System for detecting position of capsule endoscope in subject

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 plurality of magnetic detectors, disposed substantially at the vertexes of a hypothetical cube circumscribing a part of the subject, for each detecting a magnetic field caused by the magnetic field generator;
• a storage unit that stores at least an intensity of a noise magnetic field component detected by each of the magnetic detectors with the magnetic detectors so oriented as to enable a parallel displacement thereof onto a predetermined coordinate system;
• 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.