Position detection system

摘要

A position detection system for detecting a position of a capsule medical device is provided. The capsule medical device has a coil constituting a part of a resonance circuit to generate an AC magnetic field. The position detection system includes: sensing coils that detect the AC magnetic field and output detection signals; and a calculation unit that calculates the position of the capsule medical device based on the detection signals. The calculation unit: determines a sensing coil having a maximum amplitude of the AC magnetic field as a reference coil among the sensing coils based on amplitude values of the AC magnetic field detected by the sensing coils, the amplitude values being calculated based on the detection signals; and determines a polarity of each sensing coil based on a first detection signal from the reference coil and a second detection signal from each sensing coil other than the reference coil.

主权项

1. A position detection system for detecting a position of a capsule medical device, the capsule medical device having: a coil constituting a part of a resonance circuit to generate an AC magnetic field by flowing of current; a power source for supplying power to the coil; and a capsule casing, the coil and the power source being provided inside the casing, the position detection system comprising:
a plurality of sensing coils configured to detect the AC magnetic field generated by the coil and to output detection signals; and a processor comprising hardware, the processor being configured to:
calculate the position of the capsule medical device based on the plurality of detection signals output from the plurality of sensing coils,determine a first sensing coil having a maximum amplitude value of the AC magnetic field as a reference coil among the plurality of sensing coils based on amplitude values of the AC magnetic field detected by the plurality of sensing coils, the amplitude values being calculated based on the plurality of detection signals; anddetermine a polarity of each of the sensing coils based on a first detection signal output from the reference coil and a second detection signal output from a second sensing coil other than the reference coil among the plurality of sensing coils.