JPH0626605B2 - Radiation irradiation control device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radiation irradiation control device,
In particular, the present invention relates to a radiation irradiation control device capable of arbitrarily adjusting a radiation field (radiation region) of radiation emitted to a patient as needed.

[Prior Art] FIG. 3 is a block diagram showing a conventional device of this type. In FIG. 3, (1a) and (1b) are collimator blocks for adjusting the radiation field (radiation region) of the radiation radiated to the patient, which are arranged so as to face each other across the patient. Has been done. (2a), (2b) are motors for driving the collimator blocks (1a), (1b), respectively, and these motors (2a),
(2b) is driven by a required drive circuit (5). (3a) and (3b) are potentiometers, which are adapted to work with the collimator blocks (1a) and (1b), respectively. Further, (4a) and (4b) are amplifiers, which are provided corresponding to the potentiometers (3a) and (3b), respectively, and are connected to the A / D converter (6). (7)
Is a suitable display, collimator block
It is used to display the current position of (1a) and (1b). The drive circuit (5), the A / D converter (6) and the display (7) are all connected to the sequence circuit (8). The sequence circuit 8 is provided with a drive operation switch (81) for the motors (2a) and (2b), and a collimator block (provided via the A / D converter (6) ( Depending on the current positions of 1a) and (1b), a required motor drive signal is issued. Also,
A patient (10) is laid on the couch (9) and
Radiation is applied to the affected area of (10) from the point side. Although not shown in FIG. 3, two pairs of collimator blocks are provided, and each pair is orthogonal to the patient (10).

FIG. 4 is an exemplary diagram for explaining the operation of the conventional example. In FIG. 4, FIG. 4 (a) is an explanatory diagram when there is no auxiliary block, and FIG. 4 (b) is an explanatory diagram when there is an auxiliary block. Further, in FIG. 4, (1a), (1b) and (1c), (1d) are collimator blocks forming a pair, respectively. Then, (41) is a deterrent part that should not be irradiated with radiation, (42) is an affected part of the patient (10) to be irradiated with radiation, and (43) is an auxiliary for shielding the deterrent part (41). It is a block.

Next, the operation of the above-mentioned conventional example will be described with reference to FIGS. 3 and 4. In this type of apparatus, a shielding collimator block made of a certain predetermined heavy metal is arranged between the radiation source and the irradiation unit. And by changing the position appropriately with a motor,
A necessary irradiation field (irradiation region) is formed, and appropriate radiation treatment for the patient is performed. Now
In order to form a required irradiation field for the affected part (42) of the patient (10), the corresponding motor is driven to set the distance between one pair (1a) and (1b) of the collimator block to L, The other pair
It is assumed that the distance between (1c) and (1d) is W. At this time, the irradiation field for irradiating the patient (10) is L
Although it occupies a rectangular area of xW, it contains not only the affected area (42) to which the radiation should be applied, but also the inhibition section (41) that should not be irradiated. There is. Therefore, the auxiliary block (43) having a required shape is provided in the deterring part (41) so that the deterring part (41) is not irradiated with radiation.
It will be placed so as to cover (41). The auxiliary block (43) is also made of a suitable heavy metal. After performing such a coating process, radiation treatment for the affected area (42) is performed.

By the way, the formation of the affected area as described above, the position, etc. are various, and for this reason, it is necessary to readjust the shape of the auxiliary block to be used and its placement location each time the patient to be treated changes. It is also necessary to record the shape in the patient's chart and to mark the projected images of the collimator block and the auxiliary block on the surface of the patient's body prior to the irradiation treatment.

[Problems to be Solved by the Invention] A conventional radiation irradiation control device is configured and operated as described above, and various shapes are required to form an irregular irradiation field other than a rectangular shape. It is necessary to prepare a large number of auxiliary blocks that it has, and there is a problem that it takes time to select and dispose the irradiation treatment when actually performing irradiation treatment.

The present invention has been made to solve the above problems, and is capable of performing irradiation of an irregular irradiation field without an auxiliary block and arranging a patient for irradiation treatment. Can be done accurately in a short time,
As a result, it is an object of the present invention to obtain a radiation irradiation control device capable of performing safe treatment.

[Means for Solving Problems] A radiation irradiation control device according to the present invention comprises a moving means for moving a treatment table for a patient in a predetermined direction, a detection means for detecting a movement distance of the treatment table, and It comprises a defining means for defining an irradiation field for the affected area of the patient and an adjusting means for adjusting the irradiation field according to the movement of the treatment table.

[Operation] In the present invention, the irradiation field of the radiation to the affected area of the patient changes in response to the movement of the treatment table for the patient.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a block diagram showing a radiation irradiation control apparatus according to an embodiment of the present invention, and those designated by the same reference numerals as those in FIG. 3 are the same or corresponding ones.
In FIG. 1, one pair of collimator blocks
The other pair of collimator blocks is located above (1a) and (1b).
(1c) and (1d) are attached. The motors (2a) and (2b) are connected to the first I / O port (11) via the first drive circuit (5). The treatment table (9) is provided with a treatment table motor (12), which is driven by the second drive circuit (14),
This is for moving the treatment table (9) in the front-back direction, for example. Further, a rotary encoder (13) is attached to the treatment table motor (12), and the forward / backward movement position of the treatment table (9) can be detected by an up / down type counter (15). Is being done. The second drive circuit (14) and the counter (15) are connected to the second I / O port (16). The CPU (17) is for controlling the operation of the entire device and collecting and processing various necessary data, and the memory (18) includes a RAM section and a ROM section. Is used to store various data, and the latter is used to store software required for the CPU (17).
Then, the A / D converter (6), the first and second I / O ports (1
1) and 16) are connected to the CPU (17) and the memory (18) via appropriate bus lines.

FIG. 2 is an exemplary diagram for explaining the operation of the above embodiment. In FIG. 2, FIG. 2 (a) is an exemplification diagram at the time when irradiation is started, and FIGS. 2 (b) and 2 (c) are times when irradiation is being performed. FIG. In FIG. 2, the same reference numerals as those in FIG. 4 denote the same or corresponding parts.

Next, the operation of the above embodiment will be described with reference to FIGS. 1 and 2. Now, when the irradiation starts, one pair of collimator blocks (1a), (1b)
Is W1 and the other pair (1c), (1d) above it is
The interval of is assumed to be set to L0. The other pair (1c), (1d) is stationary, and the distance L
0 is assumed to be fixed. Here, when the irradiation of radiation is started, the patient (10) is lying on the treatment table (9).
When the treatment table motor (12) is driven, the robot starts moving, for example, with the head of the patient (10) at the front. Looking at this in FIG. 2, as indicated by the arrows,
It moves from the bottom to the top in the drawing. As a result, the affected part (42) of the patient (10) also moves in the above direction. And the movement distance is the motor for the treatment table (12)
The output pulse from the rotary encoder (13) connected to can be detected by counting with a counter (15). Then, the result of this detection is taken into the memory (18) via the second I / O port (16). Then, after a lapse of a predetermined time, a change in the position and lateral width of the affected area (42) is detected, and one pair (1a), (1b) of the collimator block is set to W2 accordingly. Furthermore, after a lapse of a predetermined time, the change in the position and width of the affected area (42) is detected again, and the interval is set to W3 accordingly. The detection of such changes in the position and width of the affected area and the required processing corresponding thereto are performed by CP based on appropriate software.
It can be performed by U (17). Thus, while continuing the irradiation treatment, the treatment table (9) is moved in a predetermined direction, and the spacing of one pair (1c), (1d) of the collimator blocks is changed as the position and the width of the affected part (42) change. By changing it, arbitrary irregular irradiation can be performed accurately and safely in a short time.

Although the position of the collimator block is detected by the potentiometer in the above embodiment, the invention is not limited to this, and a rotary encoder can be used here as well. Then, in this case, the A / D converter becomes unnecessary.

In the above embodiment, if the rotary encoder used is an absolute type encoder, its output can be directly connected to the second I / O port. However, when the rotary encoder is of the incremental type, the counter is still required. Note that such a rotary encoder can be replaced with a potentiometer.

Furthermore, although it has been described that the treatment table moves only in one direction (for example, the front-back direction), the present invention is not limited to this.
It is also possible to move in the horizontal direction or the vertical direction.

[Advantages of the Invention] As described above, the radiation irradiation control device according to the present invention includes a moving unit that moves the patient treatment table in a predetermined direction, and a detection unit that detects the movement distance of the treatment table. , A defining means for defining an irradiation field for the affected area of the patient, and an adjusting means for adjusting the irradiation field according to the movement of the bed, without using an auxiliary block,
Since it is possible to form an arbitrarily shaped irregular irradiation field, it is possible to accurately position a patient for irradiation treatment in a short time, and as a result, it is possible to perform safe treatment. It is something that can be played.

[Brief description of drawings]

FIG. 1 is a block diagram showing a radiation irradiation control apparatus according to an embodiment of the present invention, FIG. 2 is an illustrative view for explaining the operation of the above embodiment, and FIG. 3 is a conventional type of this kind. FIG. 4 is a block diagram showing the apparatus of FIG. 4, and FIG. 4 is an exemplary diagram for explaining the operation of the conventional example. (1a), (1b), (1c), (1d) are collimator blocks, (2a), (2
b) motor, (3a), (3b) potentiometer, (4a), (4b)
Is an amplifier, (5) is the first drive circuit, (6) is an A / D converter,
(7) is a display, (8) is a sequence circuit, (9) is a treatment table, (10) is a patient, (11) is the first I / O port, (12) is a treatment table motor, and (13) is a rotary. Encoder, (14) second drive circuit, (15) counter, (16) second I / O port, (1
7) is a CPU, (18) is a memory. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (5)

[Claims] 1. A moving means for moving a treatment table for a patient in a predetermined direction, a detecting means for detecting a moving distance of the treatment table, a defining means for defining an irradiation field for an affected part of the patient, and the bed. A radiation irradiation control device comprising: an adjusting unit that adjusts the irradiation field according to the movement of the irradiation field. 2. The radiation irradiation control device according to claim 1, wherein the moving means is a treatment table motor. 3. The radiation irradiation control device according to claim 1, wherein the detection means is a rotary encoder. 4. The radiation irradiation control apparatus according to claim 1, wherein the defining means is a pair of collimator blocks. 5. The CPU according to claim 1, wherein the adjusting means is a CPU that operates with predetermined software.
The radiation irradiation control device as described in the item.