Patent ID: 7742799
Filing Date: 2010-06-22
Classification: A61B,G01R

Abstract:
1. An interventional instrument for use in an interventional procedure performed on an associated subject and monitored by magnetic resonance imaging, the interventional instrument including: an element adapted for insertion into the associated subject for performing the interventional procedure; an optical fiber arranged to deliver light to a selected location on the element; and a resonant circuit disposed at the selected position on the element, the resonant circuit including a coil having a coil inductance and a light-sensitive metal-insulator-semiconductor capacitor optically coupled with the optical fiber and having a selectable capacitance determined by an intensity of light delivered thereto by the optical fiber, a selected resonance frequency of the resonant circuit being determined by the coil inductance and the selected capacitance, the selected resonance frequency being selectable by adjusting the light intensity to correspond to a tuned resonance frequency detected by the magnetic resonance imaging.