Catheter tip tracking for interventional procedures monitored by magnetic resonance imaging
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United States of America Patent
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Jun 22, 2010
Grant Date -
Feb 22, 2007
app pub date -
Sep 1, 2004
filing date -
Sep 9, 2003
priority date (Note) -
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Abstract
A tracking device (20, 20') for tracking a tip (14) of an interventional instrument such as a catheter (10) during an interventional procedure performed on an associated subject (12) and monitored by magnetic resonance imaging includes a resonant circuit (22) disposed at the tip (14) of the catheter (10). The resonant circuit (22) includes a coil (32, 32') having a coil inductance and a light-sensitive metal-insulator-semiconductor capacitor (30) optically coupled with an optical fiber (36) and having a selected capacitance determined by an intensity of light delivered by the optical fiber (36). A selected resonance frequency of the resonant circuit (22) is determined by the coil inductance and the selected capacitance. The resonance frequency is adjusted by modulating the intensity of light delivered to the light-sensitive metal-insulator-semiconductor capacitor (30).
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