Patent ID: 11950854
Assignee: GEORGIA TECH RESEARCH CORPORATION
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 21:
22. A marker device for active magnetic resonance imaging (MRI) device location visualization, the marker device comprising:
a system comprising:
a non-conductive optical fiber with a distal end, a proximal end, and an acousto-optical sensor region disposed in proximity to the distal end and comprising a first fiber Bragg grating (FBG); and
an electro-mechanical conversion assembly comprising:
a first antenna configured to receive radio-frequency (RF) electromagnetic energy and produce a corresponding electrical signal; and
a first piezoelectric transducer in mechanical communication with the first FBG, and in electrical communication with the first antenna;
wherein the first piezoelectric transducer is configured to modulate elastic properties of the acousto-optical sensor region with acoustic waves generated responsive to the electrical signal received from the first antenna:

wherein characteristics of the modulated elastic properties of the optical fiber are detectable at the proximal end of the optical fiber; and
wherein at least the optical fiber and the electro-mechanical conversion assembly are configured to reduce MRI RF-induced heating of the system; and

a resonator in communication with the optical fiber and configured to enhance a modulation amplitude of the acousto-optical sensor region;
wherein the resonator comprises a radial mode resonator in communication with the acousto-optical sensor region of the optical fiber; and
wherein at least a thickness dimension of the radial mode resonator is configured to produce one or more resonance frequencies corresponding with one or more Larmor frequencies.