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　　Light field detection boardIt is an important tool for quality control of radiotherapy equipment. Its working principle is based on sensitive response to radiation and optical imaging technology.
 

　　When rays (such as X-rays, electron beams, etc.) generated by radiotherapy equipment are irradiated onto the detection plate, specific materials in the detection plate will interact with the rays. For different types of rays, the mechanisms of action are slightly different. Taking X-rays as an example, the fluorescent material in the detection plate will be excited and release visible light after being irradiated by X-rays. The intensity of these visible lights is proportional to the radiation dose of X-rays, that is, the greater the radiation dose, the stronger the visible light produced. These visible light signals can be captured and converted into electrical signals or digital image signals through photodetectors or optical imaging systems installed around the detection plate.
 

　　In the case of electron beam irradiation, the ionization chamber or semiconductor sensor in the detection plate material will respond to the ionization effect of the electron beam. When the electron beam passes through the detection plate, it will ionize the material in the detection plate and generate ion pairs. The number of these ion pairs is related to the dose and energy of the electron beam. By measuring the current or charge generated by the ion pairs, the dose distribution information of the electron beam can be obtained indirectly.
 

　　By processing and analyzing the signals acquired by the detection board, key parameters such as field shape, dose distribution, and light field consistency of the radiotherapy equipment can be obtained. For example, the detection board is placed under the treatment head of the radiotherapy equipment, simulating the patient's position to receive radiation, and then using the supporting software system to analyze the collected data, which can visually display the edge clarity of the radiation field, dose uniformity, and whether there are problems such as abnormal motion of the multi-leaf grating blades.
 

　　Light field detection boardPrecautions for use:
 

　　1. Calibration: Calibrate regularly to ensure the accuracy of the tool.
 

　　2. Safety: Pay attention to radiation safety during operation and avoid direct exposure to X-rays.
 

　　3. Professional training: Before use, you should carefully read the relevant operating manual and safety guide and receive professional training.
 

　　4. Quality control: It cannot be used to issue measurement-level test reports without metrological testing and obtaining a certificate of conformity. It is only used for quality control.
 

　　Please note that specific measurement steps and usage precautions may vary with different devices and software. In actual use, the operation instructions and operating procedures of the equipment should be strictly followed.