapy system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment table positioning device for a particle radiotherapy system which automatically focuses on an isocenter of the positioning device from CT image photography. <P>SOLUTION: A relative current position of a CT treatment table with respect to a CT isocenter when a CT image has been photographed by a self-propelled CT is stored. The stored relative current position is used to operate a position of the positioning treatment table with respect to the positioning isocenter so that the same position becomes identical to a position of the CT table with respect to the CT isocenter, and a position setting mechanism of the positioning treatment table is controlled. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a treatment table positioning device for positioning a treatment table in order to irradiate a predetermined position of a patient with a particle beam in a particle beam treatment system used for cancer treatment or the like.

  Conventionally, radiation therapy is known in which radiation is applied to tumors such as cancer, but recently, particle beam therapy using heavy particles such as carbon and particle beams such as protons as radiation Attention has been paid. In such particle beam therapy, it is important to irradiate the particle beam appropriately and efficiently to human cancer.

  In such a particle beam therapy apparatus, as a preparation before actually irradiating the particle beam, a CT image of the affected area is taken, and based on that, the particle beam is irradiated where and how the particle beam is irradiated. An X-ray image used for positioning during irradiation is taken based on the above. This procedure may be performed in a treatment room where the particle beam is actually irradiated, or a dedicated particle beam treatment simulator device may be used. The particle beam therapy simulator device is a device specialized for photographing a positioning X-ray image at the time of particle beam irradiation. By taking an X-ray image for positioning with a particle beam therapy simulator installed in a different place from the treatment room used for particle beam irradiation, the treatment room can be used only for particle beam irradiation. The number of treatable patients per unit time of the entire treatment apparatus can be improved.

  Positioning at the time of particle beam irradiation is usually performed by matching a digitally reconstructed radiograph (DRR) image, which is an image planned for treatment, from a CT image of the affected area and an X-ray image for positioning. This work is often performed manually by an engineer, but a technique for automatically performing this work has been proposed. In Patent Document 1, the position of the display marker displayed on the body surface is detected in real time, the affected part is estimated from the position of the marker, and the positional deviation between the center of the radiation isocenter and the affected part is obtained, and this positional deviation is predetermined. A technique for controlling the irradiation apparatus and the treatment table so as to obtain values is described. In Patent Document 2, the distance between a specific reference position on the treatment table and the isocenter of the radiotherapy apparatus and the distance between the specific reference position on the treatment table and the center of the measurement space of the MRI apparatus are added. A technique is described in which the center position of the affected area is automatically aligned with the isocenter of the gantry of the radiotherapy apparatus in a configuration in which is constant. Patent Document 3 describes a technique for omitting the input of calculation points when positioning a treatment table on a DRR image and transferring and displaying the calculation points set on the DRR image on the DR image.

Japanese Patent Laid-Open No. 11-47290 Japanese Patent Laid-Open No. 11-9708 JP 2008-228966 A

In the method described in Patent Document 1, positioning is performed based on the position of the display marker, and it cannot be automatically adjusted to the isocenter of the positioning device from CT image capturing. The method described in Patent Document 2 is based on the premise that the MRI apparatus is fixed, and cannot be applied to a configuration in which a self-propelled CT apparatus is used and a treatment table operates on the self-propelled CT apparatus side. Further, in the method described in Patent Document 3, the input of calculation points can be omitted, but it cannot be automatically adjusted to the isocenter of the positioning device from CT image capturing.

  The present invention has been made to solve the above-described problems, and uses a self-propelled CT apparatus, and a treatment table on which a patient is placed at the time of CT image photography is also freely movable toward the self-propelled CT apparatus. An object of the present invention is to obtain a treatment table positioning device of a particle beam therapy system that can be automatically adjusted to the isocenter of a positioning device from CT image capturing.

  The treatment table positioning device of the particle beam therapy system according to the present invention fixes a self-propelled CT that freely travels and a patient that captures a CT image by the self-propelled CT, and translates them to three orthogonal axes. A CT treatment table having a three-axis position setting mechanism for setting a position, an X-ray imaging apparatus installed separately from the self-propelled CT, and an X-ray image of a patient by the X-ray imaging apparatus A positioning treatment table having a three-axis position setting mechanism that fixes a patient and translates them into three orthogonal axes to set a position, a CT treatment table position setting mechanism, and a positioning treatment table position setting mechanism are controlled. A treatment table positioning device of a particle beam therapy system comprising a controller, wherein the controller includes position information of a CT isocenter, which is a fixed position with respect to the self-propelled CT, and X-ray imaging. And a relative current position that is a relative position of the CT treatment table with respect to the CT isocenter when a CT image is captured by self-propelled CT. The position setting mechanism of the positioning treatment table is controlled by storing and calculating the relative position of the positioning treatment table with respect to the positioning isocenter to be the same as the relative current position.

  The present invention uses a self-propelled CT apparatus and the treatment table moves freely to the self-propelled CT apparatus side, and positioning treatment is performed from the position of the CT treatment table at the time of CT image photographing and the position of the self-propelled CT apparatus By calculating and setting the setting value of the table, the positioning of the positioning isocenter is automated, the time required for the simulation is shortened, and the treatment table can be positioned efficiently.

It is a figure which shows the outline | summary of the treatment table positioning device of the particle beam therapy system by Embodiment 1 of this invention. It is a figure which shows an example of the DRR image used for the treatment table positioning device of the particle beam therapy system according to the first embodiment of the present invention. It is a flowchart figure explaining the detail of operation | movement of the treatment table positioning device of the particle beam therapy system by Embodiment 1 of this invention. It is a side view which shows the coordinate relationship of self-propelled CT by Embodiment 1 of this invention. It is a side view which shows the coordinate relationship of the X-ray imaging device by Embodiment 1 of this invention. It is a figure which shows the outline | summary of the treatment table positioning device of the particle beam therapy system by Embodiment 2 of this invention. It is a figure which shows the outline | summary of the treatment table positioning device of the particle beam therapy system by Embodiment 3 of this invention. It is a figure which shows the outline | summary of the treatment table positioning device of the particle beam therapy system by Embodiment 4 of this invention. It is a figure which shows the outline | summary of the treatment table positioning device of the particle beam therapy system by Embodiment 5 of this invention. It is a figure which shows the outline | summary of the treatment table positioning device of the particle beam therapy system by Embodiment 6 of this invention. It is a figure which shows the outline | summary of the treatment table positioning device of the particle beam therapy system by Embodiment 7 of this invention.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an outline of a treatment table positioning device of a particle beam therapy system according to Embodiment 1 of the present invention. The treatment room 101 is roughly divided into a CT side (the right half in FIG. 1) and a positioning device side (the left half in FIG. 1). On the CT side, there is a self-propelled CT 102 that includes a CT laser pointer 107 and can run freely, and this moves toward a CT treatment table 105 in which the patient 103 is fixed by a fixture 104. The CT treatment table 105 includes a position setting mechanism (provided in the CT treatment table 105) for translational movement in the front, rear, left, and right, and up and down, and a three-axis tilt setting mechanism for rotation of the three axes. The position and inclination are set by (provided in the CT treatment table 105). The CT isocenter 106 is a position serving as a reference for a captured image of the self-propelled CT 102 and is a position fixed with respect to the self-propelled CT 102. The position of the normal CT isocenter 106 is visualized by indicating with a CT laser pointer 107 fixed to the self-propelled CT.

  An X-ray imaging device 108 is provided on the positioning device side, and has a function of taking X-ray images of the patient 103 in the forward direction and the lateral direction. That is, the self-propelled CT 102 and the X-ray imaging apparatus 108 are installed apart from each other. X-ray imaging devices 108 are arranged on the top and bottom and right and left of the positioning treatment table 109, and X-ray images in both directions on the positive side of the patient 103 fixed by the fixing device 104 are simultaneously used. As with the CT treatment table 105, the positioning treatment table 109 has a position setting mechanism (provided in the positioning treatment table 109) that performs three-axis translation, and a three-axis tilt setting mechanism (positioning that rotates three axes). The position and inclination are set by the treatment table 109). The positioning isocenter 110 is a position serving as a reference for the captured image of the X-ray imaging apparatus 108, and is visualized by indicating the positioning isocenter 110 with a plurality of positioning laser pointers 111 normally provided on the wall surface of the treatment room 101 or the like.

The controller 112 is a device that controls the CT treatment table 105 and the positioning treatment table 109. The treatment planning device 113 is connected to the self-propelled CT 102, the positioning treatment table 109, and the controller 112. The treatment planning device 113 receives a CT image 201 as shown in FIG. It has a function to transmit to the controller 112 the coordinates of the treatment isocenter 204 with the isocenter 202 as the origin and the DRR image (Digital Reconstruction Radiograph, an image obtained by adding the three-dimensional CT image 201 in the positive direction or the side direction and performing two-dimensional conversion). ing. After placing the patient on the positioning treatment table 109, it is necessary to move the positioning treatment table 109 so that the position corresponding to the CT isocenter 202 of the CT image 201 matches the positioning isocenter 110. The DRR image is used to confirm whether or not the positioning is correctly performed in comparison with the X-ray image during the positioning operation.

  FIG. 2 is a diagram showing the positional relationship between the CT image and the coordinates. A CT isocenter 202 and an affected area 203 are present in the CT image 201 captured by the self-propelled CT 102. The CT isocenter 202 in the image is a point corresponding to the CT isocenter 106 on the actual apparatus in the captured image. The CT isocenter 202 does not actually exist in the captured image, but is a fixed point with respect to the self-propelled CT. As data for displaying as a point on the image, the self-propelled CT is separated from the image. This is added to the image data and output. The affected part 203 is a tumor such as cancer. The user of the treatment table positioning device determines the treatment isocenter 204 using the treatment planning device 113. The particle beam needs to be irradiated toward the treatment isocenter 204. The treatment isocenter 204 is expressed by coordinates with the CT isocenter 202 in the image as the origin.

  As described above, in the CT image 201 photographed by the self-propelled CT 102, the treatment isocenter 204 is determined with the CT isocenter 202 as the origin, and a treatment plan is created. For this reason, when the patient is fixed to the positioning treatment table 109, it is necessary to set the position of the positioning isocenter 110 serving as the reference position in the treatment to a position corresponding to the treatment isocenter 204.

  In the first embodiment, the controller 112 is provided with a treatment table position saving button 401 and a treatment table position reading button 402. Further, the controller 112 stores position information of the CT isocenter 106 and position information of the positioning isocenter 110 with respect to the self-propelled CT. When the treatment table position saving button 401 is pressed, the relative current position of the CT treatment table 105 with respect to the CT isocenter 106 is saved in the controller 112. When the treatment table position reading button 402 is pressed, the position of the positioning treatment table 109 is set so that the relative position of the positioning treatment table 109 with respect to the positioning isocenter 110 is the same as the stored relative current position of the CT treatment table 105. The setting value of the mechanism is calculated, and the position setting mechanism of the positioning treatment table 109 is controlled to set the position of the positioning treatment table.

  The procedure from CT image capturing to X-ray image capturing will be described with reference to the flowchart of FIG. First, the patient 103 is placed on the CT treatment table 105 (S302). Next, the CT treatment table 105 is moved to a position where the affected part 203 can be photographed (S303). Thereafter, the self-propelled CT 102 is moved (S304).

The position of the CT laser pointer 107 is confirmed by looking at the position of the CT laser pointer 107 to confirm that the affected part 203 can be imaged, and the position of the CT laser pointer 107 is marked on the fixture 104 as being the position of the CT isocenter 106 (S305). (This procedure is not essential, but it is useful to later visually confirm that the marking fits the positioning isocenter 110.)
. Thereafter, the treatment table position save button 401 is pressed, and the controller 112 acquires the position information of the self-propelled CT from the self-propelled CT 102 and the position information of the CT treatment table from the position setting mechanism of the CT treatment table 105, The relative current position, which is the relative position of the CT treatment table 105 with respect to the CT isocenter 106, is calculated and stored (S306).

The CT image 201 is taken and transmitted to the treatment planning device 113 (S307). A treatment isocenter 204 is determined from the affected part 203 in the CT image 201 by the treatment planning device 113. In addition, the treatment planning apparatus 113 generates a DRR image from the CT image 201 (S308).
The treatment planning apparatus 113 transmits the coordinates of the treatment isocenter 204 with the CT isocenter 202 in the image as the origin and the DRR image to the controller 112 (S309), and the controller 112 stores these information.

  Thereafter, the patient 103 is lowered from the CT treatment table 105 and placed on the positioning treatment table 109 (S310). The CT treatment table 105 and the positioning treatment table 109 are provided with holes for fixing the fixture 104. The fixture 104 is prepared according to the patient 103, and the CT fixture 105 and the positioning treatment table 109 use the same fixture 104. The patient 103 can be fixed at the same position on the positioning treatment table 109 as the position on the CT treatment table 105 by fixing the fixture 104 using a hole for fixing at each treatment table.

  Next, by pressing the treatment table position reading button 402 of the controller 112, the controller 112 reads the relative current position stored at the time of CT imaging, and the relative position of the positioning treatment table with respect to the positioning isocenter is the relative current position. The position setting mechanism is controlled to move the positioning treatment table 109 (S311). Here, the marking of the fixture 104 is aligned with the positioning isocenter 110. Further, the positioning treatment table 109 is moved by the coordinates of the treatment isocenter 204 stored by the controller 112 (S312).

After the movement is completed, an X-ray image is taken (S313). D transmitted from the treatment planning device 113
The RR image and the X-ray image are compared to determine whether the positional deviation is within an allowable range (S314). As a result of the comparison, if the deviation is outside the allowable range, the process proceeds to S315. If it is within the allowable range, the process ends (S316). If the deviation is outside the allowable range, the position of the positioning treatment table 109 is finely adjusted, and the process proceeds to S313 (S315).

  Here, the position setting method of the positioning treatment table 109 will be described in detail. FIG. 4 is a side view showing the coordinate relationship between the self-propelled CT 102 and the CT treatment table 105. In this figure, the origin of the CT treatment table 105 is (Xa0, Ya0, Za0). The coordinates of the CT treatment table 105 (reference position) at the time of CT image photographing are (Xa1, Ya1, Za1). The coordinates in the real space of the CT isocenter 106 at this time are assumed to be (Xa2, Ya2, Za2). A difference between the X coordinates of the CT isocenter 106 and the CT treatment table 105 (relative position of the CT treatment table 105 with respect to the CT isocenter 106) is defined as Da1. A difference between the Z coordinates of the CT isocenter 106 and the CT treatment table 105 (relative position of the CT treatment table with respect to the CT isocenter 106) is defined as Da2.

FIG. 5 is a side view showing the coordinate relationship between the X-ray imaging apparatus and the positioning treatment table 109. In this figure, the origin of the positioning treatment table 109 is (Xb0, Yb0, Zb0). The coordinates of the positioning treatment table 109 to be set at the time of positioning are set to (Xb1, Yb1, Zb1). The coordinates of the positioning isocenter 110 are (Xb2, Yb2, Zb2). Let A be the difference between the origin of the positioning treatment table 109 (reference position) and the X coordinate of the positioning isocenter 110. Since the origin of the positioning treatment table 109 and the positioning isocenter 110 are fixed points, A is a fixed value. Also, the difference between the X coordinates of the positioning isocenter 110 and the positioning treatment table 109 (the relative position in the X direction of the positioning treatment table 109 with respect to the positioning isocenter 110) is defined as Db1. The difference between the Z coordinate of the positioning isocenter 110 and the positioning treatment table 109 (the relative position in the Z direction of the positioning treatment table 109 with respect to the positioning isocenter 110) is defined as Db2. Since the patient 103 is placed on the positioning treatment table 109 at the same position as the CT treatment table 105, it is necessary to set the position of the positioning treatment table 109 so that Da1 and Db1 and Da2 and Db2 coincide.

  As an example, consider a case where CT is imaged after moving the CT treatment table 105 to the self-propelled CT 102 side. In this case, since the CT imaging position is not determined, the current value of the axis of the CT treatment table 105 in the direction of the self-propelled CT 102 cannot be used as the set value of the axis of the positioning treatment table 109 as it is. Therefore, it is necessary to calculate where the CT isocenter 106 is located on the CT treatment table 105 from the relative distance between the CT treatment table 105 and the self-propelled CT 102, and to calculate the position of the positioning treatment table 109 to be set based on that. There is. An attempt is made to calculate the X coordinate Xb1 of the positioning treatment table 109 to be specifically set. First, from FIG. 4, Da1 = Xa2−Xa1. From FIG. 5, Xb1 = A−Db1 = A−Da1 = A− (Xa2−Xa1).

A is the position of the positioning isocenter and is stored in the controller. (Xa2-Xa1)
Is the relative position of the CT treatment table 105 with respect to the CT isocenter 106 when the CT image is taken (this is referred to as a relative current position), and it can be seen that the relative position of the positioning treatment table 109 with respect to the positioning isocenter 110 can be calculated. . Since the X-ray imaging apparatus 108 is installed at a fixed position in the treatment room 101, the position of the positioning isocenter 110 is fixed. Therefore, when the relative position of the positioning treatment table 109 with respect to the positioning isocenter 110 is calculated, the position of the positioning treatment table 109 with respect to the treatment room 101 is determined.

As described above, in the present invention, the relative current position that is the relative position of the CT treatment table 105 with respect to the CT isocenter 106 when the CT image is captured by the self-propelled CT 102 (corresponding to Da1 in the above X coordinate example). ), The relative position of the positioning treatment table 109 with respect to the positioning isocenter 110 (corresponding to Db1 in the above X coordinate example) is calculated to be the same as the relative current position, and the position setting of the positioning treatment table 109 is performed. Control the mechanism. More specifically, C
Since the position (coordinates) (Xa2, Ya2, Za2) of the T isocenter 106 is a position fixed with respect to the self-propelled CT, the position of the CT isocenter 106 is determined from the position of the self-propelled CT when the CT image is captured. You can know the position (coordinates) (Xa2, Ya2, Za2). Alternatively, the position of the self-propelled CT can be represented by the position of the CT isocenter. In any case, the relative current position, which is the relative position of the CT treatment table 105 with respect to the CT isocenter 106, can be obtained from the position of the self-propelled CT 102 and the position of the CT treatment table 105.

Next, consider a case where the CT isocenter 106 and the positioning isocenter 110 have different fixed heights. It is necessary to add the difference in height between the CT isocenter 106 and the positioning isocenter 110 to the current value of the vertical axis of the CT treatment table 105 to correct the difference in height. Specifically, calculation of the Z coordinate Zb1 of the positioning treatment table 109 is attempted. First, CT isocenter 10
6 and B = Zb2−Za2 where B is the height difference between the positioning isocenter 110 and B. From FIG. 4, Da2 = Za2−Za1. From FIG. 5, Db2 = Zb2−Zb1. By transforming this equation, Zb1 = Zb2-Db2 = Zb2-Da2 = Zb2-Za2 + Za1 = B + Za1.

Further, when the positions in the Y direction are different, the calculation can be performed in the same manner as described above.
Of the six axes that set the positions of both treatment tables, with respect to the three axes of rotation, that is, the tilt setting mechanism that sets the tilt, the tilt of the positioning treatment table 109 is that of the CT treatment table 105 at the time of CT image capturing. The tilt setting mechanism of the positioning treatment table 109 is set to be the same as the tilt. That is, the setting value of the tilt setting mechanism of the positioning treatment table is set to be the set value of the tilt setting mechanism of the CT treatment table at the time of CT image capturing. Since it is ensured that the inclination is the same, alignment can be performed with three axes of translation.

  In this way, the relative current position, which is the relative position of the CT treatment table 105 with respect to the CT isocenter 106 at the time of CT imaging, is stored, and the positioning treatment table 109 for the positioning isocenter 110 is used using the relative current position. The time required for the simulation is shortened by calculating the relative position of the positioning is the same as the current relative position, controlling the position setting mechanism of the positioning treatment table 109, and automating the positioning of the positioning isocenter 110. , The treatment table can be positioned efficiently.

Embodiment 2. FIG.
In the first embodiment, two treatment tables, the CT treatment table 105 and the positioning treatment table 109, are used, and the burden on the patient is large because the patient has got on and off the treatment table by CT imaging and X-ray imaging. It was.

  In order to deal with this problem, as shown in FIG. 6, a rotary type common treatment table 701 mounted on a turntable 702 is introduced. First, a rotating shared treatment table 701 is fixed to the self-propelled CT 102 side and a CT image is taken. At this time, the rotary type common treatment table 701 is a treatment table corresponding to the CT treatment table of the first embodiment. Thereafter, the turntable 702 on which the rotary type common treatment table 701 is mounted is rotated. That is, the rotary type common treatment table 701 is moved from the CT image capturing position to the X-ray image capturing position while the patient 103 is placed. At this time, the rotary type common treatment table 701 is a treatment table corresponding to the positioning treatment table of the first embodiment. Further, the X-ray imaging apparatus 108 can be appropriately retracted so as not to collide with the rotary shared treatment table 701 when the rotary shared treatment table 701 is moved.

  Also in the second embodiment, the X-ray imaging apparatus side uses the relative current position, which is the relative position of the rotary shared treatment table 701 with respect to the CT isocenter 106 when the CT image is captured by the self-propelled CT 102. The position setting mechanism of the rotary type common treatment table 701 is controlled by calculating so that the relative position of the rotary type common treatment table 701 moved to the position relative to the positioning isocenter 110 is the same as the relative current position.

  Here, the rotation type common treatment table 701 rotates in the treatment room 101, but the positional relationship between the rotation type common treatment table 701 and the self-propelled CT 102 at the time of CT imaging, and the rotation type common treatment table 701 at the time of X-ray image photography. The positional relationship of the X-ray imaging apparatus 108 is the same as in the first embodiment. Therefore, the coordinate system and calculation method described in Embodiment 1 can be applied as they are.

  In this way, CT imaging and X-ray imaging can be performed without the patient 103 getting on and off the treatment table, reducing the burden on the patient and shortening the positioning time of the treatment table.

Embodiment 3 FIG.
In the second embodiment, since the simple turntable 702 is used, the large treatment room 101 is necessary so that the rotary type common treatment table 701 does not collide with the wall surface.

  In order to deal with this problem, as shown in FIG. 7, a rotary type common treatment table 801 with an eccentric shaft is introduced. The rotation type common treatment table 801 with the eccentric shaft can rotate 180 degrees about the eccentric shaft 802. When moving the rotary shared treatment table with an eccentric shaft 801 from the CT image photographing position to the X-ray image photographing position, the rotary table 801 is first rotated 180 degrees around the eccentric shaft 802 and then the turntable 702 is rotated.

  Also in the third embodiment, an X-ray is obtained by using a relative current position that is a relative position of the rotary type common treatment table 801 with the eccentric shaft with respect to the CT isocenter 106 when a CT image is captured by the self-propelled CT 102. The relative position of the rotary shared treatment table 801 with the eccentric shaft relative to the positioning isocenter 110 of the rotary shared treatment table 801 with the eccentric shaft moved to the imaging device side is calculated to be the same as the relative current position, and the eccentric shaft The position setting mechanism of the attached rotary type common treatment table 801 is controlled.

Also in this case, as in the second embodiment, the rotation type shared treatment table 801 with the eccentric shaft rotates in the treatment room 101, but the positional relationship between the rotation type common treatment table 801 with the eccentric shaft and the self-propelled CT 102 at the time of CT imaging. The positional relationship between the rotary shared treatment table with an eccentric shaft 801 and the X-ray imaging apparatus 108 at the time of X-ray imaging is the same as that of the first embodiment. Therefore, the coordinate system and calculation method described in Embodiment 1 can be applied as they are.

  In this way, the rotary shared treatment table 801 with the eccentric shaft can be moved compactly from the CT image photographing position to the X-ray image photographing position, and the space of the treatment room 101 necessary for installing the treatment table is reduced. Can be reduced.

Embodiment 4 FIG.
In the second to third embodiments, since the treatment table rotates, the patient 103 who is riding tends to feel bad depending on the manner of operation.

  In order to deal with this problem, as shown in FIG. 8, a translational shared treatment table 901 riding on a rail 902 is introduced. The translational common treatment table 901 translates on the rail 902 to obtain a CT image imaging position (at this time, the translational common treatment table 901 is a treatment table corresponding to the CT treatment table of the first embodiment). The position can be moved to the X-ray imaging position (in this case, the translational common treatment table 901 is a treatment table corresponding to the positioning treatment table of the first embodiment). In this way, the rotating operation can be avoided, and the patient can be prevented from feeling unwell.

Also in the fourth embodiment, the X-ray imaging apparatus side uses the relative current position that is the relative position of the translational common treatment table 901 with respect to the CT isocenter 106 when the CT image is captured by the self-propelled CT 102. Isocenter 11 of translational common treatment table 901 moved to
The position setting mechanism of the translation type common treatment table 901 is controlled by calculating so that the relative position of the translation type common treatment table 901 with respect to 0 is the same as the relative current position.

  In this case as well, as in the second embodiment, the translational common treatment table 901 moves within the treatment room 101, but the positional relationship between the translational common treatment table 901 and the self-propelled CT102 during CT imaging, and during X-ray image photography The positional relationship between the translational common treatment table 901 and the X-ray imaging apparatus 108 is the same as that in the first embodiment. Therefore, the coordinate system and calculation method described in Embodiment 1 can be applied as they are.

Embodiment 5 FIG.
In the first to fourth embodiments, the treatment table position saving button 401 is manually pressed to save the relative current position and inclination of the CT treatment table 105 at the time of CT imaging. .

  To deal with this problem, the treatment table position saving button 401 is removed as shown in FIG. 9, and the controller 112 automatically saves the relative current position and inclination of the CT treatment table 105 using the CT imaging signal of the self-propelled CT 102 as a trigger. To do.

  In this way, the relative current position and inclination of the CT treatment table 105 can be automatically stored in the controller 112, so that it is possible to prevent forgetting to push manually, and the treatment table can be more reliably and efficiently used. Positioning is possible.

Embodiment 6 FIG.
In the first to fifth embodiments, the position setting mechanism of the positioning treatment table 109 is set by manually pressing the treatment table position reading button 402. This button must be pressed manually.

  In order to deal with this problem, the treatment table position reading button 402 is removed as shown in FIG. 10, and the controller 112 automatically performs the positioning treatment using the mounting of the fixture 104 on the positioning treatment table 109 described in the first embodiment as a trigger. The position setting mechanism of the base 109 is set.

  In this way, manual button operations can be reduced, and the treatment table can be positioned more efficiently.

Embodiment 7 FIG.
In the first to sixth embodiments, the positioning treatment table 109 is first moved until the CT isocenter 106 coincides with the positioning isocenter 110, and then the procedure divided into two steps is performed, which is the amount corresponding to the coordinates of the treatment isocenter 204. It was.

  To deal with this problem, as shown in FIG. 11, the treatment table position + treatment isocenter position reading button 1201 is attached, and the treatment table position + treatment isocenter position reading button 1201 is pressed, so that the controller 112 stores the relative stored before CT imaging. The positioning treatment table 109 is set so that the position obtained by adding the coordinate of the treatment isocenter 204 transmitted from the treatment planning device 113 to the relative current position is set as the position of the positioning treatment table 109 relative to the positioning isocenter 110. Controls the position setting mechanism.

  In this way, the procedure divided into two stages can be collectively operated, and the treatment table can be positioned more efficiently.

101: Treatment room 102: Self-propelled CT
103: Patient 104: Fixing tool 105: CT treatment table 106, 202: CT isocenter 108: X-ray imaging apparatus 109: Positioning treatment table 110: Positioning isocenter 112: Controller 201: CT image 204: Treatment isocenter 701, 801: Rotation type Common treatment table 702: Turntable 802: Eccentric shaft 901: Translation type common treatment table

Claims (9)

CT treatment having a self-propelled CT that freely travels, and a three-axis position setting mechanism that fixes a patient who captures a CT image by the self-propelled CT and that translates and sets a position in three orthogonal axes Stand,
An X-ray imaging device installed apart from the self-propelled CT, and the patient is fixed in order to capture the X-ray image of the patient by the X-ray imaging device, and is translated into three orthogonal axes. A positioning treatment table having a three-axis position setting mechanism for setting the position;
A controller for controlling the position setting mechanism of the CT treatment table and the position setting mechanism of the positioning treatment table;
In a treatment table positioning device of a particle beam therapy system comprising:
The controller has position information of a CT isocenter that is a fixed position with respect to the self-propelled CT, and position information of a positioning isocenter that is a fixed position with respect to the X-ray imaging apparatus, Stores the relative current position of the CT treatment table relative to the CT isocenter when a CT image is captured by self-propelled CT, and stores the relative position of the positioning treatment table relative to the positioning isocenter A treatment table positioning device for a particle beam therapy system, wherein the position setting mechanism of the positioning treatment table is controlled by calculating so as to be the same as the relative current position.   2. The treatment table positioning device for a particle beam therapy system according to claim 1, wherein the position information of the CT isocenter when the CT image is captured is obtained from the position of the self-propelled CT when the CT image is captured.   When the rotary type common treatment table is installed on the turntable, and the rotary type common treatment table is in the vicinity of the self-propelled CT, the rotary type common treatment table becomes the CT treatment table, and the turntable rotates to rotate the common type. The treatment table positioning apparatus of the particle beam therapy system according to claim 1, wherein when the treatment table is moved to the X-ray imaging apparatus side, the rotary type common treatment table becomes a positioning treatment table.   The treatment table positioning device of the particle beam therapy system according to claim 3, wherein the rotary type common treatment table is installed on a turntable by a rotatable eccentric shaft.   When the translation type common treatment table is installed on the rail, and the translation type common treatment table is in the vicinity of the self-propelled CT, the translation type common treatment table becomes a CT treatment table, and the translation type common treatment table moves on the rail. 2. The treatment table positioning device of the particle beam therapy system according to claim 1, wherein the translational shared treatment table becomes a positioning treatment table when moved to the X-ray imaging apparatus side.   Each of the CT treatment table and the positioning treatment table has a three-axis inclination setting mechanism that rotates and sets the inclination, and the controller sets the inclination of the CT treatment table when a CT image is captured by the self-propelled CT. The control value is stored, and control is performed such that the setting value of the tilt setting mechanism of the positioning treatment table becomes the set value of the stored tilt setting mechanism of the CT treatment table. A treatment table positioning device of the particle beam therapy system according to Item.   The treatment table positioning device for a particle beam therapy system according to any one of claims 1 to 6, wherein the controller stores a relative current position by using an imaging signal of a CT image of self-propelled CT as a trigger.   The positioning treatment table includes a fixture for fixing the patient, and the controller controls the position setting mechanism of the positioning treatment table using a patient wearing signal that fixes the patient with the fixture as a trigger. A treatment table positioning device of the particle beam therapy system described.   9. The controller according to claim 1, wherein the controller controls the position setting mechanism of the positioning treatment table by adding the coordinates of the treatment isocenter, which is a treatment reference position with the CT isocenter as the origin, to the stored relative current position. A treatment table positioning device for a particle beam therapy system according to claim 1.

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