JPH04129572A - Radiation therapeutic device - Google Patents

Abstract

PURPOSE:To prevent a collision by judging that either interval between a frame or a radiation head and a therapeutic bed or a treated person on the therapeutic bed approaches the preset distance with the video signal of a TV camera, and stopping the frame or the therapeutic bed. CONSTITUTION:A frame 1, a radiation head 2, a therapeutic bed 3 and a treated person 4 are monitored by a TV camera 7 installed on the wall face 8 faced to the frame 1, its video signal 11 is sent to a safety control device 10 for image processing, and their relative relations are grasped. When at least either interval between the frame 1 or radiation head 2 and the therapeutic bed 3 or treated person 4 approaches the preset distance, a safety control device 10 sends a stop signal 12 to the frame 1 or the therapeutic bed 3 moving in the collision direction or to both to stop them, and it stops the generation of radioactive rays. A collision can be prevented, and safety can be improved.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for applying radiation to a desired part of the subject by relative movement between a pedestal equipped with an irradiation head that irradiates radiation and a treatment table on which the subject is placed. The present invention relates to a radiation therapy apparatus that positions a patient for radiation irradiation, and particularly to a radiation therapy apparatus that prevents collisions between a pedestal or an irradiation head and a treatment table or a subject to be treated on the treatment table.

[Prior Art] In order to accurately irradiate a target area with radiation, a radiotherapy device has a gantry equipped with an irradiation head that irradiates radiation and a treatment table on which a patient is placed, which move relative to each other in a complicated manner. .

Therefore, collisions between the pedestal or the irradiation head and the treatment table or the treated object on the treatment table (collision between the pedestal and the treatment table, collision between the pedestal and the treated object on the treatment table, collision between the irradiation head and the treatment table,
There is also a high risk of collision between the irradiation head and the patient on the treatment table.

In conventional radiation therapy equipment, the above-mentioned collision prevention means is provided in the flange portion of the irradiation head as described in Japanese Patent Application Laid-Open No. 2-88081, or in Japanese Patent Application Laid-Open No. 2-3285.
As stated in Publication No. 9, a collision or approach detection means is provided at the part where the possibility of collision is highest, such as the side of the frame.

[Problems to be Solved by the Invention] The above conventional technology has a problem in that it is not highly safe because there are many parts where the pedestal or irradiation head can collide with the treatment table or the object to be treated on the treatment table. was there.

An object of the present invention is to prevent collisions between the pedestal or the irradiation head and the treatment table or the object to be treated on the treatment table by monitoring more and more areas that can collide with each other, thereby further improving safety. The object of the present invention is to provide a radiotherapy device that provides the following features.

[Means for Solving the Problem] The above object is to irradiate a desired part of the subject with radiation by relative movement between a pedestal equipped with an irradiation head that irradiates radiation and a treatment table on which the subject is placed. In a radiation therapy apparatus for positioning, a TV camera is provided so that the pedestal, the irradiation head, the treatment table, and the subject to be treated on the treatment table are always within the field of view, and a video signal from the TV camera is provided. process, determine whether the pedestal or irradiation head and the treatment table or the subject to be treated on the treatment table have approached within a predetermined distance, and at least stop the movement of the pedestal or treatment table. This is achieved by providing a safety control device that allows

[Function] The frame, the irradiation head, the treatment table, and the subject to be treated on the treatment table are always within the field of view of the TV camera.

Therefore, by feeding the video signal obtained from the TV camera to the safety control device and performing image processing and analysis, the relative positions of the pedestal, irradiation head, treatment table, and the patient on the treatment table can be grasped. Alternatively, it is determined that at least one of the irradiation head and the treatment table or the subject to be treated on the treatment table has approached within a predetermined distance. Furthermore, the safety control device stops at least the movement of the gantry or the treatment table, and also stops the radiation generation itself, if necessary, based on the determination result.

As a result, collisions of more collision-prone parts of the above-mentioned parts are prevented, and safety is further improved.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing an embodiment of the radiation therapy apparatus according to the present invention, and FIG. 2 is a diagram of the configuration shown in FIG. 1 viewed from above. In both of these figures, numeral 1 is a pedestal equipped with an irradiation head 2 that irradiates radiation, and 3 is a treatment table on which a subject 4 to be treated is placed.

By relative movement between the gantry 1 and the treatment table 3, positioning for radiation irradiation to a desired region of the subject 4 placed on the treatment table 3 is performed. Reference numeral 5 indicates the central axis of rotation of the gantry, and reference numeral 6 indicates the central axis of rotation of the treatment table. In addition to rotating around the axis 6, the treatment table 3 can also move up and down, left and right in the figure, and in directions perpendicular to the plane of the figure.

7 is a TV camera installed on the wall 8 of the treatment room. This TV camera 7 includes the pedestal 1, the irradiation head 2, and the treatment table 3.
The treatment table 3 is provided at a position where the subject 4 to be treated on the treatment table 3 is always within its field of view, in this case at a position where its front axis 9 coincides with the rotation center axis 5 of the pedestal.

Reference numeral 10 denotes a safety control device that processes (image processing) the video signal 11 from the TV camera 7 and controls at least one of the gantry 1 or the irradiation head 2 and the treatment table 3 or the treated object 4 on the treatment table 3. This is determined when the object approaches within a predetermined distance. Then, the safety control device 10 stops at least the movement of the gantry 1 or the treatment table 3 based on the above determination.

Note that 13 is an irradiation head rotation center axis, and 14 is an isocenter located at the intersection of the irradiation head rotation center axis 13 and the gantry rotation center axis 5.

Next, the operation will be explained.

The pedestal 1, the irradiation head 2, the treatment table 3, and the subject 4 on the treatment table 3 are placed on a T
It is monitored by a V camera 7.

The video signal 11 of this TV camera 7 is transmitted to the safety control device 1.
0, the image is processed therein, and the relative positions of the gantry 1, the irradiation head 2, the treatment table 3, and the treated object 4 on the treatment table 3 are grasped. As a result, when at least one of the gantry 1 or the irradiation head 2 and the treatment table 3 or the treated object 4 on the treatment table 3 approaches within a predetermined distance, that is, when a collision is about to occur, the safety control device 10 , a stop signal 12 is sent to the gantry 1 and/or the treatment table 3, which are moving in the direction of collision, to stop them. For safety reasons, a stop signal 12 is also sent to the radiation generating device (not shown) to stop the radiation generation.

FIG. 3 is a block diagram showing a specific example of the configuration of the safety control device 10, in which 31 is a video signal processing section, and 32 is a CPU.
, 33 is an I10 port, and 34 is a display section. In FIG. 3, a video signal 11 from the TV left camera is sent to a video signal processing section 31. Video signal processing section 31
Now, the video signal 11 is A/D converted to digital image data. With this digital image data, CPU3
2 performs image processing to grasp the relative positions of the gantry 1, the irradiation head 2, the treatment table 3, and the treated object 4 on the treatment table 3. The CPU 32 includes, for example, the pedestal 1, the irradiation head 2,
Obtain the contours of the treatment table 3 and the treated object 4 on the treatment table 3'', observe the approach of the contours, and when they are within a certain distance, a stop signal is sent from the I10 port 33 as there is a high risk of collision. 12 is output. At the same time, the CPU 32 activates a display unit 34, such as a lamp, a buzzer, or a CRT display, to inform the operator that there is a risk of collision.

In the example shown in Figure 1, whether one TV camera 7 is installed or
Two or more units may be installed.

FIG. 4 is a schematic configuration diagram of the apparatus of the present invention showing an example in which two TV cameras 7 are installed.
In addition to the camera 7 being placed in the position shown in FIG.
It is also installed at the location shown in 1. According to this, pedestal 1
, an irradiation head 2, a treatment table 3, and a treatment subject 4 on the treatment table 3
will be monitored from two directions, further increasing safety.

[Effects of the Invention] According to the present invention, it is possible to prevent collisions between the gantry or the irradiation head and the treatment table or the object to be treated on the treatment table by monitoring more and all of the parts that can collide with each other. This has the effect of further improving safety.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the device of the present invention, and FIG.
The figure is a top view of the configuration shown in Figure 1, Figure 3 is a block diagram showing a specific example of the configuration of the safety control device in Figure 1, and Figure 4 is another embodiment of the device of the present invention. FIG. 1... Frame, 2... Irradiation head, 3... Treatment table,
4... Subject to be treated, 5... Frame rotation center axis, 6...
Treatment table rotation center axis, 7...TV left camera 8...wall surface, 9...optical axis, 10...safety control device, 11...
Video signal, 12...Stop signal, 31...Video signal processing unit, 32...CPU, 33...I10 boat, 34...Display unit, 41...Ceiling surface. Diagram

Claims (1)

[Claims] 1. A radiation therapy apparatus that positions a desired part of the subject for radiation irradiation by relative movement between a pedestal equipped with an irradiation head that irradiates radiation and a treatment table on which the subject is placed, A TV camera is provided so that the pedestal, the irradiation head, the treatment table, and the subject to be treated on the treatment table are always within the field of view, and a video signal from the TV camera is processed to connect the pedestal or the irradiation head. The device is characterized by comprising a safety control device that determines that at least either the treatment table or the subject to be treated on the treatment table has approached within a predetermined distance, and stops at least the movement of the pedestal or the treatment table. Radiation therapy equipment.