| 摘要 |
In a method for determining the position of a catheter inside the body of a patient from position signals transmitted by the catheter and received by position location means (10), located at a distance from the catheter, or from position signals transmitted by position location means and received by the catheter, position signals are transmitted during a calibration stage from known calibration positions (8) inside the body, or position signals, transmitted by position location means, are received at the said known calibration positions. A correction function is determined from the difference between the calibration positions derived from the received location signals and the known, true calibration positions, whereupon catheter positions, derived from received position signals, are corrected in subsequent measurement stages according to the correction function. A device for determining the position of a catheter inside the body of a patient has a transmitter or receiver (8), arranged on the catheter, means (24,26,28) for moving the catheter to different positions inside the body, position location means (10) located at a distance from the catheter and equipped with receivers for receiving position signals from the catheter transmitters or equipped with transmitters for transmitting position signals for reception by catheter receivers, and an analysis unit (32) for determining the position of the catheter from received position signals. The analysis unit is arranged to determine, in a calibration stage, with calibration transmitters in known calibration positions inside the body to transmit position signals for reception by position location means or calibration receivers in known calibration positions derived from position signals, transmitted by the position location means, a correction function from the difference between calibration positions derived from received position signals and the said known, true calibration positions for calibration transmitters or receivers. The analysis unit (32) is further arranged to use the correction function for correcting, in subsequent measurements, the catheter positions determined from received position signals. <IMAGE> |
