摘要 |
<p>An imaging optical coherence tomography (OCT) apparatus with high transverse and high axial resolution comprises an interferometer of the Michelson, Mach-Zehnder or Kösters type. Light returning in the reference beam path (27) and the object beam path (26) interferes and is detected by an image sensor (28, 45) in the detection beam path (25). A single electromechanical linear scanner displaces the plane reference mirror (34, 51), the object imaging lens (33, 50), and the reference imaging lens (35, 52) along the optical axis. By providing identical lenses in the reference beam path (27) and in the object beam path (26), the geometrical displacement of the measurement focus in the object beam path (26) is equal to the change in optical length in the reference beam path (27), thus allowing dynamic coherent focus over the full scanning distance. All optical elements that must be replaced to obtain a different optical magnification can be arranged in an exchangeable cartridge (32, 49). The OCT image sensor (45) with its limited lateral resolution may be complemented by an additional high-resolution camera (57), which is observing the object through a beam splitter or a dichroic mirror in the detection beam path.</p> |