Rapid correction device and method for scanning beam position of pencil beam

Abstract

The invention discloses a pencil beam scanning beam position rapid correction device and method, and the device is characterized in that rapid correction magnets are sequentially installed in front of a scanning magnet SMX; the scanning controller is provided with a beam position prediction module based on a neural network, the beam position prediction module stores trained neural network parameters, and the trained neural network parameters are used for integrating information fed back by all the position feedback structures by the beam position prediction module; the method is characterized by comprising the following steps: judging that a predicted position and a feedback position are both greater than a minimum adjustment value and greater than an error threshold value, if so, controlling to quickly correct magnet current and correct a beam position; and if not, judging that the position error is greater than the error threshold value, and judging that the target dose is reached and the irradiation process is finished. According to the method, the local position error is considered, and the overall position error judged by combining the neural network with multiple parameters is also considered, so that unnecessary adjustment caused by local error fluctuation is avoided.

Description

technical field [0001] The invention belongs to the field of cyclotron proton therapy, and in particular relates to a device and method for quickly correcting the position of a pencil beam scanning beam. Background technique [0002] Proton beam scanning is the final and very important part of proton therapy, the final process of delivering the proton beam directly to human tumor cells. The principle of beam scanning is that the protons are affected by the Lorentz force, that is, the protons are deflected under the action of a magnetic field, so that the position of the pencil beam in the (x, y) plane can be adjusted by the scanning magnet. [0003] At present, the common practice in the existing technology is to quickly cut off the beam current through the real-time scanning controller to stop the irradiation process if the irradiation position deviates and exceeds the error threshold during the pencil beam scanning irradiation process, thereby preventing unnecessary dose i...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems raised by the prior art, the present invention proposes a device and method for quickly correcting the position of the pencil beam scanning beam. The purpose is to solve the problem that the adjustment range of the scanning magnet in the prior art is relatively large, which causes the introduction of closed-loop adjustment to make the original system unstable. , and when the cumulative error or uncertain error is too large, it will cause a large error rate in the irradiation process

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