A Real-Time Fusion Method of Ultrasound and CT

Abstract

Nowadays, thanks to the inadequacy of single ultrasound (US) image in ultrasound-guided percutaneous interventional therapy, a real-time fusion method of US image and CT image based on NDI Aurora electromagnetic positioning is proposed in the paper. This method uses the independently developed marker to obtain the coordinate values of 8 lead ball centers in the magnetic field coordinate system and the CT image coordinate system, and then performs automatic spatial registration. The calibration matrix of ultrasonic probe is obtained by the method of ultrasonic probe calibration based on the "N" shape wire-frame. Real-time ultrasound images are unified into CT images through mutual transformation of multiple coordinate systems, and the fusion error between real-time ultrasound images and CT images is 0.53 ±0.04 mm, meeting the clinical needs of image-guided interventional therapy.