A pulse oximetry sensor adapted to emit light from an emitter proximate to a patient's tissue and detect a portion of the emitted light on a detector proximate to the tissue. The pulse oximetry system is adapted to acquire position data for the emitter and for the detector with one or more position indicators....http://www.google.de/patents/US7890153?utm_source=gb-gplus-sharePatent US7890153 - System and method for mitigating interference in pulse oximetry
