Puncture path planning method for CT-guided thermal ablation of liver tumors

Abstract

The invention discloses a CT-guided puncture pathway planning method in thermal ablation therapy on liver tumor. The method comprises the following steps: firstly segmenting and extracting critical anatomical structures of skin, liver tumor, liver and abdomen from a CT image of a patient with liver cancer, and carrying out three-dimensional drawing and reconstruction; quantifying a gray-scale mapof the abdominal critical anatomical structure and a liver tumor target, and calculating the angle between an optional puncture pathway and the liver capsule; constructing a gray-scale constraint mapmeeting constraint conditions such as the puncture pathway evading the abdominal critical anatomical structure, depth of the puncture pathway and angle of the puncture pathway on surface of the three-dimensional bounding box of the CT image; screening out a feasible needle-inserting area on the gray-scale constraint map based on the threshold value according to clinical strong constraint conditions; normalizing gray values of the gray-scale constraint map in the feasible needle-inserting area according to clinical weak constraint conditions to obtain weighted results and corresponding space coordinates in the gray-scale constraint map; and combining the weighted results with the space coordinates of the liver tumor target to obtain the puncture pathway. The invention has the characteristics of full automation, low algorithm complexity and high planning precision.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a computer-assisted CT-guided puncture path planning method for thermal ablation of liver tumors. Background technique [0002] Liver cancer is one of the most common malignant tumors in my country, with the fifth highest incidence rate and the third highest mortality rate. Thermal ablation of liver tumors (including radiofrequency ablation and microwave ablation, etc.) has become the third most radical treatment after surgical resection and liver transplantation. Under the guidance of medical images, the ablation needle (radio frequency electrode / microwave antenna) is inserted into the tumor as a heat source, and the tumor tissue is heated to a higher temperature to cause coagulation necrosis of the tumor in situ. The puncture path planning of the ablation needle based on medical images is an opportunity for thermal ablation of liver tumors, which directly determines the success...

AI Technical Summary

Problems solved by technology

At present, clinical puncture path planning still relies on the experience of doctors, especially when the angle between the puncture path and the cross-section of the patient's CT (Computed Tomography, computerized tomography imaging) is large, it is time-consuming and labor-intensive to rely on human-made path planning. And the planning accuracy is difficult to meet the clinical needs

Images