Patent ID: 8260398
Filing Date: 2012-09-04
Classification: A61B,G01B,G01D

Abstract:
1. A position detection system comprising: a first marker placed in a first device insertable into a body lumen, configured to produce a first alternating magnetic field having a first position-calculating frequency by means of an external power supply; a second marker placed in a second device insertable into a body lumen, the second device being different from the first device, the second marker including a magnetic induction coil having a resonance frequency equal to the first position-calculating frequency; a magnetic-field detection section disposed outside a working region of the second marker and configured to detect a magnetic field at the first position-calculating frequency; an extracting section that extracts, from the magnetic field detected by the magnetic-field detection section, a first detection-magnetic-field component having the first position-calculating frequency and having a phase equal to a phase of the first alternating magnetic field; and a position/orientation analyzing section that calculates at least one of a position and an orientation of the first marker based on the intensity of the first detection-magnetic-field component extracted by the extracting section, wherein the extracting section further extracts, from the magnetic field detected by the magnetic-field detection section, a second detection-magnetic-field component having the first position-calculating frequency and having a phase shifted by π/2 with respect to the phase of the first alternating magnetic field, and the position/orientation analyzing section calculates at least one of a position and an orientation of the second marker based on the intensity of the second detection-magnetic-field component.