The present invention is a magnetic field detection device that makes use of a frequency characteristic affording circuit in order to selectively detect magnetic signals from a frequency domain accurately at a high level of sensitivity. The reactor output is processed by particle collection devices and heat exchangers to provide particle outputs of different sizes. The illustrated embodiments show different mechanisms by which a probe holder may be movably mounted to the ultrasound system. The user identifies a location within the document and enters remarks associated with that location. The cannula is compatible with endoscopic devices as well as standard housingseal and trocar systems.