JPH10201864A - Radiotherapy system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the correction of position deviation accompanied with movement by correcting a position to be irradiated with radiations by calculating the position deviation of a subject caused by movement from a mark position measured by a position measuring means at the time of image pickup and a mark position measured after the movement of the subject. SOLUTION: When the image pickup of a subject 4 is finished, before taking the subject 4 down from a photographic table 5, a mark 20 is described at a prescribed position on the surface of the body of the subject 4 such as any arbitrary position where respiratory body motion is small, for example. The position of the mark 20 is measured by flood lamps 2 and 3 and stored in a 1st storage means 9. When placing the subject 4 on the photographic table 5 again, the mark 20 is made coincident with the laser beams of flood lamps 2 and 3 and the positions of the flood lamps 2 and 3 are measured and stored in a 2nd storage means 10. In this case, when a console 8 is manipulated and laser light irradiation at the radiation irradiation position stored in a 3rd storage means 11 is instructed, the position deviation is found from the position data in the storage means 9 and 10 and the position is corrected by an arithmetic means 12. Thus, the exact position is irradiated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiotherapy system and, more particularly, to a technique effective when applied to a radiotherapy planning apparatus using an X-ray CT apparatus.

[0002]

2. Description of the Related Art A conventional radiotherapy system reconstructs a CT image as a tomographic image or a three-dimensional image of an object from an X-ray projection image obtained by imaging the object, and based on the CT image, reconstructs the CT image. A radiation treatment planning device that creates a radiation treatment plan (hereinafter referred to as a treatment planning device) and a radiation treatment device that actually irradiates a subject with radiation based on the treatment plan (hereinafter referred to as a treatment device) Was composed.

[0003] The treatment planning device and the treatment device are, for example,
It is connected by a communication line such as RS-232C or Ethernet, and information about the treatment plan determined by the treatment planning device is transferred to the treatment device via this communication line. The treatment plan information at this time was the size of the irradiation area, the irradiation angle of the radiation, and the like.

On the other hand, regarding the irradiation position of radiation, first, a laser beam is applied to the body surface of the subject from a light projecting device provided at the opening of the scanner of the treatment planning apparatus, for example, to the irradiation position. I do. Next, the examiner marked the irradiation position by marking a mark indicating the radiation irradiation position on the body surface where the laser light was applied.

[0005] Next, in the treatment apparatus, the irradiation position of the radiation is determined by making the laser light provided on the radiation irradiation head portion coincide with the mark, and the mark is transferred from the treatment planning apparatus via a communication line. The size of the irradiated area and the irradiation angle were determined.

[0006] On the other hand, in a conventional treatment planning apparatus of a radiotherapy system, a mark indicating a subject position and a radiation irradiation position at the time of capturing an X-ray projection image of a subject is marked on the body surface of the subject. Position must match,
For this reason, it is necessary to hold the subject position set on the imaging table.

[0007] However, the imaging table of the conventional treatment planning apparatus is required to secure the X-ray transparency, to secure the strength of holding the subject, and to eliminate the fluctuation of the position of the subject on the imaging table. The platform was made of a rigid material such as veneer plywood or carbon reinforced resin, and was not comfortable for the subject. In addition, treatment planning in cases such as cancer not only requires a lot of time, but the subject in such a case suffers from the pain of maintaining the posture itself during imaging, so once lowered from the imaging table, When the treatment plan was completed and a mark was to be written on the body surface of the subject, the subject was set on the imaging table again.

[0008]

SUMMARY OF THE INVENTION As a result of studying the above prior art, the present inventor has found the following problems.

In a conventional treatment planning apparatus of a radiotherapy system, when a subject once dropped from an imaging table is returned to the imaging table again, a mark for accurately irradiating the body surface of the subject with X-rays is marked. In addition, it is necessary to accurately return the subject to the imaging position of the X-ray projection image. For this purpose, the light projecting position from the light projecting device, that is, the irradiation position of the laser light is set to a predetermined position, and a mark for positioning is marked on the surface of the subject irradiated with the laser light, and then the subject is photographed. Remove from the platform.
When the subject is set on the imaging table again, the X-ray projection is performed by setting the subject on the fluoroscopic imaging table so that the alignment mark and the position of the laser beam from the light projecting device coincide with each other. The position of the subject at the time of capturing the image and the time of writing the mark indicating the radiation irradiation position after the treatment plan were matched.

However, the position of the subject after the reloading is X
In order to return the subject to the position at the time of capturing the line projection image, labor for moving the subject on the imaging table is required, so that there is a problem that a large number of workers are required.

Further, in order to maximize the therapeutic effect of the treatment apparatus, it is necessary to perform this positioning accuracy as high as possible, so that there is a problem that it takes a long time to perform the positioning. For this reason, there is a problem that a series of flows of the radiation treatment planning by the treatment planning device and the radiation treatment by the treatment device takes time, and the diagnostic efficiency of the radiation treatment system is reduced.

Furthermore, in this case, since the subject itself moves or moves on the imaging table, the subject suffers from the movement.

As a method for solving the above problem, it is conceivable to move the position of the subject by moving the imaging table on which the subject is set. In this case, CT
Since the imaging table of the apparatus is intended to move the subject in the front-back direction, which is the body axis direction, to move the subject in the left-right direction, which is the direction perpendicular to the body axis, the imaging table A new moving mechanism for performing the movement in the left-right direction is required, and there is a problem that the manufacturing cost of the apparatus increases.

Further, even when a moving mechanism for moving the imaging table to the left and right is provided, there is a problem that the movable range of the imaging table is limited to the opening range of the scanner.

An object of the present invention is to easily shift the position of a subject after re-mounting and the position of the subject at the time of imaging when the subject is dropped from the imaging table during the period during which a radiation treatment plan is being made. It is to provide a radiotherapy system that can be modified.

Another object of the present invention is to provide a method for measuring the position of a subject after resetting, when the subject is once lowered from the imaging table, between the time of measurement of the subject and the time of marking after the end of the treatment plan. It is an object of the present invention to provide a radiotherapy system capable of shortening the time required for positioning with the subject position.

Another object of the present invention is to provide a method for measuring the position of a subject after resetting and measuring the position of the subject when the subject is once lowered from the imaging table between the time of measurement of the subject and the time of marking after the end of the treatment plan. It is an object of the present invention to provide a radiotherapy system capable of reducing the pain of a subject due to the alignment with the subject position.

Another object of the present invention is to provide a radiotherapy system capable of improving diagnostic efficiency.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0020]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

(1) After capturing a projected image of the subject set on the imaging table, a tomographic image or a three-dimensional image is formed from the projected image, and the subject is formed based on the tomographic image or the three-dimensional image. A radiation treatment planning device for drafting an irradiation plan of radiation to be irradiated, wherein the radiation treatment planning device irradiates laser light to a laser beam on a body surface of a subject, and the laser based on an examiner's support. Supporting and moving means for supporting the light irradiation means and moving it to a predetermined position; position measuring means for measuring the position of the laser light irradiation means; and applying the laser light to a positioning mark written on the subject at the time of imaging. The displacement of the subject due to the movement is calculated from the mark position measured by the position measuring means in combination with the laser beam of the means and the mark position measured after moving the subject, and determined in the treatment plan. Is the radiation irradiation position that includes the irradiation position correcting means for correcting.

(2) The radiation treatment planning apparatus described in (1) above, which is connected to the radiation treatment planning apparatus via a communication line, and the radiation irradiation conditions obtained through the communication line and the radiation exposure condition of the subject. A radiation treatment system having a radiation treatment device that performs radiation treatment based on a radiation irradiation position mark written on a body surface.

According to the above-mentioned means, for example, the subject is temporarily lowered from the imaging stand of the radiation treatment planning apparatus while the treatment plan is being prepared by the radiation treatment planning apparatus,
After the treatment plan is determined, when the subject is set (mounted) on the imaging table again and a mark for radiation treatment is to be marked,
After the imaging is completed, a positioning mark is written on the body surface of the subject, the laser light irradiated from the laser light irradiating means is aligned with the mark position, and the coordinate position is measured by the position measuring means.

Next, after the subject is lowered from the imaging table, a tomographic image or a three-dimensional image is reconstructed from the projection image. Plan and determine the irradiation position, etc.

Once the radiation treatment plan has been completed,
The subject is set on the imaging table, and then the laser light irradiated from the laser light irradiating means is aligned with the mark position, and the coordinate position is measured by the position measuring means, so that the position of the subject at the time of remounting can be determined. Measure. Thereafter, when the examiner instructs the radiation treatment planning apparatus to irradiate the laser irradiation position to the radiation irradiation position, the radiation irradiation position correction unit performs the operation when the coordinate position of the alignment mark at the time of imaging and the subject are remounted. From the coordinate position of the alignment mark, the displacement of the subject due to reloading is calculated. Next, the radiation irradiation position correction means, based on the deviation, after correcting the radiation irradiation position determined in the treatment plan, move the laser light irradiation means to the correction position,
Since the laser light is applied, it is not necessary to move the subject on the imaging table after remounting. Therefore, it is possible to reduce the number of workers including the examiner when making a treatment plan. In addition, since it is not necessary to move the subject on the imaging table, the pain of the subject can be reduced.

In addition, since the examiner's work involves only measuring the coordinate position of the laser beam irradiating means after the imaging of the projection image and after the mounting, the displacement accompanying the mounting of the subject can be easily corrected. Therefore, it is possible to reduce the time required for correcting the displacement due to the reloading of the subject.

That is, the radiation treatment plan in the radiation treatment system and the time required for radiation treatment based on the treatment plan can be shortened, so that the diagnostic efficiency can be improved.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings together with embodiments (examples) of the invention.

In all the drawings for describing the embodiments of the present invention, components having the same functions are denoted by the same reference numerals, and their repeated description will be omitted.

FIG. 1 is a block diagram showing a schematic configuration of a radiotherapy system according to an embodiment of the present invention, wherein 1 is a scanner, 2 is a first projector, 3 is a second projector, 4 is an object, Reference numeral 5 denotes an imaging table, 7 denotes a first communication line, 8 denotes a first console, 9 denotes a first storage unit, 10 denotes a second storage unit,
1 is a third storage unit, 12 is a calculation unit (radiation irradiation position correction unit), 20 is a positioning mark, 101 is a treatment gantry, 102 is an irradiation head, 104 is a positioning jig, 105 is a treatment table, 106 is a microtron main body,
Reference numeral 107 denotes a control device, 108 denotes a second console, 109 denotes a second communication line, 110 denotes a radiation treatment planning device, and 111 denotes a radiation treatment device.

Since the radiation therapy apparatus 111 shown in FIG. 1 is a well-known radiation therapy apparatus, detailed description will be omitted.

In FIG. 1, a scanner 1 is a well-known scanner having an X-ray tube device for irradiating X-rays, an X-ray detector facing the X-ray tube device, and a rotating mechanism thereof. An X-ray projection image of the subject at each rotation angle is captured, and the X-ray projection image is output to the first console.

The first projector 2 is a well-known laser light output device that irradiates a well-known laser beam to the subject 4 of the imaging table 5. In the present embodiment, the laser light output portion is particularly the scanner 1. For example, a laser output portion (laser beam irradiation) can be moved in a direction perpendicular to the body axis direction of the subject and parallel to the installation floor of the apparatus (hereinafter, referred to as an X-axis direction). Means), and a projector drive means for driving a laser output portion based on an examiner's instruction from an operation panel or a first console, which will be described later.
It has support moving means. In order to detect the amount of movement of the laser beam output portion, for example, a position measuring unit such as a well-known encoder is connected to the projector driving unit, and the encoder output controls the operation of the scanner 1 and the imaging table 5. It is connected to a scanner control device (not shown).

The basic configuration of the second projector 3 is the same as that of the first projector 2, but the direction of the guide rail (not shown), that is, the moving direction of the laser beam, is perpendicular to the body axis of the subject and the installation of the apparatus. The difference lies in the vertical direction (hereinafter referred to as the Y-axis direction) of the imaging table 5 which is perpendicular to the surface.

The imaging table 5 is a well-known imaging table, and includes a couch top on which the subject 4 is placed, a horizontal moving mechanism for moving the couch top in the body axis direction of the subject 4, and a couch top. And a vertical movement mechanism for moving the board in a direction perpendicular to the floor surface. In addition, the imaging table 5 moves the couch top in the vertical direction and the body axis direction of the subject (hereinafter, referred to as the Z-axis direction) based on an examiner's instruction from an operation panel or a first console described later. Can be moved.

The first communication line 7 is a communication line for connecting the first console 8 to a scanner control device (not shown), and is, for example, a well-known communication line such as RS-232C or Ethernet.

The first console 8 is a so-called well-known console with a built-in image processing apparatus, which has a computing means 12 for performing image processing for reconstructing a tomographic image and a three-dimensional image of a subject from measurement data. Yes, it has a well-known display means for displaying the image processing result.

The first storage means 9 is a known storage means, for example, a well-known semiconductor memory, a magnetic disk device or a magneto-optical disk device. The first storage unit 9 stores the coordinate position in the XYZ coordinate system of the alignment mark 20 written on the body surface before the subject 4 is lowered from the imaging table 5.

The second storage means 10 includes the first storage means 9
Similarly to the known storage means, for example, a known semiconductor memory, a magnetic disk device or a magneto-optical disk device is used. The second storage unit 10 stores the coordinate position of the alignment mark 20 in the XYZ coordinate system when the subject 4 is set again on the imaging table 5, that is, when the subject 4 is mounted again.

The third storage means 11 includes the first storage means 9
Similarly to the second storage unit 10, the storage unit is a well-known storage unit using, for example, a well-known semiconductor memory, a magnetic disk device, or a magneto-optical disk device. The third storage unit 11 stores the coordinate position in the XYZ coordinate system of the isocenter position IC in radiation irradiation determined in the radiation treatment plan.

The calculating means 12 is realized by, for example, a program operating on a well-known information processing device built in the console 8, and includes a first storing means 9 and a second storing means.
The displacement (displacement vector) of the subject 4 after the reloading is calculated from the coordinate values of the position of the alignment mark stored in the storage means 10 of FIG.

The treatment gantry 101 is a well-known treatment gantry, and includes an irradiation head 102 for irradiating an electron beam generated in the microtron main body 106 in a predetermined irradiation field, and an isocenter position I of the irradiation electron beam.
And a laser projector (not shown) for setting C.

The positioning jig 104 comprises a well-known fixing table, a fixing belt and a fixing mat, and is a jig for fixing the subject 4 so as not to move.

The treatment table 105 comprises an X-direction moving table, a Y-direction moving table, a Z-direction moving table, a lifting / lowering device, a treatment table support table, and a turntable. X in the coordinate system
It is moved three-dimensionally in the directions of the axis, the Y axis and the Z axis.

The microtron main body 106 is a well-known high-energy electron beam generator, although the internal mechanism is not disclosed.

The control device 107 is a well-known control device, and moves the treatment gantry 101 and the treatment table 105 and controls the microtron main body 106 based on the support of the examiner input from the second console 108. And do.

The second console 108 is an input device for inputting instructions from the examiner, and performs arithmetic processing based on the input data and, for example, a rotary encoder (for example, a rotary encoder) installed on the treatment gantry 101 and the treatment table 105. A display of the positions of the treatment gantry 101 and the treatment table 105 based on a signal from a position sensor (not shown) constituted by a detection means), and a current X-ray irradiation amount, etc.

The second communication line 109 connects the first console 8 which is the console of the radiation treatment planning apparatus 110 and the second console 108 which is the console of the radiation therapy apparatus 111. A communication line, for example, a well-known RS-
232C or Ethernet is used.

Next, the operation of the radiotherapy system according to the present embodiment will be described with reference to FIG. 1. First, an examiner (not shown) mounts the subject 4 on the imaging table 5 in an upright posture.
The bed top is raised to a predetermined height by the vertical movement mechanism of the imaging stand 5.

Next, when an instruction to capture a projection image of the subject 4 is given from the first console 8, the horizontal moving mechanism moves the couch top, ie, the subject 4, into the opening of the scanner 1.
Is started. The captured projection images of the subject 4 are sequentially sent to the console 8 via the first communication line, and stored in the projection image storage means (not shown) of the console 8. Note that the imaging operation is the same as that of the conventional X-ray CT apparatus, and thus the description is omitted.

When the imaging of the projection image of the subject 4 is completed, before the subject 4 is lowered from the imaging table 5, first, the examiner first moves the subject 4 to a predetermined position on the body surface of the subject, for example, a respiratory body movement. Write a mark 20 for alignment at a small arbitrary position,
This position is measured by the first or second projectors 2 and 3. The measurement position at this time is stored in the first storage means 9 via the first communication line 7.

When the position measurement of the positioning mark 20 is completed, the examiner once lowers the subject 4 from the imaging table 5 and places it on, for example, a stretcher to make a radiation treatment plan. At this time, information on the radiation irradiation position is stored in the third storage unit 11.

When the radiation treatment plan is completed, the examiner first reloads the subject 4 evacuated to the stretcher. Next, the alignment mark 20 written on the body surface of the subject 4 is matched with the laser beam emitted from the first or second projector 2, 3, and the projector position at this time is measured. This measured value is transferred to the console 8 via the first communication line 7 and stored in the second storage means 10.

Next, the examiner operates the console 8 to enter the third
Instruct the irradiation of the laser beam from the projector to the radiation irradiation position stored in the storage means 11. On the basis of this instruction, first, the calculating means 12 makes the first and second storing means 9, 10
The positional deviation of the subject 4 at the time of imaging and after remounting is calculated from the deviation of the positioning mark 20. Next, the calculating means 12
Irradiates a laser beam to a radiation irradiation position stored in the third storage unit 11 at a position where the displacement of the subject 4 is corrected. Here, the examiner writes a mark indicating the radiation irradiation position, that is, a radiation irradiation position mark at the position where the laser beam is irradiated, and the radiation treatment plan ends.

Next, the subject 4 is moved to the radiation therapy apparatus 111.
Is moved to the treatment table 105 for radiation treatment. However, in the present embodiment, the radiotherapy apparatus 111 is the same apparatus as the conventional radiotherapy apparatus, and the description is omitted.

The radiation irradiation position mark described above is
For example, it indicates the position of the isocenter of the radiation irradiated by the radiation therapy apparatus 111.

FIG. 2 is an enlarged view of a scanner portion of the radiation treatment planning apparatus according to the present embodiment, and FIG. 2A is a diagram when the scanner portion is viewed from the side of the subject. FIG. 2B is a diagram when the scanner portion is viewed from the direction of the body axis of the subject (in particular, the direction of the feet).

In FIG. 2, reference numeral 6 denotes an operation panel. The operation panel 6 is a first operation panel installed on the side of the scanner 1.
And the second projectors 2 and 3 are installed on the same side surface. The operation panel 6 includes, for example, a light emitting device 2 (not shown).
3 is controlled.

Next, FIG. 3 is a view for explaining a positioning procedure in the radiation treatment planning apparatus according to the present embodiment. Hereinafter, based on FIG. 3, the object to be examined by the CT apparatus shown in FIG. The alignment procedure will be described.

In the following description, a case will be described in which only one mark 20 for positioning is provided on the body surface of the subject 4.

When the X-ray photography by the CT device is completed,
As shown in FIG. 3A, first, the examiner writes a positioning mark 20 at an arbitrary position on the body surface of the subject 4.
Next, the examiner operates the operation panel 6 so that the position of the laser beam emitted from the first projector 2 and the position of the alignment mark 20 match each other, and the projecting section of the first projector 2 is operated. To move. If the laser beam and the alignment mark 20 match, the examiner operates a predetermined key on the operation panel 6 to determine the position of the light emitting unit (the coordinate position of the light emitting unit at this time). _{P 0 (X 0, Y 0} , Z 0) to) confirm the transmits the position information to the console 8. At this time, the console 8 stores the coordinate position P ₀ (X ₀ , Y ₀ , Z ₀ ) in the first storage means 9.

Here, since the position of the alignment mark 20 is determined, the examiner once lowers the subject 4 from the imaging table 5 and makes a treatment plan.

When the treatment plan is completed, the subject 4 is mounted again on the fifth radiographing as shown in FIG. Note that the body position of the subject 4 at this time is the body position of the subject 4 when X-ray imaging is performed.

Next, the examiner sets the height or Y coordinate of the imaging stage 5 by operating the operation panel 6 to Y _0.

Next, the examiner moves the light projecting section of the first light projector 2 and the imaging table 5 to position the laser beam emitted from the first light projector 2 as shown in FIG. And the mark position 20 for alignment. When this alignment is completed, the examiner operates the operation panel 6 as described above.
By operating a predetermined key of ( ₁ ), the position of the light emitting unit (the coordinate position of the light emitting unit at this time is P ₁ (X ₁ , Y ₁ , Z ₁ ))
Is determined) and the position information is transmitted to the console 8.
At this time, in the console 8, however, in this case, Y ₁
= Y ₀ .

By the operation described above, the operation for correcting the displacement of the subject 4 once lowered from the imaging table 5 is completed. Thereafter, the operation procedure for marking the radiation irradiation position on the subject is the same as the conventional procedure, and a description thereof will be omitted.

Next, FIG. 4 shows a flowchart for explaining the operation of the calculating means.
A procedure for converting the radiation irradiation position calculated based on the subject position at the time of the radiography to the coordinate value of the subject position after the reloading will be described.

The start of this flow is an instruction to start a work of marking a radiation irradiation position performed by the examiner from the operation panel 6 or the console 8. The coordinate position P ₀ (X ₀ , Y ₀ , Z ₀ ) of the alignment mark 20 at the sample position is read (step 401).

Next, the calculating means 12 stores the second storage means 1
Alignment mark 2 from 0 to the subject position after reloading
The coordinate position P ₁ (X ₁ , Y ₁ , Z ₁ ) of 0 is read (step 402).

Next, the calculating means 12 calculates the amount of displacement of the subject 4 after re-mounting from the coordinate position P0 of the positioning mark 20 of the subject position at the time of imaging and the coordinate position P1 after re-mounting. (Step 403). At this time, the calculation of the shift amount is, for example, when the shift amount is ΔP,
Becomes

[0071]

## EQU1 ## ΔP (ΔX, ΔY, ΔZ) = P ₁ −P _{0 where} (ΔX, ΔY, ΔZ) = (X ₁ −X ₀ , Y ₁ −Y ₀ , Z ₁ −
Z ₀ ) Y ₁ = Y ₀ Next, the calculating means 12 reads from the third storage means 11 the coordinate position of the so-called isocenter, which is the center of the radiation treatment planned on the CT image by the examiner (step). 4
04).

Next, the calculating means 12 sets the coordinate position of the isocenter read out in step 404 at step 403.
The displacement amount ΔP calculated in (1) is added, and the coordinate position of the isocenter at the subject position after the remounting is calculated (step 405). At this time, for example, the coordinate position of the isocenter at the time of planning on the CT image is calculated as IC ₀ (Xi
c ₀ , Yic ₀ , Zic ₀ ), and when the coordinate position of the isocenter after the shift amount correction is IC ₁ (Xic ₁ , Yic ₁ , Zic ₁ ), the following equation 2 is obtained.

[0073]

IC ₁ = IC ₀ + ΔP However, even when the coordinate position of the isocenter is a coordinate position using the second projector 3, the corrected coordinate position of the isocenter is calculated by the calculation of the above-described Expression 2. It goes without saying that you can do it.

Next, the calculating means 12 determines whether IC ₁ (Xic ₁ , Y
ic ₁ , Zic ₁ ) is transmitted via the first communication line 7 to the control device (not shown) of the first projector 2 (406), and the control device transmits IC ₁ (Xic ₁ , Yic ₁ , Zic ₁ ). At the coordinate position of
By irradiating the laser light from the light projector 2 of the above, the deviation of the subject 4 can be corrected.

As described above, in the radiation therapy system according to the present embodiment, the coordinate position of the alignment mark 20 written on the body surface of the subject 4 is changed before and after the subject 4 is once lowered from the imaging table 5. Is measured as the coordinate position of the first light projecting means 2, the deviation amount of the coordinate position of the isocenter is corrected by the deviation amount of the subject 4 at the time of remounting, and a radiation irradiation mark ( (Radiotherapy) is performed by aligning the radiation irradiation position of the radiotherapy apparatus with the isocenter mark at the time of radiotherapy.
Even when the subject 4 is lowered from the imaging stand 5, the coordinate position of the isocenter can be accurately indicated without causing any pain to the subject 4.

Further, the displacement of the subject 4 after the reloading is
Alignment mark 2 only by alignment by light emitting device
Since the displacement of the zero position, that is, the displacement of the isocenter mark can be corrected, the time for correcting the displacement of the subject 4 can be reduced. Therefore, since the time required for the radiation treatment plan can be reduced, the time required for the radiation treatment can also be reduced,
The examiner's diagnosis efficiency can be improved.

In the present embodiment, the present invention is applied to an X-ray C
The case where the present invention is applied to a radiation treatment planning apparatus using a T apparatus has been described. However, the radiation treatment planning apparatus to which the present invention can be applied is not limited to an X-ray CT apparatus. It goes without saying that the present invention can be applied to other medical image diagnostic apparatuses such as a resonance imaging apparatus.

Further, the light projecting device is not limited to a light projecting device using a laser device for irradiating a laser beam.
Other light emitting devices using visible light as a light source may be used.

As described above, the invention made by the present inventor is:
Although specifically described based on the embodiments of the present invention, the present invention is not limited to the embodiments of the present invention, and it is needless to say that various modifications can be made without departing from the gist of the present invention. .

[0080]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows.

(1) When the subject is dropped from the radiographing table during the planning of the radiation treatment plan, the deviation between the subject position after reloading and the subject position at the time of imaging can be easily corrected. Can be.

(2) Between the time of measurement of the subject and the time of the mark after the end of the treatment plan, if the subject is once lowered from the imaging table, the position of the subject after reset and the position of the subject at the time of measurement are determined. The time required for positioning can be shortened.

(3) Between the time of measurement of the subject and the time of the mark after the end of the treatment plan, when the subject is once lowered from the imaging table, the position of the subject after resetting and the position of the subject at the time of measurement are determined. Can be reduced.

(4) In the radiotherapy system, the diagnostic efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a radiotherapy system according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a scanner part of the radiation treatment planning apparatus according to the present embodiment.

FIG. 3 is a diagram for explaining a positioning procedure in the radiotherapy planning apparatus of the present embodiment.

FIG. 4 is a flowchart for explaining the operation of the calculation means of the radiation treatment planning apparatus of the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... scanner, 2 ... 1st light projector, 3 ... 2nd light projector, 4 ... subject, 5 ... imaging stand, 6 ... operation panel, 7 ... 1st communication line, 8 ... 1st console, 9 ... first storage means, 10 ... second storage means, 11 ... third storage means, 1
2 ... calculation means, 101 ... treatment gantry, 102 ... irradiation head, 104 ... positioning jig, 105 ... treatment table, 10
6 ... Microtron main body, 107 ... Control device, 108 ...
Second console, 109: second communication line, 110: radiation treatment planning device, 111: radiation treatment device.

Claims (1)

[Claims] 1. After capturing a projection image of a subject set on an imaging table, a tomographic image or a three-dimensional image is formed from the projection image, and the subject is irradiated based on the tomographic image or the three-dimensional image. A radiation treatment planning apparatus for drafting a radiation irradiation plan, and a radiation treatment condition connected to the radiation treatment planning apparatus via a communication line, radiation irradiation conditions obtained through the communication line, and radiation written on the body surface of the subject. A radiation treatment system having a radiation treatment device that performs radiation treatment based on an irradiation position mark, wherein the radiation treatment planning device includes a laser light irradiation unit that irradiates a laser beam to a body surface of a subject; Supporting and moving means for supporting and moving the laser light irradiating means to a predetermined position based on the support; position measuring means for measuring the position of the laser light irradiating means; Displacement of the subject due to movement from the mark position measured by the position measuring means by aligning the laser light of the laser light irradiating means with the aligned alignment mark and the mark position measured after moving the subject And a radiation irradiation position correcting means for correcting the radiation irradiation position determined by the treatment plan.