CS237013B1 - Apparatus for stepping control of the irradiator for therapeutic purposes - Google Patents

Abstract

The device is intended for controlling the motion therapy of radiation therapy devices for the treatment of cancer in a stepwise manner. This allows for a minimal configuration where only a position sensor and a dosimeter are connected to the evaluation element, the output then controls the drive of the radiation device and turning the radiation on or off. By selecting a sufficiently fine step of 1° to 5°, therapeutic results similar to precise continuous motion therapy are achieved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an irradiator device for movement therapy in the treatment of cancer.

The irradiation of cancer by means of various irradiators is performed either by static therapy or by movement therapy. In static therapy, the tumor is irradiated from only one Direction and the appropriate field size is selected. When a larger array size is required, the array folding technique is chosen, but it is also static irradiation. In motion therapy, the irradiator performs a circular movement over the patient so that the center of the motion trajectory is placed in the tumor site. This will provide better therapeutic effects. Motion therapy is performed either by swinging or in a single swing that has a better dose distribution and reduces the dynamic load of the mechanisms. However, the control of motion therapy in a single swing is quite complex and exacting, especially if it is an electron accelerator with unstable exposure power.

Motion therapy can be simulated statically in steps where the irradiator does not irradiate on a continuous path, but always moves one step and the partial dose glows. This method is relatively simple, but has so far been used only experimentally in static therapy irradiators.

The above drawbacks are to a large extent eliminated by the apparatus for stepwise control of the irradiator for therapeutic purposes, operating according to the pre-prepared irradiation program according to the invention. It is based on the fact that it consists of an evaluation device, a source of information about the position of the irradiator and a dosimeter, or a source of a fixed time interval for one step. The outputs are connected to the irradiator drive control block and to the irradiator on / off block. With its inputs, the evaluation device is connected to the source of the irradiation position information and to the dosimeter or source of the fixed time interval for the one-step step, in the case of use of the irradiator with Constant Exposure Power. The evaluation device may also be connected to a block for controlling the movement of the table for the patient or the control of the irradiator and the patient table.

The device in this single-needle configuration allows therapy that is sufficient when selected

Claims (2)

SUBJECT A device for stepwise control of a feed for therapeutic purposes, operating according to a pre-prepared irradiation program, characterized in that it comprises an evaluation device (1), a feed position information source (2) and a dosimeter (3) or a fixed time source for a step wherein the evaluation device (1) is coupled to the irradiation drive control block (4J) and further to a fine step block (5) of 1 ° to 5 ° giving therapeutic results as a precise motion therapy in a single swivel, irradiation speed of the irradiator and regulator of exposure power In addition to the movement therapy is achieved more accurate conservation.The basic preservation of continuous distributed doses by folding isodose curves from different directions here exactly corresponds to the conditions of actual irradiation. In the accompanying drawing, one embodiment of the device according to the invention is shown schematically. The stepper feed device consists of an evaluation device 1, which is connected via inputs to a position source 2, a feed device and a dosimeter 3. With its outputs, the evaluator 1 is connected to the feed drive control block 4 and to the feed ON / OFF block 5 . If a constant exposure power irradiator is used, dosimeter 3 can be replaced by a fixed time interval source for one step. The evaluation device 1 may be connected to a block 6 for operating the patient table or operating both the irradiator and the patient table. The source position information source 2 provides the source position information and the dosimeter 3 provides the radiation dose information. Both of these information are processed in the evaluation device 1, which calculates a partial dose for one step according to a preset number of steps. During operation the irradiator monitors its radiation. After evaluating the achieved partial dose setpoint, the block 4 command controls the irradiator drive to move the irradiator to the next step position and, at the beginning and end of the irradiation, the block 5 to turn the radiation on and off. The radiation can also be switched off while moving between steps. If the irradiator with a constant exposure power is operated, then the reading of dosimeter 3 can be replaced by the time value because the dose is given by the product of time and exposure power. The described procedure in the configuration of blocks according to the invention can also be applied when the irradiator is at rest and the patient table is moving, or when both the irradiator and the patient table are moving. I invent the feed on and off and its inputs connected to the source (2) information on the position of the feed and the dosimeter (3) or a fixed time interval for one step. Device according to claim 1, characterized in that the evaluation device (1) is connected to a block (6) for controlling the movement of the patient table or the control of the irradiator and the patient table. 1 sheet of drawings