Splines of magnetic field values are used by a processor to determine location parameters in a remote location determination system. The location determination system is used on a laser catheter that is operable to perform myocardial revascularization. An automatic calibration technique compensates for...http://www.google.com.au/patents/US6427079?utm_source=gb-gplus-sharePatent US6427079 - Position and orientation measuring with magnetic fields
