Method and system of adjusting a field of view of an interferometric imaging device

• US 8,804,133 B2
• Filed: 06/16/2010
• Issued: 08/12/2014
• Est. Priority Date: 06/16/2009
• Status: Active Grant

• Current Assignee: TECHNION RESEARCH AND DEVELOPMENT FOUNDATION, LTD.
• Original Assignee: TECHNION RESEARCH AND DEVELOPMENT FOUNDATION, LTD.
• Inventors: Yelin, Dvir, Merman, Michal
• Primary Examiner(s): HANSEN, JONATHAN M
• Application Number:
  US12/816,394
• Publication Number:
  US 20100315652A1
• Time in Patent Office: 1,518 Days
• Field of Search: 356/521, 356/456, 356/477, 356/494, 356/499
• US Class Current: 356/521
• CPC Class Codes: G01B 2290/20 Dispersive element for generating dispersion
• CPC Class Codes: G01B 9/0201 using temporal phase variation
• CPC Class Codes: G01B 9/02027 Two or more interferometric channels or interferometers
• CPC Class Codes: G01B 9/02044 Imaging in the frequency domain, e.g. by using a spectrometer
• CPC Class Codes: G01B 9/0209 Low-coherence interferometers

Abstract

A method of imaging at least a part of an object. The method comprises splitting electro-magnetic radiation to first and second portions, propagating the first and second portions, spectrally dispersing the first portion toward the part and the second portion toward a reference element, combining between reflections of the spectrally dispersed first and second portions to produce an interference signal, capturing an image of the part from the interference, and adjusting at least one of a tilt of said image plane and a curvature of the image by changing a deviation between the phase of at least one spectral component of the first portion and the phase of at least one spectral component of the second portion.

Claims

1. A method of adjusting imaging at least a part of an object, comprising:

splitting electro-magnetic radiation to first and second portions;

propagating said first portion toward said part and said second portion toward a reference element;

spectrally diffracting said first portion using a spectral diffraction imaging element;

spectrally dispersing at least one of said first portion and said second portion using a spectral dispersion element;

combining between reflections of said spectrally diffracted first portion and said second portion to produce an interference signal;

capturing an image of the part from said interference signal; and

presenting said image to a user;

receiving from a user instructions to optimize the quality of said image;

using said spectral dispersion element to perform;

an adjustment of a second order dispersion of at least one of said first portion and said second portion to change a tilt of an image plane in the field of view of said part, or

an adjustment of a third order dispersion of at least one of said first portion and said second portion to change a curvature of said image by changing, according to said user instructions;

wherein said adjustment is made by changing a deviation between the phase of at least one spectral component of said first portion and the phase of at least one spectral component of said second portion.

2. The method of claim 1, wherein said propagating is performed in first and second mono-mode optical fibers, said reflections being propagated in said first and second mono-mode optical fibers.

3. The method of claim 2, wherein the object is an intrabody surface;

further comprising conducting said first mono-mode optical fiber in an intrabody tubular lumen so as to image said intrabody surface.

4. The method of claim 1, wherein said deviation induces a linear chirp in said interference.

16. The method of claim 1, wherein said user instructions comprise image focusing instructions.

5. An interferometric imaging device for imaging at least a part of an object, comprising:

a beam splitter which splits a coherent light to first and second portions;

a first waveguide which propagates said first portion toward an imaging spectral diffraction imaging element mounted on its tip so as to spectrally diffracting said first portion onto the part;

a second waveguide which propagates said second portion toward a reference element;

a combining element which combines between a first reflection of said first portion and a second reflection of said second portion to produce an interference signal;

a man machine interface (MMI) which presents to a user an image formed according to said interference signal and receives from said user instructions to optimize the quality of said image;

a spectral dispersion element which changes a deviation between the phase of at least one spectral component of said first portion and the phase of at least one spectral component of said second portion according to said user instructions;

to adjust;

a second order dispersion of at least one of said first portion and said second portion thereby changing at tilt of an image plane in the field of view of said part, or

a third order dispersion of at least one of said first portion and said second portion thereby changing a curvature of said image.

6. The interferometric imaging device of claim 5, wherein said spectral dispersion element is a controllable spectral dispersion element.

7. The interferometric imaging device of claim 5, wherein said object is an intrabody surface and said first waveguide and said imaging spectral dispersion element being sized and shaped for being disposed along an intrabody tubular lumen.

8. The interferometric imaging device of claim 5, further comprising a detector which captures an image of the part from said interference.

9. The interferometric imaging device of claim 5, further comprising a coherent light source of generating said coherent light.

10. The interferometric imaging device of claim 5, wherein said combining element and said beam splitter are part of a common interferometer.

11. The interferometric imaging device of claim 5, wherein said imaging spectral dispersion element is a grating slanted in relation to a longitudinal axis of the first waveguide.

12. The interferometric imaging device of claim 5, wherein said first and second waveguides are single-mode optical fibers.

13. The interferometric imaging device of claim 5, further comprising a variable neutral density (ND) filter for filtering said second portion.

14. The interferometric imaging device of claim 5, wherein said spectral dispersion element is placed to spectrally disperse said second portion.

15. An interferometric imaging device of imaging at least a part of an object, comprising:

a light transmission path arrangement which includes a beam splitter set to split electro-magnetic radiation to first and second portions and first and second waveguides for propagating said first and second portions to radiate, respectively, said part and a reference element; and

a light collection path arrangement which includes an interferometric element to interfere between first and second reflections of said first and second portions and a detector which captures an image of the part from said interfered reflections;

a man machine interface (MMI) which presents said image to a user and receives from a user instructions to optimize the quality of said image;

a spectral diffraction imaging element for spectrally diffracting said first portion; and

a spectral dispersion element which changes a deviation between the phase of at least one spectral component of said first portion and the phase of at least one spectral component of said second portion according to said user instructions to adjust;

a second order dispersion of at least one of said first portion and said second portion thereby changing a tilt of an image plane in the field of view of said part, or

a third order dispersion of at least one of said first portion and said second portion thereby changing a curvature of said image.