Avtor/Urednik		Veselko, Matjaž; Trobec, Roman
Naslov		Intraoperative localization of retained metallic fragments in missile wounds
Tip		članek
Vir		J Trauma
Vol. in št.		Letnik 49
Leto izdaje		2000
Obseg		str. 1052-8
Jezik		eng
Abstrakt		Objective: Patients with missile wounds retain fragments of different materials within their bodies. They are usualy of no clinical consequence, but sometimes they can cause complications. Furthermore, the presence of metallic objects is a contraindication for magnetic resonance imaging. Therefore, the fragments should be removed whenever possible. A new metal detector designed for inrtaoperative use and a method that allows exact localization and removal of conductive fragments is presented. Methods: Practical experience shows that the volume of missile fragments varies by a factor of 1,000. Different materials can be detected and located at distances usually not greater than 50 mm. An addaptive electronic amplifier was used in this instruments to lacte missile fragments of different sizes and magnetic properties at different distances. Environmental disturbances such as electrical wires and external magnetic fileds, and the limited dynamics of human perception, were compensated for by the spatial selectivity and adaptive sensitivity of the instrument. The source of the alternating magnetic field was placed in a hand-held probe connected to the instrument, with which small changes in the magnetic field were detected and exploited for the location of metallic fragments. Results: The boundaries of detectability and localizability by the device have been determined for different missile fragments to demonstrate the diagnostic feasibility and limitations of the method. Conclusion: The successful use of the method, in cases where other imaging procedures are either not available or ineffective, is demonstrated by two cases of patients with gunshot wounds.
Deskriptorji		WOUNDS, GUNSHOT METALS INTRAOPERATIVE PERIOD ELECTROMAGNETIC FIELDS AMPLIFIERS