Hybrid spectral domain optical coherence tomography line scanning laser ophthalmoscope
An apparatus for imaging an eye includes a housing and a system of optical components disposed in the housing. The apparatus is capable of operating in a line scanning laser ophthalmoscope (LSLO) mode and an optical coherence tomography (OCT) mode. The system of optical components can include a first source to provide a first beam of light for the OCT mode and a second source to provide a second beam of light for the LSLO mode. In the OCT mode, a first optic is used that (i) scans, using a first surface of the first optic, the first beam of light along a retina of an eye in a first dimension, and (ii) descans, using the first surface, a first light returning from the eye in the first dimension to a detection system in the OCT mode. In the LSLO mode, the first optic is used where the second beam of light passes through a second surface of the first optic.
1. An apparatus comprising:
a housing; and
a system of optical components disposed in the housing capable of operating in a line scanning laser opthalmoscope (LSLO) mode and an optical coherence tomography (OCT) mode, the system of optical components including:
a first source to provide a first beam of light for the OCT mode;
a second source to provide a second beam of light for the LSLO mode; and
a first optic that:
in the OCT mode, (i) scans, using a first surface of the first optic, the first beam of light along a retina of an eye in a first dimension, and (ii) descans, using the first surface, a first light returning from the eye in the first dimension to a detection system; and
in the LSLO mode, (i) passes, through a second surface of the first optic, the second beam of light to the retina of the eye.
2. The apparatus of claim 1 wherein the detection system comprises a one-dimensional detector that:
in the OCT mode, receives the first light returning from the eye in the first dimension and provides a first electrical signal responsive to the first light at each of a plurality of locations along the one-dimensional detector, the first electrical signal combined with a reference signal from a reference arm, the first electrical signal and the reference signal associated with an OCT image of the eye; and
in the LSLO mode, receives a second light returning from the eye and provides a second electrical signal responsive to the second light at each of a plurality of locations along the one-dimensional detector, the second electrical signal indicative of a LSLO image of the eye.
3. The apparatus of claim 2 wherein the system of optical components further comprises: a second optic that:
in the OCT mode, (i) scans the first beam of light along the retina in a second dimension, and (ii) descans the first light returning from the eye in the second dimension, the first light returning from the eye directed to the first surface of the first optic and to the detection system; and
in the LSLO mode, (i) scans the second beam of light, in a line focus configuration, along the retina in the second dimension, and (ii) descans the second light returning from the eye in the second dimension, the light returning from the eye directed to the first surface of the first optic and to the detection system.
4. The apparatus of claim 2 wherein the system of optical components further comprises:
a second optic that:
in the OCT mode, (i) directs, using a first surface of the second optic, the first beam of light to the first optic, (ii) redirects, using the first surface of the second optic, the first light returning from the eye scanned, and (iii) redirects, using a second surface of the second optic, the first light, dispersed by a grating, to the detection system; and
in the LSLO mode, passes the second light returning from the eye to the detection system.
5. The apparatus of claim 1 wherein the first optic comprises: a beam separator, having an aperture, that,
in the LSLO mode, redirects the second light returning from the eye to the detection system; and
a dichroic beam splitter, disposed in the aperture, that:
in the OCT mode, (i) scans, using the first surface of the dichroic beam splitter, the first beam of light along the retina of the eye in the first dimension, and (ii) descans, using the first surface, the first light returning from the eye in the first dimension to the detection system; and
in the LSLO mode, (i) passes, through the second surface of the dichroic beam splitter, the second beam of light to the retina of the eye.
6. The apparatus of claim 3 wherein the second optic comprises a scanning mirror.
7. The apparatus of claim 4 wherein the second optic comprises a dichroic beam splitter.
8. The apparatus of claim 1 wherein the housing is adapted to be handheld.
9. The apparatus of claim 1 wherein the first source and the second source are the same source of light.
10. The apparatus of claim 1 further comprising a controller, associated with the detection system, that switches the apparatus between the OCT mode and the LSLO mode.
11. The apparatus of claim 2 further comprising a controller, associated with the detection system, that interleaves acquisition of the OCT image of the eye and the LSLO image of the eye by the detection system.
12. The apparatus of claim 1 wherein the OCT mode comprises a spectral domain OCT mode.