Title :
Magnetic Marker Localization System Using a Super-Low-Frequency Signal
Author :
Oyama, Daisuke ; Adachi, Y. ; Higuchi, Masanori ; Uehara, Gen
Author_Institution :
Kanazawa Inst. of Technol., Kanazawa, Japan
Abstract :
In this paper, a magnetic marker localization system using a super-low-frequency signal-around 100 Hz-is proposed for a surgical navigation system. This method avoids the effect of eddy currents flowing inside metallic surgical tools. The frequency dependence of the magnetic field distortion and localization error due to eddy currents were simulated to determine the optimum signal frequency. From the results of the simulation, the influence of eddy currents on the magnetic marker localization can be insignificant below 1 kHz. The prototype system used marker signals at 94 and 143 Hz and comprised 16-channel fluxgate magnetometers. Markers were successfully localized and the developed system was operational even though metal tools were present in the observation area.
Keywords :
biomagnetism; biomedical equipment; biomedical materials; eddy currents; fluxgate magnetometers; surgery; 16-channel fluxgate magnetometers; eddy current effects; frequency 94 Hz to 143 Hz; frequency dependence; localization error; magnetic field distortion; magnetic marker localization system; marker signals; metal tools; metallic surgical tools; optimum signal frequency; prototype system; super-low-frequency signal; surgical navigation system; Coils; Magnetic resonance imaging; Magnetic sensors; Magnetometers; Metals; Surgery; Fluxgate magnetometers; localization; surgical navigation;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2331370
