Ultrasonic 3D Measurement uses the principles of ultrasound imaging and ultrasound positioning to confirm the internal coordinate information of the heart for the detection and positioning of interventional catheters, construct real-time three-dimensional images of the heart cavity, and achieve real-time spatial positioning of interventional catheters and corresponding obtained electrical signal information. Used to assist in the ablation therapy of the catheter inside the heart, in order to achieve precise visualization of cardiac intervention surgery and meet clinical needs.