Real-time detecting method and system for multi-leaf collimator blade position of linear accelerator

Abstract

The invention discloses a real-time detecting method and system for multi-leaf collimator blade position of a linear accelerator. The method comprises the following steps: processing the video collected by two routes of the video collectors, obtaining the actual movement state and position of the multi-leaf collimator; and comparing with the set movement state and position of the multi-leaf collimator, and realizing the position precision detection to the multi-leaf collimator. The method is capable of collecting the movement video of the collimator blade, performing the image processing to the image of the collected video, obtaining the actual displacement of the collimator blade in the image; and comparing with the planed displacement of the collimator blade, obtaining the displacement error, and alarming while the displacement error exceeds the error range. The method has higher precision, and the blade positioning situation can be displayed online in real time during the self-inspection or radiotherapy. The requirement of the hardware is lower, the system cost is low, and the system can be repeatedly used. The system does not need other operates after the success of system installation and debugging, a related person can learn easily, and the using is convenient.

Description

technical field [0001] The invention relates to a method and system for real-time detection of the blade position of a linear accelerator multi-leaf grating. Background technique [0002] With the characteristics of high conformality, simple operation and fast movement, MLE has been widely used in radiation therapy. During radiotherapy, the positioning accuracy of the MLE is of great significance to the accuracy of the irradiation dose in the target area and the protection of normal tissues and organs. Therefore, it is necessary to detect the positioning accuracy of the blades of the multi-leaf collimator. [0003] At present, the detection methods for multi-leaf gratings mainly include dose film method, planar detector array method, and electronic portal imaging system. [0004] The dose film method is to obtain the position information of the grating blades by processing the irradiated film, but the conditions of film processing and the determination of reference points ...

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Problems solved by technology

[0004] The dose film method is to obtain the position information of the grating blades by processing the irradiated film, but the conditions of film processing and the determination of reference points will affect the measurement results, and the process is cumbersome, the workload is heavy, and the film reuse rate is low.

[0005] The planar detector array method uses an ionization matrix to obtain the position of the grating blades, but due to the limitation of the area specification of the selected ionization matrix, it is impossible to detect the position of all the blades at the same time

[0006] The principle of the electronic portal imaging system is similar to that of the film method, but due to the limitation of its measurement area, it needs to be equipped with electric translation equipment, which requires high hardware requirements

The above three methods all calculate the position of the grating blades through the measurement of the radiation field, instead of directly measuring the position of the grating blades, they are all indirect measurements, and cannot realize real-time detection

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