| 摘要 |
GB-2314158 A; The tracking system includes a self referencing catheter having an inner core (20) with at least one transducer (23) placed on its head (22). An outer sheath (1) is adapted to movably receive the inner core. The outer sheath includes a number of sensors (12) and a device for fixing the sheath at a set position. The sensors receive signals generated by the transducer, so as to produce measurement signals in accordance with a time of propagation of the signals for determining the position of the head relative to the outer sheath. In another embodiment, a number of transducers can be arranged to be in communication with a human or animal torso for emitting signals into the torso. Video cameras monitor the transducers. An acoustic sensor placed on the tip of the catheter, receives the emitted signals. An absolute position of the tip of the catheter is determined on a basis of the monitored transducers and a time of propagation of the signals to the sensor. <IMAGE> |
