Zeroing calibration resetting and blade dead-lock solving method for electric multiblade optical grating

Abstract

The invention is applied to solve the deadlock fault of vanes and the zeroing position limit problems in intensity-modulated radiotherapy, while the prior art can only retune the vanes from the deadlock state and perform zeroing by dismantling. The invention realizes zeroing and position limit by adopting opposite type photoelectric detection; and adopts multistage switch to return the vanes from the deadlock state. The invention can return a system to the normal operation state under software control. In the opposite type photoelectric detection, a narrow far infrared ray beam is arranged at each end of a multi-vane grate. An infrared ray receiving terminal sets the tail end of each vane, which is positioned at the edge of the infrared ray, to be a zero point to limit the vane position, and codes the zero position of each vane corresponding to the encoder code of a motor at the same time. The multistage switch is realized through controlling a micro-motor with an encoder by an electric control element, and a system control unit detects the occurrence of deadlock according to the vane position information which is returned from the motor encoder. If the deadlock occurs, the system control unit sends a control signal to a motor driving unit to increase control voltage stage by stage, so as to gradually increase the driving force of a driving chip, and further allow the vanes to return from the deadlock state.

Description

Technical field [0001] The invention belongs to the field of radiotherapy of medical equipment, and provides a method for zero-setting and resetting of electric multi-leaf grating blades used for intensity-modulated radiotherapy and deadlock during movement thereof. Background technique [0002] Radiation therapy is a method that uses ionizing radiation to treat tumors. With the development of radiation therapy technology, intensity-modulated radiation therapy (IMRT) is more and more widely used in clinical treatment because it can increase the therapeutic gain ratio of radiotherapy. The improvement of the therapeutic gain ratio can maximize the radiation dose to the lesion (in the target area), kill tumor cells, and make the surrounding normal tissues and organs less or avoid unnecessary irradiation, effectively improve the local control rate of tumors, reduce the complications of normal tissues, and improve the patient's post-treatment Therefore, the intensity-modulated r...

AI Technical Summary

Problems solved by technology

[0005] DMLC will play a key role in the development of DMLC-based 4D IMRT and other intensity-modulated radiotherapy techniques implemented through DMLC, but the existing DMLC still has many imperfections. In practical applications, it may be due to insufficient positioning accuracy However, it affects the conformity of electric DMLC, and the treatment cannot achieve the optimal effect.

However, if a deadlock occurs during the movement of the relative blades, manual processing such as dismantling and restoration is required, which is very inconvenient to use.

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