부산대학교 도서관

Heart surgeries, such as cardiac ablations, require an extremely accurate estimate of the location of the myocardium in millimeters. This paper develops the use of a UWB radar system to track the position of the myocardium in real time. We construct a phantom to simulate the dielectric propagation path from the precordium to the myocardium which includes an obstacle to simulate the chest wall and a motion stage to simulate cardiac motion. We use a commercially available radar system operating in the 6–10 GHz frequency range, however, this large bandwidth is still inadequate. Therefore, we utilize the high available sampling rate to interpolate, using the Gaussian transmitted signal, to obtain finer resolution. We test our approach by tracking the phantom position with the motion stage simulating sinusoidal and chirp movements. The results show that the radar system can provide adequate resolution to track a cardiac wall phantom. The next paper will report the experiments on a live cardiac wall with ethics approval.