Prediction Model of Target Movement in Soft Tissue Under Needle Puncture

In the process of needle puncture, there is a problem of puncture deviation caused by target movement in soft tissue. To solve this problem, a target motion prediction model in soft tissue is proposed based on the finite element method of continuum mechanics, a target motion prediction model in soft tissue is proposed. Build the needle puncture experimental platform, collect the ultrasonic image inside the needle puncture soft tissue, after morphological processing, extract the target centroid coordinates at different times, iteratively solve the elastic coefficient of the model, and establish the target motion prediction model. The evaluation experiment shows that the absolute error of the model is controlled within 0.7mm when predicting the target motion in the horizontal X-axis direction. When predicting the target motion. in the vertical Y-axis direction, the absolute error is controlled within 0.06 mm. Compared with the mass spring model, the prediction accuracy is improved, and the prediction curve basically reflects the target motion law, which shows that the model based on the finite element method of continuum mechanics is feasible in predicting the target motion.