Abstract:

BACKGROUND: In the three-dimensional (3D) endocardial mapping system with electric filed positioning principle, the respiration and heartbeat movements influence the positioning signals of mapping catheter in the chest, which greatly affect the positioning accuracy. 
OBJECTIVE: To find a simulation analysis and signal processing method of artificially adding and detecting the respiration and heartbeat interference terms.
METHODS: First, the positioning signals’ mathematical model was proposed according to the mapping principle to determine the signal conditioning, detection and extraction methods. Then, the signal processing was simulated and calculated by Matlab to check if the mathematical model was right. Finally, to meet the requirements of high-speed and real-time during the operation, we designed the corresponding hardware circuit to theoreti-cal model, and used Multisim (circuit design software) to simulate the hardware circuit to check the feasibility of implementing the proposed method in the actual work.
RESULTS AND CONCLUSION: It showed that either numerical simulation or circuit simulation could emulate catheter positioning signals with respiration and heartbeat interference, the theoretical analysis method and actual circuit system could extract the respira-tion and heartbeat interference terms successfully.