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 optical apparatus comprising:
a housing; and
a system of optical components disposed in the housing capable of operating in a line scanning laser ophthalmoscope (LSLO) mode and an optical coherence tomography (OCT) mode, the system of optical components including:
a lens for converting between the LSLO mode and the OCT mode, the lens movable between a first lens position and a second lens position:
in the first lens position, the lens receives a beam of light from a source and provides a line of light for scanning an object in the LSLO mode; and
in the second lens position, the lens removed from a path of the beam of light so that the source provides the beam of light for scanning the object in the OCT mode; and
a mirror for converting between the LSLO mode and the OCT mode, the mirror movable between a first mirror position and a second mirror position:
in the first position, the mirror is removed from a path of light returning from the object; and
in the second position, the mirror receives the light returning from the object.
2. The optical apparatus of claim 1 wherein the system of optical components further comprises a scanner that:
in the LSLO mode, scans, through at least one lens, a first portion of the object with the line of light in a direction perpendicular to the line, and descans light returning from the object in the LSLO line configuration; and
in the OCT mode, scans a second portion of the object with the beam of light, and redirects light returning from the object.
3. The optical apparatus of claim 2 wherein the system of optical components further comprises a one-dimensional detector that:
in the LSLO mode, receives light descanned from the object and provides an electrical signal responsive to the light descanned at each of a plurality of locations along a LSLO line configuration, the electrical signal indicative of a LSLO image of the object; and
in the OCT mode, receives light redirected by the mirror and provides an electrical signal responsive to the light redirected at each of a plurality of locations along an OCT line configuration, the electrical signal combined with a reference signal from a reference arm, the electrical signal and the reference signal associated with an OCT image of the object.
4. The optical apparatus of claim 1 wherein the system of optical components further comprises a source of the beam of light used in the LSLO mode and the OCT mode.
5. The optical apparatus of claim 1 wherein the system of optical components further comprises a grating spectrograph, used only in the OCT mode, dispersing light returning from the object into an OCT line configuration.
6. The optical apparatus of claim 1 wherein the OCT mode comprises a spectral domain OCT mode.