2 results about "Stereotactic radiotherapy" patented technology

This application provides a method for measuring and analyzing the accuracy of a stereotactic radiotherapy system. The method involves sequentially performing geometric transformations on film images to calibrate the S-L and S-A directions, adaptively correcting positioning errors, purifying the target region through multi-dimensional interference removal, and denoising using normalization and adaptive weighted median filtering. Then, improved fuzzy C-means clustering with fused dual images is used to segment and output label images. Gray-level classification is used to extract the radiation field and tungsten sphere contours. After morphological optimization, the centroid position deviation is calculated. The system accuracy analysis is then completed by combining the S-L and S-A dual film deviations. This application solves the problems of inaccurate contour recognition and large centroid calculation errors in traditional detection methods, significantly improving the accuracy, stability, and robustness of the detection. The steps are clear, the parameters are quantified, and the method is repeatable, providing efficient and accurate technical support for AQA detection in radiotherapy systems.

This invention discloses a control system for a two-stage collimator switching device, relating to the field of medical radiotherapy technology. The invention includes a host computer, a collimator controller, a pneumatic actuator, a quick-change device, a collimator placement platform, a power unit, a detection unit, and a safety interlock. The collimator controller is the core control node, capable of interfaceing with the host computer's radiotherapy plan and driving the pneumatic actuator to power the quick-change device, completing fully automatic online switching between multi-circular collimators and multi-leaf collimators. The detection unit achieves micron-level positioning verification, and the safety interlock provides hardware-level fault protection. It can simultaneously cover stereotactic radiotherapy for small lesions and conformal radiotherapy for large lesions, significantly improving the automation level, treatment accuracy, and clinical safety of radiotherapy, ensuring the safety of radiotherapy equipment use, and possessing strong industrial application value.