SYSTÈME ET PROCÉDÉ DE SUIVI DE DISPOSITIF PAR IMAGERIE PAR RÉSONANCE MAGNÉTIQUE À L'AIDE DE MARQUEURS À SUSCEPTIBILITÉ MAGNÉTIQUE À MODULATION DE LUMIÈRE
Described here are systems and methods for using a laser-induced demagnetization of magnetic particles disbursed in a tracking marker to generate variable susceptibility effects that can be imaged with magnetic resonance imaging (“MRI”). As one example, laser power is delivered to nickel particles using fiber optics. This demagnetization effect can be used in rapid tracking of interventional devices by subtracting the two images acquired when the laser is off and on.