Preoperative dose verification method and device and radiotherapy equipment

Abstract

The invention discloses a preoperative dose verification method and device and radiotherapy equipment. The verification method comprises the steps of S1, carrying out EPID continuous image collection, and extracting an effective image from all images; S2, carrying out image correction on each effective image; S3, enabling each corrected image to be calibrated and corrected, superposing all the images after processing and carrying out weight correction to obtain a corrected fluxgraph; S4, performing Monte Carlo dose calculation through the corrected fluxgraph to obtain reconstructed dose distribution; and S5, comparing the reconstructed dose distribution with TPS calculation, calculating a passing rate according to gamma analysis, and outputting a verification result. According to the method, Monte Carlo dose calculation is adopted as a pixel-to-dose mapping means, and the accuracy is high. And each image is calibrated and corrected frame by frame, so that detail loss caused by acquisition is avoided, dependence on a dose algorithm is reduced, and the reconstruction accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of radiotherapy, and in particular relates to a preoperative dose verification method, device and radiotherapy equipment. Background technique [0002] At present, dose verification is carried out through verification tools such as water tanks, two-dimensional arrays (ion chambers or semiconductor probes) or films. Although the water tank can accurately reflect the distribution of the absolute dose, the steps of setting up the water tank are cumbersome and time-consuming, which is not conducive to the daily QA work. Although the two-dimensional matrix is ​​simple to operate, it is limited by the accuracy and cannot well reflect the rapidly falling dose gradient in the plan. Although the spatial accuracy of film is high, the subsequent processing is more complicated, and the linear response range is narrow, which is not suitable for the verification work of the current treatment. Secondly, the current three...

AI Technical Summary

Problems solved by technology

Although the water tank can accurately reflect the distribution of the absolute dose, the steps of setting up the water tank are cumbersome and time-consuming, which is not conducive to the QA work of the daily plan

Although the two-dimensional matrix is ​​easy to operate, it is limited by the accuracy and cannot well reflect the rapidly falling dose gradient in the plan.

Based on the method of measurement reconstruction, although the response of each probe to the absolute (relative) dose can be calibrated, the instability of the EPID probe itself and the calibration process are complicated and lengthy, and re-calibration (water tank) and re-calibration between different accelerators may be required. Constant calibration and therefore higher cost

Algorithm-based reconstruction puts forward higher requirements on the accuracy of the dose algorithm itself, and the fitting process of various parameters is complex and cumbersome

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