Intraoperative dynamic path optimization method and device for tumor thermal ablation

Abstract

According to the intraoperative dynamic path optimization method and device for tumor thermal ablation, unnecessary pain brought by respiratory gating to a patient can be reduced, the complexity of a constructed model is moderate, the situation that a 4D model is too complex and consumes too much time and resources is avoided, and the problems that the constructed respiratory movement model is poor in precision and low in reliability are solved. The problems that a puncture path in an operation cannot be optimized in real time, the operation is completed in combination with liver movement under an overall optimal result, a needle inserting path is quantified, display is visual, and operation is simple and easy to implement are solved. The method comprises the following steps: (1) obtaining a segmentation result from a preoperative CT image; obtaining a liver puncturable area, and constructing a preoperative optimal needle insertion path; constructing a breathing model, matching liver motion with breathing phase, and dispersing a breathing signal into k phase segments; for each phase segment, constructing a Markov decision model on the preoperative CT image; accurately assigning a value to the state transition probability Psa; and obtaining an optimal strategy graph of liver puncture.

Description

technical field [0001] The present invention relates to the technical field of medical image processing, in particular to an intraoperative dynamic path optimization method for tumor thermal ablation and an intraoperative dynamic path optimization device for tumor thermal ablation, which are mainly applicable to dynamic planning of ablation surgery. Background technique [0002] Liver thermal ablation is a routine clinical treatment for liver cancer. Under the guidance of medical images, the ablation needle is percutaneously inserted into the tumor, and the tumor and surrounding tissues are heated at high temperature for a certain period of time to completely coagulate and necrosis the lesion tissue to achieve tumor treatment. . [0003] Puncture surgery mainly relies on the doctor's clinical experience. Under the guidance of medical images such as ultrasound or CT, the spatial relationship between the tumor tissue, surroundings, and blood vessels is judged, and the needle i...

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