Method for detecting isocenter of linear accelerator and radius of sphere

Abstract

The invention discloses a method for detecting the isocenter of a linear accelerator and the radius of a sphere. The method includes the steps that a first coordinate point, on a photoelectric sensor array, of a laser positioning lamp arranged on a collimator, a second coordinate point, on the photoelectric sensor array, of a laser positioning lamp arranged on a rack and a third coordinate point, on the photoelectric sensor array, of a laser positioning lamp arranged on a treatment table are respectively acquired by adjusting the rotating angle of the collimator, the rotating angle of the rack and the rotating angle of the treatment table; the first coordinate point of the collimator, the second coordinate point of the rack and the third coordinate point of the treatment table are fitted into a circle through a least square method, and the coordinate of the center of the circle is acquired and correspondingly set as the axis of the collimator or the rack or the treatment table; three-dimensional coordinates O (x0,y0 and z0) of the isocenter of the linear accelerator and the radius R of the sphere are calculated according to the axis of the collimator or the rack or the treatment table. The detection result is accurate, and the detection process is simple and quick and convenient to conduct.

Description

technical field [0001] The invention belongs to the field of medical equipment measurement, in particular to a method for detecting the isocenter and radius of a sphere of a linear accelerator. Background technique [0002] In the field of tumor radiotherapy, with the advancement of radiotherapy technology, the radiation energy of radiotherapy acting on the human body is getting higher and higher, and the requirements for the accuracy of the radiotherapy equipment itself are more stringent. Any deviation in the position will cause high-energy rays to irradiate normal tissues or organs of the human body and have a fatal impact on patients. Therefore, it is necessary for radiotherapy physicists to regularly perform quality inspection and control of radiotherapy equipment. [0003] The isocenter accuracy of medical linear accelerators is a key factor in the treatment quality of modern radiation oncology. Its accurate measurement and adjustment are the primary factors for quali...

AI Technical Summary

Problems solved by technology

Although the machine has passed the acceptance test and met the clinical requirements during installation, in daily use, due to equipment wear and tear, environmental factors, fault maintenance and other reasons, the mechanical precision of the machine has deteriorated, resulting in certain errors

At the same time, due to the different equipment installation methods and installation engineers of different manufacturers, as well as the different frequency of use of the machine, it will also affect the accuracy of the linear accelerator isocenter in a certain procedure.

If the accuracy of the isocenter is not reliably guaranteed, the blind use of conformal radiotherapy and intensity-modulated radiotherapy will definitely lead to the failure of radiotherapy

[0004] However, currently all over the world, physicists still have to use original auxiliary tools such as squares, levels, and coordinate papers to observe and visually inspect the mechanical and geometric accuracy of radiotherapy equipment, and use manual calculations and empirical judgments to check whether the accuracy of the equipment is accurate or not. This is far from meeting the clinical requirements in terms of the one-tenth millimeter accuracy required by current radiotherapy technology; at the same time, it also requires a variety of detection tools in terms of radiation dose output, and the detection operations and calculations are complicated and cumbersome. The backwardness of the above detection technology has seriously hindered the effect of radiotherapy

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