FERROMAGNETIC FOREIGN BODY DETECTION UTILIZING EYE MOVEMENT

摘要

Method and apparatus for using magnetic susceptibility measurements to dete ct ferromagnetic foreign bodies (FFBs) in the eye. The method involves having t he patient rotate his or her eyes, modulating the orientation and/or location of the FF B in relation to the sensing apparatus. This changing orientation or position will modulate t he magnetic susceptibility signal from the FFB, without substantially changing the magnetic susceptibility response of the patient's body tissues. Consequently, modulation of the magnetic signal due to the motion of the eye will indicate the presence of a n FFB in the eye. Eye movement may also be used in conjunction with the detection of ferromagnetic foreign bodies by means other than magnetic susceptibility measurements, suc h as x-rays and ultrasound.