Method and device for detecting rotating part of radiation therapy equipment

Abstract

The invention discloses a method for detecting a rotating part of radiation therapy equipment. The detection method comprises the following steps of 1, fixing a laser sensor at a rotating axis of a rotatable part of the radiation therapy equipment, and respectively arranging three laser positioning lamps on two sides and the top of the laser sensor; 2, calculating intersection coordinates of cross curves of the laser positioning lamps by a computer according to laser signals received by the laser sensor; 3, rotating the rotatable part according to a preset angle; 4, repeating steps 2 and 3 twice at least, and calculating coordinates of a circle center and a radius according to the obtained at least three groups of intersection coordinates through a least square circle fitting equation; 5, detecting whether a difference value between an included angle between radii and a preset angle and difference values between the coordinates of the circle center and horizontal coordinates of the rotating axis are within a standard error range. The method has the beneficial effects that the method completely replaces a manual visual inspection method, the detection is faster, and detection results are more accurate.

Description

technical field [0001] The invention relates to the technical field of medical equipment measurement, in particular to a detection method and device for a rotating part of radiotherapy equipment. Background technique [0002] With the development of science and technology and modern industry, in the field of tumor radiotherapy, medical linear accelerators, analog positioning machines and other medical equipment rotating machinery are developing in the direction of large-scale, high-speed and automation, and the radiation energy of radiotherapy on the human body is getting higher and higher. , which puts forward higher requirements for the state monitoring and fault diagnosis of rotating machinery, and a slight accidental radiation leakage, deflection and tumor position deviation will cause high-energy radiation to irradiate normal tissues or organs of the human body and cause fatal to patients. Impact. [0003] As an important state characteristic parameter of rotating mach...

AI Technical Summary

Problems solved by technology

The isocenter accuracy of the linear accelerator in radiotherapy equipment is a key factor in the quality of modern radiation oncology treatment. Its accurate measurement and adjustment are the primary factors for quality assurance and quality control of a radiotherapy unit. If this problem is not solved, Modern precision radiation therapy methods such as conformal radiation therapy and intensity-modulated radiation therapy cannot be realized

The change of the isocenter accuracy of the linear accelerator will directly affect the positioning of the target area and endangered organs in the patient's radiotherapy plan. Although the machine has passed the acceptance test and met the clinical requirements during installation, in daily use, the equipment is aging due to sports wear and environment. Factors, fault maintenance and other reasons, the mechanical precision becomes poor, resulting in a certain error

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

If there is no reliable guarantee for the accuracy of the isocenter, blindly using conformal radiotherapy and intensity-modulated radiotherapy will definitely lead to radiotherapy failure

[0004] Due to the above reasons, the quality inspection and control of the rotating part of the radiotherapy equipment needs to be carried out frequently during use. However, at present, radiotherapy physicists still need to use squares, levels, coordinate paper, etc. when testing the mechanical and geometric accuracy of the rotating part of radiotherapy equipment. The original auxiliary tools are used to observe and visually check whether the accuracy of the equipment is up to standard through manual calculation and empirical judgment. This is far from meeting the requirements for radiotherapy technology that requires 0.1mm-level accuracy.

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