Imaging techniques using an imaging guidewire
First Claim
Patent Images
1. A method comprising:
- tuning a pulsed transmit laser to a first wavelength and transmitting first optical signals;
switching, using an optical switch circuit, the first optical signals from the pulsed transmit laser to at least a first one of a plurality of optical fibers toward first blazed Bragg gratings configured to generate acoustic energies for imaging first regions in response to the first optical signals;
sensing acoustic energies from the first regions and providing responsive second optical signals,tuning the pulsed transmit laser to a second wavelength and transmitting third optical signals;
switching, using the optical switch circuit, the third optical signals from the pulsed transmit laser to at least a second one of a plurality of optical fibers toward second blazed Bragg gratings configured to generate acoustic energies for imaging second regions in response to the third optical signals;
sensing acoustic energies from the second regions and providing responsive fourth optical signals;
acquiring information from the responsive second and fourth optical signals;
generating an image of the first and second regions from the information;
tracking, using a laser tracking circuit of receive laser circuitry, a position of a point on a slope of a transmission notch generated within a reflection band by a pair of fiber Bragg gratings, wherein the first and second blazed Bragg gratings are positioned between the pair of fiber Bragg gratings; and
adjusting an operating characteristic of the pulsed transmit laser using a change in the position of the point to compensate for a change in temperature.
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Abstract
Techniques for imaging are disclosed. In one example, the disclosure is directed to a sensor positioned on an elongate optical fiber. The sensor comprises a plurality of blazed Bragg gratings configured to generate acoustic energy for imaging a region in response to a first optical signal, an interferometer configured to sense acoustic energy from the region and to provide a responsive second optical signal, the interferometer including a first fiber Bragg grating (FBG) and a second FBG, wherein the plurality of blazed Bragg gratings are positioned between the first and second FBGs.
249 Citations
9 Claims
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1. A method comprising:
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tuning a pulsed transmit laser to a first wavelength and transmitting first optical signals; switching, using an optical switch circuit, the first optical signals from the pulsed transmit laser to at least a first one of a plurality of optical fibers toward first blazed Bragg gratings configured to generate acoustic energies for imaging first regions in response to the first optical signals; sensing acoustic energies from the first regions and providing responsive second optical signals, tuning the pulsed transmit laser to a second wavelength and transmitting third optical signals; switching, using the optical switch circuit, the third optical signals from the pulsed transmit laser to at least a second one of a plurality of optical fibers toward second blazed Bragg gratings configured to generate acoustic energies for imaging second regions in response to the third optical signals; sensing acoustic energies from the second regions and providing responsive fourth optical signals; acquiring information from the responsive second and fourth optical signals; generating an image of the first and second regions from the information; tracking, using a laser tracking circuit of receive laser circuitry, a position of a point on a slope of a transmission notch generated within a reflection band by a pair of fiber Bragg gratings, wherein the first and second blazed Bragg gratings are positioned between the pair of fiber Bragg gratings; and adjusting an operating characteristic of the pulsed transmit laser using a change in the position of the point to compensate for a change in temperature. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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tuning a pulsed transmit laser to a first wavelength and transmitting a first optical signal; switching, using an optical switch circuit, the first optical signal from the pulsed transmit laser to an optical fiber toward a first blazed Bragg grating configured to generate acoustic energy for imaging a first region in response to the first optical signal; sensing, using an interferometer including a first fiber Bragg grating (FBG) and a second FBG, acoustic energy from the region and providing a responsive second optical signal; tuning the pulsed transmit laser to a second wavelength and transmitting a third optical signal, switching, using the optical switch circuit, the third optical signals from the pulsed transmit laser to the optical fiber toward a second blazed Bragg grating configured to generate acoustic energy for imaging a second region in response to the third optical signal, wherein the first and second blazed Bragg gratings are positioned between the first and second FBGs; sensing, using the interferometer, acoustic energy from the second region and providing a responsive fourth optical signal; acquiring information from the responsive second and fourth optical signals; generating an image of the first and second regions from the information; tracking, using a laser tracking circuit of receive laser circuitry, a position of a point on a slope of a transmission notch generated within a reflection band by a pair of fiber Bragg gratings, wherein the first and second blazed Bragg gratings are positioned between the pair of fiber Bragg gratings; and adjusting an operating characteristic of the pulsed transmit laser using a change in the position of the point to compensate for a change in temperature. - View Dependent Claims (6, 7, 8)
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9. A system for generating images of a body lumen, the system comprising:
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a pulsed transmit laser configured to transmit first optical signals at a first wavelength; an optical switch circuit configured to switch the first optical signals from the pulsed transmit laser to at least a first one of a plurality of optical fibers toward first blazed Bragg gratings configured to generate acoustic energies for imaging a first region of the body lumen in response to the first optical signals; receive laser circuitry including; a receive laser configured to transmit second optical signals at a second wavelength on a second one of the plurality of optical fibers, the second optical signals to be modulated by the acoustic energies; and a laser tracking circuit configured to track a position of a point on a slope of a transmission notch generated within a reflection band by a pair of fiber Bragg gratings, wherein the first and second blazed Bragg gratings are positioned between the pair of fiber Bragg gratings; data acquisition circuitry configured to acquire information from the modulated second optical signals; and a controller configured to; tune the transmit laser to the first wavelength; tune the receive laser to the second wavelength; and an imaging processing system configured to execute instructions that define an imaging algorithm to generate an image of the first region of the body lumen; and adjust an operating characteristic of the pulsed transmit laser using a change in the position of the point to compensate for a change in temperature.
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Specification