Three-dimensional water tank positioning precision detection method based on refraction compensation of laser tracker

Abstract

The invention discloses a three-dimensional water tank positioning precision detection method based on refraction compensation of a laser tracker. The laser tracker is adopted to measure the displacement of a target ball in a three-dimensional water tank filled with water according to a conventional method; then respectively establishing an ADM refraction compensation model and an IFM refraction compensation model; and solving the position coordinates of the target ball and calculating the positioning precision of the three-dimensional water tank. The method has the beneficial effects that the measurement error caused by the refractive indexes of the glass and the water is compensated by establishing the refraction compensation model, the actual position coordinate of the target ball can be finally obtained, and high-precision non-contact underwater detection on the positioning precision of the three-dimensional water tank is realized; the invention provides an effective method for solving the problems of the metering requirement of the positioning precision of the three-dimensional water tank and the traceability of the quantity value, and is beneficial to reducing the uncertainty in the whole radiotherapy process including simulation positioning, plan design, treatment implementation and the like, thereby improving the accuracy and curative effect of radiotherapy.

Description

technical field [0001] The invention relates to a method for detecting the positioning accuracy of a three-dimensional water tank based on refraction compensation of a laser tracker, and belongs to the technical field of medical equipment detection. This method is also applicable to the measurement occasions of all laser trackers under parallel multi-media. Background technique [0002] In recent years, radiotherapy has become one of the three major means of treating cancer. Medical linear accelerators are the main clinical equipment for precise tumor radiotherapy. The accuracy of the radiotherapy dose is related to the therapeutic effect and life safety of patients. The three-dimensional water tank is an irreplaceable quality control tool in the periodic verification and acceptance of medical linear accelerators and the data collection of the treatment planning system. It is of great significance for the verification of radiotherapy dose, formulation and implementation of ...

AI Technical Summary

Problems solved by technology

During the measurement process, the accuracy of the position of the detector in the water will have a greater impact on the measurement results. How to accurately and non-destructively detect the positioning accuracy of the three-dimensional water tank has become a necessary task. The existing detection methods are mainly by measuring The displacement of the detector motion trajectory extension device is used to detect the positioning accuracy, and this method will generate a large load on the motion guide rail, which not only causes measurement errors, but also easily damages the motion guide rail

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