Forward scanning optical probes and associated devices, systems, and methods
View Patent ↗Devices, systems, and methods that utilize a technique of changing a position of the set of optical fibers of the fiber bundle in cooperation with the scanning of the imaging light across a proximal surface of the fiber bundle to improve the resolution of the scanned image. In particular, a bundle actuator can be provided to change a position of the set of optical fibers of the fiber bundle in cooperation with a scanning of the imaging light across the proximal surface of the fiber bundle to cover the areas of the gaps between the optical fibers and to increase a resolution of the scanned image.
1. An optical imaging apparatus, comprising:
a fiber bundle, comprising a set of optical fibers configured to guide an imaging light;
a scanning unit, configured to scan the imaging light over a proximal surface of the fiber bundle using a scanning pattern;
a beam forming unit, configured to receive the imaging light from the fiber bundle and to redirect the imaging light to a target region based on the scanning pattern; and
a bundle actuator, configured to adjust a position of the set of optical fibers of the fiber bundle from a first position to at least one additional position different from the first position in cooperation with the scanning unit scanning the imaging light over the proximal surface of the fiber bundle to cause the redirected imaging light to cover areas associated with spacings between adjacent optical fibers of the fiber bundle when the fiber bundle is in the first position.
2. The optical imaging apparatus of claim 1 , the scanning unit comprising at least one of:
a rotatable mirror, a galvanometer, a resonant scanner, a polygon scanner, a MEMS scanner, and a movable stage.
3. The optical imaging apparatus of claim 1 , wherein:
the scanning unit comprises a movable stage; and
the movable stage of the scanning unit and the proximal surface of the fiber bundle are coupled to move together.
4. The optical imaging apparatus of claim 1 , the bundle actuator comprising:
an actuator controller, coupled to the scanning unit and configured to control the bundle actuator to adjust the position of the set of optical fibers in relation to a scanning operation of the scanning unit.
5. The optical imaging apparatus of claim 1 , wherein:
the bundle actuator is configured to adjust a configuration of a distal portion of the set of optical fibers of the fiber bundle; and
the distal portion of the set of optical fibers is disposed in a cannula of an imaging probe.
6. The optical imaging apparatus of claim 1 , wherein:
the bundle actuator is configured to adjust a position of the set of optical fibers of the fiber bundle so that a distance between a center of a fiber in the first position and the center of the fiber in the second position is less than a distance between centers of adjacent optical fibers of the fiber bundle.
7. The optical imaging apparatus of claim 1 , wherein:
the bundle actuator is configured to rotate a distal portion of the set of optical fibers of the fiber bundle.
8. The optical imaging apparatus of claim 1 , wherein:
the bundle actuator is configured to twist a distal portion of the set of optical fibers of the fiber bundle.
9. The optical imaging apparatus of claim 1 , wherein:
the bundle actuator is configured to laterally translate a distal portion of the set of optical fibers of the fiber bundle.
10. The optical imaging apparatus of claim 1 , wherein;
the bundle actuator is configured to longitudinally translate at least one of a distal portion of the set of optical fibers of the fiber bundle and the beam forming unit.
11. The optical imaging apparatus of claim 10 , wherein:
the bundle actuator is part of a manual- or auto-focus sub-system, configured to longitudinally adjust at least one of the distal portion of the set of optical fibers of the fiber bundle and a position of the beam forming unit, to adjust a focal distance of the beam forming unit according to a working distance between an imaging target region and the beam forming unit in order to improve an imaging characteristics.
12. The optical imaging apparatus of claim 1 , comprising:
an imaging probe, comprising
a handle, configured to house the scanning unit, and
a cannula, coupled to the handle and configured to house at least a portion of the fiber bundle.
13. The optical imaging apparatus of claim 12 , wherein:
at least one of the handle and the imaging probe is disposable.
14. The optical imaging apparatus of claim 1 , comprising:
an imaging probe, configured to house at least a portion of the fiber bundle; and
an optical coherence tomography (OCT) engine, configured
to house the scanning unit, and
to generate an OCT image from a returned scanned imaging light returned from an imaging target region.
15. The optical imaging apparatus of claim 14 , wherein:
the OCT engine is positioned in a console.
16. The optical imaging apparatus of claim 1 , the scanning unit comprising:
multiple stages and actuators.
17. The optical imaging apparatus of claim 1 , the set of optical fibers of the fiber bundle comprising at least one of:
a single mode fiber, a multi-mode fiber, a single-mode waveguide, a multi-mode waveguide, and a hollow tube.
18. The optical imaging apparatus of claim 1 , the beam forming unit comprising at least one of:
a lens, a GRIN lens, a ball lens, a diffractive element, an aspherical lens, and an objective lens.
19. The optical imaging apparatus of claim 1 , comprising:
a movable beam steering unit positioned distal to the distal end of the fiber bundle and configured to increase a density of scanning spots in an imaging target region.
20. The optical imaging apparatus of claim 19 , wherein:
the movable beam steering unit is part of a manual- or auto-focus sub-system, configured to longitudinally adjust a position of an optical element of the beam forming unit according to a working distance between an imaging target region and the beam forming unit in order to improve an imaging characteristics.
21. A method of ophthalmic imaging, comprising:
scanning an imaging beam across a proximal end of a fiber bundle with a scanning unit;
directing the imaging beam by a beam forming unit to a target region of an eye; and
adjusting a configuration of a distal portion of the fiber bundle with a bundle actuator, wherein adjusting the configuration of the distal portion of the fiber bundle includes moving at least the distal portion of the fiber bundle from a first position to at least one additional position different from the first position in cooperation with the scanning of the imaging beam over the proximal end of the fiber bundle to cause the imaging beam to cover areas associated with spacings between adjacent optical fibers of the fiber bundle when the fiber bundle is in the first position.
22. The method of claim 21 , wherein adjusting a configuration comprises:
adjusting the configuration of the distal portion of the fiber bundle with a bundle actuator so that a distance of a center of a fiber before and after the adjustment is less than a distance between centers of adjacent optical fibers of the fiber bundle.