Method and system for online compensation of tumor motion generated by respiration

Abstract

The present invention proposes a method and system for online compensation of tumor motion generated by respiration. The method includes the following steps: acquiring real-time motion information of the tumor through multiple position sensors, wherein the multiple position sensors are set inside the tumor; The motion information decomposes the real-time motion of the tumor into baseline drift motion and respiratory fluctuation motion; respectively predicts the position of the baseline drift motion and respiratory fluctuation motion after a predetermined time to obtain the baseline prediction data and fluctuation prediction data; and according to the baseline prediction data and The heave prediction data compensates for baseline drift motion and respiratory heave motion separately. The method of the invention can perform real-time on-line compensation for the tumor movement generated by respiration, thereby realizing precise and efficient radiotherapy.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to a method and system for online compensation of tumor motion generated by respiration. Background technique [0002] Radiation therapy is currently one of the main means of treating tumors, and the accuracy of its radiation delivery directly affects the therapeutic effect and the safety of patients. During radiation therapy, due to the breathing of the patient, the tumor (especially the tumor in the chest cavity and abdominal cavity) will have relatively large movements, which greatly reduces the accuracy of radiation therapy. [0003] For example, lung tumors can move up to 14mm, 3mm, and 12mm in the ventral dorsal, lateral, and head-foot directions caused by respiratory movement; the movement range of liver tumors in the three directions can reach 12mm, 9mm, and 26mm. [0004] At present, the main means to deal with tumor movement caused by breathing during radiothera...

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Problems solved by technology

However, this real-time compensation method is only applicable to the mechanical structure of the mechanical arm with the accelerator, and the general radiotherapy equipment cannot be used.

[0009] In addition, due to the limitation of the dynamic performance (velocity and acceleration) of the multi-leaf grating, the multi-leaf grating cannot track the movement of the tumor in real time, so so far there is no method that can use the multi-leaf grating to compensate the tumor motion caused by respiration in real time.

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