An electromagnetic field quality assurance system that employs an electromagnetic field generator 10 that emits an electromagnetic field 12 and one or more quality assurance electromagnetic sensors 11, 21, 31, 41, 50 that detect the emission of the electromagnetic field 12. The system further employs a quality assurance controller 74 that evaluates the tracking quality of the electromagnetic field 12 obtained from monitoring the sensing position of each quality assurance electromagnetic sensor 11, 21, 31, 41, 50 within the field of view of the electromagnetic field 12. The electromagnetic field generator 10, the ultrasonic probe 20, the ultrasonic stepper 30, and / or the patient table 40 may include quality assurance electromagnetic sensors 11, 21, 31, 41, 50.電磁場１２を放出する電磁場発生器１０と、電磁場１２の放出を検知する１つ以上の品質保証電磁センサ１１，２１，３１，４１，５０とを採用する電磁場品質保証システム。このシステムはさらに、電磁場１２の視野内の各品質保証電磁センサ１１，２１，３１，４１，５０の検知位置の監視から得られる電磁場１２の追跡品質を評価する品質保証コントローラ７４を採用する。電磁場発生器１０、超音波プローブ２０、超音波ステッパ３０、及び／又は患者テーブル４０は品質保証電磁センサ１１，２１，３１，４１，５０を備え得る。
