PROBLEM TO BE SOLVED: To provide an object tracing method and a device for which an impedance measurement is utilized.SOLUTION: An impedance calibration method has a step in which at least the first, second and third electrodes (48) are combined to the surface of the body of a subject (26) at each place. The first electric current which flows between the first body surface electrode and the second body surface electrode through the body is measured. At the same time, the second electric current which flows between the first body surface electrode and the third body surface electrode through the body is measured. From the first and second electric currents, a contact modulus indicating an impedance between at least one of the body surface electrodes and the surface of the body is introduced. A method in which the position of a probe is detected, and a tissue contact is detected based on a relationship between electric current phases from the probe to the body surface electrode is provided as well.COPYRIGHT: (C)2007,JPO&INPIT【課題】インピーダンス測定を利用した物体追跡方法および装置を提供する。【解決手段】インピーダンス較正方法が、少なくとも第1、第2および第3の電極(48)をそれぞれの場所で被験者(26)の体の表面に結合するステップを有する。第1の体表面電極と第2の体表面電極との間で体を通って流れる第1の電流を測定すると共に第1の体表面電極と第3の体表面電極との間で体を通って流れる第2の電流を測定する。第1および第2の電流から、体表面電極のうちの少なくとも1つと体の表面との間のインピーダンスを表す接触係数を導き出す。プローブの位置を検出し、プローブから体表面電極までの電流相互間の関係に基づいて組織接触を検出する方法もまた開示される。【選択図】図1
