Method and system for ablation path planning assisted by ultrasound field of view simulation in arbitrary slices of CT

Abstract

A method and system for planning an ablation path assisted by ultrasound field of view simulation in any slice of CT. The method includes: (1) obtaining CT images, reconstructing bone, body surface, liver, tumor, and blood vessel data; (2) selecting the ultrasound probe position parallel to the right hypocostal space, Generate a CT section through the center of the tumor to ensure that the section does not intersect with the ribs; (3) Cut and transform the CT section to simulate the actual abdominal ultrasound field of view; (4) Generate a needle path within the ultrasound field of view, which needs to meet Constraints not intersecting with blood vessels; (5) Generate a simulated thermal field; judge the relationship between the thermal field and the tumor space coverage, if not completely covered, obtain a parallel section of the plane along the long axis of the coronal tumor, and perform step (3) , until the thermal field completely covers the tumor.

Description

Technical field [0001] The invention relates to the technical field of medical image processing, in particular to a CT arbitrary section ultrasonic visual field simulation assisted ablation path planning method and a CT arbitrary section ultrasonic visual field simulation assisted ablation path planning system. technical background [0002] Ultrasound-guided microwave and radiofrequency ablation therapy is a new local treatment method for liver cancer compared with surgery. This technique is guided by ultrasound, converts electromagnetic waves into heat energy through microwave or radiofrequency needle, and transfers the energy to the tumor area to achieve complete coagulation necrosis of the tumor. It has been recommended by NCCN, BCLC and other international guidelines as the first-line treatment for small liver cancer. However, ultrasound-guided ablation of liver cancer is a comprehensive process involving a variety of knowledge and technical links. Although this technology is...

AI Technical Summary

Problems solved by technology

However, the preoperative planning based on CT images often deviates greatly from the intraoperative puncture path guided by ultrasound, which has become one of the challenges of precise ablation.

[0004] Three-dimensional space display is the advantage of three-dimensional space needle insertion planning, but it also has great limitations. Specifically, there is a large difference between the CT observation field of view and the intraoperative real-time ultrasound field of view, resulting in path planning only based on CT images and actual ultrasound guidance. The maneuverability of lower needle insertion does not match, which eventually leads to a disconnect between surgical planning and actual execution

At present, multimodal image fusion intraoperative navigation technology based on magnetic positioning technology can realize CT and ultrasound image fusion, but it needs to be combined with magnetic positioning device, and the intraoperative needle insertion process still needs to rely on preoperative needle insertion path planning

In addition, the simulated ultrasound method can establish a three-dimensional volume ultrasound based on the real ultrasound acquisition of the region of interest, and display the tomographic image according to the virtual probe position, but the volume ultrasound acquisition process is complicated and difficult to obtain, resulting in poor practicability

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