Patent ID: 7398117
Filing Date: 2008-07-08
Classification: A61B

Abstract:
1. A system comprising: a device that is adapted to be swallowed and passed though a subject to collect information on the subject, and includes a magnetic filed generator generating a magnetic field of a predetermined intensity; and a position transducer that include: a magnetic field extractor for coordinate-transforming the noise magnetic field components on the basis of a relationship between the predetermined coordinate system and a current coordinate system expended by selected ones of the magnetic detectors, and for extracting a magnetic field at each magnetic detector which magnetic field is caused by the magnetic field generator by removing a coordinate-transformed noise magnetic field component associated with detected magnetic fields detected by the selected magnetic detectors from the detected magnetic field detected by the magnetic detector; and a position processor for calculating a position of the device in the subject based on intensities of extracted magnetic fields extracted by the magnetic field extractor, wherein the system utilizes collected information obtained from the device by associating the collected information with the calculated position of the device.